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1. Transverse-spin-dependent azimuthal asymmetries of pion and kaon pairs produced in muon-proton and muon-deuteron semi-inclusive deep inelastic scattering

Author

G.D. Alexeev, M.G. Alexeev, C. Alice, A. Amoroso, V. Andrieux, V. Anosov, K. Augsten, W. Augustyniak, C.D.R. Azevedo, B. Badelek, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, M. Bodlak, F. Bradamante, C. Braun, A. Bressan, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, A.G. Chumakov, S.-U. Chung, A. Cicuttin, P.M.M. Correia, M.L. Crespo, D. D'Ago, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, F. Del Carro, I. Denisenko, O.Yu. Denisov, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, D. Ecker, A. Efremov, C. Elia, D. Eremeev, P. Faccioli, M. Faessler, M. Finger, M. Finger, jr., H. Fischer, K.J. Flöthner, W. Florian, J.M. Friedrich, V. Frolov, L.G. Garcia Ordòñez, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, D. Giordano, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, M. Grüner, A. Guskov, D. von Harrach, M. Hoffmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, M. Jandek, V. Jary, R. Joosten, E. Kabuß, F. Kaspar, A. Kerbizi, B. Ketzer, A. Khatun, G.V. Khaustov, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo Horikawa, I. Konorov, V.F. Konstantinov, A.M. Korzenev, A.M. Kotzinian, O.M. Kouznetsov, A. Koval, Z. Kral, F. Krinner, F. Kunne, K. Kurek, R.P. Kurjata, A. Kveton, K. Lavickova, S. Levorato, Y.-S. Lian, J. Lichtenstadt, P.-J. Lin, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, A. Maltsev, S.A. Mamon, A. Martin, J. Marzec, J. Matoušek, T. Matsuda, G. Mattson, C. Menezes Pires, F. Metzger, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, D. Miura, Y. Miyachi, R. Molina, A. Moretti, A. Nagaytsev, D. Neyret, M. Niemiec, J. Nový, W.-D. Nowak, G. Nukazuka, A.G. Olshevsky, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, H. Pekeler, J.-C. Peng, G. Pesaro, M. Pešek, D.V. Peshekhonov, M. Pešková, S. Platchkov, J. Pochodzalla, V.A. Polyakov, M. Quaresma, C. Quintans, G. Reicherz, C. Riedl, D.I. Ryabchikov, A. Rychter, A. Rymbekova, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, H. Schmieden, A. Selyunin, K. Sharko, L. Sinha, M. Slunecka, F. Sozzi, D. Spülbeck, A. Srnka, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, A. Townsend, T. Triloki, V. Tskhay, B. Valinoti, B.M. Veit, J.F.C.A. Veloso, B. Ventura, M. Virius, M. Wagner, S. Wallner, K. Zaremba, M. Zavertyaev, M. Zemko, E. Zemlyanichkina, and M. Ziembicki

Subjects
SIDIS, Di-hadron, Spin, Fragmentation, Transversity, Collins effect, Physics, QC1-999
Abstract

A set of measurements of azimuthal asymmetries in the production of pairs of identified hadrons in deep-inelastic scattering of muons on transversely polarised 6LiD (deuteron) and NH3 (proton) targets is presented. All available data collected in the years 2003–2004 and 2007/2010 with the COMPASS spectrometer using a muon beam of 160GeV/c at the CERN SPS were analysed. The asymmetries provide access to the transversity distribution functions via a fragmentation function that in principle may be independently obtained from e+e− annihilation data. Results are presented, discussed and compared to existing measurements as well as to model predictions. Asymmetries of π+π− pairs measured with the proton target as a function of the Bjorken scaling variable are sizeable in the range x>0.032, indicating non-vanishing transversity distribution and di-hadron interference fragmentation functions. As already pointed out by several authors, the small asymmetries of π+π− measured on the 6LiD target can be interpreted as indication for a cancellation of u and d-quark transversity distributions.

Published
2023
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2. Collins and Sivers transverse-spin asymmetries in inclusive muoproduction of ρ0 mesons

Author

G.D. Alexeev, M.G. Alexeev, C. Alice, A. Amoroso, V. Andrieux, V. Anosov, K. Augsten, W. Augustyniak, C.D.R. Azevedo, B. Badelek, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, M. Bodlak, F. Bradamante, A. Bressan, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, A.G. Chumakov, S.-U. Chung, A. Cicuttin, P.M.M. Correia, M.L. Crespo, D. D'Ago, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, F. Del Carro, I. Denisenko, O.Yu. Denisov, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, D. Ecker, A. Efremov, C. Elia, D. Eremeev, P. Faccioli, M. Faessler, M. Finger, M. Finger, jr., H. Fischer, K.J. Flöthner, W. Florian, J.M. Friedrich, V. Frolov, L.G. Garcia Ordòñez, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, D. Giordano, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, M. Grüner, A. Guskov, D. von Harrach, M. Hoffmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, M. Jandek, V. Jary, R. Joosten, E. Kabuß, F. Kaspar, A. Kerbizi, B. Ketzer, A. Khatun, G.V. Khaustov, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo Horikawa, I. Konorov, V.F. Konstantinov, A.M. Korzenev, A.M. Kotzinian, O.M. Kouznetsov, A. Koval, Z. Kral, F. Krinner, F. Kunne, K. Kurek, R.P. Kurjata, A. Kveton, K. Lavickova, S. Levorato, Y.-S. Lian, J. Lichtenstadt, P.-J. Lin, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, A. Maltsev, S.A. Mamon, A. Martin, J. Marzec, J. Matoušek, T. Matsuda, G. Mattson, C. Menezes Pires, F. Metzger, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, D. Miura, Y. Miyachi, R. Molina, A. Moretti, A. Nagaytsev, C. Naim, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.G. Olshevsky, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, H. Pekeler, J.-C. Peng, M. Pešek, D.V. Peshekhonov, M. Pešková, S. Platchkov, J. Pochodzalla, V.A. Polyakov, M. Quaresma, C. Quintans, G. Reicherz, C. Riedl, T. Rudnicki, D.I. Ryabchikov, A. Rychter, A. Rymbekova, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, H. Schmieden, A. Selyunin, K. Sharko, L. Sinha, M. Slunecka, F. Sozzi, D. Spülbeck, A. Srnka, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, A. Townsend, T. Triloki, V. Tskhay, B. Valinoti, B.M. Veit, J.F.C.A. Veloso, B. Ventura, M. Virius, M. Wagner, S. Wallner, K. Zaremba, M. Zavertyaev, M. Zemko, E. Zemlyanichkina, and M. Ziembicki

Subjects
SIDIS, Spin, Fragmentation, Collins asymmetry, Sivers asymmetry, Physics, QC1-999
Abstract

The production of vector mesons in deep inelastic scattering is an interesting yet scarcely explored channel to study the transverse spin structure of the nucleon and the spin-dependence of fragmentation. The COMPASS collaboration has performed the first measurement of the Collins and Sivers asymmetries for inclusively produced ρ0 mesons. The analysis is based on the data set collected in deep inelastic scattering in 2010 using a 160GeV/c μ+ beam impinging on a transversely polarized NH3 target. The ρ0 mesons are selected from oppositely charged hadron pairs, and the asymmetries are extracted as a function of the Bjorken-x variable, the transverse momentum of the pair and the fraction of the energy z carried by the pair. Indications for positive Collins and Sivers asymmetries are observed.

Published
2023
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3. Double J/ψ production in pion-nucleon scattering at COMPASS

Author

G.D. Alexeev, M.G. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, K. Augsten, W. Augustyniak, C.D.R. Azevedo, B. Badełek, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, M. Bodlak, F. Bradamante, A. Bressan, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, A.G. Chumakov, S.-U. Chung, A. Cicuttin, P.M.M. Correia, M.L. Crespo, D. D'Ago, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, I. Denisenko, O.Yu. Denisov, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, D. Ecker, A. Efremov, D. Eremeev, P.D. Eversheim, P. Faccioli, M. Faessler, M. Finger, M. Finger, jr., H. Fischer, K.J. Flöthner, W. Florian, C. Franco, J.M. Friedrich, V. Frolov, L.G. Garcia Ordòñez, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, D. Giordano, M. Gorzellik, A. Grasso, A. Gridin, S. Groote, M. Grosse Perdekamp, B. Grube, M. Grüner, A. Guskov, D. von Harrach, M. Hoffmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, M. Jandek, V. Jary, R. Joosten, E. Kabuß, F. Kaspar, A. Kerbizi, B. Ketzer, A. Khatun, G.V. Khaustov, Yu.A. Khokhlov, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo Horikawa, I. Konorov, V.F. Konstantinov, A.M. Korzenev, S. Koshkarev, A.M. Kotzinian, O.M. Kouznetsov, A. Koval, Z. Kral, F. Krinner, F. Kunne, K. Kurek, R.P. Kurjata, A. Kveton, K. Lavickova, S. Levorato, Y.-S. Lian, J. Lichtenstadt, P.-J. Lin, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, A. Maltsev, S.A. Mamon, A. Martin, J. Marzec, J. Matoušek, T. Matsuda, G. Mattson, C. Menezes Pires, F. Metzger, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, Y. Miyachi, R. Molina, A. Moretti, A. Nagaytsev, C. Naim, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.G. Olshevsky, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, H. Pekeler, J.-C. Peng, M. Pešek, D.V. Peshekhonov, M. Pešková, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, G. Reicherz, C. Riedl, T. Rudnicki, D.I. Ryabchikov, A. Rychter, A. Rymbekova, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, H. Schmieden, A. Selyunin, K. Sharko, L. Sinha, M. Slunecka, D. Spülbeck, A. Srnka, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, A. Townsend, T. Triloki, V. Tskhay, B. Valinoti, B.M. Veit, J.F.C.A. Veloso, B. Ventura, M. Virius, M. Wagner, S. Wallner, K. Zaremba, M. Zavertyaev, M. Zemko, E. Zemlyanichkina, and M. Ziembicki

Subjects
COMPASS, Charmonia production, Double J/ψ, Single parton scattering, Intrinsic charm, Physics, QC1-999
Abstract

We present the study of the production of double J/ψ mesons using COMPASS data collected with a 190 GeV/c π− beam scattering off NH3, Al and W targets. Kinematic distributions of the collected double J/ψ events are analysed, and the double J/ψ production cross section is estimated for each of the COMPASS targets. The NH3 results are compared to predictions from single- and double-parton scattering models as well as the pion intrinsic charm and the tetraquark exotic resonance hypotheses. It is demonstrated that the single parton scattering production mechanism gives the dominant contribution that is sufficient to describe the data. An upper limit on the double intrinsic charm content of the pion is evaluated. No significant signatures that could be associated with exotic tetraquarks are found in the double J/ψ mass spectrum.

Published
2023
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4. Probing transversity by measuring Λ polarisation in SIDIS

Author

G.D. Alexeev, M.G. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, K. Augsten, W. Augustyniak, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Berenguer Antequera, J. Bernhard, M. Bodlak, F. Bradamante, A. Bressan, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, A.G. Chumakov, S.-U. Chung, A. Cicuttin, P.M.M. Correia, M.L. Crespo, D. D'Ago, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, I. Denisenko, O.Yu. Denisov, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, A. Efremov, C. Elia, D. Eremeev, P.D. Eversheim, P. Faccioli, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, K.J. Flöthner, C. Franco, J.M. Friedrich, V. Frolov, L.G. Garcia Ordòñez, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, D. Giordano, I. Gnesi, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, A. Guskov, D. von Harrach, R. Heitz, M. Hoffmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, M. Jandek, V. Jary, R. Joosten, E. Kabuß, D.-H. Kang, F. Kaspar, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo Horikawa, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, A. Koval, Z. Kral, F. Krinner, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A. Kveton, K. Lavickova, S. Levorato, Y.-S. Lian, J. Lichtenstadt, P.-J. Lin, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, A. Maltsev, S.A. Mamon, B. Marianski, A. Martin, J. Marzec, J. Matoušek, T. Matsuda, G. Mattson, G.V. Meshcheryakov, F. Metzger, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, Y. Miyachi, A. Moretti, A. Nagaytsev, C. Naim, T.S. Negrini, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, H. Pekeler, J.-C. Peng, M. Pešek, D.V. Peshekhonov, M. Pešková, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, G. Reicherz, C. Riedl, T. Rudnicki, D.I. Ryabchikov, A. Rychter, A. Rymbekova, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, H. Schmieden, A. Selyunin, K. Sharko, L. Sinha, M. Slunecka, J. Smolik, F. Sozzi, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, P. Sznajder, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, A. Townsend, V. Tskhay, S. Uhl, B.I. Vasilishin, A. Vauth, B.M. Veit, J. Veloso, B. Ventura, A. Vidon, M. Virius, M. Wagner, S. Wallner, K. Zaremba, P. Zavada, M. Zavertyaev, M. Zemko, E. Zemlyanichkina, Y. Zhao, and M. Ziembicki

Subjects
Quantum chromodynamics, Deep inelastic scattering, Lambda polarisation, Transversity, COMPASS, Physics, QC1-999
Abstract

Based on the observation of sizeable target-transverse-spin asymmetries in single-hadron and hadron-pair production in Semi-Inclusive measurements of Deep Inelastic Scattering (SIDIS), the chiral-odd transversity quark distribution functions h1q are nowadays well established. Several possible channels to access these functions were originally proposed. One candidate is the measurement of the polarisation of Λ hyperons produced in SIDIS off transversely polarised nucleons, where the transverse polarisation of the struck quark might be transferred to the final-state hyperon. In this article, we present the COMPASS results on the transversity-induced polarisation of Λ and Λ¯ hyperons produced in SIDIS off transversely polarised protons. Within the experimental uncertainties, no significant deviation from zero was observed. The results are discussed in the context of different models taking into account previous experimental results on h1u and h1d.

Published
2022
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5. Transverse extension of partons in the proton probed in the sea-quark range by measuring the DVCS cross section

Author

R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, M. Bodlak, P. Bordalo, F. Bradamante, A. Bressan, M. Büchele, E. Burtin, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, I. Choi, A.G. Chumakov, S.-U. Chung, A. Cicuttin, M.L. Crespo, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, M. Dziewiecki, A. Efremov, P.D. Eversheim, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, I. Gnesi, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, D. Hahne, G. Hamar, D. von Harrach, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, V. Jary, R. Joosten, P. Jörg, K. Juraskova, E. Kabuß, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, Z. Kral, M. Krämer, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, I.I. Kuznetsov, A. Kveton, A.A. Lednev, E.A. Levchenko, M. Levillain, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, S.A. Mamon, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Moretti, A. Nagaytsev, F. Nerling, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, M. Pešková, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, N.S. Rogacheva, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, H. Schmieden, K. Schönning, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, M. Tasevsky, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, V. Tskhay, S. Uhl, B.I. Vasilishin, A. Vauth, B.M. Veit, J. Veloso, A. Vidon, M. Virius, S. Wallner, M. Wilfert, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, and M. Ziembicki

Subjects
Physics, QC1-999
Abstract

We report on the first measurement of exclusive single-photon muoproduction on the proton by COMPASS using 160GeV/c polarised μ+ and μ− beams of the CERN SPS impinging on a liquid hydrogen target. We determine the dependence of the average of the measured μ+ and μ− cross sections for deeply virtual Compton scattering on the squared four-momentum transfer t from the initial to the final proton. The slope B of the t-dependence is fitted with a single exponential function, which yields B=(4.3±0.6stat|sys−0.3+0.1)(GeV/c)−2. This result can be converted into a transverse extension of partons in the proton, 〈r⊥2〉=(0.58±0.04stat|sys−0.02+0.01±0.04model)fm. For this measurement, the average virtuality of the photon mediating the interaction is 〈Q2〉=1.8(GeV/c)2 and the average value of the Bjorken variable is 〈xBj〉=0.056. Keywords: Quantum chromodynamics, Deep inelastic scattering, Exclusive reactions, Deeply virtual Compton scattering, Generalized Parton Distributions, Proton size, COMPASS

Published
2019
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6. Measurement of PT-weighted Sivers asymmetries in leptoproduction of hadrons

Author

M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, V. Barone, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, M. Bodlak, P. Bordalo, F. Bradamante, A. Bressan, M. Büchele, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, A.G. Chumakov, S.-U. Chung, A. Cicuttin, M.L. Crespo, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, I. Gnesi, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, A. Guskov, D. Hahne, G. Hamar, D. von Harrach, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, M. Jandek, V. Jary, R. Joosten, P. Jörg, K. Juraskova, E. Kabuß, F. Kaspar, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, Z. Kral, M. Krämer, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A. Kveton, A.A. Lednev, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, S.A. Mamon, B. Marianski, A. Martin, J. Marzec, J. Matoušek, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Moretti, A. Nagaytsev, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, M. Pešková, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, H. Schmieden, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, F. Sozzi, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, M. Tasevsky, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, V. Tskhay, S. Uhl, B.I. Vasilishin, A. Vauth, B.M. Veit, J. Veloso, A. Vidon, M. Virius, M. Wagner, S. Wallner, M. Wilfert, K. Zaremba, P. Zavada, M. Zavertyaev, Y. Zhao, E. Zemlyanichkina, and M. Ziembicki

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

The transverse spin asymmetries measured in semi-inclusive leptoproduction of hadrons, when weighted with the hadron transverse momentum PT, allow for the extraction of important transverse-momentum-dependent distribution functions. In particular, the weighted Sivers asymmetries provide direct information on the Sivers function, which is a leading-twist distribution that arises from a correlation between the transverse momentum of an unpolarised quark in a transversely polarised nucleon and the spin of the nucleon. Using the high-statistics data collected by the COMPASS Collaboration in 2010 with a transversely polarised proton target, we have evaluated two types of PT-weighted Sivers asymmetries, which are both proportional to the product of the first transverse moment of the Sivers function and of the fragmentation function. The results are compared to the standard unweighted Sivers asymmetries and used to extract the first transverse moments of the Sivers distributions for u and d quarks.

Published
2019
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7. K− over K+ multiplicity ratio for kaons produced in DIS with a large fraction of the virtual-photon energy

Author

R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, M. Bodlak, P. Bordalo, F. Bradamante, A. Bressan, M. Büchele, V.E. Burtsev, L. Capozza, W.-C. Chang, C. Chatterjee, M. Chiosso, A.G. Chumakov, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, M. Dziewiecki, A. Efremov, P.D. Eversheim, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, I. Gnesi, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, A. Guskov, D. Hahne, G. Hamar, D. von Harrach, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, V. Jary, R. Joosten, P. Jörg, E. Kabuß, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, Z. Kral, M. Krämer, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, I.I. Kuznetsov, A. Kveton, A.A. Lednev, E.A. Levchenko, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, S.A. Mamon, C. Marchand, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Moretti, A. Nagaytsev, F. Nerling, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, G. Pesaro, M. Pešek, M. Pešková, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, H. Schmieden, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, F. Sozzi, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, M. Tasevsky, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, V. Tskhay, S. Uhl, B.I. Vasilishin, A. Vauth, B.M. Veit, J. Veloso, A. Vidon, M. Virius, S. Wallner, M. Wilfert, R. Windmolders, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, and M. Ziembicki

Subjects
Physics, QC1-999
Abstract

The K− over K+ multiplicity ratio is measured in deep-inelastic scattering, for the first time for kaons carrying a large fraction z of the virtual-photon energy. The data were obtained by the COMPASS collaboration using a 160 GeV muon beam and an isoscalar 6LiD target. The regime of deep-inelastic scattering is ensured by requiring Q2>1(GeV/c)2 for the photon virtuality and W>5GeV/c2 for the invariant mass of the produced hadronic system. Kaons are identified in the momentum range from 12 GeV/c to 40 GeV/c, thereby restricting the range in Bjorken-x to 0.010.75. For very large values of z, i.e. z>0.8, we observe the kaon multiplicity ratio to fall below the lower limits expected from calculations based on leading and next-to-leading order perturbative quantum chromodynamics. Also, the kaon multiplicity ratio shows a strong dependence on the missing mass of the single-kaon production process. This suggests that within the perturbative quantum chromodynamics formalism an additional correction may be required, which takes into account the phase space available for hadronisation.

Published
2018
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8. Corrigendum to 'Odd and even partial waves of ηπ− and η′π− in π−p → η(′)π−p at 191 GeV/c' [Phys. Lett. B 740 (2015) 303–311]

Author

C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, K. Bicker, E.R. Bielert, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Jörg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, M. Mikhasenko, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, J. Novy, W.-D. Nowak, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, E. Rocco, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Virius, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink

Subjects
Physics, QC1-999
Abstract

In Fig. 5 on p. 311 of our Phys. Lett. B 740 (2015) 303 an adjustment by 180∘ is required for the phases with respect to the L=2,M=1 wave, of the following waves: L=1,3,5 with M=1, and L=2 with M=2. After this correction (Fig. 5 (corrected) below), the extracted partial waves describe the angular distribution of the η(′) in the Gottfried-Jackson (GJ) frame, using Eq. (4) with implicit Condon-Shortley phase convention. The other results of our paper are not affected. The right-handed GJ coordinate system was defined by the z-axis pointing in the direction of the beam in the η(′)π− center-of-mass system and the y-axis pointing in the direction of precoilGJ×pbeamGJ.

Published
2020
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9. Antiproton over proton and K− over K+ multiplicity ratios at high z in DIS

Author

G.D. Alexeev, M.G. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Berenguer Antequera, J. Bernhard, M. Bodlak, F. Bradamante, A. Bressan, M. Büchele, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, A.G. Chumakov, S.-U. Chung, A. Cicuttin, P.M.M. Correia, M.L. Crespo, D. D'Ago, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, I. Denisenko, O.Yu. Denisov, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, A. Efremov, P.D. Eversheim, P. Faccioli, M. Faessler, M. Finger, M. Finger, jr., H. Fischer, C. Franco, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, I. Gnesi, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, A. Guskov, D. von Harrach, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, M. Jandek, V. Jary, R. Joosten, P. Jörg, E. Kabuß, F. Kaspar, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo Horikawa, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, A. Koval, Z. Kral, F. Krinner, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A. Kveton, K. Lavičková, S. Levorato, Y.-S. Lian, J. Lichtenstadt, P.-J. Lin, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, A. Maltsev, S.A. Mamon, B. Marianski, A. Martin, J. Marzec, J. Matoušek, T. Matsuda, G. Mattson, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Moretti, A. Nagaytsev, C. Naim, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, H. Pekeler, J.-C. Peng, M. Pešek, D.V. Peshekhonov, M. Pešková, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, G. Reicherz, C. Riedl, T. Rudnicki, D.I. Ryabchikov, A. Rybnikov, A. Rychter, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, H. Schmieden, A. Selyunin, L. Sinha, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, P. Sznajder, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, A. Townsend, V. Tskhay, S. Uhl, B.I. Vasilishin, A. Vauth, B.M. Veit, J. Veloso, B. Ventura, A. Vidon, M. Virius, M. Wagner, S. Wallner, K. Zaremba, P. Zavada, M. Zavertyaev, M. Zemko, E. Zemlyanichkina, Y. Zhao, and M. Ziembicki

Subjects
Quantum chromodynamics, pQCD, Deep-inelastic scattering, Hadron multiplicities, COMPASS, Physics, QC1-999
Abstract

The antiparticle-over-particle multiplicity ratio is measured in deep-inelastic scattering for negatively and positively charged kaons and, for the first time, for antiprotons and protons. The data were obtained by the COMPASS Collaboration using a 160 GeV muon beam impinging on an isoscalar 6LiD target. The regime of deep-inelastic scattering is ensured by requiring Q2 > 1 (GeV/c)2 for the photon virtuality and W>5 GeV/c2 for the invariant mass of the produced hadronic system. Bjorken-x is restricted to the range 0.01 to 0.40. Protons and antiprotons are identified in the momentum range from 20 GeV/c to 60 GeV/c and required to carry a large fraction of the virtual-photon energy, z>0.5. In the whole studied z-region, the p¯ over p multiplicity ratio is found to be below the lower limit expected from calculations based on leading-order perturbative Quantum Chromodynamics (pQCD). Kaons were previously analysed in the momentum range 12 GeV/c to 40 GeV/c. In the present analysis this range is extended up to 55 GeV/c, whereby events with larger virtual-photon energies are included in the analysis and the observed K− over K+ ratio becomes closer to the expectation of next-to-leading order pQCD. The results of both analyses strengthen our earlier conclusion that at COMPASS energies the phase space available for single-hadron production in deep-inelastic scattering should be taken into account in the standard pQCD formalism.

Published
2020
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10. Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS

Author

J. Agarwala, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Berenguer Antequera, J. Bernhard, M. Bodlak, P. Bordalo, F. Bradamante, A. Bressan, M. Büchele, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, A.G. Chumakov, S.-U. Chung, A. Cicuttin, P.M.M. Correia, M.L. Crespo, D. D'Ago, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, I. Denisenko, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, A. Efremov, P.D. Eversheim, M. Faessler, A. Ferrero, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, I. Gnesi, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, A. Guskov, D. von Harrach, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, M. Jandek, V. Jary, R. Joosten, P. Jörg, E. Kabuß, F. Kaspar, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo Horikawa, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, A. Koval, Z. Kral, F. Krinner, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A. Kveton, K. Lavickova, S. Levorato, Y.-S. Lian, J. Lichtenstadt, P.-J. Lin, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, A. Maltsev, S.A. Mamon, B. Marianski, A. Martin, J. Marzec, J. Matoušek, T. Matsuda, G. Mattson, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Moretti, A. Nagaytsev, C. Naim, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, H. Pekeler, J.-C. Peng, F. Pereira, M. Pešek, D.V. Peshekhonov, M. Pešková, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, G. Reicherz, C. Riedl, T. Rudnicki, D.I. Ryabchikov, A. Rybnikov, A. Rychter, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, H. Schmieden, A. Selyunin, L. Sinha, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, P. Sznajder, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, A. Townsend, V. Tskhay, S. Uhl, B.I. Vasilishin, A. Vauth, B.M. Veit, J. Veloso, B. Ventura, A. Vidon, M. Virius, M. Wagner, S. Wallner, M. Wilfert, K. Zaremba, P. Zavada, M. Zavertyaev, M. Zemko, E. Zemlyanichkina, Y. Zhao, and M. Ziembicki

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Hadron leptoproduction in Semi-Inclusive measurements of Deep-Inelastic Scattering (SIDIS) on unpolarised nucleons allows one to get information on the intrinsic transverse momentum of quarks in a nucleon and on the Boer-Mulders function through the measurement of azimuthal modulations in the cross section. These modulations were recently measured by the HERMES experiment at DESY on proton and deuteron targets, and by the COMPASS experiment using the CERN SPS muon beam and a 6LiD target. In both cases, the amplitudes of the cos⁡ϕh and cos⁡2ϕh modulations show strong kinematic dependences for both positive and negative hadrons. It has been known since some time that the measured final-state hadrons in those SIDIS experiments receive a contribution from exclusive diffractive production of vector mesons, particularly important at large values of z, the fraction of the virtual photon energy carried by the hadron. In previous measurements of azimuthal asymmetries this contribution was not taken into account, because it was not known that it could distort the azimuthal modulations. Presently, a method to evaluate the contribution of the exclusive reactions to the azimuthal asymmetries measured by COMPASS has been developed. The subtraction of this contribution results in a better understanding of the kinematic effects, and the remaining non-zero cos⁡2ϕh modulation gives indication for a non-zero Boer-Mulders effect.

Published
2020
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11. Measurement of the cross section for hard exclusive π0 muoproduction on the proton

Author

M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, M. Bodlak, P. Bordalo, F. Bradamante, A. Bressan, M. Büchele, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, A.G. Chumakov, S.-U. Chung, A. Cicuttin, M.L. Crespo, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, A. Efremov, P.D. Eversheim, M. Faessler, A. Ferrero, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, I. Gnesi, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, A. Guskov, D. Hahne, G. Hamar, D. von Harrach, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, M. Jandek, V. Jary, R. Joosten, P. Jörg, K. Juraskova, E. Kabuß, F. Kaspar, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo Horikawa, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, Z. Kral, M. Krämer, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A. Kveton, S. Levorato, Y.-S. Lian, J. Lichtenstadt, P.-J. Lin, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, S.A. Mamon, B. Marianski, A. Martin, J. Marzec, J. Matoušek, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Moretti, C. Naim, A. Nagaytsev, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, D.V. Peshekhonov, M. Pešková, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, D.I. Ryabchikov, A. Rybnikov, A. Rychter, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, H. Schmieden, A. Selyunin, L. Silva, L. Sinha, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, V. Tskhay, S. Uhl, B.I. Vasilishin, A. Vauth, B.M. Veit, J. Veloso, A. Vidon, M. Virius, M. Wagner, S. Wallner, M. Wilfert, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, Y. Zhao, and M. Ziembicki

Subjects
Quantum chromodynamics, Muoproduction, Hard exclusive meson production, Generalised Parton Distributions, COMPASS, Physics, QC1-999
Abstract

We report on a measurement of hard exclusive π0 muoproduction on the proton by COMPASS using 160GeV/c polarised μ+ and μ− beams of the CERN SPS impinging on a liquid hydrogen target. From the average of the measured μ+ and μ− cross sections, the virtual-photon proton cross section is determined as a function of the squared four-momentum transfer between initial and final proton in the range 0.08(GeV/c)2

Published
2020
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12. Longitudinal double-spin asymmetry A1p and spin-dependent structure function g1p of the proton at small values of x and Q2

Author

M. Aghasyan, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, M. Bodlak, P. Bordalo, F. Bradamante, A. Bressan, M. Büchele, V.E. Burtsev, L. Capozza, W.-C. Chang, C. Chatterjee, M. Chiosso, I. Choi, A.G. Chumakov, S.-U. Chung, A. Cicuttin, M.L. Crespo, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, M. Dziewiecki, A. Efremov, P.D. Eversheim, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, F. Giordano, I. Gnesi, M. Gorzellik, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, D. Hahne, G. Hamar, D. von Harrach, F.H. Heinsius, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, V. Jary, R. Joosten, P. Jörg, E. Kabuß, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, Z. Kral, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, I.I. Kuznetsov, A. Kveton, A.A. Lednev, E.A. Levchenko, M. Levillain, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, S.A. Mamon, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Moretti, A. Nagaytsev, F. Nerling, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, M. Pešková, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, N.S. Rogacheva, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, M. Tasevsky, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, V. Tskhay, S. Uhl, B.I. Vasilishin, A. Vauth, J. Veloso, A. Vidon, M. Virius, S. Wallner, T. Weisrock, M. Wilfert, R. Windmolders, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, and M. Ziembicki

Subjects
Physics, QC1-999
Abstract

We present a precise measurement of the proton longitudinal double-spin asymmetry A1p and the proton spin-dependent structure function g1p at photon virtualities 0.006(GeV/c)2

Published
2018
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13. New analysis of ηπ tensor resonances measured at the COMPASS experiment

Author

A. Jackura, C. Fernández-Ramírez, M. Mikhasenko, A. Pilloni, V. Mathieu, J. Nys, V. Pauk, A.P. Szczepaniak, G. Fox, M. Aghasyan, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, M. Bodlak, P. Bordalo, F. Bradamante, A. Bressan, M. Büchele, V.E. Burtsev, W.-C. Chang, C. Chatterjee, M. Chiosso, I. Choi, A.G. Chumakov, S.-U. Chung, A. Cicuttin, M.L. Crespo, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R.R. Dusaev, M. Dziewiecki, A. Efremov, P.D. Eversheim, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, F. Giordano, I. Gnesi, M. Gorzellik, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, D. Hahne, G. Hamar, D. von Harrach, F.H. Heinsius, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, V. Jary, R. Joosten, P. Jörg, E. Kabuß, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, Z. Kral, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, I.I. Kuznetsov, A. Kveton, A.A. Lednev, E.A. Levchenko, M. Levillain, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, V.E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, S.A. Mamon, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Nagaytsev, F. Nerling, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, M. Pešková, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, N.S. Rogacheva, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, T. Schlüter, K. Schmidt, H. Schmieden, K. Schönning, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, M. Tasevsky, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, V. Tskhay, S. Uhl, B.I. Vasilishin, A. Vauth, J. Veloso, A. Vidon, M. Virius, S. Wallner, T. Weisrock, M. Wilfert, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, and M. Ziembicki

Subjects
Physics, QC1-999
Abstract

We present a new amplitude analysis of the ηπ D-wave in the reaction π−p→ηπ−p measured by COMPASS. Employing an analytical model based on the principles of the relativistic S-matrix, we find two resonances that can be identified with the a2(1320) and the excited a2′(1700), and perform a comprehensive analysis of their pole positions. For the mass and width of the a2 we find M=(1307±1±6) MeV and Γ=(112±1±8) MeV, and for the excited state a2′ we obtain M=(1720±10±60) MeV and Γ=(280±10±70) MeV, respectively.

Published
2018
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14. First measurement of the Sivers asymmetry for gluons using SIDIS data

Author

C. Adolph, M. Aghasyan, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, M. Bodlak, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, W.-C. Chang, C. Chatterjee, M. Chiosso, I. Choi, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, G. Hamar, D. von Harrach, F.H. Heinsius, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, V. Jary, R. Joosten, P. Jörg, E. Kabuß, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Nagaytsev, F. Nerling, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, M. Roskot, N.S. Rogacheva, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, M. Tasevsky, S. Tessaro, F. Tessarotto, F. Thibaud, A. Thiel, F. Tosello, V. Tskhay, S. Uhl, A. Vauth, J. Veloso, M. Virius, J. Vondra, S. Wallner, T. Weisrock, M. Wilfert, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, M. Ziembicki, and A. Zink

Subjects
Deep inelastic scattering, Gluon, Sivers, TMD, PDF, Physics, QC1-999
Abstract

The Sivers function describes the correlation between the transverse spin of a nucleon and the transverse motion of its partons. For quarks, it was studied in previous measurements of the azimuthal asymmetry of hadrons produced in semi-inclusive deep inelastic scattering of leptons off transversely polarised nucleon targets, and it was found to be non-zero. In this letter the evaluation of the Sivers asymmetry for gluons is presented. The contribution of the photon–gluon fusion subprocess is enhanced by requiring two high transverse-momentum hadrons. The analysis method is based on a Monte Carlo simulation that includes three hard processes: photon–gluon fusion, QCD Compton scattering and the leading-order virtual-photon absorption process. The Sivers asymmetries of the three processes are simultaneously extracted using the LEPTO event generator and a neural network approach. The method is applied to samples of events containing at least two hadrons with large transverse momentum from the COMPASS data taken with a 160 GeV/c muon beam scattered off transversely polarised deuterons and protons. With a significance of about two standard deviations, a negative value is obtained for the gluon Sivers asymmetry. The result of a similar analysis for a Collins-like asymmetry for gluons is consistent with zero.

Published
2017
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15. Sivers asymmetry extracted in SIDIS at the hard scales of the Drell–Yan process at COMPASS

Author

C. Adolph, M. Aghasyan, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, M. Bodlak, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, W.-C. Chang, C. Chatterjee, M. Chiosso, I. Choi, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, G. Hamar, D. von Harrach, F.H. Heinsius, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, V. Jary, R. Joosten, P. Jörg, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Nagaytsev, F. Nerling, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, M. Roskot, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, M. Tasevsky, S. Tessaro, F. Tessarotto, F. Thibaud, A. Thiel, F. Tosello, V. Tskhay, S. Uhl, J. Veloso, M. Virius, J. Vondra, S. Wallner, T. Weisrock, M. Wilfert, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, M. Ziembicki, and A. Zink

Subjects
SIDIS, Drell–Yan, Spin, Azimuthal asymmetries, Sivers, TMDs, Physics, QC1-999
Abstract

Eight proton transverse-spin-dependent azimuthal asymmetries are extracted in four regions of the photon virtuality Q2 from the COMPASS 2010 semi-inclusive hadron measurements in deep inelastic muon–nucleon scattering. These Q2 regions correspond to the four regions of the di-muon mass Q2 used in the ongoing analyses of the COMPASS Drell–Yan measurements, which allows for a future direct comparison of the nucleon transverse-momentum-dependent parton distribution functions extracted from these two alternative measurements. In addition, for the azimuthal asymmetries induced by the Sivers transverse-momentum-dependent parton distribution function various two-dimensional kinematic dependences are presented. The integrated Sivers asymmetries are found to be positive with an accuracy that appears to be sufficient to test the sign change of the Sivers function predicted by Quantum Chromodynamics.

Published
2017
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16. Final COMPASS results on the deuteron spin-dependent structure function g1d and the Bjorken sum rule

Author

C. Adolph, M. Aghasyan, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, M. Bodlak, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, W.-C. Chang, C. Chatterjee, M. Chiosso, I. Choi, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, G. Hamar, D. von Harrach, F.H. Heinsius, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, V. Jary, R. Joosten, P. Jörg, E. Kabuß, A. Kerbizi, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Nagaytsev, F. Nerling, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, M. Roskot, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, M. Tasevsky, S. Tessaro, F. Tessarotto, F. Thibaud, A. Thiel, F. Tosello, V. Tskhay, S. Uhl, A. Vauth, J. Veloso, M. Virius, J. Vondra, S. Wallner, T. Weisrock, M. Wilfert, R. Windmolders, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, M. Ziembicki, and A. Zink

Subjects
COMPASS, Deep inelastic scattering, Spin, Structure function, Parton helicity distributions, Physics, QC1-999
Abstract

Final results are presented from the inclusive measurement of deep-inelastic polarised-muon scattering on longitudinally polarised deuterons using a 6LiD target. The data were taken at 160 GeV beam energy and the results are shown for the kinematic range 1(GeV/c)24GeV/c2 in the mass of the hadronic final state. The deuteron double-spin asymmetry A1d and the deuteron longitudinal-spin structure function g1d are presented in bins of x and Q2. Towards lowest accessible values of x, g1d decreases and becomes consistent with zero within uncertainties. The presented final g1d values together with the recently published final g1p values of COMPASS are used to again evaluate the Bjorken sum rule and perform the QCD fit to the g1 world data at next-to-leading order of the strong coupling constant. In both cases, changes in central values of the resulting numbers are well within statistical uncertainties. The flavour-singlet axial charge a0, which is identified in the MS‾ renormalisation scheme with the total contribution of quark helicities to the nucleon spin, is extracted at next-to-leading order accuracy from only the COMPASS deuteron data: a0(Q2=3(GeV/c)2)=0.32±0.02stat±0.04syst±0.05evol. Together with the recent results on the proton spin structure function g1p, the results on g1d constitute the COMPASS legacy on the measurements of g1 through inclusive spin-dependent deep inelastic scattering.

Published
2017
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17. Multiplicities of charged kaons from deep-inelastic muon scattering off an isoscalar target

Author

C. Adolph, M. Aghasyan, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, M. Bodlak, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, L. Capozza, W.-C. Chang, C. Chatterjee, M. Chiosso, I. Choi, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, Ch. Dreisbach, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, G. Hamar, D. von Harrach, F.H. Heinsius, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, V. Jary, R. Joosten, P. Jörg, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Nagaytsev, F. Nerling, D. Neyret, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, M. Roskot, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, E. Seder, A. Selyunin, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, F. Sozzi, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, M. Tasevsky, S. Tessaro, F. Tessarotto, F. Thibaud, A. Thiel, F. Tosello, V. Tskhay, S. Uhl, J. Veloso, M. Virius, J. Vondra, S. Wallner, T. Weisrock, M. Wilfert, R. Windmolders, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, M. Ziembicki, and A. Zink

Subjects
Deep inelastic scattering, Kaon multiplicities, Quark fragmentation functions, Strange quark, Physics, QC1-999
Abstract

Precise measurements of charged-kaon multiplicities in deep inelastic scattering were performed. The results are presented in three-dimensional bins of the Bjorken scaling variable x, the relative virtual-photon energy y, and the fraction z of the virtual-photon energy carried by the produced hadron. The data were obtained by the COMPASS Collaboration by scattering 160 GeV muons off an isoscalar 6LiD target. They cover the kinematic domain 1(GeV/c)25 GeV/c2 in the invariant mass of the hadronic system. The results from the sum of the z-integrated K+ and K− multiplicities at high x point to a value of the non-strange quark fragmentation function larger than obtained by the earlier DSS fit.

Published
2017
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18. Exclusive ω meson muoproduction on transversely polarised protons

Author

C. Adolph, M. Aghasyan, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, W.-C. Chang, C. Chatterjee, M. Chiosso, I. Choi, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, D. von Harrach, R. Hashimoto, F.H. Heinsius, R. Heitz, F. Herrmann, F. Hinterberger, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, R. Joosten, P. Jörg, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, C. Marchand, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, T. Michigami, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, P. Montuenga, A. Nagaytsev, F. Nerling, D. Neyret, V.I. Nikolaenko, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, M. Roskot, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, E. Seder, A. Selyunin, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, F. Sozzi, A. Srnka, D. Steffen, M. Stolarski, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, M. Tasevsky, S. Tessaro, F. Tessarotto, F. Thibaud, F. Tosello, V. Tskhay, S. Uhl, J. Veloso, M. Virius, J. Vondra, S. Wallner, T. Weisrock, M. Wilfert, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Exclusive production of ω mesons was studied at the COMPASS experiment by scattering 160 GeV/c muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured in the range of photon virtuality 1 (GeV/c)2

Published
2017
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19. Multiplicities of charged pions and charged hadrons from deep-inelastic scattering of muons off an isoscalar target

Author

C. Adolph, M. Aghasyan, R. Akhunzyanov, G.D. Alexeev, M.G. Alexeev, A. Amoroso, V. Andrieux, N.V. Anfimov, V. Anosov, K. Augsten, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, L. Capozza, W.-C. Chang, C. Chatterjee, M. Chiosso, I. Choi, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, D. von Harrach, R. Hashimoto, F.H. Heinsius, R. Heitz, F. Herrmann, F. Hinterberger, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, R. Joosten, P. Jörg, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O.M. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, R. Kuhn, Y. Kulinich, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, Y.-S. Lian, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, C. Marchand, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G.V. Meshcheryakov, M. Meyer, W. Meyer, T. Michigami, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, P. Montuenga, A. Nagaytsev, F. Nerling, D. Neyret, V.I. Nikolaenko, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, D.V. Peshekhonov, N. Pierre, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, M. Roskot, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rybnikov, A. Rychter, R. Salac, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, T. Sawada, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, E. Seder, A. Selyunin, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, J. Smolik, F. Sozzi, A. Srnka, D. Steffen, M. Stolarski, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, M. Tasevsky, S. Tessaro, F. Tessarotto, F. Thibaud, F. Tosello, V. Tskhay, S. Uhl, J. Veloso, M. Virius, J. Vondra, T. Weisrock, M. Wilfert, R. Windmolders, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, M. Ziembicki, and A. Zink

Subjects
Deep inelastic scattering, Pion multiplicities, Fragmentation functions, Physics, QC1-999
Abstract

Multiplicities of charged pions and charged hadrons produced in deep-inelastic scattering were measured in three-dimensional bins of the Bjorken scaling variable x, the relative virtual-photon energy y and the relative hadron energy z. Data were obtained by the COMPASS Collaboration using a 160GeV muon beam and an isoscalar target (6LiD). They cover the kinematic domain in the photon virtuality Q2>1(GeV/c)2, 0.004

Published
2017
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20. Interplay among transversity induced asymmetries in hadron leptoproduction

Author

C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, W.-C. Chang, M. Chiosso, I. Choi, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, N. d'Hose, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, V. Duic, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, A. Ferrero, M. Finger, M. Finger Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, D. von Harrach, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, N. Horikawa, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jörg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, C. Marchand, B. Marianski, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, P. Montuenga, A. Nagaytsev, F. Nerling, D. Neyret, V.I. Nikolaenko, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, G. Pesaro, M. Pesek, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, A. Selyunin, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, F. Sozzi, A. Srnka, M. Stolarski, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, F. Tosello, V. Tskhay, S. Uhl, J. Veloso, M. Virius, T. Weisrock, M. Wilfert, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink

Subjects
Physics, QC1-999
Abstract

In the fragmentation of a transversely polarized quark several left–right asymmetries are possible for the hadrons in the jet. When only one unpolarized hadron is selected, it exhibits an azimuthal modulation known as the Collins effect. When a pair of oppositely charged hadrons is observed, three asymmetries can be considered, a di-hadron asymmetry and two single hadron asymmetries. In lepton deep inelastic scattering on transversely polarized nucleons all these asymmetries are coupled with the transversity distribution. From the high statistics COMPASS data on oppositely charged hadron-pair production we have investigated for the first time the dependence of these three asymmetries on the difference of the azimuthal angles of the two hadrons. The similarity of transversity induced single and di-hadron asymmetries is discussed. A new analysis of the data allows quantitative relationships to be established among them, providing for the first time strong experimental indication that the underlying fragmentation mechanisms are all driven by a common physical process.

Published
2016
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21. The spin structure function g1p of the proton and a test of the Bjorken sum rule

Author

C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, C. Azevedo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, L. Capozza, W.-C. Chang, M. Chiosso, I. Choi, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, V. Duic, M. Dziewiecki, A. Efremov, P.D. Eversheim, W. Eyrich, A. Ferrero, M. Finger, M. Finger jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse-Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, D. von Harrach, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, N. Horikawa, N. d'Hose, C. -Yu Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jörg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, D. Neyret, V.I. Nikolaenko, J. Novy, W.-D. Nowak, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pesek, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, E. Rocco, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, A. Selyunin, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, F. Sozzi, A. Srnka, M. Stolarski, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, F. Tosello, V. Tskhay, S. Uhl, J. Veloso, M. Virius, T. Weisrock, M. Wilfert, R. Windmolders, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink

Subjects
Physics, QC1-999
Abstract

New results for the double spin asymmetry A1p and the proton longitudinal spin structure function g1p are presented. They were obtained by the COMPASS Collaboration using polarised 200 GeV muons scattered off a longitudinally polarised NH3 target. The data were collected in 2011 and complement those recorded in 2007 at 160 GeV, in particular at lower values of x. They improve the statistical precision of g1p(x) by about a factor of two in the region x≲0.02. A next-to-leading order QCD fit to the g1 world data is performed. It leads to a new determination of the quark spin contribution to the nucleon spin, ΔΣ, ranging from 0.26 to 0.36, and to a re-evaluation of the first moment of g1p. The uncertainty of ΔΣ is mostly due to the large uncertainty in the present determinations of the gluon helicity distribution. A new evaluation of the Bjorken sum rule based on the COMPASS results for the non-singlet structure function g1NS(x,Q2) yields as ratio of the axial and vector coupling constants |gA/gV|=1.22±0.05 (stat.)±0.10 (syst.), which validates the sum rule to an accuracy of about 9%.

Published
2016
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22. Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high pT

Author

C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, W. Augustyniak, A. Austregesilo, C.D.R. Azevedo, B. Badełek, F. Balestra, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, K. Bicker, E.R. Bielert, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, W.-C. Chang, M. Chiosso, I. Choi, S.-U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, L. Dhara, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, F. Giordano, I. Gnesi, M. Gorzellik, S. Grabmüller, A. Grasso, M. Grosse Perdekamp, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. Hahne, D. von Harrach, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, N. Horikawa, N. d'Hose, C.-Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, R. Joosten, P. Jörg, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, P. Kremser, F. Krinner, Z.V. Kroumchtein, N. Kuchinski, R. Kuhn, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, R. Longo, A. Maggiora, A. Magnon, N. Makins, N. Makke, G.K. Mallot, C. Marchand, B. Marianski, A. Martin, J. Marzec, J. Matoušek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, P. Montuenga, A. Nagaytsev, F. Nerling, D. Neyret, V.I. Nikolaenko, J. Nový, W.-D. Nowak, G. Nukazuka, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, J.-C. Peng, F. Pereira, M. Pešek, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, C. Riedl, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, C. Santos, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, A. Selyunin, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, F. Sozzi, A. Srnka, M. Stolarski, M. Sulc, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, S. Tessaro, F. Tessarotto, F. Thibaud, F. Tosello, V. Tskhay, S. Uhl, J. Veloso, M. Virius, T. Weisrock, M. Wilfert, J. ter Wolbeek, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink

Subjects
COMPASS, Deep inelastic scattering, Double spin asymmetry, High pT, ΔG, Physics, QC1-999
Abstract

We measured the longitudinal double spin asymmetries ALL for single hadron muoproduction off protons and deuterons at photon virtuality Q2

Published
2016
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23. Precise measurement of the top quark mass in dilepton decays using optimized neutrino weighting

Author

V.M. Abazov, B. Abbott, B.S. Acharya, M. Adams, T. Adams, J.P. Agnew, G.D. Alexeev, G. Alkhazov, A. Alton, A. Askew, S. Atkins, K. Augsten, C. Avila, F. Badaud, L. Bagby, B. Baldin, D.V. Bandurin, S. Banerjee, E. Barberis, P. Baringer, J.F. Bartlett, U. Bassler, V. Bazterra, A. Bean, M. Begalli, L. Bellantoni, S.B. Beri, G. Bernardi, R. Bernhard, I. Bertram, M. Besançon, R. Beuselinck, P.C. Bhat, S. Bhatia, V. Bhatnagar, G. Blazey, S. Blessing, K. Bloom, A. Boehnlein, D. Boline, E.E. Boos, G. Borissov, M. Borysova, A. Brandt, O. Brandt, R. Brock, A. Bross, D. Brown, X.B. Bu, M. Buehler, V. Buescher, V. Bunichev, S. Burdin, C.P. Buszello, E. Camacho-Pérez, B.C.K. Casey, H. Castilla-Valdez, S. Caughron, S. Chakrabarti, K.M. Chan, A. Chandra, E. Chapon, G. Chen, S.W. Cho, S. Choi, B. Choudhary, S. Cihangir, D. Claes, J. Clutter, M. Cooke, W.E. Cooper, M. Corcoran, F. Couderc, M.-C. Cousinou, J. Cuth, D. Cutts, A. Das, G. Davies, S.J. de Jong, E. De La Cruz-Burelo, F. Déliot, R. Demina, D. Denisov, S.P. Denisov, S. Desai, C. Deterre, K. DeVaughan, H.T. Diehl, M. Diesburg, P.F. Ding, A. Dominguez, A. Dubey, L.V. Dudko, A. Duperrin, S. Dutt, M. Eads, D. Edmunds, J. Ellison, V.D. Elvira, Y. Enari, H. Evans, A. Evdokimov, V.N. Evdokimov, A. Fauré, L. Feng, T. Ferbel, F. Fiedler, F. Filthaut, W. Fisher, H.E. Fisk, M. Fortner, H. Fox, S. Fuess, P.H. Garbincius, A. Garcia-Bellido, J.A. García-González, V. Gavrilov, W. Geng, C.E. Gerber, Y. Gershtein, G. Ginther, O. Gogota, G. Golovanov, P.D. Grannis, S. Greder, H. Greenlee, G. Grenier, Ph. Gris, J.-F. Grivaz, A. Grohsjean, S. Grünendahl, M.W. Grünewald, T. Guillemin, G. Gutierrez, P. Gutierrez, J. Haley, L. Han, K. Harder, A. Harel, J.M. Hauptman, J. Hays, T. Head, T. Hebbeker, D. Hedin, H. Hegab, A.P. Heinson, U. Heintz, C. Hensel, I. Heredia-De La Cruz, K. Herner, G. Hesketh, M.D. Hildreth, R. Hirosky, T. Hoang, J.D. Hobbs, B. Hoeneisen, J. Hogan, M. Hohlfeld, J.L. Holzbauer, I. Howley, Z. Hubacek, V. Hynek, I. Iashvili, Y. Ilchenko, R. Illingworth, A.S. Ito, S. Jabeen, M. Jaffré, A. Jayasinghe, M.S. Jeong, R. Jesik, P. Jiang, K. Johns, E. Johnson, M. Johnson, A. Jonckheere, P. Jonsson, J. Joshi, A.W. Jung, A. Juste, E. Kajfasz, D. Karmanov, I. Katsanos, M. Kaur, R. Kehoe, S. Kermiche, N. Khalatyan, A. Khanov, A. Kharchilava, Y.N. Kharzheev, I. Kiselevich, J.M. Kohli, A.V. Kozelov, J. Kraus, A. Kumar, A. Kupco, T. Kurča, V.A. Kuzmin, S. Lammers, P. Lebrun, H.S. Lee, S.W. Lee, W.M. Lee, X. Lei, J. Lellouch, D. Li, H. Li, L. Li, Q.Z. Li, J.K. Lim, D. Lincoln, J. Linnemann, V.V. Lipaev, R. Lipton, H. Liu, Y. Liu, A. Lobodenko, M. Lokajicek, R. Lopes de Sa, R. Luna-Garcia, A.L. Lyon, A.K.A. Maciel, R. Madar, R. Magaña-Villalba, S. Malik, V.L. Malyshev, J. Mansour, J. Martínez-Ortega, R. McCarthy, C.L. McGivern, M.M. Meijer, A. Melnitchouk, D. Menezes, P.G. Mercadante, M. Merkin, A. Meyer, J. Meyer, F. Miconi, N.K. Mondal, M. Mulhearn, E. Nagy, M. Narain, R. Nayyar, H.A. Neal, J.P. Negret, P. Neustroev, H.T. Nguyen, T. Nunnemann, J. Orduna, N. Osman, J. Osta, A. Pal, N. Parashar, V. Parihar, S.K. Park, R. Partridge, N. Parua, A. Patwa, B. Penning, M. Perfilov, Y. Peters, K. Petridis, G. Petrillo, P. Pétroff, M.-A. Pleier, V.M. Podstavkov, A.V. Popov, M. Prewitt, D. Price, N. Prokopenko, J. Qian, A. Quadt, B. Quinn, P.N. Ratoff, I. Razumov, I. Ripp-Baudot, F. Rizatdinova, M. Rominsky, A. Ross, C. Royon, P. Rubinov, R. Ruchti, G. Sajot, A. Sánchez-Hernández, M.P. Sanders, A.S. Santos, G. Savage, M. Savitskyi, L. Sawyer, T. Scanlon, R.D. Schamberger, Y. Scheglov, H. Schellman, M. Schott, C. Schwanenberger, R. Schwienhorst, J. Sekaric, H. Severini, E. Shabalina, V. Shary, S. Shaw, A.A. Shchukin, V. Simak, P. Skubic, P. Slattery, D. Smirnov, G.R. Snow, J. Snow, S. Snyder, S. Söldner-Rembold, L. Sonnenschein, K. Soustruznik, J. Stark, D.A. Stoyanova, M. Strauss, L. Suter, P. Svoisky, M. Titov, V.V. Tokmenin, Y.-T. Tsai, D. Tsybychev, B. Tuchming, C. Tully, L. Uvarov, S. Uvarov, S. Uzunyan, R. Van Kooten, W.M. van Leeuwen, N. Varelas, E.W. Varnes, I.A. Vasilyev, A.Y. Verkheev, L.S. Vertogradov, M. Verzocchi, M. Vesterinen, D. Vilanova, P. Vokac, H.D. Wahl, M.H.L.S. Wang, J. Warchol, G. Watts, M. Wayne, J. Weichert, L. Welty-Rieger, M.R.J. Williams, G.W. Wilson, M. Wobisch, D.R. Wood, T.R. Wyatt, Y. Xie, R. Yamada, S. Yang, T. Yasuda, Y.A. Yatsunenko, W. Ye, Z. Ye, H. Yin, K. Yip, S.W. Youn, J.M. Yu, J. Zennamo, T.G. Zhao, B. Zhou, J. Zhu, M. Zielinski, D. Zieminska, and L. Zivkovic

Subjects
Physics, QC1-999
Abstract

We measure the top quark mass in dilepton final states of tt¯ events in pp¯ collisions at s=1.96 TeV, using data corresponding to an integrated luminosity of 9.7 fb−1 at the Fermilab Tevatron Collider. The analysis features a comprehensive optimization of the neutrino weighting method to minimize the statistical uncertainties. We also improve the calibration of jet energies using the calibration determined in tt¯→lepton+jets events, which reduces the otherwise limiting systematic uncertainty from the jet energy scale. The measured top quark mass is mt=173.32±1.36(stat)±0.85(syst) GeV.

Published
2016
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24. Collins and Sivers asymmetries in muonproduction of pions and kaons off transversely polarised protons

Author

C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, K. Bicker, E.R. Bielert, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Jörg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, J. Novy, W.-D. Nowak, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, G. Pesaro, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, E. Rocco, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Virius, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink

Subjects
Physics, QC1-999
Abstract

Measurements of the Collins and Sivers asymmetries for charged pions and charged and neutral kaons produced in semi-inclusive deep-inelastic scattering of high energy muons off transversely polarised protons are presented. The results were obtained using all the available COMPASS proton data, which were taken in the years 2007 and 2010. The Collins asymmetries exhibit in the valence region a non-zero signal for pions and there are hints of non-zero signal also for kaons. The Sivers asymmetries are found to be positive for positive pions and kaons and compatible with zero otherwise.

Published
2015
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25. Measurement of the W+b-jet and W+c-jet differential production cross sections in pp¯ collisions at s=1.96 TeV

Author

V.M. Abazov, B. Abbott, B.S. Acharya, M. Adams, T. Adams, J.P. Agnew, G.D. Alexeev, G. Alkhazov, A. Alton, A. Askew, S. Atkins, K. Augsten, C. Avila, F. Badaud, L. Bagby, B. Baldin, D.V. Bandurin, S. Banerjee, E. Barberis, P. Baringer, J.F. Bartlett, U. Bassler, V. Bazterra, A. Bean, M. Begalli, L. Bellantoni, S.B. Beri, G. Bernardi, R. Bernhard, I. Bertram, M. Besançon, R. Beuselinck, P.C. Bhat, S. Bhatia, V. Bhatnagar, G. Blazey, S. Blessing, K. Bloom, A. Boehnlein, D. Boline, E.E. Boos, G. Borissov, M. Borysova, O. Borysov, A. Brandt, O. Brandt, R. Brock, A. Bross, D. Brown, X.B. Bu, M. Buehler, V. Buescher, V. Bunichev, S. Burdin, C.P. Buszello, E. Camacho-Pérez, B.C.K. Casey, H. Castilla-Valdez, S. Caughron, S. Chakrabarti, K.M. Chan, A. Chandra, E. Chapon, G. Chen, S.W. Cho, S. Choi, B. Choudhary, S. Cihangir, D. Claes, J. Clutter, M. Cooke, W.E. Cooper, M. Corcoran, F. Couderc, M.-C. Cousinou, D. Cutts, A. Das, G. Davies, S.J. de Jong, E. De La Cruz-Burelo, F. Déliot, R. Demina, D. Denisov, S.P. Denisov, S. Desai, C. Deterre, K. DeVaughan, H.T. Diehl, M. Diesburg, P.F. Ding, A. Dominguez, A. Dubey, L.V. Dudko, A. Duperrin, S. Dutt, M. Eads, D. Edmunds, J. Ellison, V.D. Elvira, Y. Enari, H. Evans, V.N. Evdokimov, A. Fauré, L. Feng, T. Ferbel, F. Fiedler, F. Filthaut, W. Fisher, H.E. Fisk, M. Fortner, H. Fox, S. Fuess, P.H. Garbincius, A. Garcia-Bellido, J.A. García-González, V. Gavrilov, W. Geng, C.E. Gerber, Y. Gershtein, G. Ginther, O. Gogota, G. Golovanov, P.D. Grannis, S. Greder, H. Greenlee, G. Grenier, Ph. Gris, J.-F. Grivaz, A. Grohsjean, S. Grünendahl, M.W. Grünewald, T. Guillemin, G. Gutierrez, P. Gutierrez, J. Haley, L. Han, K. Harder, A. Harel, J.M. Hauptman, J. Hays, T. Head, T. Hebbeker, D. Hedin, H. Hegab, A.P. Heinson, U. Heintz, C. Hensel, I. Heredia-De La Cruz, K. Herner, G. Hesketh, M.D. Hildreth, R. Hirosky, T. Hoang, J.D. Hobbs, B. Hoeneisen, J. Hogan, M. Hohlfeld, J.L. Holzbauer, I. Howley, Z. Hubacek, V. Hynek, I. Iashvili, Y. Ilchenko, R. Illingworth, A.S. Ito, S. Jabeen, M. Jaffré, A. Jayasinghe, M.S. Jeong, R. Jesik, P. Jiang, K. Johns, E. Johnson, M. Johnson, A. Jonckheere, P. Jonsson, J. Joshi, A.W. Jung, A. Juste, E. Kajfasz, D. Karmanov, I. Katsanos, M. Kaur, R. Kehoe, S. Kermiche, N. Khalatyan, A. Khanov, A. Kharchilava, Y.N. Kharzheev, I. Kiselevich, J.M. Kohli, A.V. Kozelov, J. Kraus, A. Kumar, A. Kupco, T. Kurča, V.A. Kuzmin, S. Lammers, P. Lebrun, H.S. Lee, S.W. Lee, W.M. Lee, X. Lei, J. Lellouch, D. Li, H. Li, L. Li, Q.Z. Li, J.K. Lim, D. Lincoln, J. Linnemann, V.V. Lipaev, R. Lipton, H. Liu, Y. Liu, A. Lobodenko, M. Lokajicek, R. Lopes de Sa, R. Luna-Garcia, A.L. Lyon, A.K.A. Maciel, R. Madar, R. Magaña-Villalba, S. Malik, V.L. Malyshev, J. Mansour, J. Martínez-Ortega, R. McCarthy, C.L. McGivern, M.M. Meijer, A. Melnitchouk, D. Menezes, P.G. Mercadante, M. Merkin, A. Meyer, J. Meyer, F. Miconi, N.K. Mondal, M. Mulhearn, E. Nagy, M. Narain, R. Nayyar, H.A. Neal, J.P. Negret, P. Neustroev, H.T. Nguyen, T. Nunnemann, J. Orduna, N. Osman, J. Osta, A. Pal, N. Parashar, V. Parihar, S.K. Park, R. Partridge, N. Parua, A. Patwa, B. Penning, M. Perfilov, Y. Peters, K. Petridis, G. Petrillo, P. Pétroff, M.-A. Pleier, V.M. Podstavkov, A.V. Popov, M. Prewitt, D. Price, N. Prokopenko, J. Qian, A. Quadt, B. Quinn, P.N. Ratoff, I. Razumov, I. Ripp-Baudot, F. Rizatdinova, M. Rominsky, A. Ross, C. Royon, P. Rubinov, R. Ruchti, G. Sajot, A. Sánchez-Hernández, M.P. Sanders, A.S. Santos, G. Savage, M. Savitskyi, L. Sawyer, T. Scanlon, R.D. Schamberger, Y. Scheglov, H. Schellman, C. Schwanenberger, R. Schwienhorst, J. Sekaric, H. Severini, E. Shabalina, V. Shary, S. Shaw, A.A. Shchukin, V. Simak, P. Skubic, P. Slattery, D. Smirnov, G.R. Snow, J. Snow, S. Snyder, S. Söldner-Rembold, L. Sonnenschein, K. Soustruznik, J. Stark, D.A. Stoyanova, M. Strauss, L. Suter, P. Svoisky, M. Titov, V.V. Tokmenin, Y.-T. Tsai, D. Tsybychev, B. Tuchming, C. Tully, L. Uvarov, S. Uvarov, S. Uzunyan, R. Van Kooten, W.M. van Leeuwen, N. Varelas, E.W. Varnes, I.A. Vasilyev, A.Y. Verkheev, L.S. Vertogradov, M. Verzocchi, M. Vesterinen, D. Vilanova, P. Vokac, H.D. Wahl, M.H.L.S. Wang, J. Warchol, G. Watts, M. Wayne, J. Weichert, L. Welty-Rieger, M.R.J. Williams, G.W. Wilson, M. Wobisch, D.R. Wood, T.R. Wyatt, Y. Xie, R. Yamada, S. Yang, T. Yasuda, Y.A. Yatsunenko, W. Ye, Z. Ye, H. Yin, K. Yip, S.W. Youn, J.M. Yu, J. Zennamo, T.G. Zhao, B. Zhou, J. Zhu, M. Zielinski, D. Zieminska, and L. Zivkovic

Subjects
Physics, QC1-999
Abstract

We present a measurement of the cross sections for the associated production of a W boson with at least one heavy quark jet, b or c, in proton–antiproton collisions. Data corresponding to an integrated luminosity of 8.7 fb−1 recorded with the D0 detector at the Fermilab Tevatron pp¯ Collider at s=1.96 TeV are used to measure the cross sections differentially as a function of the jet transverse momenta in the range 20 to 150 GeV. These results are compared to calculations of perturbative QCD theory as well as predictions from Monte Carlo generators.

Published
2015
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26. Search for exclusive photoproduction of Zc±(3900) at COMPASS

Author

C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, K. Bicker, E.R. Bielert, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Jörg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, V.I. Nikolaenko, J. Novy, W.-D. Nowak, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, E. Rocco, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Virius, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink

Subjects
Physics, QC1-999
Abstract

A search for the exclusive production of the Zc±(3900) hadron by virtual photons has been performed in the channel Zc±(3900)→J/ψπ±. The data cover the range from 7 GeV to 19 GeV in the centre-of-mass energy of the photon–nucleon system. The full set of the COMPASS data set collected with a muon beam between 2002 and 2011 has been used. An upper limit for the ratio BR(Zc±(3900)→J/ψπ±)×σγN→Zc±(3900)N/σγN→J/ψN of 3.7×10−3 has been established at the confidence level of 90%. Keywords: COMPASS, Zc(3900), Photoproduction, Tetraquark

Published
2015
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27. Odd and even partial waves of ηπ− and η′π− in π−p→η(′)π−p at 191 GeV/c

Author

C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, K. Bicker, E.R. Bielert, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, T. Grussenmeyer, A. Guskov, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Jörg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, J. Novy, W.-D. Nowak, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, D.V. Peshekhonov, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, E. Rocco, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Virius, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink

Subjects
Physics, QC1-999
Abstract

Exclusive production of ηπ− and η′π− has been studied with a 191 GeV/c π− beam impinging on a hydrogen target at COMPASS (CERN). Partial-wave analyses reveal different odd/even angular momentum (L) characteristics in the inspected invariant mass range up to 3 GeV/c2. A striking similarity between the two systems is observed for the L=2,4,6 intensities (scaled by kinematical factors) and the relative phases. The known resonances a2(1320) and a4(2040) are in line with this similarity. In contrast, a strong enhancement of η′π− over ηπ− is found for the L=1,3,5 waves, which carry non-qq¯ quantum numbers. The L=1 intensity peaks at 1.7 GeV/c2 in η′π− and at 1.4 GeV/c2 in ηπ−, the corresponding phase motions with respect to L=2 are different.

Published
2015
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28. Measurement of the differential γ+2b-jet cross section and the ratio σ(γ+2b-jets)/σ(γ+b-jet) in pp¯ collisions at s=1.96 TeV

Author

V.M. Abazov, B. Abbott, B.S. Acharya, M. Adams, T. Adams, J.P. Agnew, G.D. Alexeev, G. Alkhazov, A. Alton, A. Askew, S. Atkins, K. Augsten, C. Avila, F. Badaud, L. Bagby, B. Baldin, D.V. Bandurin, S. Banerjee, E. Barberis, P. Baringer, J.F. Bartlett, U. Bassler, V. Bazterra, A. Bean, M. Begalli, L. Bellantoni, S.B. Beri, G. Bernardi, R. Bernhard, I. Bertram, M. Besançon, R. Beuselinck, P.C. Bhat, S. Bhatia, V. Bhatnagar, G. Blazey, S. Blessing, K. Bloom, A. Boehnlein, D. Boline, E.E. Boos, G. Borissov, M. Borysova, A. Brandt, O. Brandt, R. Brock, A. Bross, D. Brown, X.B. Bu, M. Buehler, V. Buescher, V. Bunichev, S. Burdin, C.P. Buszello, E. Camacho-Pérez, B.C.K. Casey, H. Castilla-Valdez, S. Caughron, S. Chakrabarti, K.M. Chan, A. Chandra, E. Chapon, G. Chen, S.W. Cho, S. Choi, B. Choudhary, S. Cihangir, D. Claes, J. Clutter, M. Cooke, W.E. Cooper, M. Corcoran, F. Couderc, M.-C. Cousinou, D. Cutts, A. Das, G. Davies, S.J. de Jong, E. De La Cruz-Burelo, F. Déliot, R. Demina, D. Denisov, S.P. Denisov, S. Desai, C. Deterre, K. DeVaughan, H.T. Diehl, M. Diesburg, P.F. Ding, A. Dominguez, A. Dubey, L.V. Dudko, A. Duperrin, S. Dutt, M. Eads, D. Edmunds, J. Ellison, V.D. Elvira, Y. Enari, H. Evans, V.N. Evdokimov, A. Fauré, L. Feng, T. Ferbel, F. Fiedler, F. Filthaut, W. Fisher, H.E. Fisk, M. Fortner, H. Fox, S. Fuess, P.H. Garbincius, A. Garcia-Bellido, J.A. García-González, V. Gavrilov, W. Geng, C.E. Gerber, Y. Gershtein, G. Ginther, O. Gogota, G. Golovanov, P.D. Grannis, S. Greder, H. Greenlee, G. Grenier, Ph. Gris, J.-F. Grivaz, A. Grohsjean, S. Grünendahl, M.W. Grünewald, T. Guillemin, G. Gutierrez, P. Gutierrez, J. Haley, L. Han, K. Harder, A. Harel, J.M. Hauptman, J. Hays, T. Head, T. Hebbeker, D. Hedin, H. Hegab, A.P. Heinson, U. Heintz, C. Hensel, I. Heredia-De La Cruz, K. Herner, G. Hesketh, M.D. Hildreth, R. Hirosky, T. Hoang, J.D. Hobbs, B. Hoeneisen, J. Hogan, M. Hohlfeld, J.L. Holzbauer, I. Howley, Z. Hubacek, V. Hynek, I. Iashvili, Y. Ilchenko, R. Illingworth, A.S. Ito, S. Jabeen, M. Jaffré, A. Jayasinghe, M.S. Jeong, R. Jesik, P. Jiang, K. Johns, E. Johnson, M. Johnson, A. Jonckheere, P. Jonsson, J. Joshi, A.W. Jung, A. Juste, E. Kajfasz, D. Karmanov, I. Katsanos, M. Kaur, R. Kehoe, S. Kermiche, N. Khalatyan, A. Khanov, A. Kharchilava, Y.N. Kharzheev, I. Kiselevich, J.M. Kohli, A.V. Kozelov, J. Kraus, A. Kumar, A. Kupco, T. Kurča, V.A. Kuzmin, S. Lammers, P. Lebrun, H.S. Lee, S.W. Lee, W.M. Lee, X. Lei, J. Lellouch, D. Li, H. Li, L. Li, Q.Z. Li, J.K. Lim, D. Lincoln, J. Linnemann, V.V. Lipaev, R. Lipton, H. Liu, Y. Liu, A. Lobodenko, M. Lokajicek, R. Lopes de Sa, R. Luna-Garcia, A.L. Lyon, A.K.A. Maciel, R. Madar, R. Magaña-Villalba, S. Malik, V.L. Malyshev, J. Mansour, J. Martínez-Ortega, R. McCarthy, C.L. McGivern, M.M. Meijer, A. Melnitchouk, D. Menezes, P.G. Mercadante, M. Merkin, A. Meyer, J. Meyer, F. Miconi, N.K. Mondal, M. Mulhearn, E. Nagy, M. Narain, R. Nayyar, H.A. Neal, J.P. Negret, P. Neustroev, H.T. Nguyen, T. Nunnemann, J. Orduna, N. Osman, J. Osta, A. Pal, N. Parashar, V. Parihar, S.K. Park, R. Partridge, N. Parua, A. Patwa, B. Penning, M. Perfilov, Y. Peters, K. Petridis, G. Petrillo, P. Pétroff, M.-A. Pleier, V.M. Podstavkov, A.V. Popov, M. Prewitt, D. Price, N. Prokopenko, J. Qian, A. Quadt, B. Quinn, P.N. Ratoff, I. Razumov, I. Ripp-Baudot, F. Rizatdinova, M. Rominsky, A. Ross, C. Royon, P. Rubinov, R. Ruchti, G. Sajot, A. Sánchez-Hernández, M.P. Sanders, A.S. Santos, G. Savage, M. Savitskyi, L. Sawyer, T. Scanlon, R.D. Schamberger, Y. Scheglov, H. Schellman, C. Schwanenberger, R. Schwienhorst, J. Sekaric, H. Severini, E. Shabalina, V. Shary, S. Shaw, A.A. Shchukin, V. Simak, P. Skubic, P. Slattery, D. Smirnov, G.R. Snow, J. Snow, S. Snyder, S. Söldner-Rembold, L. Sonnenschein, K. Soustruznik, J. Stark, D.A. Stoyanova, M. Strauss, L. Suter, P. Svoisky, M. Titov, V.V. Tokmenin, Y.-T. Tsai, D. Tsybychev, B. Tuchming, C. Tully, L. Uvarov, S. Uvarov, S. Uzunyan, R. Van Kooten, W.M. van Leeuwen, N. Varelas, E.W. Varnes, I.A. Vasilyev, A.Y. Verkheev, L.S. Vertogradov, M. Verzocchi, M. Vesterinen, D. Vilanova, P. Vokac, H.D. Wahl, M.H.L.S. Wang, J. Warchol, G. Watts, M. Wayne, J. Weichert, L. Welty-Rieger, M.R.J. Williams, G.W. Wilson, M. Wobisch, D.R. Wood, T.R. Wyatt, Y. Xie, R. Yamada, S. Yang, T. Yasuda, Y.A. Yatsunenko, W. Ye, Z. Ye, H. Yin, K. Yip, S.W. Youn, J.M. Yu, J. Zennamo, T.G. Zhao, B. Zhou, J. Zhu, M. Zielinski, D. Zieminska, and L. Zivkovic

Subjects
Physics, QC1-999
Abstract

We present the first measurements of the differential cross section dσ/dpTγ for the production of an isolated photon in association with at least two b-quark jets. The measurements consider photons with rapidities |yγ|15 GeV and |yjet|

Published
2014
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29. A high-statistics measurement of transverse spin effects in dihadron production from muon–proton semi-inclusive deep-inelastic scattering

Author

C. Adolph, R. Akhunzyanov, M.G. Alekseev, Yu. Alexandrov, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, R. Bertini, K. Bicker, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bravar, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, R. Garfagnini, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, M. Giorgi, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, A. Guskov, T. Guthörl, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Joerg, R. Joosten, E. Kabuß, D. Kang, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, Z. Kral, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, V.I. Nikolaenko, J. Novy, W.-D. Nowak, A.S. Nunes, I. Orlov, A.G. Olshevsky, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, M. Pesek, D. Peshekhonov, G. Piragino, S. Platchkov, J. Pochodzalla, J. Polak, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, G. Reicherz, E. Rocco, V. Rodionov, E. Rondio, A. Rychter, N.S. Rossiyskaya, D.I. Ryabchikov, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, A. Schmidt, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Vandenbroucke, M. Virius, J. Vondra, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, W. Wiślicki, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, and M. Ziembicki

Subjects
Physics, QC1-999
Abstract

A measurement of the azimuthal asymmetry in dihadron production in deep-inelastic scattering of muons on transversely polarised proton (NH3) targets is presented. They provide independent access to the transversity distribution functions through the measurement of the Collins asymmetry in single hadron production. The data were taken in the year 2010 with the COMPASS spectrometer using a 160 GeV/c muon beam of the CERN SPS, increasing by a factor of about four the overall statistics with respect to the previously published data taken in the year 2007. The measured sizeable asymmetry is in good agreement with the published data. An approximate equality of the Collins asymmetry and the dihadron asymmetry is observed, suggesting a common physical mechanism in the underlying fragmentation.

Published
2014
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30. Measurement of azimuthal hadron asymmetries in semi-inclusive deep inelastic scattering off unpolarised nucleons

Author

C. Adolph, R. Akhunzyanov, M.G. Alexeev, Yu. Alexandrov, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, R. Bertini, K. Bicker, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bravar, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, R. Garfagnini, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, M. Giorgi, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, A. Guskov, T. Guthörl, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Joerg, R. Joosten, E. Kabuß, D. Kang, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, Z. Kral, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, V.I. Nikolaenko, J. Novy, W.-D. Nowak, A.S. Nunes, I. Orlov, A.G. Olshevsky, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, M. Pesek, D. Peshekhonov, G. Piragino, S. Platchkov, J. Pochodzalla, J. Polak, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, G. Reicherz, E. Rocco, V. Rodionov, E. Rondio, A. Rychter, N.S. Rossiyskaya, D.I. Ryabchikov, V.D. Samoylenko, A. Sandacz, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, A. Schmidt, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szableski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Vandenbroucke, M. Virius, J. Vondra, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, W. Wiślicki, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, and M. Ziembicki

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Spin-averaged asymmetries in the azimuthal distributions of positive and negative hadrons produced in deep inelastic scattering were measured using the CERN SPS longitudinally polarised muon beam at 160 GeV/c and a 6LiD target. The amplitudes of the three azimuthal modulations cos⁡ϕh, cos⁡2ϕh and sin⁡ϕh were obtained binning the data separately in each of the relevant kinematic variables x, z or pTh and binning in a three-dimensional grid of these three variables. The amplitudes of the cos⁡ϕh and cos⁡2ϕh modulations show strong kinematic dependencies both for positive and negative hadrons.

Published
2014
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31. Spin alignment and violation of the OZI rule in exclusive ω and ϕ production in pp collisions

Author

C. Adolph, R. Akhunzyanov, M.G. Alexeev, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, K. Bicker, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, M. Finger, Jr., H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, T. Grussenmeyer, A. Guskov, T. Guthörl, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Joerg, R. Joosten, E. Kabuß, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, M. Levillain, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, V.I. Nikolaenko, J. Novy, W.-D. Nowak, A.S. Nunes, A.G. Olshevsky, I. Orlov, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, S. Platchkov, J. Pochodzalla, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, C. Regali, G. Reicherz, E. Rocco, N.S. Rossiyskaya, D.I. Ryabchikov, A. Rychter, V.D. Samoylenko, A. Sandacz, M. Sapozhnikov, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, K. Schmidt, H. Schmieden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szableski, T. Szameitat, P. Sznajder, S. Takekawa, J. ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Virius, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, and A. Zink

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Exclusive production of the isoscalar vector mesons ω and ϕ is measured with a 190 GeV/c proton beam impinging on a liquid hydrogen target. Cross section ratios are determined in three intervals of the Feynman variable xF of the fast proton. A significant violation of the OZI rule is found, confirming earlier findings. Its kinematic dependence on xF and on the invariant mass MpV of the system formed by fast proton pfast and vector meson V is discussed in terms of diffractive production of pfastV resonances in competition with central production. The measurement of the spin density matrix element ρ00 of the vector mesons in different selected reference frames provides another handle to distinguish the contributions of these two major reaction types. Again, dependences of the alignment on xF and on MpV are found. Most of the observations can be traced back to the existence of several excited baryon states contributing to ω production which are absent in the case of the ϕ meson. Removing the low-mass MpV resonant region, the OZI rule is found to be violated by a factor of eight, independently of xF.

Published
2014
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32. Search for muoproduction of X(3872) at COMPASS and indication of a new state X˜(3872)

Author

L. Silva, S.S. Dasgupta, A.G. Chumakov, J. Nový, Y. Miyachi, P.D. Eversheim, P. Zavada, E. Zemlyanichkina, François Herrmann, S. Uhl, Y. Bedfer, A. Antoshkin, G. Sbrizzai, N.S. Rogacheva, A. Ferrero, G.V. Khaustov, A. Magnon, F. Pereira, I. Konorov, J. ter Wolbeek, Maria Liz Crespo, C. Regali, J. Marzec, A. Kveton, G.D. Alexeev, K. Schmidt, P. Kremser, O.Yu. Denisov, F. Gautheron, F. Nerling, Yu.A. Khokhlov, K. Kondo, N. C. R. Makins, M. Faessler, V.N. Kolosov, A. Amoroso, H. Matsuda, D. Neyret, C.D.R. Azevedo, V. Jary, V. Anosov, M. Grosse Perdekamp, S. Sarkar, Y.-S. Lian, R. Beck, A. Selyunin, B. Grube, M. Stolarski, M. Tasevsky, T. Sawada, N. Horikawa, M. Sulc, S. Tessaro, D. Hahne, V.D. Samoylenko, J. Giarra, N. d'Hose, W. Meyer, R. Joosten, Andres Cicuttin, O. Subrt, S. Wallner, S. Platchkov, R. Salac, Jen-Chieh Peng, V.A. Polyakov, J. Veloso, N. Zhuravlev, G.V. Meshcheryakov, A. Sandacz, M. Virius, F. H. Heinsius, S. Ishimoto, M. Aghasyan, A.M. Kotzinian, M. Zavertyaev, Jan Matousek, G. Reicherz, S. Dalla Torre, C. Quintans, M. Pešek, J. Barth, Alan D. Martin, M. Chiosso, N.V. Anfimov, Jan Tomsa, M. Ostrick, R.P. Kurjata, M. Finger, E. Kabuß, R.R. Dusaev, A.S. Nunes, T. Weisrock, R. Birsa, K. Augsten, V. Frolov, A. Maggiora, A. Vauth, A.A. Lednev, V.E. Lyubovitskij, C. Chatterjee, P. Jörg, Yakov Petrovich Kulinich, Gerhard K. Mallot, Andrey Ivanov, Frank Klein, P. Bordalo, A. Nagaytsev, Johannes Bernhard, Ch. Dreisbach, D. Panzieri, K. Zaremba, E.R. Bielert, Markus F. Krämer, J. Pochodzalla, K. Königsmann, M. Slunecka, A. Guskov, J.M. Friedrich, A. Srnka, H. Suzuki, S. Dasgupta, B. Marianski, T. Grussenmeyer, A. Rybnikov, Andrea Bressan, Anatoli Vasilievich Efremov, L. Dhara, T. Matsuda, M. Meyer, M. Dziewiecki, Markus Ball, M. Gorzellik, W.-D. Nowak, Yu. Kisselev, P. Schiavon, C. Santos, E. Mitrofanov, Bakur Parsamyan, W. Dünnweber, Martin Bodlak, Yu. Ivanshin, M.G. Alexeev, Ilya Kuznetsov, W. C. Chang, S.V. Donskov, D. Steffen, M. Wilfert, J. Smolik, K. Bicker, S. Ramos, L. Sinha, J. Pretz, E. Fuchey, S. Levorato, A. Austregesilo, A. Gridin, I. J. Choi, N. Mitrofanov, C. Franco, Stephan M. Paul, M. Levillain, A. Thiel, C. Riedl, V. Andrieux, Mikhail Mikhasenko, F. Krinner, I.A. Savin, O.P. Gavrichtchouk, N. Makke, I. Orlov, A. Szabelski, F. Giordano, E.A. Levchenko, N. du Fresne von Hohenesche, S. Gerassimov, N. Pierre, R. Longo, M. Quaresma, N. Doshita, B. Ketzer, A. Vidon, Yu.V. Mikhailov, I. Gnesi, G. Hamar, V.F. Konstantinov, P. Sznajder, Z. Kral, T. Iwata, B.I. Vasilishin, A. Grasso, V. Tskhay, H. Fischer, M. Ziembicki, M. Büchele, A. Rychter, S. Sirtl, Z.V. Kroumchtein, F. Balestra, S.-U. Chung, F. Tosello, T. Szameitat, D. von Harrach, K. Schönning, F. Tessarotto, J.H. Koivuniemi, Franco Bradamante, A. Kerbizi, J. Lichtenstadt, F. Kunne, M. Pešková, E. Seder, K. Kurek, G. Nukazuka, D.V. Peshekhonov, R. Heitz, O.M. Kouznetsov, V.E. Burtsev, R. Akhunzyanov, S.A. Mamon, H. Schmieden, C.-Y. Hsieh, B. Badełek, W. Augustyniak, D.I. Ryabchikov, A.G. Olshevsky, and S. Huber

Subjects
Physics, Nuclear and High Energy Physics, Muon, Mass distribution, 010308 nuclear & particles physics, Branching fraction, Hadron, State (functional analysis), 01 natural sciences, Momentum, 0103 physical sciences, Tetraquark, Atomic physics, 010306 general physics, X(3872)
Abstract

We have searched for exclusive production of exotic charmonia in the reaction μ + N → μ + ( J / ψ π + π − ) π ± N ′ using COMPASS data collected with incoming muons of 160 GeV/c and 200 GeV/c momentum. In the J / ψ π + π − mass distribution we observe a signal with a statistical significance of 4.1 σ. Its mass and width are consistent with those of the X ( 3872 ) . The shape of the π + π − mass distribution from the observed decay into J / ψ π + π − shows disagreement with previous observations for X ( 3872 ) . The observed signal may be interpreted as a possible evidence of a new charmonium state. It could be associated with a neutral partner of X ( 3872 ) with C = − 1 predicted by a tetraquark model. The product of cross section and branching fraction of the decay of the observed state into J / ψ π + π − is determined to be 71±28(stat)±39(syst) pb.

Published
2018

33. Search for exclusive photoproduction ofZc±(3900) at COMPASS

Author

F. Sozzi, T. Weisrock, S. Gerassimov, V.D. Samoylenko, E. Zemlyanichkina, Yu.A. Khokhlov, S. Tessaro, R. Windmolders, K. Kondo, P. Jasinski, J. ter Wolbeek, O.P. Gavrichtchouk, L. Sinha, S.S. Dasgupta, R. Sulej, M. Wilfert, Alan D. Martin, A. Maggiora, L. Silva, T. Matsuda, A. Zink, Adam Szabelski, Andres Cicuttin, A. Srnka, R. Joosten, H. Wollny, M. V. Zavertyaev, D.V. Peshekhonov, I. Orlov, N. Doshita, F. Kunne, W. Dünnweber, R. Geyer, M. Chiosso, M. Dziewiecki, D. Hahne, G. Sbrizzai, Takahiro Iwata, I. Konorov, K. Schmidt, V.F. Konstantinov, N. Horikawa, A. Filin, Yu.V. Mikhailov, R. Beck, S. Sosio, P. Sznajder, M. Slunecka, M.G. Alexeev, S. Dalla Torre, C. Braun, P. Jörg, A. Efremov, M. Virius, F. Herrmann, F. Balestra, G. Reicherz, J. Bisplinghoff, J. Pochodzalla, A. Sandacz, C. Quintans, M. Büchele, H. Fischer, A. Rychter, A. Lehmann, Günter Baum, O.Yu. Shevchenko, R. Panknin, Christian Schill, S. Takekawa, J.H. Koivuniemi, K. Königsmann, A. Grasso, I. Gnesi, S. Uhl, E.R. Bielert, A. Nagaytsev, S.-U. Chung, K. Klimaszewski, W.-D. Nowak, Franco Bradamante, M. Ostrick, Bakur Parsamyan, J. Marzec, Johannes Bernhard, F.H. Heinsius, W. Eyrich, A.G. Olshevsky, Andrea Bressan, S. Neubert, R.P. Kurjata, M. Stolarski, Yu. Kisselev, K. Zaremba, F. Nerling, F. Hinterberger, P. Schiavon, L. Steiger, Lei Wang, S. Ramos, A.B. Ivanov, S. Grabmüller, H. Suzuki, T. Schlüter, R. Jahn, A. Ferrero, E. Burtin, V. Duic, Q. Curiel, A. Guskov, I. Uman, J. Pretz, L. Capozza, J. Bieling, E. M. Kabuß, Z.V. Kroumchtein, C. Regali, M. Schott, Ch. Höppner, P. Bordalo, Y. Bedfer, S. Huber, A. Amoroso, Y. Miyachi, A.A. Lednev, F. Gautheron, M. Gorzellik, K. Kurek, S. Platchkov, H. Matsuda, M. Quaresma, A.M. Kotzinian, V. Anosov, N. du Fresne von Hohenesche, I.A. Savin, T. Michigami, G.K. Mallot, V.I. Nikolaenko, Yu. Ivanshin, A. Austregesilo, M. A. Faessler, M. Boer, E. Rocco, C. Franco, D. von Harrach, T. Nagel, S. Schopferer, B. Badełek, S. Goertz, J. Novy, M. Ziembicki, F. Haas, W. Meyer, Maria Liz Crespo, B. Gobbo, S. Paul, C. Adolph, V.A. Polyakov, A. Berlin, C. Elia, G.V. Khaustov, N. Kuchinski, J.M. Friedrich, V. Jary, O.M. Kouznetsov, P.D. Eversheim, N. Makke, A. Magnon, M. Sulc, K. Schönning, V.N. Kolosov, S. Sarkar, N. d'Hose, M. Finger, A.S. Nunes, D. Panzieri, T. Grussenmeyer, S. Ishimoto, R. Birsa, J. Lichtenstadt, T. Szameitat, G.D. Alexeev, D. Neyret, J. Matousek, M. Krämer, B. Grube, J. Barth, H. Schmieden, K. Bicker, R. Hashimoto, D.I. Ryabchikov, F. Tessarotto, M. Levillain, V. Frolov, O.Yu. Denisov, S. Levorato, V. Andrieux, F. Klein, G.V. Meshcheryakov, N.S. Rossiyskaya, S. Sirtl, S.V. Donskov, B. Ketzer, C. Marchand, R. Akhunzyanov, M. Bodlak, and F. Thibaud

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Compass, Hadron, Analytical chemistry, Sigma, High Energy Physics::Experiment, Production (computer science), Tetraquark, Zc(3900), Range (computer programming)
Abstract

A search for the exclusive production of the Z(c)(+/-)(3900) hadron by virtual photons has been performed in the channel Z(c)(+/-)(3900). J/Psi pi(+/-). The data cover the range from 7GeV to 19GeV in the centre-of- mass energy of the photon-nucleon system. The full set of the COMPASS data set collected with a muon beam between 2002 and 2011 has been used. An upper limit for the ratio BR(Z(c)(+/-)(3900)-> J/Psi pi(+/-)) x sigma(gamma N) -> Z(c)(+/-)(3900) N/sigma gamma N -> J/Psi N 3.7 x10(-3) has been established at the confidence level of90%. (C) 2015 The Authors. Published by Elsevier B.V.

Published
2015

34. Transverse target spin asymmetries in exclusive ρ0 muoproduction

Author

C. Adolph, R. Akhunzyanov, M.G. Alekseev, V.Yu. Alexakhin, Yu. Alexandrov, G.D. Alexeev, A. Amoroso, V. Andrieux, V. Anosov, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, R. Beck, Y. Bedfer, A. Berlin, J. Bernhard, R. Bertini, K. Bicker, J. Bieling, R. Birsa, J. Bisplinghoff, M. Bodlak, M. Boer, P. Bordalo, F. Bradamante, C. Braun, A. Bravar, A. Bressan, M. Büchele, E. Burtin, L. Capozza, M. Chiosso, S.U. Chung, A. Cicuttin, M.L. Crespo, Q. Curiel, S. Dalla Torre, S.S. Dasgupta, S. Dasgupta, O.Yu. Denisov, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, M. Dziewiecki, A. Efremov, C. Elia, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, H. Fischer, C. Franco, N. du Fresne von Hohenesche, J.M. Friedrich, V. Frolov, R. Garfagnini, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, M. Giorgi, I. Gnesi, B. Gobbo, S. Goertz, M. Gorzellik, S. Grabmüller, A. Grasso, B. Grube, R. Gushterski, A. Guskov, T. Guthörl, F. Haas, D. von Harrach, D. Hahne, R. Hashimoto, F.H. Heinsius, F. Herrmann, C. Heß, F. Hinterberger, Ch. Höppner, N. Horikawa, N. d'Hose, S. Huber, S. Ishimoto, A. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, V. Jary, P. Jasinski, P. Joerg, R. Joosten, E. Kabuß, D. Kang, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, I. Konorov, V.F. Konstantinov, A.M. Kotzinian, O. Kouznetsov, Z. Kral, M. Krämer, Z.V. Kroumchtein, N. Kuchinski, F. Kunne, K. Kurek, R.P. Kurjata, A.A. Lednev, A. Lehmann, S. Levorato, J. Lichtenstadt, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, C. Marchand, A. Martin, J. Marzec, J. Matousek, H. Matsuda, T. Matsuda, G. Meshcheryakov, W. Meyer, T. Michigami, Yu.V. Mikhailov, Y. Miyachi, A. Nagaytsev, T. Nagel, F. Nerling, S. Neubert, D. Neyret, V.I. Nikolaenko, J. Novy, W.-D. Nowak, A.S. Nunes, I. Orlov, A.G. Olshevsky, M. Ostrick, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, M. Pesek, D. Peshekhonov, G. Piragino, S. Platchkov, J. Pochodzalla, J. Polak, V.A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, S. Ramos, G. Reicherz, E. Rocco, V. Rodionov, E. Rondio, N.S. Rossiyskaya, D.I. Ryabchikov, V.D. Samoylenko, A. Sandacz, M.G. Sapozhnikov, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, A. Schmidt, K. Schmidt, L. Schmitt, H. Schmïden, K. Schönning, S. Schopferer, M. Schott, O.Yu. Shevchenko, L. Silva, L. Sinha, S. Sirtl, M. Slunecka, S. Sosio, F. Sozzi, A. Srnka, L. Steiger, M. Stolarski, M. Sulc, R. Sulej, H. Suzuki, A. Szabelski, T. Szameitat, P. Sznajder, S. Takekawa, J. Ter Wolbeek, S. Tessaro, F. Tessarotto, F. Thibaud, S. Uhl, I. Uman, M. Vandenbroucke, M. Virius, J. Vondra, L. Wang, T. Weisrock, M. Wilfert, R. Windmolders, W. Wiślicki, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, N. Zhuravlev, and M. Ziembicki

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Meson, 010308 nuclear & particles physics, media_common.quotation_subject, Hadron, Elementary particle, Parton, 01 natural sciences, Asymmetry, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, media_common, Lepton
Abstract

COMPASS has studied exclusive production of ρ 0 mesons using a 160 GeV/ c muon beam and a transversely polarised NH 3 target. Five single-spin and three double-spin azimuthal aymmetries were measured in dependence on Q 2 , x Bj , or p T 2 . Except the sin ϕ S asymmetry, obtained to be − 0.019 ± 0.008( stat .) ± 0.003( syst .), all others were found to be consistent with zero within experimental uncertainties. Phenomenological GPD-based model calculations agree well with the data and interpret the result as evidence for the existence of chiral-odd, transverse generalised parton distributions.

Published
2014

35. Differential cross section for w boson production as a function of transverse momentum in p p̄ collisions at √s = 1.8 TeV

Author

V.M Abazov, B Abbott, A Abdesselam, M Abolins, V Abramov, B.S Acharya, D.L Adams, M Adams, S.N Ahmed, G.D Alexeev, G.A Alves, N Amos, E.W Anderson, M.M Baarmand, V.V Babintsev, L Babukhadia, T.C Bacon, A Baden, B Baldin, P.W Balm, S Banerjee, E Barberis, P Baringer, J Barreto, J.F Bartlett, U Bassler, D Bauer, A Bean, M Begel, A Belyaev, S.B Beri, G Bernardi, I Bertram, A Besson, R Beuselinck, V.A Bezzubov, P.C Bhat, V Bhatnagar, M Bhattacharjee, G Blazey, S Blessing, A Boehnlein, N.I Bojko, F Borcherding, K Bos, A Brandt, R Breedon, G Briskin, R Brock, G Brooijmans, A Bross, D Buchholz, M Buehler, V Buescher, V.S Burtovoi, J.M Butler, F Canelli, W Carvalho, D Casey, Z Casilum, H Castilla-Valdez, D Chakraborty, K.M Chan, S.V Chekulaev, D.K Cho, S Choi, S Chopra, J.H Christenson, M Chung, D Claes, A.R Clark, J Cochran, L Coney, B Connolly, W.E Cooper, D Coppage, M.A.C Cummings, D Cutts, G.A Davis, K Davis, K De, S.J de Jong, K Del Signore, M Demarteau, R Demina, P Demine, D Denisov, S.P Denisov, S Desai, H.T Diehl, M Diesburg, G Di Loreto, S Doulas, P Draper, Y Ducros, L.V Dudko, S Duensing, L Duflot, S.R Dugad, A Dyshkant, D Edmunds, J Ellison, V.D Elvira, R Engelmann, S Eno, G Eppley, P Ermolov, O.V Eroshin, J Estrada, H Evans, V.N Evdokimov, T Fahland, S Feher, D Fein, T Ferbel, F Filthaut, H.E Fisk, Y Fisyak, E Flattum, F Fleuret, M Fortner, K.C Frame, S Fuess, E Gallas, A.N Galyaev, M Gao, V Gavrilov, R.J Genik II, K Genser, C.E Gerber, Y Gershtein, R Gilmartin, G Ginther, B Gómez, G Gómez, P.I Goncharov, J.L González Solı́s, H Gordon, L.T Goss, K Gounder, A Goussiou, N Graf, G Graham, P.D Grannis, J.A Green, H Greenlee, S Grinstein, L Groer, S Grünendahl, A Gupta, S.N Gurzhiev, G Gutierrez, P Gutierrez, N.J Hadley, H Haggerty, S Hagopian, V Hagopian, R.E Hall, P Hanlet, S Hansen, J.M Hauptman, C Hays, C Hebert, D Hedin, A.P Heinson, U Heintz, T Heuring, M.D Hildreth, R Hirosky, J.D Hobbs, B Hoeneisen, Y Huang, R Illingworth, A.S Ito, M Jaffré, S Jain, R Jesik, K Johns, M Johnson, A Jonckheere, M Jones, H Jöstlein, A Juste, S Kahn, E Kajfasz, A.M Kalinin, D Karmanov, D Karmgard, R Kehoe, A Kharchilava, S.K Kim, B Klima, B Knuteson, W Ko, J.M Kohli, A.V Kostritskiy, J Kotcher, A.V Kotwal, A.V Kozelov, E.A Kozlovsky, J Krane, M.R Krishnaswamy, P Krivkova, S Krzywdzinski, M Kubantsev, S Kuleshov, Y Kulik, S Kunori, A Kupco, V.E Kuznetsov, G Landsberg, A Leflat, C Leggett, F Lehner, J Li, Q.Z Li, J.G.R Lima, D Lincoln, S.L Linn, J Linnemann, R Lipton, A Lucotte, L Lueking, C Lundstedt, C Luo, A.K.A Maciel, R.J Madaras, V.L Malyshev, V Manankov, H.S Mao, T Marshall, M.I Martin, R.D Martin, K.M Mauritz, B May, A.A Mayorov, R McCarthy, J McDonald, T McMahon, H.L Melanson, M Merkin, K.W Merritt, C Miao, H Miettinen, D Mihalcea, C.S Mishra, N Mokhov, N.K Mondal, H.E Montgomery, R.W Moore, M Mostafa, H da Motta, E Nagy, F Nang, M Narain, V.S Narasimham, H.A Neal, J.P Negret, S Negroni, T Nunnemann, D O'Neil, V Oguri, B Olivier, N Oshima, P Padley, L.J Pan, K Papageorgiou, A Para, N Parashar, R Partridge, N Parua, M Paterno, A Patwa, B Pawlik, J Perkins, M Peters, O Peters, P Pétroff, R Piegaia, H Piekarz, B.G Pope, E Popkov, H.B Prosper, S Protopopescu, J Qian, R Raja, S Rajagopalan, E Ramberg, P.A Rapidis, N.W Reay, S Reucroft, J Rha, M Ridel, M Rijssenbeek, T Rockwell, M Roco, P Rubinov, R Ruchti, J Rutherfoord, B.M Sabirov, A Santoro, L Sawyer, R.D Schamberger, H Schellman, A Schwartzman, N Sen, E Shabalina, R.K Shivpuri, D Shpakov, M Shupe, R.A Sidwell, V Simak, H Singh, J.B Singh, V Sirotenko, P Slattery, E Smith, R.P Smith, R Snihur, G.R Snow, J Snow, S Snyder, J Solomon, V Sorı́n, M Sosebee, N Sotnikova, K Soustruznik, M Souza, N.R Stanton, G Steinbrück, R.W Stephens, F Stichelbaut, D Stoker, V Stolin, D.A Stoyanova, M Strauss, M Strovink, L Stutte, A Sznajder, W Taylor, S Tentindo-Repond, S.M Tripathi, T.G Trippe, A.S Turcot, P.M Tuts, P van Gemmeren, V Vaniev, R Van Kooten, N Varelas, L.S Vertogradov, A.A Volkov, A.P Vorobiev, H.D Wahl, H Wang, Z.-M Wang, J Warchol, G Watts, M Wayne, H Weerts, A White, J.T White, D Whiteson, J.A Wightman, D.A Wijngaarden, S Willis, S.J Wimpenny, J Womersley, D.R Wood, R Yamada, P Yamin, T Yasuda, Y.A Yatsunenko, K Yip, S Youssef, J Yu, Z Yu, M Zanabria, H Zheng, Z Zhou, M Zielinski, D Zieminska, A Zieminski, V Zutshi, E.G Zverev, and A Zylberstejn

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Proton, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Tevatron, D0 experiment, 7. Clean energy, 01 natural sciences, law.invention, law, Antiproton, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Fermilab, Nuclear Experiment, 010306 general physics, Collider
Abstract

We report a measurement of the differential cross section for W boson production as a function of its transverse momentum in proton-antiproton collisions at √s = 1.8 TeV. The data were collected by the DØ experiment at the Fermilab Tevatron Collider during 1994-1995 and correspond to an integrated luminosity of 85 pb-1. The results are in good agreement with quantum chromodynamics over the entire range of transverse momentum. © 2001 Elsevier Science B.V.

Published
2016

36. Quark helicity distributions from longitudinal spin asymmetries in muon–proton and muon–deuteron scattering

Author

M.G. Alekseev, V.Yu. Alexakhin, Yu. Alexandrov, G.D. Alexeev, A. Amoroso, A. Austregesilo, B. Badełek, F. Balestra, J. Barth, G. Baum, Y. Bedfer, J. Bernhard, R. Bertini, M. Bettinelli, R. Birsa, J. Bisplinghoff, P. Bordalo, F. Bradamante, A. Bravar, A. Bressan, G. Brona, E. Burtin, M.P. Bussa, D. Chaberny, M. Chiosso, S.U. Chung, A. Cicuttin, M. Colantoni, M.L. Crespo, S. Dalla Torre, S. Das, S.S. Dasgupta, O.Yu. Denisov, L. Dhara, V. Diaz, S.V. Donskov, N. Doshita, V. Duic, W. Dünnweber, A. Efremov, A. El Alaoui, P.D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, H. Fischer, C. Franco, J.M. Friedrich, R. Garfagnini, F. Gautheron, O.P. Gavrichtchouk, R. Gazda, S. Gerassimov, R. Geyer, M. Giorgi, I. Gnesi, B. Gobbo, S. Goertz, S. Grabmüller, A. Grasso, B. Grube, R. Gushterski, A. Guskov, F. Haas, D. von Harrach, T. Hasegawa, F.H. Heinsius, F. Herrmann, C. Heß, F. Hinterberger, N. Horikawa, Ch. Höppner, N. d'Hose, C. Ilgner, S. Ishimoto, O. Ivanov, Yu. Ivanshin, T. Iwata, R. Jahn, P. Jasinski, G. Jegou, R. Joosten, E. Kabuß, D. Kang, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, Yu. Kisselev, F. Klein, K. Klimaszewski, S. Koblitz, J.H. Koivuniemi, V.N. Kolosov, K. Kondo, K. Königsmann, R. Konopka, I. Konorov, V.F. Konstantinov, A. Korzenev, A.M. Kotzinian, O. Kouznetsov, K. Kowalik, M. Krämer, A. Kral, Z.V. Kroumchtein, R. Kuhn, F. Kunne, K. Kurek, L. Lauser, J.M. Le Goff, A.A. Lednev, A. Lehmann, S. Levorato, J. Lichtenstadt, T. Liska, A. Maggiora, M. Maggiora, A. Magnon, N. Makke, G.K. Mallot, A. Mann, C. Marchand, A. Martin, J. Marzec, F. Massmann, T. Matsuda, W. Meyer, T. Michigami, Yu.V. Mikhailov, M.A. Moinester, A. Mutter, A. Nagaytsev, T. Nagel, J. Nassalski, T. Negrini, F. Nerling, S. Neubert, D. Neyret, V.I. Nikolaenko, A.S. Nunes, A.G. Olshevsky, M. Ostrick, A. Padee, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, B. Pawlukiewicz-Kaminska, E. Perevalova, G. Pesaro, D.V. Peshekhonov, G. Piragino, S. Platchkov, J. Pochodzalla, J. Polak, V.A. Polyakov, G. Pontecorvo, J. Pretz, C. Quintans, J.-F. Rajotte, S. Ramos, V. Rapatsky, G. Reicherz, A. Richter, F. Robinet, E. Rocco, E. Rondio, D.I. Ryabchikov, V.D. Samoylenko, A. Sandacz, H. Santos, M.G. Sapozhnikov, S. Sarkar, I.A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, L. Schmitt, S. Schopferer, W. Schröder, O.Yu. Shevchenko, H.-W. Siebert, L. Silva, L. Sinha, A.N. Sissakian, M. Slunecka, G.I. Smirnov, S. Sosio, F. Sozzi, A. Srnka, M. Stolarski, M. Sulc, R. Sulej, S. Takekawa, S. Tessaro, F. Tessarotto, A. Teufel, L.G. Tkatchev, S. Uhl, I. Uman, M. Virius, N.V. Vlassov, A. Vossen, Q. Weitzel, R. Windmolders, W. Wiślicki, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, J. Zhao, N. Zhuravlev, A. Zvyagin, M. G., Alekseev, Alexakhin, V. Y. u., Alexandrovo, Y. u., G. D., Alexeev, A., Amoroso, A., Austregesilo, B., Badełek, F., Balestra, J., Barth, G., Baum, Y., Bedfer, J., Bernhard, R., Bertini, M., Bettinelli, R., Birsa, J., Bisplinghoff, P., Bordalo, Bradamante, Franco, A., Bravar, Bressan, Andrea, G., Brona, E., Burtin, M. P., Bussa, D., Chaberny, M., Chiosso, S. U., Chung, A., Cicuttin, M., Colantoni, M. L., Crespo, S., Dalla Torre, S., Da, S. S., Dasgupta, Denisov, O. Y. u., L., Dhara, V., Diaz, S. V., Donskov, N., Doshita, Duic, Venicio, W., Dunnweber, A., Efremov, A., El Alaoui, P. D., Eversheim, W., Eyrich, M., Faessler, A., Ferrero, A., Filin, M., Finger, M. Finger J., R., H., Fischeri, C., Franco, J. M., Friedrich, R., Garfagnini, F., Gautheron, O. P., Gavrichtchouk, R., Gazda, S., Gerassimov, R., Geyer, Giorgi, Marcello, I., Gnesi, B., Gobbo, S., Goertz, S., Grabmuller, A., Grasso, B., Grube, R., Gushterski, A., Guskov, F., Haa, D., von Harrach, T., Hasegawa, F. H., Heinsiu, F., Herrmann, C., He, F., Hinterberger, N., Horikawa, Hoppner, C. h., N., D’Hose, C., Ilgnerj, S., Ishimoto, O., Ivanov, Ivanshin, Y. u., T., Iwata, R., Jahn, P., Jasinski, G., Jegou, R., Joosten, E., Kabu, D., Kang, B., Ketzer, G. V., Khaustov, Khokhlov, Y. u. A., Kisselev, Y. u., F., Klein, K., Klimaszewski, S., Koblitz, J. H., Koivuniemi, V. N., Kolosov, K., Kondo, K., Konigsmann, R., Konopka, I., Konorov, V. F., Konstantinov, A., Korzenev, A. M., Kotzinian, O., Kouznetsov, K., Kowalik, M., Kramer, A., Kral, Z. V., Kroumchtein, R., Kuhn, F., Kunne, K., Kurek, L., Lauseri, J. M., Le Goff, A. A., Lednev, A., Lehmann, Levorato, Stefano, J., Lichtenstadt, T., Liska, A., Maggiora, M., Maggiora, A., Magnon, N., Makke, G. K., Mallot, A., Mann, C., Marchand, Martin, Anna, J., Marzec, F., Massmann, T., Matsuda, W., Meyer, T., Michigami, Mikhailov, Y. u. V., M. A., Moinester, A., Mutteri, A., Nagaytsev, T., Nagel, J., Nassalski, T., Negrini, F., Nerling, S., Neubert, D., Neyret, V. I., Nikolaenko, A. S., Nune, A. G., Olshevsky, M., Ostrick, A., Padee, R., Panknin, D., Panzieri, B., Parsamyan, S., Paul, B., Pawlukiewicz Kaminska, E., Perevalova, Pesaro, Giulia, D. V., Peshekhonov, G., Piragino, S., Platchkov, J., Pochodzalla, J., Polak, V. A., Polyakov, G., Pontecorvo, J., Pretz, C., Quintan, J. F., Rajotte, S., Ramo, V., Rapatsky, G., Reicherz, A., Richter, F., Robinet, E., Rocco, E., Rondio, D. I., Ryabchikov, V. D., Samoylenko, A., Sandacz, H., Santo, M. G., Sapozhnikov, S., Sarkar, I. A., Savin, Sbrizzai, Giulio, Schiavon, Paolo, C., Schill, T., Schluter, L., Schmitt, S., Schopfereri, W., Schroder, Shevchenko, O. Y. u., H. W., Siebert, L., Silva, L., Sinha, A. N., Sissakian, M., Slunecka, G. I., Smirnov, S., Sosio, Sozzi, Federica, A., Srnka, M., Stolarskij, M., Sulc, R., Sulej, Takekawa, Stefano, S., Tessaro, F., Tessarotto, A., Teufel, L. G., Tkatchev, S., Uhl, I., Uman, M., Viriu, N. V., Vlassov, A., Vossen, Q., Weitzel, R., Windmolder, W., Wi´slicki, H., Wollny, K., Zaremba, M., Zavertyaev, E., Zemlyanichkina, M., Ziembicki, J., Zhao, N., Zhuravlev, and A., Zvyagin

Subjects
Quark, Nuclear and High Energy Physics, Proton, High Energy Physics::Lattice, media_common.quotation_subject, Nuclear Theory, FOS: Physical sciences, COMPASS, 01 natural sciences, Asymmetry, Semi-inclusive deep inelastic scattering, Spin, Structure function, Parton distribution functions, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, COMPASS experiment, Nuclear Experiment, 010306 general physics, Spin-½, media_common, Physics, function, Muon, 010308 nuclear & particles physics, Scattering, High Energy Physics::Phenomenology, Structure, Helicity, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

Double-spin asymmetries for production of charged pions and kaons in semi-inclusive deep-inelastic muon scattering have been measured by the COMPASS experiment at CERN. The data, obtained by scattering a 160 GeV muon beam off a longitudinally polarised NH_3 target, cover a range of the Bjorken variable x between 0.004 and 0.7. A leading order evaluation of the helicity distributions for the three lightest quarks and antiquark flavours derived from these asymmetries and from our previous deuteron data is presented. The resulting values of the sea quark distributions are small and do not show any sizable dependence on x in the range of the measurements. No significant difference is observed between the strange and antistrange helicity distributions, both compatible with zero. The integrated value of the flavour asymmetry of the helicity distribution of the light-quark sea, \Delta u-bar - \Delta d-bar, is found to be slightly positive, about 1.5 standard deviations away from zero., Comment: 13 pages, 5 figures

Published
2010

37. Search for the lightest scalar top quark in events with two leptons in pp¯ collisions at s=1.96 TeV

Author

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, T. Adams, E. Aguilo, S.H. Ahn, M. Ahsan, G.D. Alexeev, G. Alkhazov, A. Alton, G. Alverson, G.A. Alves, M. Anastasoaie, L.S. Ancu, T. Andeen, S. Anderson, B. Andrieu, M.S. Anzelc, Y. Arnoud, M. Arov, M. Arthaud, A. Askew, B. Åsman, A.C.S. Assis Jesus, O. Atramentov, C. Autermann, C. Avila, C. Ay, F. Badaud, A. Baden, L. Bagby, B. Baldin, D.V. Bandurin, S. Banerjee, P. Banerjee, E. Barberis, A.-F. Barfuss, P. Bargassa, P. Baringer, J. Barreto, J.F. Bartlett, U. Bassler, D. Bauer, S. Beale, A. Bean, M. Begalli, M. Begel, C. Belanger-Champagne, L. Bellantoni, A. Bellavance, J.A. Benitez, S.B. Beri, G. Bernardi, R. Bernhard, L. Berntzon, I. Bertram, M. Besançon, R. Beuselinck, V.A. Bezzubov, P.C. Bhat, V. Bhatnagar, C. Biscarat, G. Blazey, F. Blekman, S. Blessing, D. Bloch, K. Bloom, A. Boehnlein, D. Boline, T.A. Bolton, G. Borissov, K. Bos, T. Bose, A. Brandt, R. Brock, G. Brooijmans, A. Bross, D. Brown, N.J. Buchanan, D. Buchholz, M. Buehler, V. Buescher, S. Burdin, S. Burke, T.H. Burnett, C.P. Buszello, J.M. Butler, P. Calfayan, S. Calvet, J. Cammin, S. Caron, W. Carvalho, B.C.K. Casey, N.M. Cason, H. Castilla-Valdez, S. Chakrabarti, D. Chakraborty, K.M. Chan, K. Chan, A. Chandra, F. Charles, E. Cheu, F. Chevallier, D.K. Cho, S. Choi, B. Choudhary, L. Christofek, T. Christoudias, S. Cihangir, D. Claes, B. Clément, Y. Coadou, M. Cooke, W.E. Cooper, M. Corcoran, F. Couderc, M.-C. Cousinou, S. Crépé-Renaudin, D. Cutts, M. Ćwiok, H. da Motta, A. Das, G. Davies, K. De, S.J. de Jong, P. de Jong, E. De La Cruz-Burelo, C. De Oliveira Martins, J.D. Degenhardt, F. Déliot, M. Demarteau, R. Demina, D. Denisov, S.P. Denisov, S. Desai, H.T. Diehl, M. Diesburg, A. Dominguez, H. Dong, L.V. Dudko, L. Duflot, S.R. Dugad, D. Duggan, A. Duperrin, J. Dyer, A. Dyshkant, M. Eads, D. Edmunds, J. Ellison, V.D. Elvira, Y. Enari, S. Eno, P. Ermolov, H. Evans, A. Evdokimov, V.N. Evdokimov, A.V. Ferapontov, T. Ferbel, F. Fiedler, F. Filthaut, W. Fisher, H.E. Fisk, M. Ford, M. Fortner, H. Fox, S. Fu, S. Fuess, T. Gadfort, C.F. Galea, E. Gallas, E. Galyaev, C. Garcia, A. Garcia-Bellido, V. Gavrilov, P. Gay, W. Geist, D. Gelé, C.E. Gerber, Y. Gershtein, D. Gillberg, G. Ginther, N. Gollub, B. Gómez, A. Goussiou, P.D. Grannis, H. Greenlee, Z.D. Greenwood, E.M. Gregores, G. Grenier, Ph. Gris, J.-F. Grivaz, A. Grohsjean, S. Grünendahl, M.W. Grünewald, J. Guo, F. Guo, P. Gutierrez, G. Gutierrez, A. Haas, N.J. Hadley, P. Haefner, S. Hagopian, J. Haley, I. Hall, R.E. Hall, L. Han, K. Hanagaki, P. Hansson, K. Harder, A. Harel, R. Harrington, J.M. Hauptman, R. Hauser, J. Hays, T. Hebbeker, D. Hedin, J.G. Hegeman, J.M. Heinmiller, A.P. Heinson, U. Heintz, C. Hensel, K. Herner, G. Hesketh, M.D. Hildreth, R. Hirosky, J.D. Hobbs, B. Hoeneisen, H. Hoeth, M. Hohlfeld, S.J. Hong, R. Hooper, S. Hossain, P. Houben, Y. Hu, Z. Hubacek, V. Hynek, I. Iashvili, R. Illingworth, A.S. Ito, S. Jabeen, M. Jaffré, S. Jain, K. Jakobs, C. Jarvis, R. Jesik, K. Johns, C. Johnson, M. Johnson, A. Jonckheere, P. Jonsson, A. Juste, D. Käfer, S. Kahn, E. Kajfasz, A.M. Kalinin, J.R. Kalk, J.M. Kalk, S. Kappler, D. Karmanov, J. Kasper, P. Kasper, I. Katsanos, D. Kau, R. Kaur, V. Kaushik, R. Kehoe, S. Kermiche, N. Khalatyan, A. Khanov, A. Kharchilava, Y.M. Kharzheev, D. Khatidze, H. Kim, T.J. Kim, M.H. Kirby, M. Kirsch, B. Klima, J.M. Kohli, J.-P. Konrath, M. Kopal, V.M. Korablev, A.V. Kozelov, D. Krop, A. Kryemadhi, T. Kuhl, A. Kumar, S. Kunori, A. Kupco, T. Kurča, J. Kvita, F. Lacroix, D. Lam, S. Lammers, G. Landsberg, J. Lazoflores, P. Lebrun, W.M. Lee, A. Leflat, F. Lehner, J. Lellouch, J. Leveque, P. Lewis, J. Li, Q.Z. Li, L. Li, S.M. Lietti, J.G.R. Lima, D. Lincoln, J. Linnemann, V.V. Lipaev, R. Lipton, Y. Liu, Z. Liu, L. Lobo, A. Lobodenko, M. Lokajicek, A. Lounis, P. Love, H.J. Lubatti, A.L. Lyon, A.K.A. Maciel, D. Mackin, R.J. Madaras, P. Mättig, C. Magass, A. Magerkurth, N. Makovec, P.K. Mal, H.B. Malbouisson, S. Malik, V.L. Malyshev, H.S. Mao, Y. Maravin, B. Martin, R. McCarthy, A. Melnitchouk, A. Mendes, L. Mendoza, P.G. Mercadante, M. Merkin, K.W. Merritt, J. Meyer, A. Meyer, M. Michaut, T. Millet, J. Mitrevski, J. Molina, R.K. Mommsen, N.K. Mondal, R.W. Moore, T. Moulik, G.S. Muanza, M. Mulders, M. Mulhearn, O. Mundal, L. Mundim, E. Nagy, M. Naimuddin, M. Narain, N.A. Naumann, H.A. Neal, J.P. Negret, P. Neustroev, H. Nilsen, A. Nomerotski, S.F. Novaes, T. Nunnemann, V. O'Dell, D.C. O'Neil, G. Obrant, C. Ochando, D. Onoprienko, N. Oshima, J. Osta, R. Otec, G.J. Otero y Garzón, M. Owen, P. Padley, M. Pangilinan, N. Parashar, S.-J. Park, S.K. Park, J. Parsons, R. Partridge, N. Parua, A. Patwa, G. Pawloski, B. Penning, K. Peters, Y. Peters, P. Pétroff, M. Petteni, R. Piegaia, J. Piper, M.-A. Pleier, P.L.M. Podesta-Lerma, V.M. Podstavkov, Y. Pogorelov, M.-E. Pol, P. Polozov, A. Pompoš, B.G. Pope, A.V. Popov, C. Potter, W.L. Prado da Silva, H.B. Prosper, S. Protopopescu, J. Qian, A. Quadt, B. Quinn, A. Rakitine, M.S. Rangel, K. Ranjan, P.N. Ratoff, P. Renkel, S. Reucroft, P. Rich, M. Rijssenbeek, I. Ripp-Baudot, F. Rizatdinova, S. Robinson, R.F. Rodrigues, C. Royon, P. Rubinov, R. Ruchti, G. Safronov, G. Sajot, A. Sánchez-Hernández, M.P. Sanders, A. Santoro, G. Savage, L. Sawyer, T. Scanlon, D. Schaile, R.D. Schamberger, Y. Scheglov, H. Schellman, P. Schieferdecker, T. Schliephake, C. Schwanenberger, A. Schwartzman, R. Schwienhorst, J. Sekaric, S. Sengupta, H. Severini, E. Shabalina, M. Shamim, V. Shary, A.A. Shchukin, R.K. Shivpuri, D. Shpakov, V. Siccardi, V. Simak, V. Sirotenko, P. Skubic, P. Slattery, D. Smirnov, J. Snow, G.R. Snow, S. Snyder, S. Söldner-Rembold, L. Sonnenschein, A. Sopczak, M. Sosebee, K. Soustruznik, M. Souza, B. Spurlock, J. Stark, J. Steele, V. Stolin, A. Stone, D.A. Stoyanova, J. Strandberg, S. Strandberg, M.A. Strang, M. Strauss, E. Strauss, R. Ströhmer, D. Strom, L. Stutte, S. Sumowidagdo, P. Svoisky, A. Sznajder, M. Talby, P. Tamburello, A. Tanasijczuk, W. Taylor, P. Telford, J. Temple, B. Tiller, F. Tissandier, M. Titov, V.V. Tokmenin, T. Toole, I. Torchiani, T. Trefzger, D. Tsybychev, B. Tuchming, C. Tully, P.M. Tuts, R. Unalan, S. Uvarov, L. Uvarov, S. Uzunyan, B. Vachon, P.J. van den Berg, B. van Eijk, R. Van Kooten, W.M. van Leeuwen, N. Varelas, E.W. Varnes, I.A. Vasilyev, M. Vaupel, P. Verdier, L.S. Vertogradov, M. Verzocchi, F. Villeneuve-Seguier, P. Vint, P. Vokac, E. Von Toerne, M. Voutilainen, M. Vreeswijk, R. Wagner, H.D. Wahl, L. Wang, M.H.L.S. Wang, J. Warchol, G. Watts, M. Wayne, M. Weber, G. Weber, A. Wenger, N. Wermes, M. Wetstein, A. White, D. Wicke, G.W. Wilson, S.J. Wimpenny, M. Wobisch, D.R. Wood, T.R. Wyatt, Y. Xie, S. Yacoob, R. Yamada, M. Yan, T. Yasuda, Y.A. Yatsunenko, K. Yip, H.D. Yoo, S.W. Youn, J. Yu, A. Zatserklyaniy, C. Zeitnitz, D. Zhang, T. Zhao, B. Zhou, J. Zhu, M. Zielinski, D. Zieminska, A. Zieminski, L. Zivkovic, V. Zutshi, and E.G. Zverev

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Top quark, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Tevatron, Elementary particle, 7. Clean energy, 01 natural sciences, Bottom quark, Nuclear physics, Pair production, 0103 physical sciences, High Energy Physics::Experiment, Fermilab, Neutrino, 010306 general physics, Lepton, Minimal Supersymmetric Standard Model
Abstract

We report results of a search for the pair production of the lightest supersymmetric partner of the top quark, t ˜ 1 , using a data set corresponding to an integrated luminosity of 1 fb −1 collected by the DO detector at a p p ¯ center-of-mass energy of 1.96 TeV at the Fermilab Tevatron collider. Both scalar top quarks are assumed to decay into a b quark, a charged lepton and a scalar neutrino. The search is performed in the electron plus muon and dielectron final states. The signal topology consists of two isolated leptons, missing transverse energy, and jets. We find no evidence for this process and exclude regions of parameter space in the framework of the minimal supersymmetric standard model.

Published
2009

38. Erratum to: 'Search for particles decaying into a Z boson and a photon in pp¯ collisions at s=1.96 TeV' [Phys. Lett. B 641 (2006) 415]

Author

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, T. Adams, M. Agelou, J.-L. Agram, S.H. Ahn, M. Ahsan, G.D. Alexeev, G. Alkhazov, A. Alton, G. Alverson, G.A. Alves, M. Anastasoaie, T. Andeen, S. Anderson, B. Andrieu, M.S. Anzelc, Y. Arnoud, M. Arov, A. Askew, B. Åsman, A.C.S. Assis Jesus, O. Atramentov, C. Autermann, C. Avila, C. Ay, F. Badaud, A. Baden, L. Bagby, B. Baldin, D.V. Bandurin, P. Banerjee, S. Banerjee, E. Barberis, P. Bargassa, P. Baringer, C. Barnes, J. Barreto, J.F. Bartlett, U. Bassler, D. Bauer, A. Bean, M. Begalli, M. Begel, C. Belanger-Champagne, L. Bellantoni, A. Bellavance, J.A. Benitez, S.B. Beri, G. Bernardi, R. Bernhard, L. Berntzon, I. Bertram, M. Besançon, R. Beuselinck, V.A. Bezzubov, P.C. Bhat, V. Bhatnagar, M. Binder, C. Biscarat, K.M. Black, I. Blackler, G. Blazey, F. Blekman, S. Blessing, D. Bloch, K. Bloom, U. Blumenschein, A. Boehnlein, O. Boeriu, T.A. Bolton, F. Borcherding, G. Borissov, K. Bos, T. Bose, A. Brandt, R. Brock, G. Brooijmans, A. Bross, D. Brown, N.J. Buchanan, D. Buchholz, M. Buehler, V. Buescher, S. Burdin, S. Burke, T.H. Burnett, E. Busato, C.P. Buszello, J.M. Butler, P. Calfayan, S. Calvet, J. Cammin, S. Caron, W. Carvalho, B.C.K. Casey, N.M. Cason, H. Castilla-Valdez, S. Chakrabarti, D. Chakraborty, K.M. Chan, A. Chandra, D. Chapin, F. Charles, E. Cheu, F. Chevallier, D.K. Cho, S. Choi, B. Choudhary, L. Christofek, D. Claes, B. Clément, C. Clément, Y. Coadou, M. Cooke, W.E. Cooper, D. Coppage, M. Corcoran, M.-C. Cousinou, B. Cox, S. Crépé-Renaudin, D. Cutts, M. Ćwiok, H. da Motta, A. Das, M. Das, B. Davies, G. Davies, G.A. Davis, K. De, P. de Jong, S.J. de Jong, E. De La Cruz-Burelo, C. De Oliveira Martins, J.D. Degenhardt, F. Déliot, M. Demarteau, R. Demina, P. Demine, D. Denisov, S.P. Denisov, S. Desai, H.T. Diehl, M. Diesburg, M. Doidge, A. Dominguez, H. Dong, L.V. Dudko, L. Duflot, S.R. Dugad, A. Duperrin, J. Dyer, A. Dyshkant, M. Eads, D. Edmunds, T. Edwards, J. Ellison, J. Elmsheuser, V.D. Elvira, S. Eno, P. Ermolov, J. Estrada, H. Evans, A. Evdokimov, V.N. Evdokimov, S.N. Fatakia, L. Feligioni, A.V. Ferapontov, T. Ferbel, F. Fiedler, F. Filthaut, W. Fisher, H.E. Fisk, I. Fleck, M. Ford, M. Fortner, H. Fox, S. Fu, S. Fuess, T. Gadfort, C.F. Galea, E. Gallas, E. Galyaev, C. Garcia, A. Garcia-Bellido, J. Gardner, V. Gavrilov, A. Gay, P. Gay, D. Gelé, R. Gelhaus, C.E. Gerber, Y. Gershtein, D. Gillberg, G. Ginther, N. Gollub, B. Gómez, K. Gounder, A. Goussiou, P.D. Grannis, H. Greenlee, Z.D. Greenwood, E.M. Gregores, G. Grenier, Ph. Gris, J.-F. Grivaz, S. Grünendahl, M.W. Grünewald, F. Guo, J. Guo, G. Gutierrez, P. Gutierrez, A. Haas, N.J. Hadley, P. Haefner, S. Hagopian, J. Haley, I. Hall, R.E. Hall, L. Han, K. Hanagaki, K. Harder, A. Harel, R. Harrington, J.M. Hauptman, R. Hauser, J. Hays, T. Hebbeker, D. Hedin, J.G. Hegeman, J.M. Heinmiller, A.P. Heinson, U. Heintz, C. Hensel, G. Hesketh, M.D. Hildreth, R. Hirosky, J.D. Hobbs, B. Hoeneisen, H. Hoeth, M. Hohlfeld, S.J. Hong, R. Hooper, P. Houben, Y. Hu, Z. Hubacek, V. Hynek, I. Iashvili, R. Illingworth, A.S. Ito, S. Jabeen, M. Jaffré, S. Jain, K. Jakobs, C. Jarvis, A. Jenkins, R. Jesik, K. Johns, C. Johnson, M. Johnson, A. Jonckheere, P. Jonsson, A. Juste, D. Käfer, S. Kahn, E. Kajfasz, A.M. Kalinin, J.M. Kalk, J.R. Kalk, S. Kappler, D. Karmanov, J. Kasper, P. Kasper, I. Katsanos, D. Kau, R. Kaur, R. Kehoe, S. Kermiche, S. Kesisoglou, N. Khalatyan, A. Khanov, A. Kharchilava, Y.M. Kharzheev, D. Khatidze, H. Kim, T.J. Kim, M.H. Kirby, B. Klima, J.M. Kohli, J.-P. Konrath, M. Kopal, V.M. Korablev, J. Kotcher, B. Kothari, A. Koubarovsky, A.V. Kozelov, J. Kozminski, A. Kryemadhi, S. Krzywdzinski, T. Kuhl, A. Kumar, S. Kunori, A. Kupco, T. Kurča, J. Kvita, S. Lager, S. Lammers, G. Landsberg, J. Lazoflores, A.-C. Le Bihan, P. Lebrun, W.M. Lee, A. Leflat, F. Lehner, V. Lesne, J. Leveque, P. Lewis, J. Li, Q.Z. Li, J.G.R. Lima, D. Lincoln, J. Linnemann, V.V. Lipaev, R. Lipton, Z. Liu, L. Lobo, A. Lobodenko, M. Lokajicek, A. Lounis, P. Love, H.J. Lubatti, M. Lynker, A.L. Lyon, A.K.A. Maciel, R.J. Madaras, P. Mättig, C. Magass, A. Magerkurth, A.-M. Magnan, N. Makovec, P.K. Mal, H.B. Malbouisson, S. Malik, V.L. Malyshev, H.S. Mao, Y. Maravin, M. Martens, S.E.K. Mattingly, R. McCarthy, R. McCroskey, D. Meder, A. Melnitchouk, A. Mendes, L. Mendoza, M. Merkin, K.W. Merritt, A. Meyer, J. Meyer, M. Michaut, H. Miettinen, T. Millet, J. Mitrevski, J. Molina, N.K. Mondal, J. Monk, R.W. Moore, T. Moulik, G.S. Muanza, M. Mulders, M. Mulhearn, L. Mundim, Y.D. Mutaf, E. Nagy, M. Naimuddin, M. Narain, N.A. Naumann, H.A. Neal, J.P. Negret, S. Nelson, P. Neustroev, C. Noeding, A. Nomerotski, S.F. Novaes, T. Nunnemann, V. O'Dell, D.C. O'Neil, G. Obrant, V. Oguri, N. Oliveira, N. Oshima, R. Otec, G.J. Otero y Garzón, M. Owen, P. Padley, N. Parashar, S.-J. Park, S.K. Park, J. Parsons, R. Partridge, N. Parua, A. Patwa, G. Pawloski, P.M. Perea, E. Perez, K. Peters, P. Pétroff, M. Petteni, R. Piegaia, M.-A. Pleier, P.L.M. Podesta-Lerma, V.M. Podstavkov, Y. Pogorelov, M.-E. Pol, A. Pompoš, B.G. Pope, A.V. Popov, W.L. Prado da Silva, H.B. Prosper, S. Protopopescu, J. Qian, A. Quadt, B. Quinn, K.J. Rani, K. Ranjan, P.A. Rapidis, P.N. Ratoff, P. Renkel, S. Reucroft, M. Rijssenbeek, I. Ripp-Baudot, F. Rizatdinova, S. Robinson, R.F. Rodrigues, C. Royon, P. Rubinov, R. Ruchti, V.I. Rud, G. Sajot, A. Sánchez-Hernández, M.P. Sanders, A. Santoro, G. Savage, L. Sawyer, T. Scanlon, D. Schaile, R.D. Schamberger, Y. Scheglov, H. Schellman, P. Schieferdecker, C. Schmitt, C. Schwanenberger, A. Schwartzman, R. Schwienhorst, S. Sengupta, H. Severini, E. Shabalina, M. Shamim, V. Shary, A.A. Shchukin, W.D. Shephard, R.K. Shivpuri, D. Shpakov, V. Siccardi, R.A. Sidwell, V. Simak, V. Sirotenko, P. Skubic, P. Slattery, R.P. Smith, G.R. Snow, J. Snow, S. Snyder, S. Söldner-Rembold, X. Song, L. Sonnenschein, A. Sopczak, M. Sosebee, K. Soustruznik, M. Souza, B. Spurlock, J. Stark, J. Steele, K. Stevenson, V. Stolin, A. Stone, D.A. Stoyanova, J. Strandberg, M.A. Strang, M. Strauss, R. Ströhmer, D. Strom, M. Strovink, L. Stutte, S. Sumowidagdo, A. Sznajder, M. Talby, P. Tamburello, W. Taylor, P. Telford, J. Temple, B. Tiller, M. Titov, V.V. Tokmenin, M. Tomoto, T. Toole, I. Torchiani, S. Towers, T. Trefzger, S. Trincaz-Duvoid, D. Tsybychev, B. Tuchming, C. Tully, A.S. Turcot, P.M. Tuts, R. Unalan, L. Uvarov, S. Uvarov, S. Uzunyan, B. Vachon, P.J. van den Berg, R. Van Kooten, W.M. van Leeuwen, N. Varelas, E.W. Varnes, A. Vartapetian, I.A. Vasilyev, M. Vaupel, P. Verdier, L.S. Vertogradov, M. Verzocchi, F. Villeneuve-Seguier, P. Vint, J.-R. Vlimant, E. Von Toerne, M. Voutilainen, M. Vreeswijk, H.D. Wahl, L. Wang, J. Warchol, G. Watts, M. Wayne, M. Weber, H. Weerts, N. Wermes, M. Wetstein, A. White, D. Wicke, G.W. Wilson, S.J. Wimpenny, M. Wobisch, J. Womersley, D.R. Wood, T.R. Wyatt, Y. Xie, N. Xuan, S. Yacoob, R. Yamada, M. Yan, T. Yasuda, Y.A. Yatsunenko, K. Yip, H.D. Yoo, S.W. Youn, C. Yu, J. Yu, A. Yurkewicz, A. Zatserklyaniy, C. Zeitnitz, D. Zhang, T. Zhao, Z. Zhao, B. Zhou, J. Zhu, M. Zielinski, D. Zieminska, A. Zieminski, V. Zutshi, and E.G. Zverev

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, 0103 physical sciences, High Energy Physics::Experiment, 010303 astronomy & astrophysics, 01 natural sciences
Abstract

Search for particles decaying into a Z boson and a photon in collisions p (p)over-bar at root s = 1.96 TeV (vol 641, pg 415, 2006)

Published
2009

39. Search for a scalar or vector particle decaying into Zγ in pp¯ collisions at s=1.96 TeV

Author

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, T. Adams, E. Aguilo, M. Ahsan, G.D. Alexeev, G. Alkhazov, A. Alton, G. Alverson, G.A. Alves, M. Anastasoaie, L.S. Ancu, T. Andeen, S. Anderson, B. Andrieu, M.S. Anzelc, M. Aoki, Y. Arnoud, M. Arov, M. Arthaud, A. Askew, B. Åsman, A.C.S. Assis Jesus, O. Atramentov, R. Averin, C. Avila, F. Badaud, L. Bagby, B. Baldin, D.V. Bandurin, P. Banerjee, S. Banerjee, E. Barberis, A.-F. Barfuss, P. Bargassa, P. Baringer, J. Barreto, J.F. Bartlett, U. Bassler, D. Bauer, S. Beale, A. Bean, M. Begalli, M. Begel, C. Belanger-Champagne, L. Bellantoni, A. Bellavance, J.A. Benitez, S.B. Beri, G. Bernardi, R. Bernhard, I. Bertram, M. Besançon, R. Beuselinck, V.A. Bezzubov, P.C. Bhat, V. Bhatnagar, C. Biscarat, G. Blazey, F. Blekman, S. Blessing, D. Bloch, K. Bloom, A. Boehnlein, D. Boline, T.A. Bolton, E.E. Boos, G. Borissov, T. Bose, A. Brandt, R. Brock, G. Brooijmans, A. Bross, D. Brown, X.B. Bu, N.J. Buchanan, D. Buchholz, M. Buehler, V. Buescher, V. Bunichev, S. Burdin, T.H. Burnett, C.P. Buszello, J.M. Butler, P. Calfayan, S. Calvet, J. Cammin, W. Carvalho, B.C.K. Casey, H. Castilla-Valdez, S. Chakrabarti, D. Chakraborty, K. Chan, K.M. Chan, A. Chandra, F. Charles, E. Cheu, F. Chevallier, D.K. Cho, S. Choi, B. Choudhary, L. Christofek, T. Christoudias, S. Cihangir, D. Claes, J. Clutter, M. Cooke, W.E. Cooper, M. Corcoran, F. Couderc, M.-C. Cousinou, S. Crépé-Renaudin, V. Cuplov, D. Cutts, M. Ćwiok, H. da Motta, A. Das, G. Davies, K. De, S.J. de Jong, E. De La Cruz-Burelo, C. De Oliveira Martins, J.D. Degenhardt, F. Déliot, M. Demarteau, R. Demina, D. Denisov, S.P. Denisov, S. Desai, H.T. Diehl, M. Diesburg, A. Dominguez, H. Dong, L.V. Dudko, L. Duflot, S.R. Dugad, D. Duggan, A. Duperrin, J. Dyer, A. Dyshkant, M. Eads, D. Edmunds, J. Ellison, V.D. Elvira, Y. Enari, S. Eno, P. Ermolov, H. Evans, A. Evdokimov, V.N. Evdokimov, A.V. Ferapontov, T. Ferbel, F. Fiedler, F. Filthaut, W. Fisher, H.E. Fisk, M. Fortner, H. Fox, S. Fu, S. Fuess, T. Gadfort, C.F. Galea, E. Gallas, C. Garcia, A. Garcia-Bellido, V. Gavrilov, P. Gay, W. Geist, D. Gelé, C.E. Gerber, Y. Gershtein, D. Gillberg, G. Ginther, N. Gollub, B. Gómez, A. Goussiou, P.D. Grannis, H. Greenlee, Z.D. Greenwood, E.M. Gregores, G. Grenier, Ph. Gris, J.-F. Grivaz, A. Grohsjean, S. Grünendahl, M.W. Grünewald, F. Guo, J. Guo, G. Gutierrez, P. Gutierrez, A. Haas, N.J. Hadley, P. Haefner, S. Hagopian, J. Haley, I. Hall, R.E. Hall, L. Han, K. Harder, A. Harel, J.M. Hauptman, R. Hauser, J. Hays, T. Hebbeker, D. Hedin, J.G. Hegeman, A.P. Heinson, U. Heintz, C. Hensel, K. Herner, G. Hesketh, M.D. Hildreth, R. Hirosky, J.D. Hobbs, B. Hoeneisen, H. Hoeth, M. Hohlfeld, S. Hossain, P. Houben, Y. Hu, Z. Hubacek, V. Hynek, I. Iashvili, R. Illingworth, A.S. Ito, S. Jabeen, M. Jaffré, S. Jain, K. Jakobs, C. Jarvis, R. Jesik, K. Johns, C. Johnson, M. Johnson, A. Jonckheere, P. Jonsson, A. Juste, E. Kajfasz, J.M. Kalk, D. Karmanov, P.A. Kasper, I. Katsanos, D. Kau, V. Kaushik, R. Kehoe, S. Kermiche, N. Khalatyan, A. Khanov, A. Kharchilava, Y.M. Kharzheev, D. Khatidze, T.J. Kim, M.H. Kirby, M. Kirsch, B. Klima, J.M. Kohli, J.-P. Konrath, A.V. Kozelov, J. Kraus, T. Kuhl, A. Kumar, A. Kupco, T. Kurča, V.A. Kuzmin, J. Kvita, F. Lacroix, D. Lam, S. Lammers, G. Landsberg, P. Lebrun, W.M. Lee, A. Leflat, J. Lellouch, J. Li, L. Li, Q.Z. Li, S.M. Lietti, J.G.R. Lima, D. Lincoln, J. Linnemann, V.V. Lipaev, R. Lipton, Y. Liu, Z. Liu, A. Lobodenko, M. Lokajicek, P. Love, H.J. Lubatti, R. Luna, A.L. Lyon, A.K.A. Maciel, D. Mackin, R.J. Madaras, P. Mättig, C. Magass, A. Magerkurth, P.K. Mal, H.B. Malbouisson, S. Malik, V.L. Malyshev, H.S. Mao, Y. Maravin, B. Martin, R. McCarthy, A. Melnitchouk, L. Mendoza, P.G. Mercadante, M. Merkin, K.W. Merritt, A. Meyer, J. Meyer, T. Millet, J. Mitrevski, R.K. Mommsen, N.K. Mondal, R.W. Moore, T. Moulik, G.S. Muanza, M. Mulhearn, O. Mundal, L. Mundim, E. Nagy, M. Naimuddin, M. Narain, N.A. Naumann, H.A. Neal, J.P. Negret, P. Neustroev, H. Nilsen, H. Nogima, S.F. Novaes, T. Nunnemann, V. O'Dell, D.C. O'Neil, G. Obrant, C. Ochando, D. Onoprienko, N. Oshima, N. Osman, J. Osta, R. Otec, G.J. Otero y Garzón, M. Owen, P. Padley, M. Pangilinan, N. Parashar, S.-J. Park, S.K. Park, J. Parsons, R. Partridge, N. Parua, A. Patwa, G. Pawloski, B. Penning, M. Perfilov, K. Peters, Y. Peters, P. Pétroff, M. Petteni, R. Piegaia, J. Piper, M.-A. Pleier, P.L.M. Podesta-Lerma, V.M. Podstavkov, Y. Pogorelov, M.-E. Pol, P. Polozov, B.G. Pope, A.V. Popov, C. Potter, W.L. Prado da Silva, H.B. Prosper, S. Protopopescu, J. Qian, A. Quadt, B. Quinn, A. Rakitine, M.S. Rangel, K. Ranjan, P.N. Ratoff, P. Renkel, S. Reucroft, P. Rich, J. Rieger, M. Rijssenbeek, I. Ripp-Baudot, F. Rizatdinova, S. Robinson, R.F. Rodrigues, M. Rominsky, C. Royon, P. Rubinov, R. Ruchti, G. Safronov, G. Sajot, A. Sánchez-Hernández, M.P. Sanders, B. Sanghi, G. Savage, L. Sawyer, T. Scanlon, D. Schaile, R.D. Schamberger, Y. Scheglov, H. Schellman, T. Schliephake, C. Schwanenberger, A. Schwartzman, R. Schwienhorst, J. Sekaric, H. Severini, E. Shabalina, M. Shamim, V. Shary, A.A. Shchukin, R.K. Shivpuri, V. Siccardi, V. Simak, V. Sirotenko, P. Skubic, P. Slattery, D. Smirnov, G.R. Snow, J. Snow, S. Snyder, S. Söldner-Rembold, L. Sonnenschein, A. Sopczak, M. Sosebee, K. Soustruznik, B. Spurlock, J. Stark, J. Steele, V. Stolin, D.A. Stoyanova, J. Strandberg, S. Strandberg, M.A. Strang, E. Strauss, M. Strauss, R. Ströhmer, D. Strom, L. Stutte, S. Sumowidagdo, P. Svoisky, A. Sznajder, P. Tamburello, A. Tanasijczuk, W. Taylor, B. Tiller, F. Tissandier, M. Titov, V.V. Tokmenin, T. Toole, I. Torchiani, T. Trefzger, D. Tsybychev, B. Tuchming, C. Tully, P.M. Tuts, R. Unalan, L. Uvarov, S. Uvarov, S. Uzunyan, B. Vachon, P.J. van den Berg, R. Van Kooten, W.M. van Leeuwen, N. Varelas, E.W. Varnes, I.A. Vasilyev, M. Vaupel, P. Verdier, L.S. Vertogradov, M. Verzocchi, F. Villeneuve-Seguier, P. Vint, P. Vokac, E. Von Toerne, M. Voutilainen, R. Wagner, H.D. Wahl, L. Wang, M.H.L.S. Wang, J. Warchol, G. Watts, M. Wayne, G. Weber, M. Weber, L. Welty-Rieger, A. Wenger, N. Wermes, M. Wetstein, A. White, D. Wicke, G.W. Wilson, S.J. Wimpenny, M. Wobisch, D.R. Wood, T.R. Wyatt, Y. Xie, S. Yacoob, R. Yamada, T. Yasuda, Y.A. Yatsunenko, H. Yin, K. Yip, H.D. Yoo, S.W. Youn, J. Yu, C. Zeitnitz, T. Zhao, B. Zhou, J. Zhu, M. Zielinski, D. Zieminska, A. Zieminski, L. Zivkovic, V. Zutshi, and E.G. Zverev

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Muon, 010308 nuclear & particles physics, Branching fraction, Scalar (mathematics), Tevatron, Electron, 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Fermilab, 010306 general physics, Boson
Abstract

We present a search for a narrow scalar or vector resonance decaying into Z gamma with a subsequent Z boson decay into a pair of electrons or moons. The data for this search were collected with the D circle divide detecror at the Fermilab Tevatron p (p) over bar collider at a center of mass energy root s = 1.96 TeV. Using 1.1 (1.0) fb(-1) of data, we observe 49 (50) candidate events in the electron (muon) channel, in good agreement with the standard model prediction. From the combination of both channels, we derive 95% C.L. upper limits on the cross section times branching fraction (sigma x B) into Z gamma. These limits range from 0.19 (0.20) pb for a scalar (vector) resonance mass of 600 GeV/c(2) to 2.5 (3.1) pb for a mass of 140 GeV/c(2).

Published
2009

40. Search for tt¯ resonances in the lepton plus jets final state in pp¯ collisions at s=1.96TeV

Author

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, T. Adams, E. Aguilo, S.H. Ahn, M. Ahsan, G.D. Alexeev, G. Alkhazov, A. Alton, G. Alverson, G.A. Alves, M. Anastasoaie, L.S. Ancu, T. Andeen, S. Anderson, B. Andrieu, M.S. Anzelc, M. Aoki, Y. Arnoud, M. Arov, M. Arthaud, A. Askew, B. Åsman, A.C.S. Assis Jesus, O. Atramentov, C. Avila, F. Badaud, A. Baden, L. Bagby, B. Baldin, D.V. Bandurin, P. Banerjee, S. Banerjee, E. Barberis, A.-F. Barfuss, P. Bargassa, P. Baringer, J. Barreto, J.F. Bartlett, U. Bassler, D. Bauer, S. Beale, A. Bean, M. Begalli, M. Begel, C. Belanger-Champagne, L. Bellantoni, A. Bellavance, J.A. Benitez, S.B. Beri, G. Bernardi, R. Bernhard, I. Bertram, M. Besançon, R. Beuselinck, V.A. Bezzubov, P.C. Bhat, V. Bhatnagar, C. Biscarat, G. Blazey, F. Blekman, S. Blessing, D. Bloch, K. Bloom, A. Boehnlein, D. Boline, T.A. Bolton, E.E. Boos, G. Borissov, T. Bose, A. Brandt, R. Brock, G. Brooijmans, A. Bross, D. Brown, N.J. Buchanan, D. Buchholz, M. Buehler, V. Buescher, V. Bunichev, S. Burdin, S. Burke, T.H. Burnett, C.P. Buszello, J.M. Butler, P. Calfayan, S. Calvet, J. Cammin, W. Carvalho, B.C.K. Casey, H. Castilla-Valdez, S. Chakrabarti, D. Chakraborty, K. Chan, K.M. Chan, A. Chandra, F. Charles, E. Cheu, F. Chevallier, D.K. Cho, S. Choi, B. Choudhary, L. Christofek, T. Christoudias, S. Cihangir, D. Claes, J. Clutter, M. Cooke, W.E. Cooper, M. Corcoran, F. Couderc, M.-C. Cousinou, S. Crépé-Renaudin, D. Cutts, M. Ćwiok, H. da Motta, A. Das, G. Davies, K. De, S.J. de Jong, E. De La Cruz-Burelo, C. De Oliveira Martins, J.D. Degenhardt, F. Déliot, M. Demarteau, R. Demina, D. Denisov, S.P. Denisov, S. Desai, H.T. Diehl, M. Diesburg, A. Dominguez, H. Dong, L.V. Dudko, L. Duflot, S.R. Dugad, D. Duggan, A. Duperrin, J. Dyer, A. Dyshkant, M. Eads, D. Edmunds, J. Ellison, V.D. Elvira, Y. Enari, S. Eno, P. Ermolov, H. Evans, A. Evdokimov, V.N. Evdokimov, A.V. Ferapontov, T. Ferbel, F. Fiedler, F. Filthaut, W. Fisher, H.E. Fisk, M. Fortner, H. Fox, S. Fu, S. Fuess, T. Gadfort, C.F. Galea, E. Gallas, C. Garcia, A. Garcia-Bellido, V. Gavrilov, P. Gay, W. Geist, D. Gelé, C.E. Gerber, Y. Gershtein, D. Gillberg, G. Ginther, N. Gollub, B. Gómez, A. Goussiou, P.D. Grannis, H. Greenlee, Z.D. Greenwood, E.M. Gregores, G. Grenier, Ph. Gris, J.-F. Grivaz, A. Grohsjean, S. Grünendahl, M.W. Grünewald, F. Guo, J. Guo, G. Gutierrez, P. Gutierrez, A. Haas, N.J. Hadley, P. Haefner, S. Hagopian, J. Haley, I. Hall, R.E. Hall, L. Han, K. Harder, A. Harel, J.M. Hauptman, R. Hauser, J. Hays, T. Hebbeker, D. Hedin, J.G. Hegeman, A.P. Heinson, U. Heintz, C. Hensel, K. Herner, G. Hesketh, M.D. Hildreth, R. Hirosky, J.D. Hobbs, B. Hoeneisen, H. Hoeth, M. Hohlfeld, S.J. Hong, S. Hossain, P. Houben, Y. Hu, Z. Hubacek, V. Hynek, I. Iashvili, R. Illingworth, A.S. Ito, S. Jabeen, M. Jaffré, S. Jain, K. Jakobs, C. Jarvis, R. Jesik, K. Johns, C. Johnson, M. Johnson, A. Jonckheere, P. Jonsson, A. Juste, E. Kajfasz, J.M. Kalk, D. Karmanov, P.A. Kasper, I. Katsanos, D. Kau, V. Kaushik, R. Kehoe, S. Kermiche, N. Khalatyan, A. Khanov, A. Kharchilava, Y.M. Kharzheev, D. Khatidze, T.J. Kim, M.H. Kirby, M. Kirsch, B. Klima, J.M. Kohli, J.-P. Konrath, A.V. Kozelov, J. Kraus, D. Krop, T. Kuhl, A. Kumar, A. Kupco, T. Kurča, V.A. Kuzmin, J. Kvita, F. Lacroix, D. Lam, S. Lammers, G. Landsberg, P. Lebrun, W.M. Lee, A. Leflat, J. Lellouch, J. Leveque, J. Li, L. Li, Q.Z. Li, S.M. Lietti, J.G.R. Lima, D. Lincoln, J. Linnemann, V.V. Lipaev, R. Lipton, Y. Liu, Z. Liu, A. Lobodenko, M. Lokajicek, P. Love, H.J. Lubatti, R. Luna, A.L. Lyon, A.K.A. Maciel, D. Mackin, R.J. Madaras, P. Mättig, C. Magass, A. Magerkurth, P.K. Mal, H.B. Malbouisson, S. Malik, V.L. Malyshev, H.S. Mao, Y. Maravin, B. Martin, R. McCarthy, A. Melnitchouk, L. Mendoza, P.G. Mercadante, M. Merkin, K.W. Merritt, A. Meyer, J. Meyer, T. Millet, J. Mitrevski, R.K. Mommsen, N.K. Mondal, R.W. Moore, T. Moulik, G.S. Muanza, M. Mulhearn, O. Mundal, L. Mundim, E. Nagy, M. Naimuddin, M. Narain, N.A. Naumann, H.A. Neal, J.P. Negret, P. Neustroev, H. Nilsen, H. Nogima, S.F. Novaes, T. Nunnemann, V. O'Dell, D.C. O'Neil, G. Obrant, C. Ochando, D. Onoprienko, N. Oshima, N. Osman, J. Osta, R. Otec, G.J. Otero y Garzón, M. Owen, P. Padley, M. Pangilinan, N. Parashar, S.-J. Park, S.K. Park, J. Parsons, R. Partridge, N. Parua, A. Patwa, G. Pawloski, B. Penning, M. Perfilov, K. Peters, Y. Peters, P. Pétroff, M. Petteni, R. Piegaia, J. Piper, M.-A. Pleier, P.L.M. Podesta-Lerma, V.M. Podstavkov, Y. Pogorelov, M.-E. Pol, P. Polozov, B.G. Pope, A.V. Popov, C. Potter, W.L. Prado da Silva, H.B. Prosper, S. Protopopescu, J. Qian, A. Quadt, B. Quinn, A. Rakitine, M.S. Rangel, K. Ranjan, P.N. Ratoff, P. Renkel, S. Reucroft, P. Rich, J. Rieger, M. Rijssenbeek, I. Ripp-Baudot, F. Rizatdinova, S. Robinson, R.F. Rodrigues, M. Rominsky, C. Royon, P. Rubinov, R. Ruchti, G. Safronov, G. Sajot, A. Sánchez-Hernández, M.P. Sanders, B. Sanghi, A. Santoro, G. Savage, L. Sawyer, T. Scanlon, D. Schaile, R.D. Schamberger, Y. Scheglov, H. Schellman, T. Schliephake, C. Schwanenberger, A. Schwartzman, R. Schwienhorst, J. Sekaric, H. Severini, E. Shabalina, M. Shamim, V. Shary, A.A. Shchukin, R.K. Shivpuri, V. Siccardi, V. Simak, V. Sirotenko, P. Skubic, P. Slattery, D. Smirnov, G.R. Snow, J. Snow, S. Snyder, S. Söldner-Rembold, L. Sonnenschein, A. Sopczak, M. Sosebee, K. Soustruznik, B. Spurlock, J. Stark, J. Steele, V. Stolin, D.A. Stoyanova, J. Strandberg, S. Strandberg, M.A. Strang, E. Strauss, M. Strauss, R. Ströhmer, D. Strom, L. Stutte, S. Sumowidagdo, P. Svoisky, A. Sznajder, P. Tamburello, A. Tanasijczuk, W. Taylor, J. Temple, B. Tiller, F. Tissandier, M. Titov, V.V. Tokmenin, T. Toole, I. Torchiani, T. Trefzger, D. Tsybychev, B. Tuchming, C. Tully, P.M. Tuts, R. Unalan, L. Uvarov, S. Uvarov, S. Uzunyan, B. Vachon, P.J. van den Berg, R. Van Kooten, W.M. van Leeuwen, N. Varelas, E.W. Varnes, I.A. Vasilyev, M. Vaupel, P. Verdier, L.S. Vertogradov, M. Verzocchi, F. Villeneuve-Seguier, P. Vint, P. Vokac, E. Von Toerne, M. Voutilainen, R. Wagner, H.D. Wahl, L. Wang, M.H.L.S. Wang, J. Warchol, G. Watts, M. Wayne, G. Weber, M. Weber, L. Welty-Rieger, A. Wenger, N. Wermes, M. Wetstein, A. White, D. Wicke, G.W. Wilson, S.J. Wimpenny, M. Wobisch, D.R. Wood, T.R. Wyatt, Y. Xie, S. Yacoob, R. Yamada, M. Yan, T. Yasuda, Y.A. Yatsunenko, K. Yip, H.D. Yoo, S.W. Youn, J. Yu, C. Zeitnitz, T. Zhao, B. Zhou, J. Zhu, M. Zielinski, D. Zieminska, A. Zieminski, L. Zivkovic, V. Zutshi, and E.G. Zverev

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Top quark, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hadron, Topcolor, Tevatron, Technicolor, 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Invariant mass, 010306 general physics, Lepton, Boson
Abstract

We present a search for a narrow-width heavy resonance decaying into top quark pairs X->ttbar in ppbar collisions at sqrt{s}=1.96TeV using approximately 0.9fb^-1 of data collected with the D0 detector at the Fermilab Tevatron Collider. This analysis considers ttbar candidate events in the lepton plus jets channel with at least one identified b jet and uses the ttbar invariant mass distribution to search for evidence of resonant production. We find no evidence for a narrow resonance X decaying to ttbar. Therefore, we set upper limits on sigma*B(X->ttbar) for different hypothesized resonance masses using a Bayesian approach. For a Topcolor-assisted technicolor model, the existence of a leptophobic Z' boson with mass M_Z'

Published
2008

41. Measurement of the differential cross section for the production of an isolated photon with associated jet in pp¯ collisions at s=1.96 TeV

Author

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, T. Adams, E. Aguilo, S.H. Ahn, M. Ahsan, G.D. Alexeev, G. Alkhazov, A. Alton, G. Alverson, G.A. Alves, M. Anastasoaie, L.S. Ancu, T. Andeen, S. Anderson, B. Andrieu, M.S. Anzelc, M. Aoki, Y. Arnoud, M. Arov, M. Arthaud, A. Askew, B. Åsman, A.C.S. Assis Jesus, O. Atramentov, C. Avila, F. Badaud, A. Baden, L. Bagby, B. Baldin, D.V. Bandurin, P. Banerjee, S. Banerjee, E. Barberis, A.-F. Barfuss, P. Bargassa, P. Baringer, J. Barreto, J.F. Bartlett, U. Bassler, D. Bauer, S. Beale, A. Bean, M. Begalli, M. Begel, C. Belanger-Champagne, L. Bellantoni, A. Bellavance, J.A. Benitez, S.B. Beri, G. Bernardi, R. Bernhard, I. Bertram, M. Besançon, R. Beuselinck, V.A. Bezzubov, P.C. Bhat, V. Bhatnagar, C. Biscarat, G. Blazey, F. Blekman, S. Blessing, D. Bloch, K. Bloom, A. Boehnlein, D. Boline, T.A. Bolton, E.E. Boos, G. Borissov, T. Bose, A. Brandt, R. Brock, G. Brooijmans, A. Bross, D. Brown, N.J. Buchanan, D. Buchholz, M. Buehler, V. Buescher, V. Bunichev, S. Burdin, S. Burke, T.H. Burnett, C.P. Buszello, J.M. Butler, P. Calfayan, S. Calvet, J. Cammin, W. Carvalho, B.C.K. Casey, H. Castilla-Valdez, S. Chakrabarti, D. Chakraborty, K. Chan, K.M. Chan, A. Chandra, F. Charles, E. Cheu, F. Chevallier, D.K. Cho, S. Choi, B. Choudhary, L. Christofek, T. Christoudias, S. Cihangir, D. Claes, J. Clutter, M. Cooke, W.E. Cooper, M. Corcoran, F. Couderc, M.-C. Cousinou, S. Crépé-Renaudin, D. Cutts, M. Ćwiok, H. da Motta, A. Das, G. Davies, K. De, S.J. de Jong, E. De La Cruz-Burelo, C. De Oliveira Martins, J.D. Degenhardt, F. Déliot, M. Demarteau, R. Demina, D. Denisov, S.P. Denisov, S. Desai, H.T. Diehl, M. Diesburg, A. Dominguez, H. Dong, L.V. Dudko, L. Duflot, S.R. Dugad, D. Duggan, A. Duperrin, J. Dyer, A. Dyshkant, M. Eads, D. Edmunds, J. Ellison, V.D. Elvira, Y. Enari, S. Eno, P. Ermolov, H. Evans, A. Evdokimov, V.N. Evdokimov, A.V. Ferapontov, T. Ferbel, F. Fiedler, F. Filthaut, W. Fisher, H.E. Fisk, M. Fortner, H. Fox, S. Fu, S. Fuess, T. Gadfort, C.F. Galea, E. Gallas, C. Garcia, A. Garcia-Bellido, V. Gavrilov, P. Gay, W. Geist, D. Gelé, C.E. Gerber, Y. Gershtein, D. Gillberg, G. Ginther, N. Gollub, G.A. Golovanov, B. Gómez, A. Goussiou, P.D. Grannis, H. Greenlee, Z.D. Greenwood, E.M. Gregores, G. Grenier, Ph. Gris, J.-F. Grivaz, A. Grohsjean, S. Grünendahl, M.W. Grünewald, F. Guo, J. Guo, G. Gutierrez, P. Gutierrez, A. Haas, N.J. Hadley, P. Haefner, S. Hagopian, J. Haley, I. Hall, R.E. Hall, L. Han, K. Harder, A. Harel, J.M. Hauptman, R. Hauser, J. Hays, T. Hebbeker, D. Hedin, J.G. Hegeman, A.P. Heinson, U. Heintz, C. Hensel, K. Herner, G. Hesketh, M.D. Hildreth, R. Hirosky, J.D. Hobbs, B. Hoeneisen, H. Hoeth, M. Hohlfeld, S.J. Hong, S. Hossain, P. Houben, Y. Hu, Z. Hubacek, V. Hynek, I. Iashvili, R. Illingworth, A.S. Ito, S. Jabeen, M. Jaffré, S. Jain, K. Jakobs, C. Jarvis, R. Jesik, K. Johns, C. Johnson, M. Johnson, A. Jonckheere, P. Jonsson, A. Juste, E. Kajfasz, J.M. Kalk, D. Karmanov, P.A. Kasper, I. Katsanos, D. Kau, V. Kaushik, R. Kehoe, S. Kermiche, N. Khalatyan, A. Khanov, A. Kharchilava, Y.M. Kharzheev, D. Khatidze, T.J. Kim, M.H. Kirby, M. Kirsch, B. Klima, J.M. Kohli, J.-P. Konrath, D.E. Korablev, A.V. Kozelov, J. Kraus, D. Krop, T. Kuhl, A. Kumar, A. Kupco, T. Kurča, V.A. Kuzmin, J. Kvita, F. Lacroix, D. Lam, S. Lammers, G. Landsberg, P. Lebrun, W.M. Lee, A. Leflat, J. Lellouch, J. Leveque, J. Li, L. Li, Q.Z. Li, S.M. Lietti, J.G.R. Lima, D. Lincoln, J. Linnemann, V.V. Lipaev, R. Lipton, Y. Liu, Z. Liu, A. Lobodenko, M. Lokajicek, P. Love, H.J. Lubatti, R. Luna, A.L. Lyon, A.K.A. Maciel, D. Mackin, R.J. Madaras, P. Mättig, C. Magass, A. Magerkurth, P.K. Mal, H.B. Malbouisson, S. Malik, V.L. Malyshev, H.S. Mao, Y. Maravin, B. Martin, R. McCarthy, A. Melnitchouk, L. Mendoza, P.G. Mercadante, M. Merkin, K.W. Merritt, A. Meyer, J. Meyer, T. Millet, J. Mitrevski, R.K. Mommsen, N.K. Mondal, R.W. Moore, T. Moulik, G.S. Muanza, M. Mulhearn, O. Mundal, L. Mundim, E. Nagy, M. Naimuddin, M. Narain, N.A. Naumann, H.A. Neal, J.P. Negret, P. Neustroev, H. Nilsen, H. Nogima, S.F. Novaes, T. Nunnemann, V. O'Dell, D.C. O'Neil, G. Obrant, C. Ochando, D. Onoprienko, N. Oshima, N. Osman, J. Osta, R. Otec, G.J. Otero y Garzón, M. Owen, P. Padley, M. Pangilinan, N. Parashar, S.-J. Park, S.K. Park, J. Parsons, R. Partridge, N. Parua, A. Patwa, G. Pawloski, B. Penning, M. Perfilov, K. Peters, Y. Peters, P. Pétroff, M. Petteni, R. Piegaia, J. Piper, M.-A. Pleier, P.L.M. Podesta-Lerma, V.M. Podstavkov, Y. Pogorelov, M.-E. Pol, P. Polozov, B.G. Pope, A.V. Popov, C. Potter, W.L. Prado da Silva, H.B. Prosper, S. Protopopescu, J. Qian, A. Quadt, B. Quinn, A. Rakitine, M.S. Rangel, K. Ranjan, P.N. Ratoff, P. Renkel, S. Reucroft, P. Rich, J. Rieger, M. Rijssenbeek, I. Ripp-Baudot, F. Rizatdinova, S. Robinson, R.F. Rodrigues, M. Rominsky, C. Royon, P. Rubinov, R. Ruchti, G. Safronov, G. Sajot, A. Sánchez-Hernández, M.P. Sanders, B. Sanghi, A. Santoro, G. Savage, L. Sawyer, T. Scanlon, D. Schaile, R.D. Schamberger, Y. Scheglov, H. Schellman, T. Schliephake, C. Schwanenberger, A. Schwartzman, R. Schwienhorst, J. Sekaric, H. Severini, E. Shabalina, M. Shamim, V. Shary, A.A. Shchukin, R.K. Shivpuri, V. Siccardi, V. Simak, V. Sirotenko, N.B. Skachkov, P. Skubic, P. Slattery, D. Smirnov, G.R. Snow, J. Snow, S. Snyder, S. Söldner-Rembold, L. Sonnenschein, A. Sopczak, M. Sosebee, K. Soustruznik, B. Spurlock, J. Stark, J. Steele, V. Stolin, D.A. Stoyanova, J. Strandberg, S. Strandberg, M.A. Strang, E. Strauss, M. Strauss, R. Ströhmer, D. Strom, L. Stutte, S. Sumowidagdo, P. Svoisky, A. Sznajder, P. Tamburello, A. Tanasijczuk, W. Taylor, J. Temple, B. Tiller, F. Tissandier, M. Titov, V.V. Tokmenin, T. Toole, I. Torchiani, T. Trefzger, D. Tsybychev, B. Tuchming, C. Tully, P.M. Tuts, R. Unalan, L. Uvarov, S. Uvarov, S. Uzunyan, B. Vachon, P.J. van den Berg, R. Van Kooten, W.M. van Leeuwen, N. Varelas, E.W. Varnes, I.A. Vasilyev, M. Vaupel, P. Verdier, L.S. Vertogradov, M. Verzocchi, F. Villeneuve-Seguier, P. Vint, P. Vokac, E. Von Toerne, M. Voutilainen, R. Wagner, H.D. Wahl, L. Wang, M.H.L.S. Wang, J. Warchol, G. Watts, M. Wayne, G. Weber, M. Weber, L. Welty-Rieger, A. Wenger, N. Wermes, M. Wetstein, A. White, D. Wicke, G.W. Wilson, S.J. Wimpenny, M. Wobisch, D.R. Wood, T.R. Wyatt, Y. Xie, S. Yacoob, R. Yamada, M. Yan, T. Yasuda, Y.A. Yatsunenko, K. Yip, H.D. Yoo, S.W. Youn, J. Yu, C. Zeitnitz, T. Zhao, B. Zhou, J. Zhu, M. Zielinski, D. Zieminska, A. Zieminski, L. Zivkovic, V. Zutshi, and E.G. Zverev

Subjects
Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Jet (fluid), Particle physics, Photon, 010308 nuclear & particles physics, Tevatron, Parton, 7. Clean energy, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, High Energy Physics::Experiment, Rapidity, Fermilab, 010306 general physics, Collider
Abstract

The process ppbar -> photon + jet + X is studied using 1.0 fb^-1 of data collected by the D0 detector at the Fermilab Tevatron ppbar collider at a center-of-mass energy sqrt(s)=1.96 TeV. Photons are reconstructed in the central rapidity region |y_gamma

Published
2008

42. Measurement of the ratio of the pp¯→W+c-jet cross section to the inclusive pp¯→W+jets cross section

Author

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, T. Adams, E. Aguilo, S.H. Ahn, M. Ahsan, G.D. Alexeev, G. Alkhazov, A. Alton, G. Alverson, G.A. Alves, M. Anastasoaie, L.S. Ancu, T. Andeen, S. Anderson, B. Andrieu, M.S. Anzelc, M. Aoki, Y. Arnoud, M. Arov, M. Arthaud, A. Askew, B. Åsman, A.C.S. Assis Jesus, O. Atramentov, C. Avila, C. Ay, F. Badaud, A. Baden, L. Bagby, B. Baldin, D.V. Bandurin, P. Banerjee, S. Banerjee, E. Barberis, A.-F. Barfuss, P. Bargassa, P. Baringer, J. Barreto, J.F. Bartlett, U. Bassler, D. Bauer, S. Beale, A. Bean, M. Begalli, M. Begel, C. Belanger-Champagne, L. Bellantoni, A. Bellavance, J.A. Benitez, S.B. Beri, G. Bernardi, R. Bernhard, I. Bertram, M. Besançon, R. Beuselinck, V.A. Bezzubov, P.C. Bhat, V. Bhatnagar, C. Biscarat, G. Blazey, F. Blekman, S. Blessing, D. Bloch, K. Bloom, A. Boehnlein, D. Boline, T.A. Bolton, G. Borissov, T. Bose, A. Brandt, R. Brock, G. Brooijmans, A. Bross, D. Brown, N.J. Buchanan, D. Buchholz, M. Buehler, V. Buescher, V. Bunichev, S. Burdin, S. Burke, T.H. Burnett, C.P. Buszello, J.M. Butler, P. Calfayan, S. Calvet, J. Cammin, W. Carvalho, B.C.K. Casey, H. Castilla-Valdez, S. Chakrabarti, D. Chakraborty, K. Chan, K.M. Chan, A. Chandra, F. Charles, E. Cheu, F. Chevallier, D.K. Cho, S. Choi, B. Choudhary, L. Christofek, T. Christoudias, S. Cihangir, D. Claes, Y. Coadou, M. Cooke, W.E. Cooper, M. Corcoran, F. Couderc, M.-C. Cousinou, S. Crépé-Renaudin, D. Cutts, M. Ćwiok, H. da Motta, A. Das, G. Davies, K. De, S.J. de Jong, E. De La Cruz-Burelo, C. De Oliveira Martins, J.D. Degenhardt, F. Déliot, M. Demarteau, R. Demina, D. Denisov, S.P. Denisov, S. Desai, H.T. Diehl, M. Diesburg, A. Dominguez, H. Dong, L.V. Dudko, L. Duflot, S.R. Dugad, D. Duggan, A. Duperrin, J. Dyer, A. Dyshkant, M. Eads, D. Edmunds, J. Ellison, V.D. Elvira, Y. Enari, S. Eno, P. Ermolov, H. Evans, A. Evdokimov, V.N. Evdokimov, A.V. Ferapontov, T. Ferbel, F. Fiedler, F. Filthaut, W. Fisher, H.E. Fisk, M. Fortner, H. Fox, S. Fu, S. Fuess, T. Gadfort, C.F. Galea, E. Gallas, C. Garcia, A. Garcia-Bellido, V. Gavrilov, P. Gay, W. Geist, D. Gelé, C.E. Gerber, Y. Gershtein, D. Gillberg, G. Ginther, N. Gollub, B. Gómez, A. Goussiou, P.D. Grannis, H. Greenlee, Z.D. Greenwood, E.M. Gregores, G. Grenier, Ph. Gris, J.-F. Grivaz, A. Grohsjean, S. Grünendahl, M.W. Grünewald, F. Guo, J. Guo, G. Gutierrez, P. Gutierrez, A. Haas, N.J. Hadley, P. Haefner, S. Hagopian, J. Haley, I. Hall, R.E. Hall, L. Han, K. Harder, A. Harel, R. Harrington, J.M. Hauptman, R. Hauser, J. Hays, T. Hebbeker, D. Hedin, J.G. Hegeman, J.M. Heinmiller, A.P. Heinson, U. Heintz, C. Hensel, K. Herner, G. Hesketh, M.D. Hildreth, R. Hirosky, J.D. Hobbs, B. Hoeneisen, H. Hoeth, M. Hohlfeld, S.J. Hong, S. Hossain, P. Houben, Y. Hu, Z. Hubacek, V. Hynek, I. Iashvili, R. Illingworth, A.S. Ito, S. Jabeen, M. Jaffré, S. Jain, K. Jakobs, C. Jarvis, R. Jesik, K. Johns, C. Johnson, M. Johnson, A. Jonckheere, P. Jonsson, A. Juste, E. Kajfasz, A.M. Kalinin, J.M. Kalk, S. Kappler, D. Karmanov, P.A. Kasper, I. Katsanos, D. Kau, V. Kaushik, R. Kehoe, S. Kermiche, N. Khalatyan, A. Khanov, A. Kharchilava, Y.M. Kharzheev, D. Khatidze, T.J. Kim, M.H. Kirby, M. Kirsch, B. Klima, J.M. Kohli, J.-P. Konrath, V.M. Korablev, A.V. Kozelov, J. Kraus, D. Krop, T. Kuhl, A. Kumar, A. Kupco, T. Kurča, J. Kvita, F. Lacroix, D. Lam, S. Lammers, G. Landsberg, P. Lebrun, W.M. Lee, A. Leflat, J. Lellouch, J. Leveque, J. Li, L. Li, Q.Z. Li, S.M. Lietti, J.G.R. Lima, D. Lincoln, J. Linnemann, V.V. Lipaev, R. Lipton, Y. Liu, Z. Liu, A. Lobodenko, M. Lokajicek, P. Love, H.J. Lubatti, R. Luna, A.L. Lyon, A.K.A. Maciel, D. Mackin, R.J. Madaras, P. Mättig, C. Magass, A. Magerkurth, P.K. Mal, H.B. Malbouisson, S. Malik, V.L. Malyshev, H.S. Mao, Y. Maravin, B. Martin, R. McCarthy, A. Melnitchouk, L. Mendoza, P.G. Mercadante, M. Merkin, K.W. Merritt, A. Meyer, J. Meyer, T. Millet, J. Mitrevski, J. Molina, R.K. Mommsen, N.K. Mondal, R.W. Moore, T. Moulik, G.S. Muanza, M. Mulders, M. Mulhearn, O. Mundal, L. Mundim, E. Nagy, M. Naimuddin, M. Narain, N.A. Naumann, H.A. Neal, J.P. Negret, P. Neustroev, H. Nilsen, H. Nogima, S.F. Novaes, T. Nunnemann, V. O'Dell, D.C. O'Neil, G. Obrant, C. Ochando, D. Onoprienko, N. Oshima, N. Osman, J. Osta, R. Otec, G.J. Otero y Garzón, M. Owen, P. Padley, M. Pangilinan, N. Parashar, S.-J. Park, S.K. Park, J. Parsons, R. Partridge, N. Parua, A. Patwa, G. Pawloski, B. Penning, M. Perfilov, K. Peters, Y. Peters, P. Pétroff, M. Petteni, R. Piegaia, J. Piper, M.-A. Pleier, P.L.M. Podesta-Lerma, V.M. Podstavkov, Y. Pogorelov, M.-E. Pol, P. Polozov, B.G. Pope, A.V. Popov, C. Potter, W.L. Prado da Silva, H.B. Prosper, S. Protopopescu, J. Qian, A. Quadt, B. Quinn, A. Rakitine, M.S. Rangel, K. Ranjan, P.N. Ratoff, P. Renkel, S. Reucroft, P. Rich, J. Rieger, M. Rijssenbeek, I. Ripp-Baudot, F. Rizatdinova, S. Robinson, R.F. Rodrigues, M. Rominsky, C. Royon, P. Rubinov, R. Ruchti, G. Safronov, G. Sajot, A. Sánchez-Hernández, M.P. Sanders, A. Santoro, G. Savage, L. Sawyer, T. Scanlon, D. Schaile, R.D. Schamberger, Y. Scheglov, H. Schellman, T. Schliephake, C. Schwanenberger, A. Schwartzman, R. Schwienhorst, J. Sekaric, H. Severini, E. Shabalina, M. Shamim, V. Shary, A.A. Shchukin, R.K. Shivpuri, V. Siccardi, V. Simak, V. Sirotenko, P. Skubic, P. Slattery, D. Smirnov, G.R. Snow, J. Snow, S. Snyder, S. Söldner-Rembold, L. Sonnenschein, A. Sopczak, M. Sosebee, K. Soustruznik, B. Spurlock, J. Stark, J. Steele, V. Stolin, D.A. Stoyanova, J. Strandberg, S. Strandberg, M.A. Strang, E. Strauss, M. Strauss, R. Ströhmer, D. Strom, L. Stutte, S. Sumowidagdo, P. Svoisky, A. Sznajder, P. Tamburello, A. Tanasijczuk, W. Taylor, J. Temple, B. Tiller, F. Tissandier, M. Titov, V.V. Tokmenin, T. Toole, I. Torchiani, T. Trefzger, D. Tsybychev, B. Tuchming, C. Tully, P.M. Tuts, R. Unalan, L. Uvarov, S. Uvarov, S. Uzunyan, B. Vachon, P.J. van den Berg, R. Van Kooten, W.M. van Leeuwen, N. Varelas, E.W. Varnes, I.A. Vasilyev, M. Vaupel, P. Verdier, L.S. Vertogradov, M. Verzocchi, F. Villeneuve-Seguier, P. Vint, P. Vokac, E. Von Toerne, M. Voutilainen, R. Wagner, H.D. Wahl, L. Wang, M.H.L.S. Wang, J. Warchol, G. Watts, M. Wayne, G. Weber, M. Weber, L. Welty-Rieger, A. Wenger, N. Wermes, M. Wetstein, A. White, D. Wicke, G.W. Wilson, S.J. Wimpenny, M. Wobisch, D.R. Wood, T.R. Wyatt, Y. Xie, S. Yacoob, R. Yamada, M. Yan, T. Yasuda, Y.A. Yatsunenko, K. Yip, H.D. Yoo, S.W. Youn, J. Yu, A. Zatserklyaniy, C. Zeitnitz, T. Zhao, B. Zhou, J. Zhu, M. Zielinski, D. Zieminska, A. Zieminski, L. Zivkovic, V. Zutshi, and E.G. Zverev

Subjects
Physics, Nuclear and High Energy Physics, Jet (fluid), Particle physics, Muon, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Tevatron, Charge (physics), 01 natural sciences, 7. Clean energy, law.invention, Nuclear physics, law, Pseudorapidity, 0103 physical sciences, High Energy Physics::Experiment, Fermilab, Nuclear Experiment, 010306 general physics, Collider, Lepton
Abstract

We present a measurement of the fraction of inclusive W +jets events produced with net charm quantum number 11, denoted W + c-jet, in p collisions at root s = 1.96 TeV using approximately 1 fb(-1) of data collected by the DO detector at the Fermilab Tevatron Collider. We identify the W +jets events via the leptonic W boson decays. Candidate W + c-jet events are selected by requiring a jet containing a muon in association with a reconstructed W boson and exploiting the charge correlation between this muon and W boson decay lepton to perform a nearly model-independent background subtraction. We measure the fraction of W + c-jet events in the inclusive W +jets sample for jet PT > 20 GeV and pseudorapidity |eta| < 2.5 to be 0.074 +/- 0.019(stat.) +/-(0.012)(0.014) (syst.), in agreement with theoretical predictions. The probability that background fluctuations could produce the observed fraction of W + c-jet events is estimated to be 2.5 x 10(-4), which corresponds to a 3.5 sigma statistical significance.

Published
2008

43. A combined search for the standard model Higgs boson at s=1.96 TeV

Author

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, T. Adams, E. Aguilo, S.H. Ahn, M. Ahsan, G.D. Alexeev, G. Alkhazov, A. Alton, G. Alverson, G.A. Alves, M. Anastasoaie, L.S. Ancu, T. Andeen, S. Anderson, B. Andrieu, M.S. Anzelc, Y. Arnoud, M. Arov, M. Arthaud, A. Askew, B. Åsman, A.C.S. Assis Jesus, O. Atramentov, C. Autermann, C. Avila, C. Ay, F. Badaud, A. Baden, L. Bagby, B. Baldin, S. Banerjee, P. Banerjee, E. Barberis, A.-F. Barfuss, P. Bargassa, P. Baringer, J. Barreto, J.F. Bartlett, U. Bassler, D. Bauer, S. Beale, A. Bean, M. Begalli, M. Begel, C. Belanger-Champagne, L. Bellantoni, A. Bellavance, J.A. Benitez, S.B. Beri, G. Bernardi, R. Bernhard, I. Bertram, M. Besançon, R. Beuselinck, V.A. Bezzubov, P.C. Bhat, V. Bhatnagar, C. Biscarat, G. Blazey, F. Blekman, S. Blessing, D. Bloch, K. Bloom, A. Boehnlein, D. Boline, T.A. Bolton, G. Borissov, T. Bose, A. Brandt, R. Brock, G. Brooijmans, A. Bross, D. Brown, N.J. Buchanan, D. Buchholz, M. Buehler, V. Buescher, V. Bunichev, S. Burdin, S. Burke, T.H. Burnett, C.P. Buszello, J.M. Butler, P. Calfayan, S. Calvet, J. Cammin, W. Carvalho, B.C.K. Casey, N.M. Cason, H. Castilla-Valdez, S. Chakrabarti, D. Chakraborty, K.M. Chan, K. Chan, A. Chandra, F. Charles, E. Cheu, F. Chevallier, D.K. Cho, S. Choi, B. Choudhary, L. Christofek, T. Christoudias, S. Cihangir, D. Claes, Y. Coadou, M. Cooke, W.E. Cooper, M. Corcoran, F. Couderc, M.-C. Cousinou, S. Crépé-Renaudin, D. Cutts, M. Ćwiok, H. da Motta, A. Das, G. Davies, K. De, S.J. de Jong, E. De La Cruz-Burelo, C. De Oliveira Martins, J.D. Degenhardt, F. Déliot, M. Demarteau, R. Demina, D. Denisov, S.P. Denisov, S. Desai, H.T. Diehl, M. Diesburg, A. Dominguez, H. Dong, L.V. Dudko, L. Duflot, S.R. Dugad, D. Duggan, A. Duperrin, J. Dyer, A. Dyshkant, M. Eads, D. Edmunds, J. Ellison, J. Elmsheuser, V.D. Elvira, Y. Enari, S. Eno, P. Ermolov, H. Evans, A. Evdokimov, V.N. Evdokimov, A.V. Ferapontov, T. Ferbel, F. Fiedler, F. Filthaut, W. Fisher, H.E. Fisk, M. Ford, M. Fortner, H. Fox, S. Fu, S. Fuess, T. Gadfort, C.F. Galea, E. Gallas, E. Galyaev, C. Garcia, A. Garcia-Bellido, V. Gavrilov, P. Gay, W. Geist, D. Gelé, C.E. Gerber, Y. Gershtein, D. Gillberg, G. Ginther, N. Gollub, B. Gómez, A. Goussiou, P.D. Grannis, H. Greenlee, Z.D. Greenwood, E.M. Gregores, G. Grenier, Ph. Gris, J.-F. Grivaz, A. Grohsjean, S. Grünendahl, M.W. Grünewald, J. Guo, F. Guo, P. Gutierrez, G. Gutierrez, A. Haas, N.J. Hadley, P. Haefner, S. Hagopian, J. Haley, I. Hall, R.E. Hall, L. Han, K. Hanagaki, P. Hansson, K. Harder, A. Harel, R. Harrington, J.M. Hauptman, R. Hauser, J. Hays, T. Hebbeker, D. Hedin, J.G. Hegeman, J.M. Heinmiller, A.P. Heinson, U. Heintz, C. Hensel, K. Herner, G. Hesketh, M.D. Hildreth, R. Hirosky, J.D. Hobbs, B. Hoeneisen, H. Hoeth, M. Hohlfeld, S.J. Hong, S. Hossain, P. Houben, Y. Hu, Z. Hubacek, V. Hynek, I. Iashvili, R. Illingworth, A.S. Ito, S. Jabeen, M. Jaffré, S. Jain, K. Jakobs, C. Jarvis, R. Jesik, K. Johns, C. Johnson, M. Johnson, A. Jonckheere, P. Jonsson, A. Juste, D. Käfer, E. Kajfasz, A.M. Kalinin, J.R. Kalk, J.M. Kalk, S. Kappler, D. Karmanov, P. Kasper, I. Katsanos, D. Kau, R. Kaur, V. Kaushik, R. Kehoe, S. Kermiche, N. Khalatyan, A. Khanov, A. Kharchilava, Y.M. Kharzheev, D. Khatidze, H. Kim, T.J. Kim, M.H. Kirby, M. Kirsch, B. Klima, J.M. Kohli, J.-P. Konrath, M. Kopal, V.M. Korablev, A.V. Kozelov, D. Krop, T. Kuhl, A. Kumar, S. Kunori, A. Kupco, T. Kurča, J. Kvita, F. Lacroix, D. Lam, S. Lammers, G. Landsberg, P. Lebrun, W.M. Lee, A. Leflat, F. Lehner, J. Lellouch, J. Leveque, P. Lewis, J. Li, Q.Z. Li, L. Li, S.M. Lietti, J.G.R. Lima, D. Lincoln, J. Linnemann, V.V. Lipaev, R. Lipton, Y. Liu, Z. Liu, L. Lobo, A. Lobodenko, M. Lokajicek, P. Love, H.J. Lubatti, A.L. Lyon, A.K.A. Maciel, D. Mackin, R.J. Madaras, P. Mättig, C. Magass, A. Magerkurth, P.K. Mal, H.B. Malbouisson, S. Malik, V.L. Malyshev, H.S. Mao, Y. Maravin, B. Martin, R. McCarthy, A. Melnitchouk, A. Mendes, L. Mendoza, P.G. Mercadante, M. Merkin, K.W. Merritt, J. Meyer, A. Meyer, T. Millet, J. Mitrevski, J. Molina, R.K. Mommsen, N.K. Mondal, R.W. Moore, T. Moulik, G.S. Muanza, M. Mulders, M. Mulhearn, O. Mundal, L. Mundim, E. Nagy, M. Naimuddin, M. Narain, N.A. Naumann, H.A. Neal, J.P. Negret, P. Neustroev, H. Nilsen, H. Nogima, A. Nomerotski, S.F. Novaes, T. Nunnemann, V. O'Dell, D.C. O'Neil, G. Obrant, C. Ochando, D. Onoprienko, N. Oshima, J. Osta, R. Otec, G.J. Otero y Garzón, M. Owen, P. Padley, M. Pangilinan, N. Parashar, S.-J. Park, S.K. Park, J. Parsons, R. Partridge, N. Parua, A. Patwa, G. Pawloski, B. Penning, M. Perfilov, K. Peters, Y. Peters, P. Pétroff, M. Petteni, R. Piegaia, J. Piper, M.-A. Pleier, P.L.M. Podesta-Lerma, V.M. Podstavkov, Y. Pogorelov, M.-E. Pol, P. Polozov, B.G. Pope, A.V. Popov, C. Potter, W.L. Prado da Silva, H.B. Prosper, S. Protopopescu, J. Qian, A. Quadt, B. Quinn, A. Rakitine, M.S. Rangel, K. Ranjan, P.N. Ratoff, P. Renkel, S. Reucroft, P. Rich, M. Rijssenbeek, I. Ripp-Baudot, F. Rizatdinova, S. Robinson, R.F. Rodrigues, M. Rominsky, C. Royon, P. Rubinov, R. Ruchti, G. Safronov, G. Sajot, A. Sánchez-Hernández, M.P. Sanders, A. Santoro, G. Savage, L. Sawyer, T. Scanlon, D. Schaile, R.D. Schamberger, Y. Scheglov, H. Schellman, P. Schieferdecker, T. Schliephake, C. Schwanenberger, A. Schwartzman, R. Schwienhorst, J. Sekaric, H. Severini, E. Shabalina, M. Shamim, V. Shary, A.A. Shchukin, R.K. Shivpuri, V. Siccardi, V. Simak, V. Sirotenko, P. Skubic, P. Slattery, D. Smirnov, J. Snow, G.R. Snow, S. Snyder, S. Söldner-Rembold, L. Sonnenschein, A. Sopczak, M. Sosebee, K. Soustruznik, M. Souza, B. Spurlock, J. Stark, J. Steele, V. Stolin, D.A. Stoyanova, J. Strandberg, S. Strandberg, M.A. Strang, M. Strauss, E. Strauss, R. Ströhmer, D. Strom, L. Stutte, S. Sumowidagdo, P. Svoisky, A. Sznajder, M. Talby, P. Tamburello, A. Tanasijczuk, W. Taylor, J. Temple, B. Tiller, F. Tissandier, M. Titov, V.V. Tokmenin, T. Toole, I. Torchiani, T. Trefzger, D. Tsybychev, B. Tuchming, C. Tully, P.M. Tuts, R. Unalan, S. Uvarov, L. Uvarov, S. Uzunyan, B. Vachon, P.J. van den Berg, R. Van Kooten, W.M. van Leeuwen, N. Varelas, E.W. Varnes, I.A. Vasilyev, M. Vaupel, P. Verdier, L.S. Vertogradov, M. Verzocchi, F. Villeneuve-Seguier, P. Vint, P. Vokac, E. Von Toerne, M. Voutilainen, R. Wagner, H.D. Wahl, L. Wang, M.H.L.S. Wang, J. Warchol, G. Watts, M. Wayne, M. Weber, G. Weber, A. Wenger, N. Wermes, M. Wetstein, A. White, D. Wicke, G.W. Wilson, S.J. Wimpenny, M. Wobisch, D.R. Wood, T.R. Wyatt, Y. Xie, S. Yacoob, R. Yamada, M. Yan, T. Yasuda, Y.A. Yatsunenko, K. Yip, H.D. Yoo, S.W. Youn, J. Yu, A. Zatserklyaniy, C. Zeitnitz, T. Zhao, B. Zhou, J. Zhu, M. Zielinski, D. Zieminska, A. Zieminski, L. Zivkovic, V. Zutshi, and E.G. Zverev

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, State (functional analysis), 7. Clean energy, 01 natural sciences, Standard Model, Nuclear physics, Direct production, 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, Center of mass, Neutrino, 010306 general physics, Lepton
Abstract

We present new results of the search for WH→ℓνbb¯ production in pp¯ collisions at a center-of-mass energy of s=1.96 TeV, based on a dataset with integrated luminosity of 0.44 fb−1. We combine these new results with previously published searches by the D0 collaboration, for WH and ZH production analyzed in the E̸Tbb¯ final state, for ZH (→ℓ+ℓ−bb¯) production, for WH (→WWW) production, and for H (→WW) direct production. No signal-like excess is observed either in the WH analysis or in the combination of all D0 Higgs boson analyses. We set 95% C.L. (expected) upper limits on σ(pp¯→WH)×B(H→bb¯) ranging from 1.6 (2.2) pb to 1.9 (3.3) pb for Higgs boson masses between 105 and 145 GeV, to be compared to the theoretical prediction of 0.13 pb for a Standard Model (SM) Higgs boson with mass mH=115 GeV. After combination with the other D0 Higgs boson searches, we obtain for mH=115 GeV an observed (expected) limit 8.5 (12.1) times higher than the SM predicted Higgs boson production cross section. For mH=160 GeV, the corresponding observed (expected) ratio is 10.2 (9.0).

Published
2008

44. Search for squarks and gluinos in events with jets and missing transverse energy using 2.1 fb−1 of pp¯ collision data at s=1.96 TeV

Author

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, T. Adams, E. Aguilo, S.H. Ahn, M. Ahsan, G.D. Alexeev, G. Alkhazov, A. Alton, G. Alverson, G.A. Alves, M. Anastasoaie, L.S. Ancu, T. Andeen, S. Anderson, B. Andrieu, M.S. Anzelc, Y. Arnoud, M. Arov, M. Arthaud, A. Askew, B. Åsman, A.C.S. Assis Jesus, O. Atramentov, C. Autermann, C. Avila, C. Ay, F. Badaud, A. Baden, L. Bagby, B. Baldin, D.V. Bandurin, S. Banerjee, P. Banerjee, E. Barberis, A.-F. Barfuss, P. Bargassa, P. Baringer, J. Barreto, J.F. Bartlett, U. Bassler, D. Bauer, S. Beale, A. Bean, M. Begalli, M. Begel, C. Belanger-Champagne, L. Bellantoni, A. Bellavance, J.A. Benitez, S.B. Beri, G. Bernardi, R. Bernhard, I. Bertram, M. Besançon, R. Beuselinck, V.A. Bezzubov, P.C. Bhat, V. Bhatnagar, C. Biscarat, G. Blazey, F. Blekman, S. Blessing, D. Bloch, K. Bloom, A. Boehnlein, D. Boline, T.A. Bolton, G. Borissov, T. Bose, A. Brandt, R. Brock, G. Brooijmans, A. Bross, D. Brown, N.J. Buchanan, D. Buchholz, M. Buehler, V. Buescher, V. Bunichev, S. Burdin, S. Burke, T.H. Burnett, C.P. Buszello, J.M. Butler, P. Calfayan, S. Calvet, J. Cammin, W. Carvalho, B.C.K. Casey, N.M. Cason, H. Castilla-Valdez, S. Chakrabarti, D. Chakraborty, K.M. Chan, K. Chan, A. Chandra, F. Charles, E. Cheu, F. Chevallier, D.K. Cho, S. Choi, B. Choudhary, L. Christofek, T. Christoudias, S. Cihangir, D. Claes, Y. Coadou, M. Cooke, W.E. Cooper, M. Corcoran, F. Couderc, M.-C. Cousinou, S. Crépé-Renaudin, D. Cutts, M. Ćwiok, H. da Motta, A. Das, G. Davies, K. De, S.J. de Jong, E. De La Cruz-Burelo, C. De Oliveira Martins, J.D. Degenhardt, F. Déliot, M. Demarteau, R. Demina, D. Denisov, S.P. Denisov, S. Desai, H.T. Diehl, M. Diesburg, A. Dominguez, H. Dong, L.V. Dudko, L. Duflot, S.R. Dugad, D. Duggan, A. Duperrin, J. Dyer, A. Dyshkant, M. Eads, D. Edmunds, J. Ellison, V.D. Elvira, Y. Enari, S. Eno, P. Ermolov, H. Evans, A. Evdokimov, V.N. Evdokimov, A.V. Ferapontov, T. Ferbel, F. Fiedler, F. Filthaut, W. Fisher, H.E. Fisk, M. Ford, M. Fortner, H. Fox, S. Fu, S. Fuess, T. Gadfort, C.F. Galea, E. Gallas, E. Galyaev, C. Garcia, A. Garcia-Bellido, V. Gavrilov, P. Gay, W. Geist, D. Gelé, C.E. Gerber, Y. Gershtein, D. Gillberg, G. Ginther, N. Gollub, B. Gómez, A. Goussiou, P.D. Grannis, H. Greenlee, Z.D. Greenwood, E.M. Gregores, G. Grenier, Ph. Gris, J.-F. Grivaz, A. Grohsjean, S. Grünendahl, M.W. Grünewald, J. Guo, F. Guo, P. Gutierrez, G. Gutierrez, A. Haas, N.J. Hadley, P. Haefner, S. Hagopian, J. Haley, I. Hall, R.E. Hall, L. Han, P. Hansson, K. Harder, A. Harel, R. Harrington, J.M. Hauptman, R. Hauser, J. Hays, T. Hebbeker, D. Hedin, J.G. Hegeman, J.M. Heinmiller, A.P. Heinson, U. Heintz, C. Hensel, K. Herner, G. Hesketh, M.D. Hildreth, R. Hirosky, J.D. Hobbs, B. Hoeneisen, H. Hoeth, M. Hohlfeld, S.J. Hong, S. Hossain, P. Houben, Y. Hu, Z. Hubacek, V. Hynek, I. Iashvili, R. Illingworth, A.S. Ito, S. Jabeen, M. Jaffré, S. Jain, K. Jakobs, C. Jarvis, R. Jesik, K. Johns, C. Johnson, M. Johnson, A. Jonckheere, P. Jonsson, A. Juste, E. Kajfasz, A.M. Kalinin, J.R. Kalk, J.M. Kalk, S. Kappler, D. Karmanov, P.A. Kasper, I. Katsanos, D. Kau, R. Kaur, V. Kaushik, R. Kehoe, S. Kermiche, N. Khalatyan, A. Khanov, A. Kharchilava, Y.M. Kharzheev, D. Khatidze, T.J. Kim, M.H. Kirby, M. Kirsch, B. Klima, J.M. Kohli, J.-P. Konrath, V.M. Korablev, A.V. Kozelov, D. Krop, T. Kuhl, A. Kumar, S. Kunori, A. Kupco, T. Kurča, J. Kvita, F. Lacroix, D. Lam, S. Lammers, G. Landsberg, P. Lebrun, W.M. Lee, A. Leflat, F. Lehner, J. Lellouch, J. Leveque, J. Li, Q.Z. Li, L. Li, S.M. Lietti, J.G.R. Lima, D. Lincoln, J. Linnemann, V.V. Lipaev, R. Lipton, Y. Liu, Z. Liu, A. Lobodenko, M. Lokajicek, P. Love, H.J. Lubatti, R. Luna, A.L. Lyon, A.K.A. Maciel, D. Mackin, R.J. Madaras, P. Mättig, C. Magass, A. Magerkurth, P.K. Mal, H.B. Malbouisson, S. Malik, V.L. Malyshev, H.S. Mao, Y. Maravin, B. Martin, R. McCarthy, A. Melnitchouk, L. Mendoza, P.G. Mercadante, M. Merkin, K.W. Merritt, J. Meyer, A. Meyer, T. Millet, J. Mitrevski, J. Molina, R.K. Mommsen, N.K. Mondal, R.W. Moore, T. Moulik, G.S. Muanza, M. Mulders, M. Mulhearn, O. Mundal, L. Mundim, E. Nagy, M. Naimuddin, M. Narain, N.A. Naumann, H.A. Neal, J.P. Negret, P. Neustroev, H. Nilsen, H. Nogima, S.F. Novaes, T. Nunnemann, V. O'Dell, D.C. O'Neil, G. Obrant, C. Ochando, D. Onoprienko, N. Oshima, J. Osta, R. Otec, G.J. Otero y Garzón, M. Owen, P. Padley, M. Pangilinan, N. Parashar, S.-J. Park, S.K. Park, J. Parsons, R. Partridge, N. Parua, A. Patwa, G. Pawloski, B. Penning, M. Perfilov, K. Peters, Y. Peters, P. Pétroff, M. Petteni, R. Piegaia, J. Piper, M.-A. Pleier, P.L.M. Podesta-Lerma, V.M. Podstavkov, Y. Pogorelov, M.-E. Pol, P. Polozov, B.G. Pope, A.V. Popov, C. Potter, W.L. Prado da Silva, H.B. Prosper, S. Protopopescu, J. Qian, A. Quadt, B. Quinn, A. Rakitine, M.S. Rangel, K. Ranjan, P.N. Ratoff, P. Renkel, S. Reucroft, P. Rich, J. Rieger, M. Rijssenbeek, I. Ripp-Baudot, F. Rizatdinova, S. Robinson, R.F. Rodrigues, M. Rominsky, C. Royon, P. Rubinov, R. Ruchti, G. Safronov, G. Sajot, A. Sánchez-Hernández, M.P. Sanders, A. Santoro, G. Savage, L. Sawyer, T. Scanlon, D. Schaile, R.D. Schamberger, Y. Scheglov, H. Schellman, T. Schliephake, C. Schwanenberger, A. Schwartzman, R. Schwienhorst, J. Sekaric, H. Severini, E. Shabalina, M. Shamim, V. Shary, A.A. Shchukin, R.K. Shivpuri, V. Siccardi, V. Simak, V. Sirotenko, P. Skubic, P. Slattery, D. Smirnov, J. Snow, G.R. Snow, S. Snyder, S. Söldner-Rembold, L. Sonnenschein, A. Sopczak, M. Sosebee, K. Soustruznik, B. Spurlock, J. Stark, J. Steele, V. Stolin, D.A. Stoyanova, J. Strandberg, S. Strandberg, M.A. Strang, M. Strauss, E. Strauss, R. Ströhmer, D. Strom, L. Stutte, S. Sumowidagdo, P. Svoisky, A. Sznajder, M. Talby, P. Tamburello, A. Tanasijczuk, W. Taylor, J. Temple, B. Tiller, F. Tissandier, M. Titov, V.V. Tokmenin, T. Toole, I. Torchiani, T. Trefzger, D. Tsybychev, B. Tuchming, C. Tully, P.M. Tuts, R. Unalan, S. Uvarov, L. Uvarov, S. Uzunyan, B. Vachon, P.J. van den Berg, R. Van Kooten, W.M. van Leeuwen, N. Varelas, E.W. Varnes, I.A. Vasilyev, M. Vaupel, P. Verdier, L.S. Vertogradov, M. Verzocchi, F. Villeneuve-Seguier, P. Vint, P. Vokac, E. Von Toerne, M. Voutilainen, R. Wagner, H.D. Wahl, L. Wang, M.H.L.S. Wang, J. Warchol, G. Watts, M. Wayne, M. Weber, G. Weber, L. Welty-Rieger, A. Wenger, N. Wermes, M. Wetstein, A. White, D. Wicke, G.W. Wilson, S.J. Wimpenny, M. Wobisch, D.R. Wood, T.R. Wyatt, Y. Xie, S. Yacoob, R. Yamada, M. Yan, T. Yasuda, Y.A. Yatsunenko, K. Yip, H.D. Yoo, S.W. Youn, J. Yu, A. Zatserklyaniy, C. Zeitnitz, T. Zhao, B. Zhou, J. Zhu, M. Zielinski, D. Zieminska, A. Zieminski, L. Zivkovic, V. Zutshi, and E.G. Zverev

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Gluino, Luminosity (scattering theory), 010308 nuclear & particles physics, Bar (music), Astrophysics::High Energy Astrophysical Phenomena, Supergravity, High Energy Physics::Phenomenology, Tevatron, 7. Clean energy, 01 natural sciences, law.invention, Transverse plane, law, 0103 physical sciences, High Energy Physics::Experiment, Fermilab, Nuclear Experiment, 010306 general physics, Collider
Abstract

A data sample corresponding to an integrated luminosity of 2.1 fb(-1) collected by the D phi detector at the Fermilab Tevatron Collider was analyzed to search for squarks and gluinos produced in p (p) over bar collisions at a center-of-mass energy of 1.96 TeV. No evidence for the production of such particles was observed in topologies involving jets and missing transverse energy, and 95% C.L. lower limits of 379 GeV and 308 GeV were set on the squark and gluino masses, respectively, within the framework of minimal supergravity with tan beta = 3, A(0) = 0, and mu < 0. The corresponding previous limits are improved by 54 GeV and 67 GeV.

Published
2008

45. Search for supersymmetry in di-photon final states at s=1.96 TeV

Author

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, T. Adams, E. Aguilo, S.H. Ahn, M. Ahsan, G.D. Alexeev, G. Alkhazov, A. Alton, G. Alverson, G.A. Alves, M. Anastasoaie, L.S. Ancu, T. Andeen, S. Anderson, B. Andrieu, M.S. Anzelc, Y. Arnoud, M. Arov, M. Arthaud, A. Askew, B. Åsman, A.C.S. Assis Jesus, O. Atramentov, C. Autermann, C. Avila, C. Ay, F. Badaud, A. Baden, L. Bagby, B. Baldin, D.V. Bandurin, S. Banerjee, P. Banerjee, E. Barberis, A.-F. Barfuss, P. Bargassa, P. Baringer, J. Barreto, J.F. Bartlett, U. Bassler, D. Bauer, S. Beale, A. Bean, M. Begalli, M. Begel, C. Belanger-Champagne, L. Bellantoni, A. Bellavance, J.A. Benitez, S.B. Beri, G. Bernardi, R. Bernhard, I. Bertram, M. Besançon, R. Beuselinck, V.A. Bezzubov, P.C. Bhat, V. Bhatnagar, C. Biscarat, G. Blazey, F. Blekman, S. Blessing, D. Bloch, K. Bloom, A. Boehnlein, D. Boline, T.A. Bolton, G. Borissov, T. Bose, A. Brandt, R. Brock, G. Brooijmans, A. Bross, D. Brown, N.J. Buchanan, D. Buchholz, M. Buehler, V. Buescher, S. Bunichev, S. Burdin, S. Burke, T.H. Burnett, C.P. Buszello, J.M. Butler, P. Calfayan, S. Calvet, J. Cammin, W. Carvalho, B.C.K. Casey, N.M. Cason, H. Castilla-Valdez, S. Chakrabarti, D. Chakraborty, K.M. Chan, K. Chan, A. Chandra, F. Charles, E. Cheu, F. Chevallier, D.K. Cho, S. Choi, B. Choudhary, L. Christofek, T. Christoudias, S. Cihangir, D. Claes, Y. Coadou, M. Cooke, W.E. Cooper, M. Corcoran, F. Couderc, M.-C. Cousinou, S. Crépé-Renaudin, D. Cutts, M. Ćwiok, H. da Motta, A. Das, G. Davies, K. De, S.J. de Jong, E. De La Cruz-Burelo, C. De Oliveira Martins, J.D. Degenhardt, F. Déliot, M. Demarteau, R. Demina, D. Denisov, S.P. Denisov, S. Desai, H.T. Diehl, M. Diesburg, A. Dominguez, H. Dong, L.V. Dudko, L. Duflot, S.R. Dugad, D. Duggan, A. Duperrin, J. Dyer, A. Dyshkant, M. Eads, D. Edmunds, J. Ellison, V.D. Elvira, Y. Enari, S. Eno, P. Ermolov, H. Evans, A. Evdokimov, V.N. Evdokimov, A.V. Ferapontov, T. Ferbel, F. Fiedler, F. Filthaut, W. Fisher, H.E. Fisk, M. Ford, M. Fortner, H. Fox, S. Fu, S. Fuess, T. Gadfort, C.F. Galea, E. Gallas, E. Galyaev, C. Garcia, A. Garcia-Bellido, V. Gavrilov, P. Gay, W. Geist, D. Gelé, C.E. Gerber, Yu. Gershtein, D. Gillberg, G. Ginther, N. Gollub, B. Gómez, A. Goussiou, P.D. Grannis, H. Greenlee, Z.D. Greenwood, E.M. Gregores, G. Grenier, Ph. Gris, J.-F. Grivaz, A. Grohsjean, S. Grünendahl, M.W. Grünewald, J. Guo, F. Guo, P. Gutierrez, G. Gutierrez, A. Haas, N.J. Hadley, P. Haefner, S. Hagopian, J. Haley, I. Hall, R.E. Hall, L. Han, K. Hanagaki, P. Hansson, K. Harder, A. Harel, R. Harrington, J.M. Hauptman, R. Hauser, J. Hays, T. Hebbeker, D. Hedin, J.G. Hegeman, J.M. Heinmiller, A.P. Heinson, U. Heintz, C. Hensel, K. Herner, G. Hesketh, M.D. Hildreth, R. Hirosky, J.D. Hobbs, B. Hoeneisen, H. Hoeth, M. Hohlfeld, S.J. Hong, S. Hossain, P. Houben, Y. Hu, Z. Hubacek, V. Hynek, I. Iashvili, R. Illingworth, A.S. Ito, S. Jabeen, M. Jaffré, S. Jain, K. Jakobs, C. Jarvis, R. Jesik, K. Johns, C. Johnson, M. Johnson, A. Jonckheere, P. Jonsson, A. Juste, D. Käfer, E. Kajfasz, A.M. Kalinin, J.R. Kalk, J.M. Kalk, S. Kappler, D. Karmanov, P. Kasper, I. Katsanos, D. Kau, R. Kaur, V. Kaushik, R. Kehoe, S. Kermiche, N. Khalatyan, A. Khanov, A. Kharchilava, Y.M. Kharzheev, D. Khatidze, H. Kim, T.J. Kim, M.H. Kirby, M. Kirsch, B. Klima, J.M. Kohli, J.-P. Konrath, M. Kopal, V.M. Korablev, A.V. Kozelov, D. Krop, T. Kuhl, A. Kumar, S. Kunori, A. Kupco, T. Kurča, J. Kvita, F. Lacroix, D. Lam, S. Lammers, G. Landsberg, P. Lebrun, W.M. Lee, A. Leflat, F. Lehner, J. Lellouch, J. Leveque, P. Lewis, J. Li, Q.Z. Li, L. Li, S.M. Lietti, J.G.R. Lima, D. Lincoln, J. Linnemann, V.V. Lipaev, R. Lipton, Y. Liu, Z. Liu, L. Lobo, A. Lobodenko, M. Lokajicek, P. Love, H.J. Lubatti, A.L. Lyon, A.K.A. Maciel, D. Mackin, R.J. Madaras, P. Mättig, C. Magass, A. Magerkurth, P.K. Mal, H.B. Malbouisson, S. Malik, V.L. Malyshev, H.S. Mao, Y. Maravin, B. Martin, R. McCarthy, A. Melnitchouk, A. Mendes, L. Mendoza, P.G. Mercadante, M. Merkin, K.W. Merritt, J. Meyer, A. Meyer, T. Millet, J. Mitrevski, J. Molina, R.K. Mommsen, N.K. Mondal, R.W. Moore, T. Moulik, G.S. Muanza, M. Mulders, M. Mulhearn, O. Mundal, L. Mundim, E. Nagy, M. Naimuddin, M. Narain, N.A. Naumann, H.A. Neal, J.P. Negret, P. Neustroev, H. Nilsen, H. Nogima, A. Nomerotski, S.F. Novaes, T. Nunnemann, V. O'Dell, D.C. O'Neil, G. Obrant, C. Ochando, D. Onoprienko, N. Oshima, J. Osta, R. Otec, G.J. Otero y Garzón, M. Owen, P. Padley, M. Pangilinan, N. Parashar, S.-J. Park, S.K. Park, J. Parsons, R. Partridge, N. Parua, A. Patwa, G. Pawloski, B. Penning, M. Perfilov, K. Peters, Y. Peters, P. Pétroff, M. Petteni, R. Piegaia, J. Piper, M.-A. Pleier, P.L.M. Podesta-Lerma, V.M. Podstavkov, Y. Pogorelov, M.-E. Pol, P. Polozov, B.G. Pope, A.V. Popov, C. Potter, W.L. Prado da Silva, H.B. Prosper, S. Protopopescu, J. Qian, A. Quadt, B. Quinn, A. Rakitine, M.S. Rangel, K. Ranjan, P.N. Ratoff, P. Renkel, S. Reucroft, P. Rich, M. Rijssenbeek, I. Ripp-Baudot, F. Rizatdinova, S. Robinson, R.F. Rodrigues, M. Rominsky, C. Royon, P. Rubinov, R. Ruchti, G. Safronov, G. Sajot, A. Sánchez-Hernández, M.P. Sanders, A. Santoro, G. Savage, L. Sawyer, T. Scanlon, D. Schaile, R.D. Schamberger, Y. Scheglov, H. Schellman, P. Schieferdecker, T. Schliephake, C. Schwanenberger, A. Schwartzman, R. Schwienhorst, J. Sekaric, H. Severini, E. Shabalina, M. Shamim, V. Shary, A.A. Shchukin, R.K. Shivpuri, V. Siccardi, V. Simak, V. Sirotenko, P. Skubic, P. Slattery, D. Smirnov, J. Snow, G.R. Snow, S. Snyder, S. Söldner-Rembold, L. Sonnenschein, A. Sopczak, M. Sosebee, K. Soustruznik, M. Souza, B. Spurlock, J. Stark, J. Steele, V. Stolin, D.A. Stoyanova, J. Strandberg, S. Strandberg, M.A. Strang, M. Strauss, E. Strauss, R. Ströhmer, D. Strom, L. Stutte, S. Sumowidagdo, P. Svoisky, A. Sznajder, M. Talby, P. Tamburello, A. Tanasijczuk, W. Taylor, J. Temple, B. Tiller, F. Tissandier, M. Titov, V.V. Tokmenin, T. Toole, I. Torchiani, T. Trefzger, D. Tsybychev, B. Tuchming, C. Tully, P.M. Tuts, R. Unalan, S. Uvarov, L. Uvarov, S. Uzunyan, B. Vachon, P.J. van den Berg, R. Van Kooten, W.M. van Leeuwen, N. Varelas, E.W. Varnes, I.A. Vasilyev, M. Vaupel, P. Verdier, L.S. Vertogradov, M. Verzocchi, F. Villeneuve-Seguier, P. Vint, P. Vokac, E. Von Toerne, M. Voutilainen, R. Wagner, H.D. Wahl, L. Wang, M.H.L.S. Wang, J. Warchol, G. Watts, M. Wayne, M. Weber, G. Weber, A. Wenger, N. Wermes, M. Wetstein, A. White, D. Wicke, G.W. Wilson, S.J. Wimpenny, M. Wobisch, D.R. Wood, T.R. Wyatt, Y. Xie, S. Yacoob, R. Yamada, M. Yan, T. Yasuda, Y.A. Yatsunenko, K. Yip, H.D. Yoo, S.W. Youn, J. Yu, A. Zatserklyaniy, C. Zeitnitz, T. Zhao, B. Zhou, J. Zhu, M. Zielinski, D. Zieminska, A. Zieminski, L. Zivkovic, V. Zutshi, and E.G. Zverev

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Tevatron, Supersymmetry, 01 natural sciences, Standard Model, Nuclear physics, Chargino, 0103 physical sciences, Neutralino, High Energy Physics::Experiment, Gravitino, Fermilab, Symmetry breaking, 010306 general physics
Abstract

We report results of a search for supersymmetry (SUSY) with gauge-mediated symmetry breaking in di-photon events collected by the DO experiment at the Fermilab Tevatron Collider in 2002-2006. In 1.1 fb(-1) of data, we find no significant excess beyond the background expected from the standard model and set the most stringent lower limits to date for a standard benchmark model on the lightest neutralino and chargino masses of 125 GeV and 229 GeV, respectively, at 95% confidence.

Published
2008

46. Measurement of the ratios of the Z/γ∗+⩾n jet production cross sections to the total inclusive Z/γ∗ cross section in pp¯ collisions at s=1.96 TeV

Author

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, T. Adams, M. Agelou, S.H. Ahn, M. Ahsan, G.D. Alexeev, G. Alkhazov, A. Alton, G. Alverson, G.A. Alves, M. Anastasoaie, T. Andeen, S. Anderson, B. Andrieu, M.S. Anzelc, Y. Arnoud, M. Arov, A. Askew, B. Åsman, A.C.S. Assis Jesus, O. Atramentov, C. Autermann, C. Avila, C. Ay, F. Badaud, A. Baden, L. Bagby, B. Baldin, D.V. Bandurin, P. Banerjee, S. Banerjee, E. Barberis, P. Bargassa, P. Baringer, C. Barnes, J. Barreto, J.F. Bartlett, U. Bassler, D. Bauer, A. Bean, M. Begalli, M. Begel, C. Belanger-Champagne, L. Bellantoni, A. Bellavance, J.A. Benitez, S.B. Beri, G. Bernardi, R. Bernhard, L. Berntzon, I. Bertram, M. Besançon, R. Beuselinck, V.A. Bezzubov, P.C. Bhat, V. Bhatnagar, M. Binder, C. Biscarat, K.M. Black, I. Blackler, G. Blazey, F. Blekman, S. Blessing, D. Bloch, K. Bloom, U. Blumenschein, A. Boehnlein, O. Boeriu, T.A. Bolton, G. Borissov, K. Bos, T. Bose, A. Brandt, R. Brock, G. Brooijmans, A. Bross, D. Brown, N.J. Buchanan, D. Buchholz, M. Buehler, V. Buescher, S. Burdin, S. Burke, T.H. Burnett, E. Busato, C.P. Buszello, J.M. Butler, P. Calfayan, S. Calvet, J. Cammin, S. Caron, W. Carvalho, B.C.K. Casey, N.M. Cason, H. Castilla-Valdez, D. Chakraborty, K.M. Chan, A. Chandra, F. Charles, E. Cheu, F. Chevallier, D.K. Cho, S. Choi, B. Choudhary, L. Christofek, D. Claes, B. Clément, C. Clément, Y. Coadou, M. Cooke, W.E. Cooper, D. Coppage, M. Corcoran, M.-C. Cousinou, B. Cox, S. Crépé-Renaudin, D. Cutts, M. Ćwiok, H. da Motta, A. Das, M. Das, B. Davies, G. Davies, G.A. Davis, K. De, P. de Jong, S.J. de Jong, E. De La Cruz-Burelo, C. De Oliveira Martins, J.D. Degenhardt, F. Déliot, M. Demarteau, R. Demina, P. Demine, D. Denisov, S.P. Denisov, S. Desai, H.T. Diehl, M. Diesburg, M. Doidge, A. Dominguez, H. Dong, L.V. Dudko, L. Duflot, S.R. Dugad, D. Duggan, A. Duperrin, J. Dyer, A. Dyshkant, M. Eads, D. Edmunds, T. Edwards, J. Ellison, J. Elmsheuser, V.D. Elvira, S. Eno, P. Ermolov, H. Evans, A. Evdokimov, V.N. Evdokimov, S.N. Fatakia, L. Feligioni, A.V. Ferapontov, T. Ferbel, F. Fiedler, F. Filthaut, W. Fisher, H.E. Fisk, I. Fleck, M. Ford, M. Fortner, H. Fox, S. Fu, S. Fuess, T. Gadfort, C.F. Galea, E. Gallas, E. Galyaev, C. Garcia, A. Garcia-Bellido, J. Gardner, V. Gavrilov, A. Gay, P. Gay, D. Gelé, R. Gelhaus, C.E. Gerber, Y. Gershtein, D. Gillberg, G. Ginther, N. Gollub, B. Gómez, A. Goussiou, P.D. Grannis, H. Greenlee, Z.D. Greenwood, E.M. Gregores, G. Grenier, Ph. Gris, J.-F. Grivaz, S. Grünendahl, M.W. Grünewald, F. Guo, J. Guo, G. Gutierrez, P. Gutierrez, A. Haas, N.J. Hadley, P. Haefner, S. Hagopian, J. Haley, I. Hall, R.E. Hall, L. Han, K. Hanagaki, K. Harder, A. Harel, R. Harrington, J.M. Hauptman, R. Hauser, J. Hays, T. Hebbeker, D. Hedin, J.G. Hegeman, J.M. Heinmiller, A.P. Heinson, U. Heintz, C. Hensel, K. Herner, G. Hesketh, M.D. Hildreth, R. Hirosky, J.D. Hobbs, B. Hoeneisen, H. Hoeth, M. Hohlfeld, S.J. Hong, R. Hooper, P. Houben, Y. Hu, Z. Hubacek, V. Hynek, I. Iashvili, R. Illingworth, A.S. Ito, S. Jabeen, M. Jaffré, S. Jain, K. Jakobs, C. Jarvis, A. Jenkins, R. Jesik, K. Johns, C. Johnson, M. Johnson, A. Jonckheere, P. Jonsson, A. Juste, D. Käfer, S. Kahn, E. Kajfasz, A.M. Kalinin, J.M. Kalk, J.R. Kalk, S. Kappler, D. Karmanov, J. Kasper, P. Kasper, I. Katsanos, D. Kau, R. Kaur, R. Kehoe, S. Kermiche, N. Khalatyan, A. Khanov, A. Kharchilava, Y.M. Kharzheev, D. Khatidze, H. Kim, T.J. Kim, M.H. Kirby, B. Klima, J.M. Kohli, J.-P. Konrath, M. Kopal, V.M. Korablev, J. Kotcher, B. Kothari, A. Koubarovsky, A.V. Kozelov, J. Kozminski, D. Krop, A. Kryemadhi, T. Kuhl, A. Kumar, S. Kunori, A. Kupco, T. Kurča, J. Kvita, S. Lammers, G. Landsberg, J. Lazoflores, A.-C. Le Bihan, P. Lebrun, W.M. Lee, A. Leflat, F. Lehner, V. Lesne, J. Leveque, P. Lewis, J. Li, Q.Z. Li, J.G.R. Lima, D. Lincoln, J. Linnemann, V.V. Lipaev, R. Lipton, Z. Liu, L. Lobo, A. Lobodenko, M. Lokajicek, A. Lounis, P. Love, H.J. Lubatti, M. Lynker, A.L. Lyon, A.K.A. Maciel, R.J. Madaras, P. Mättig, C. Magass, A. Magerkurth, A.-M. Magnan, N. Makovec, P.K. Mal, H.B. Malbouisson, S. Malik, V.L. Malyshev, H.S. Mao, Y. Maravin, M. Martens, R. McCarthy, D. Meder, A. Melnitchouk, A. Mendes, L. Mendoza, M. Merkin, K.W. Merritt, A. Meyer, J. Meyer, M. Michaut, H. Miettinen, T. Millet, J. Mitrevski, J. Molina, N.K. Mondal, J. Monk, R.W. Moore, T. Moulik, G.S. Muanza, M. Mulders, M. Mulhearn, L. Mundim, Y.D. Mutaf, E. Nagy, M. Naimuddin, M. Narain, N.A. Naumann, H.A. Neal, J.P. Negret, P. Neustroev, C. Noeding, A. Nomerotski, S.F. Novaes, T. Nunnemann, V. O'Dell, D.C. O'Neil, G. Obrant, V. Oguri, N. Oliveira, N. Oshima, R. Otec, G.J. Otero y Garzón, M. Owen, P. Padley, N. Parashar, S.-J. Park, S.K. Park, J. Parsons, R. Partridge, N. Parua, A. Patwa, G. Pawloski, P.M. Perea, E. Perez, K. Peters, P. Pétroff, M. Petteni, R. Piegaia, J. Piper, M.-A. Pleier, P.L.M. Podesta-Lerma, V.M. Podstavkov, Y. Pogorelov, M.-E. Pol, A. Pompoš, B.G. Pope, A.V. Popov, C. Potter, W.L. Prado da Silva, H.B. Prosper, S. Protopopescu, J. Qian, A. Quadt, B. Quinn, M.S. Rangel, K.J. Rani, K. Ranjan, P.N. Ratoff, P. Renkel, S. Reucroft, M. Rijssenbeek, I. Ripp-Baudot, F. Rizatdinova, S. Robinson, R.F. Rodrigues, C. Royon, P. Rubinov, R. Ruchti, V.I. Rud, G. Sajot, A. Sánchez-Hernández, M.P. Sanders, A. Santoro, G. Savage, L. Sawyer, T. Scanlon, D. Schaile, R.D. Schamberger, Y. Scheglov, H. Schellman, P. Schieferdecker, C. Schmitt, C. Schwanenberger, A. Schwartzman, R. Schwienhorst, J. Sekaric, S. Sengupta, H. Severini, E. Shabalina, M. Shamim, V. Shary, A.A. Shchukin, W.D. Shephard, R.K. Shivpuri, D. Shpakov, V. Siccardi, R.A. Sidwell, V. Simak, V. Sirotenko, P. Skubic, P. Slattery, R.P. Smith, G.R. Snow, J. Snow, S. Snyder, S. Söldner-Rembold, X. Song, L. Sonnenschein, A. Sopczak, M. Sosebee, K. Soustruznik, M. Souza, B. Spurlock, J. Stark, J. Steele, V. Stolin, A. Stone, D.A. Stoyanova, J. Strandberg, S. Strandberg, M.A. Strang, M. Strauss, R. Ströhmer, D. Strom, M. Strovink, L. Stutte, S. Sumowidagdo, A. Sznajder, M. Talby, P. Tamburello, W. Taylor, P. Telford, J. Temple, B. Tiller, M. Titov, V.V. Tokmenin, M. Tomoto, T. Toole, I. Torchiani, S. Towers, T. Trefzger, S. Trincaz-Duvoid, D. Tsybychev, B. Tuchming, C. Tully, A.S. Turcot, P.M. Tuts, R. Unalan, L. Uvarov, S. Uvarov, S. Uzunyan, B. Vachon, P.J. van den Berg, R. Van Kooten, W.M. van Leeuwen, N. Varelas, E.W. Varnes, A. Vartapetian, I.A. Vasilyev, M. Vaupel, P. Verdier, L.S. Vertogradov, M. Verzocchi, F. Villeneuve-Seguier, P. Vint, J.-R. Vlimant, E. Von Toerne, M. Voutilainen, M. Vreeswijk, H.D. Wahl, L. Wang, M.H.L.S. Wang, J. Warchol, G. Watts, M. Wayne, M. Weber, H. Weerts, N. Wermes, M. Wetstein, A. White, D. Wicke, G.W. Wilson, S.J. Wimpenny, M. Wobisch, J. Womersley, D.R. Wood, T.R. Wyatt, Y. Xie, N. Xuan, S. Yacoob, R. Yamada, M. Yan, T. Yasuda, Y.A. Yatsunenko, K. Yip, H.D. Yoo, S.W. Youn, C. Yu, J. Yu, A. Yurkewicz, A. Zatserklyaniy, C. Zeitnitz, D. Zhang, T. Zhao, B. Zhou, J. Zhu, M. Zielinski, D. Zieminska, A. Zieminski, V. Zutshi, and E.G. Zverev

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Tevatron, Jet (particle physics), 01 natural sciences, 7. Clean energy, Hadronization, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Center of mass, 010306 general physics, Parton shower, Boson
Abstract

We present a study of events with Z bosons and jets produced at the Fermilab Tevatron Collider in ppbar collisions at a center of mass energy of 1.96 TeV. The data sample consists of nearly 14,000 Z/G* -> e+e- candidates corresponding to the integrated luminosity of 340 pb-1 collected using the D0 detector. Ratios of the Z/G* + >= n jet cross sections to the total inclusive Z/G* cross section have been measured for n = 1 to 4 jet events. Our measurements are found to be in good agreement with a next-to-leading order QCD calculation and with a tree-level QCD prediction with parton shower simulation and hadronization.

Published
2008

47. Erratum to: 'Measurement of the isolated photon cross section in pp¯ collisions at s=1.96 TeV' [Phys. Lett. B 639 (2006) 151]

Author

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, T. Adams, E. Aguilo, S.H. Ahn, M. Ahsan, G.D. Alexeev, G. Alkhazov, A. Alton, G. Alverson, G.A. Alves, M. Anastasoaie, L.S. Ancu, T. Andeen, S. Anderson, B. Andrieu, M.S. Anzelc, Y. Arnoud, M. Arov, M. Arthaud, A. Askew, B. Åsman, A.C.S. Assis Jesus, O. Atramentov, C. Autermann, C. Avila, C. Ay, F. Badaud, A. Baden, L. Bagby, B. Baldin, D.V. Bandurin, S. Banerjee, P. Banerjee, E. Barberis, A.-F. Barfuss, P. Bargassa, P. Baringer, J. Barreto, J.F. Bartlett, U. Bassler, D. Bauer, S. Beale, A. Bean, M. Begalli, M. Begel, C. Belanger-Champagne, L. Bellantoni, A. Bellavance, J.A. Benitez, S.B. Beri, G. Bernardi, R. Bernhard, L. Berntzon, I. Bertram, M. Besançon, R. Beuselinck, V.A. Bezzubov, P.C. Bhat, V. Bhatnagar, C. Biscarat, G. Blazey, F. Blekman, S. Blessing, D. Bloch, K. Bloom, A. Boehnlein, D. Boline, T.A. Bolton, G. Borissov, K. Bos, T. Bose, A. Brandt, R. Brock, G. Brooijmans, A. Bross, D. Brown, N.J. Buchanan, D. Buchholz, M. Buehler, V. Buescher, S. Burdin, S. Burke, T.H. Burnett, C.P. Buszello, J.M. Butler, P. Calfayan, S. Calvet, J. Cammin, S. Caron, W. Carvalho, B.C.K. Casey, N.M. Cason, H. Castilla-Valdez, S. Chakrabarti, D. Chakraborty, K.M. Chan, K. Chan, A. Chandra, F. Charles, E. Cheu, F. Chevallier, D.K. Cho, S. Choi, B. Choudhary, L. Christofek, T. Christoudias, S. Cihangir, D. Claes, C. Clément, B. Clément, Y. Coadou, M. Cooke, W.E. Cooper, M. Corcoran, F. Couderc, M.-C. Cousinou, S. Crépé-Renaudin, D. Cutts, M. Ćwiok, H. da Motta, A. Das, G. Davies, K. De, S.J. de Jong, P. de Jong, E. De La Cruz-Burelo, C. De Oliveira Martins, J.D. Degenhardt, F. Déliot, M. Demarteau, R. Demina, D. Denisov, S.P. Denisov, S. Desai, H.T. Diehl, M. Diesburg, A. Dominguez, H. Dong, L.V. Dudko, L. Duflot, S.R. Dugad, D. Duggan, A. Duperrin, J. Dyer, A. Dyshkant, M. Eads, D. Edmunds, J. Ellison, V.D. Elvira, Y. Enari, S. Eno, P. Ermolov, H. Evans, A. Evdokimov, V.N. Evdokimov, A.V. Ferapontov, T. Ferbel, F. Fiedler, F. Filthaut, W. Fisher, H.E. Fisk, M. Ford, M. Fortner, H. Fox, S. Fu, S. Fuess, T. Gadfort, C.F. Galea, E. Gallas, E. Galyaev, C. Garcia, A. Garcia-Bellido, V. Gavrilov, P. Gay, W. Geist, D. Gelé, C.E. Gerber, Y. Gershtein, D. Gillberg, G. Ginther, N. Gollub, B. Gómez, A. Goussiou, P.D. Grannis, H. Greenlee, Z.D. Greenwood, E.M. Gregores, G. Grenier, Ph. Gris, J.-F. Grivaz, A. Grohsjean, S. Grünendahl, M.W. Grünewald, J. Guo, F. Guo, P. Gutierrez, G. Gutierrez, A. Haas, N.J. Hadley, P. Haefner, S. Hagopian, J. Haley, I. Hall, R.E. Hall, L. Han, K. Hanagaki, P. Hansson, K. Harder, A. Harel, R. Harrington, J.M. Hauptman, R. Hauser, J. Hays, T. Hebbeker, D. Hedin, J.G. Hegeman, J.M. Heinmiller, A.P. Heinson, U. Heintz, C. Hensel, K. Herner, G. Hesketh, M.D. Hildreth, R. Hirosky, J.D. Hobbs, B. Hoeneisen, H. Hoeth, M. Hohlfeld, S.J. Hong, R. Hooper, S. Hossain, P. Houben, Y. Hu, Z. Hubacek, V. Hynek, I. Iashvili, R. Illingworth, A.S. Ito, S. Jabeen, M. Jaffré, S. Jain, K. Jakobs, C. Jarvis, R. Jesik, K. Johns, C. Johnson, M. Johnson, A. Jonckheere, P. Jonsson, A. Juste, D. Käfer, S. Kahn, E. Kajfasz, A.M. Kalinin, J.R. Kalk, J.M. Kalk, S. Kappler, D. Karmanov, J. Kasper, P. Kasper, I. Katsanos, D. Kau, R. Kaur, V. Kaushik, R. Kehoe, S. Kermiche, N. Khalatyan, A. Khanov, A. Kharchilava, Y.M. Kharzheev, D. Khatidze, H. Kim, T.J. Kim, M.H. Kirby, M. Kirsch, B. Klima, J.M. Kohli, J.-P. Konrath, M. Kopal, V.M. Korablev, B. Kothari, A.V. Kozelov, D. Krop, A. Kryemadhi, T. Kuhl, A. Kumar, S. Kunori, A. Kupco, T. Kurča, J. Kvita, F. Lacroix, D. Lam, S. Lammers, G. Landsberg, J. Lazoflores, P. Lebrun, W.M. Lee, A. Leflat, F. Lehner, J. Lellouch, V. Lesne, J. Leveque, P. Lewis, J. Li, Q.Z. Li, L. Li, S.M. Lietti, J.G.R. Lima, D. Lincoln, J. Linnemann, V.V. Lipaev, R. Lipton, Y. Liu, Z. Liu, L. Lobo, A. Lobodenko, M. Lokajicek, A. Lounis, P. Love, H.J. Lubatti, A.L. Lyon, A.K.A. Maciel, D. Mackin, R.J. Madaras, P. Mättig, C. Magass, A. Magerkurth, N. Makovec, P.K. Mal, H.B. Malbouisson, S. Malik, V.L. Malyshev, H.S. Mao, Y. Maravin, B. Martin, R. McCarthy, A. Melnitchouk, A. Mendes, L. Mendoza, P.G. Mercadante, M. Merkin, K.W. Merritt, J. Meyer, A. Meyer, M. Michaut, T. Millet, J. Mitrevski, J. Molina, R.K. Mommsen, N.K. Mondal, R.W. Moore, T. Moulik, G.S. Muanza, M. Mulders, M. Mulhearn, O. Mundal, L. Mundim, E. Nagy, M. Naimuddin, M. Narain, N.A. Naumann, H.A. Neal, J.P. Negret, P. Neustroev, H. Nilsen, A. Nomerotski, S.F. Novaes, T. Nunnemann, V. O'Dell, D.C. O'Neil, G. Obrant, C. Ochando, D. Onoprienko, N. Oshima, J. Osta, R. Otec, G.J. Otero y Garzón, M. Owen, P. Padley, M. Pangilinan, N. Parashar, S.-J. Park, S.K. Park, J. Parsons, R. Partridge, N. Parua, A. Patwa, G. Pawloski, B. Penning, P.M. Perea, K. Peters, Y. Peters, P. Pétroff, M. Petteni, R. Piegaia, J. Piper, M.-A. Pleier, P.L.M. Podesta-Lerma, V.M. Podstavkov, Y. Pogorelov, M.-E. Pol, P. Polozov, A. Pompoš, B.G. Pope, A.V. Popov, C. Potter, W.L. Prado da Silva, H.B. Prosper, S. Protopopescu, J. Qian, A. Quadt, B. Quinn, A. Rakitine, M.S. Rangel, K.J. Rani, K. Ranjan, P.N. Ratoff, P. Renkel, S. Reucroft, P. Rich, M. Rijssenbeek, I. Ripp-Baudot, F. Rizatdinova, S. Robinson, R.F. Rodrigues, C. Royon, P. Rubinov, R. Ruchti, G. Safronov, G. Sajot, A. Sánchez-Hernández, M.P. Sanders, A. Santoro, G. Savage, L. Sawyer, T. Scanlon, D. Schaile, R.D. Schamberger, Y. Scheglov, H. Schellman, P. Schieferdecker, T. Schliephake, C. Schmitt, C. Schwanenberger, A. Schwartzman, R. Schwienhorst, J. Sekaric, S. Sengupta, H. Severini, E. Shabalina, M. Shamim, V. Shary, A.A. Shchukin, R.K. Shivpuri, D. Shpakov, V. Siccardi, V. Simak, V. Sirotenko, P. Skubic, P. Slattery, D. Smirnov, R.P. Smith, J. Snow, G.R. Snow, S. Snyder, S. Söldner-Rembold, L. Sonnenschein, A. Sopczak, M. Sosebee, K. Soustruznik, M. Souza, B. Spurlock, J. Stark, J. Steele, V. Stolin, A. Stone, D.A. Stoyanova, J. Strandberg, S. Strandberg, M.A. Strang, M. Strauss, E. Strauss, R. Ströhmer, D. Strom, M. Strovink, L. Stutte, S. Sumowidagdo, P. Svoisky, A. Sznajder, M. Talby, P. Tamburello, A. Tanasijczuk, W. Taylor, P. Telford, J. Temple, B. Tiller, F. Tissandier, M. Titov, V.V. Tokmenin, M. Tomoto, T. Toole, I. Torchiani, T. Trefzger, D. Tsybychev, B. Tuchming, C. Tully, P.M. Tuts, R. Unalan, S. Uvarov, L. Uvarov, S. Uzunyan, B. Vachon, P.J. van den Berg, B. van Eijk, R. Van Kooten, W.M. van Leeuwen, N. Varelas, E.W. Varnes, A. Vartapetian, I.A. Vasilyev, M. Vaupel, P. Verdier, L.S. Vertogradov, M. Verzocchi, F. Villeneuve-Seguier, P. Vint, P. Vokac, E. Von Toerne, M. Voutilainen, M. Vreeswijk, R. Wagner, H.D. Wahl, L. Wang, M.H.L.S. Wang, J. Warchol, G. Watts, M. Wayne, M. Weber, G. Weber, H. Weerts, A. Wenger, N. Wermes, M. Wetstein, A. White, D. Wicke, G.W. Wilson, S.J. Wimpenny, M. Wobisch, D.R. Wood, T.R. Wyatt, Y. Xie, S. Yacoob, R. Yamada, M. Yan, T. Yasuda, Y.A. Yatsunenko, K. Yip, H.D. Yoo, S.W. Youn, J. Yu, C. Yu, A. Yurkewicz, A. Zatserklyaniy, C. Zeitnitz, D. Zhang, T. Zhao, B. Zhou, J. Zhu, M. Zielinski, D. Zieminska, A. Zieminski, L. Zivkovic, V. Zutshi, and E.G. Zverev

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Cross section (physics), Photon, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences
Abstract

Measurement of the isolated photon cross section in p(p)over-bar collisions at root s = 1.96 TeV (vol 639, pg 151, 2006)

Published
2008

48. Zγ production and limits on anomalous ZZγ and Zγγ couplings in pp¯ collisions at s=1.96 TeV

Author

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, T. Adams, E. Aguilo, S.H. Ahn, M. Ahsan, G.D. Alexeev, G. Alkhazov, A. Alton, G. Alverson, G.A. Alves, M. Anastasoaie, L.S. Ancu, T. Andeen, S. Anderson, B. Andrieu, M.S. Anzelc, Y. Arnoud, M. Arov, M. Arthaud, A. Askew, B. Åsman, A.C.S. Assis Jesus, O. Atramentov, C. Autermann, C. Avila, C. Ay, F. Badaud, A. Baden, L. Bagby, B. Baldin, D.V. Bandurin, P. Banerjee, S. Banerjee, E. Barberis, A.-F. Barfuss, P. Bargassa, P. Baringer, J. Barreto, J.F. Bartlett, U. Bassler, D. Bauer, S. Beale, A. Bean, M. Begalli, M. Begel, C. Belanger-Champagne, L. Bellantoni, A. Bellavance, J.A. Benitez, S.B. Beri, G. Bernardi, R. Bernhard, L. Berntzon, I. Bertram, M. Besançon, R. Beuselinck, V.A. Bezzubov, P.C. Bhat, V. Bhatnagar, C. Biscarat, G. Blazey, F. Blekman, S. Blessing, D. Bloch, K. Bloom, A. Boehnlein, D. Boline, T.A. Bolton, G. Borissov, K. Bos, T. Bose, A. Brandt, R. Brock, G. Brooijmans, A. Bross, D. Brown, N.J. Buchanan, D. Buchholz, M. Buehler, V. Buescher, S. Burdin, S. Burke, T.H. Burnett, C.P. Buszello, J.M. Butler, P. Calfayan, S. Calvet, J. Cammin, S. Caron, W. Carvalho, B.C.K. Casey, N.M. Cason, H. Castilla-Valdez, S. Chakrabarti, D. Chakraborty, K. Chan, K.M. Chan, A. Chandra, F. Charles, E. Cheu, F. Chevallier, D.K. Cho, S. Choi, B. Choudhary, L. Christofek, T. Christoudias, S. Cihangir, D. Claes, B. Clément, C. Clément, Y. Coadou, M. Cooke, W.E. Cooper, M. Corcoran, F. Couderc, M.-C. Cousinou, S. Crépé-Renaudin, D. Cutts, M. Ćwiok, H. da Motta, A. Das, G. Davies, K. De, P. de Jong, S.J. de Jong, E. De La Cruz-Burelo, C. De Oliveira Martins, J.D. Degenhardt, F. Déliot, M. Demarteau, R. Demina, D. Denisov, S.P. Denisov, S. Desai, H.T. Diehl, M. Diesburg, A. Dominguez, H. Dong, L.V. Dudko, L. Duflot, S.R. Dugad, D. Duggan, A. Duperrin, J. Dyer, A. Dyshkant, M. Eads, D. Edmunds, J. Ellison, V.D. Elvira, Y. Enari, S. Eno, P. Ermolov, H. Evans, A. Evdokimov, V.N. Evdokimov, A.V. Ferapontov, T. Ferbel, F. Fiedler, F. Filthaut, W. Fisher, H.E. Fisk, M. Ford, M. Fortner, H. Fox, S. Fu, S. Fuess, T. Gadfort, C.F. Galea, E. Gallas, E. Galyaev, C. Garcia, A. Garcia-Bellido, V. Gavrilov, P. Gay, W. Geist, D. Gelé, C.E. Gerber, Y. Gershtein, D. Gillberg, G. Ginther, N. Gollub, B. Gómez, A. Goussiou, P.D. Grannis, H. Greenlee, Z.D. Greenwood, E.M. Gregores, G. Grenier, Ph. Gris, J.-F. Grivaz, A. Grohsjean, S. Grünendahl, M.W. Grünewald, F. Guo, J. Guo, G. Gutierrez, P. Gutierrez, A. Haas, N.J. Hadley, P. Haefner, S. Hagopian, J. Haley, I. Hall, R.E. Hall, L. Han, K. Hanagaki, P. Hansson, K. Harder, A. Harel, R. Harrington, J.M. Hauptman, R. Hauser, J. Hays, T. Hebbeker, D. Hedin, J.G. Hegeman, J.M. Heinmiller, A.P. Heinson, U. Heintz, C. Hensel, K. Herner, G. Hesketh, M.D. Hildreth, R. Hirosky, J.D. Hobbs, B. Hoeneisen, H. Hoeth, M. Hohlfeld, S.J. Hong, R. Hooper, S. Hossain, P. Houben, Y. Hu, Z. Hubacek, V. Hynek, I. Iashvili, R. Illingworth, A.S. Ito, S. Jabeen, M. Jaffré, S. Jain, K. Jakobs, C. Jarvis, R. Jesik, K. Johns, C. Johnson, M. Johnson, A. Jonckheere, P. Jonsson, A. Juste, D. Käfer, S. Kahn, E. Kajfasz, A.M. Kalinin, J.M. Kalk, J.R. Kalk, S. Kappler, D. Karmanov, J. Kasper, P. Kasper, I. Katsanos, D. Kau, R. Kaur, V. Kaushik, R. Kehoe, S. Kermiche, N. Khalatyan, A. Khanov, A. Kharchilava, Y.M. Kharzheev, D. Khatidze, H. Kim, T.J. Kim, M.H. Kirby, M. Kirsch, B. Klima, J.M. Kohli, J.-P. Konrath, M. Kopal, V.M. Korablev, B. Kothari, A.V. Kozelov, D. Krop, A. Kryemadhi, T. Kuhl, A. Kumar, S. Kunori, A. Kupco, T. Kurča, J. Kvita, D. Lam, S. Lammers, G. Landsberg, J. Lazoflores, P. Lebrun, W.M. Lee, A. Leflat, F. Lehner, J. Lellouch, V. Lesne, J. Leveque, P. Lewis, J. Li, L. Li, Q.Z. Li, S.M. Lietti, J.G.R. Lima, D. Lincoln, J. Linnemann, V.V. Lipaev, R. Lipton, Y. Liu, Z. Liu, L. Lobo, A. Lobodenko, M. Lokajicek, A. Lounis, P. Love, H.J. Lubatti, A.L. Lyon, A.K.A. Maciel, D. Mackin, R.J. Madaras, P. Mättig, C. Magass, A. Magerkurth, N. Makovec, P.K. Mal, H.B. Malbouisson, S. Malik, V.L. Malyshev, H.S. Mao, Y. Maravin, B. Martin, R. McCarthy, A. Melnitchouk, A. Mendes, L. Mendoza, P.G. Mercadante, M. Merkin, K.W. Merritt, A. Meyer, J. Meyer, M. Michaut, T. Millet, J. Mitrevski, J. Molina, R.K. Mommsen, N.K. Mondal, R.W. Moore, T. Moulik, G.S. Muanza, M. Mulders, M. Mulhearn, O. Mundal, L. Mundim, E. Nagy, M. Naimuddin, M. Narain, N.A. Naumann, H.A. Neal, J.P. Negret, P. Neustroev, H. Nilsen, C. Noeding, A. Nomerotski, S.F. Novaes, T. Nunnemann, V. O'Dell, D.C. O'Neil, G. Obrant, C. Ochando, D. Onoprienko, N. Oshima, J. Osta, R. Otec, G.J. Otero y Garzón, M. Owen, P. Padley, M. Pangilinan, N. Parashar, S.-J. Park, S.K. Park, J. Parsons, R. Partridge, N. Parua, A. Patwa, G. Pawloski, P.M. Perea, K. Peters, Y. Peters, P. Pétroff, M. Petteni, R. Piegaia, J. Piper, M.-A. Pleier, P.L.M. Podesta-Lerma, V.M. Podstavkov, Y. Pogorelov, M.-E. Pol, A. Pompoš, B.G. Pope, A.V. Popov, C. Potter, W.L. Prado da Silva, H.B. Prosper, S. Protopopescu, J. Qian, A. Quadt, B. Quinn, A. Rakitine, M.S. Rangel, K.J. Rani, K. Ranjan, P.N. Ratoff, P. Renkel, S. Reucroft, P. Rich, M. Rijssenbeek, I. Ripp-Baudot, F. Rizatdinova, S. Robinson, R.F. Rodrigues, C. Royon, P. Rubinov, R. Ruchti, G. Safronov, G. Sajot, A. Sánchez-Hernández, M.P. Sanders, A. Santoro, G. Savage, L. Sawyer, T. Scanlon, D. Schaile, R.D. Schamberger, Y. Scheglov, H. Schellman, P. Schieferdecker, T. Schliephake, C. Schmitt, C. Schwanenberger, A. Schwartzman, R. Schwienhorst, J. Sekaric, S. Sengupta, H. Severini, E. Shabalina, M. Shamim, V. Shary, A.A. Shchukin, R.K. Shivpuri, D. Shpakov, V. Siccardi, V. Simak, V. Sirotenko, P. Skubic, P. Slattery, D. Smirnov, R.P. Smith, G.R. Snow, J. Snow, S. Snyder, S. Söldner-Rembold, L. Sonnenschein, A. Sopczak, M. Sosebee, K. Soustruznik, M. Souza, B. Spurlock, J. Stark, J. Steele, V. Stolin, A. Stone, D.A. Stoyanova, J. Strandberg, S. Strandberg, M.A. Strang, M. Strauss, R. Ströhmer, D. Strom, M. Strovink, L. Stutte, S. Sumowidagdo, P. Svoisky, A. Sznajder, M. Talby, P. Tamburello, A. Tanasijczuk, W. Taylor, P. Telford, J. Temple, B. Tiller, F. Tissandier, M. Titov, V.V. Tokmenin, M. Tomoto, T. Toole, I. Torchiani, T. Trefzger, D. Tsybychev, B. Tuchming, C. Tully, P.M. Tuts, R. Unalan, L. Uvarov, S. Uvarov, S. Uzunyan, B. Vachon, P.J. van den Berg, B. van Eijk, R. Van Kooten, W.M. van Leeuwen, N. Varelas, E.W. Varnes, A. Vartapetian, I.A. Vasilyev, M. Vaupel, P. Verdier, L.S. Vertogradov, M. Verzocchi, F. Villeneuve-Seguier, P. Vint, E. Von Toerne, M. Voutilainen, M. Vreeswijk, R. Wagner, H.D. Wahl, L. Wang, M.H.L. S Wang, J. Warchol, G. Watts, M. Wayne, G. Weber, M. Weber, H. Weerts, A. Wenger, N. Wermes, M. Wetstein, A. White, D. Wicke, G.W. Wilson, S.J. Wimpenny, M. Wobisch, D.R. Wood, T.R. Wyatt, Y. Xie, S. Yacoob, R. Yamada, M. Yan, T. Yasuda, Y.A. Yatsunenko, K. Yip, H.D. Yoo, S.W. Youn, C. Yu, J. Yu, A. Yurkewicz, A. Zatserklyaniy, C. Zeitnitz, D. Zhang, T. Zhao, B. Zhou, J. Zhu, M. Zielinski, D. Zieminska, A. Zieminski, L. Zivkovic, V. Zutshi, and E.G. Zverev

Subjects
Physics, Nuclear and High Energy Physics, Gauge boson, Particle physics, Muon, Large Hadron Collider, 010308 nuclear & particles physics, Tevatron, 01 natural sciences, 7. Clean energy, law.invention, Standard Model, Nuclear physics, law, 0103 physical sciences, High Energy Physics::Experiment, Fermilab, 010306 general physics, Collider, Lepton
Abstract

We present a study of eey and mu mu gamma events using 1109 (1009) pb-(1) of data in the electron (muon) channel, respectively. These data were collected with the DO detector at the Fermilab Tevatron pp collider at Is = 1.96 TeV. Having observed 453 (515) candidates in the eey (jtAy) final state, we measure the Z gamma production cross section for a photon with transverse energy ET > 7 GeV, separation between the photon and leptons Delta Rey > 0.7, and invariant mass of the di-lepton pair Mee > 30 GeV/(2)(c), to be 4.96 0.30(stat. + syst.) zE 0.30(lumi.) pb, in agreement with the Standard Model prediction of 4.74 0.22 pb. This is the most precise Zy cross section measurement at a hadron collider. We set limits on anomalous trilinear Zyy and ZZy gauge boson couplings of -0.085 < h(30)(y) < 0.084, -0.0053 < h(40)(y) < 0.0054 and -0.083 < h(30)(Z) < 0.082, 30 40 30 -0.0053 < h(40)(Z) < 0.0054 at the 95% C.L. for the form-factor scale A = 1.2 TeV. 40 .

Published
2007

49. The COMPASS experiment at CERN

Author

P. Abbon, E. Albrecht, V.Yu. Alexakhin, Yu. Alexandrov, G.D. Alexeev, M.G. Alekseev, A. Amoroso, H. Angerer, V.A. Anosov, B. Badełek, F. Balestra, J. Ball, J. Barth, G. Baum, M. Becker, Y. Bedfer, P. Berglund, C. Bernet, R. Bertini, M. Bettinelli, R. Birsa, J. Bisplinghoff, P. Bordalo, M. Bosteels, F. Bradamante, A. Braem, A. Bravar, A. Bressan, G. Brona, E. Burtin, M.P. Bussa, V.N. Bytchkov, M. Chalifour, A. Chapiro, M. Chiosso, P. Ciliberti, A. Cicuttin, M. Colantoni, A.A. Colavita, S. Costa, M.L. Crespo, P. Cristaudo, T. Dafni, N. d’Hose, S. Dalla Torre, C. d’Ambrosio, S. Das, S.S. Dasgupta, E. Delagnes, R. De Masi, P. Deck, N. Dedek, D. Demchenko, O.Yu. Denisov, L. Dhara, V. Diaz, N. Dibiase, A.M. Dinkelbach, A.V. Dolgopolov, A. Donati, S.V. Donskov, V.A. Dorofeev, N. Doshita, D. Durand, V. Duic, W. Dünnweber, A. Efremov, P.D. Eversheim, W. Eyrich, M. Faessler, V. Falaleev, P. Fauland, A. Ferrero, L. Ferrero, M. Finger, H. Fischer, C. Franco, J. Franz, F. Fratnik, J.M. Friedrich, V. Frolov, U. Fuchs, R. Garfagnini, L. Gatignon, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, R. Geyer, J.M. Gheller, A. Giganon, M. Giorgi, B. Gobbo, S. Goertz, A.M. Gorin, F. Gougnaud, S. Grabmüller, O.A. Grajek, A. Grasso, B. Grube, A. Grünemaier, A. Guskov, F. Haas, R. Hagemann, J. Hannappel, D. von Harrach, T. Hasegawa, J. Heckmann, S. Hedicke, F.H. Heinsius, R. Hermann, C. Heß, F. Hinterberger, M. von Hodenberg, N. Horikawa, S. Horikawa, I. Horn, C. Ilgner, A.I. Ioukaev, S. Ishimoto, I. Ivanchin, O. Ivanov, T. Iwata, R. Jahn, A. Janata, R. Joosten, N.I. Jouravlev, E. Kabuß, V. Kalinnikov, D. Kang, F. Karstens, W. Kastaun, B. Ketzer, G.V. Khaustov, Yu.A. Khokhlov, J. Kiefer, Yu. Kisselev, F. Klein, K. Klimaszewski, S. Koblitz, J.H. Koivuniemi, V.N. Kolosov, E.V. Komissarov, K. Kondo, K. Königsmann, A.K. Konoplyannikov, I. Konorov, V.F. Konstantinov, A.S. Korentchenko, A. Korzenev, A.M. Kotzinian, N.A. Koutchinski, O. Kouznetsov, K. Kowalik, D. Kramer, N.P. Kravchuk, G.V. Krivokhizhin, Z.V. Kroumchtein, J. Kubart, R. Kuhn, V. Kukhtin, F. Kunne, K. Kurek, N.A. Kuzmin, M. Lamanna, J.M. Le Goff, M. Leberig, A.A. Lednev, A. Lehmann, V. Levinski, S. Levorato, V. I Lyashenko, J. Lichtenstadt, T. Liska, I. Ludwig, A. Maggiora, M. Maggiora, A. Magnon, G.K. Mallot, A. Mann, I.V. Manuilov, C. Marchand, J. Marroncle, A. Martin, J. Marzec, L. Masek, F. Massmann, T. Matsuda, D. Matthiä, A.N. Maximov, G. Menon, W. Meyer, A. Mielech, Yu.V. Mikhailov, M.A. Moinester, F. Molinié, F. Mota, A. Mutter, T. Nagel, O. Nähle, J. Nassalski, S. Neliba, F. Nerling, D. Neyret, M. Niebuhr, T. Niinikoski, V.I. Nikolaenko, A.A. Nozdrin, A.G. Olshevsky, M. Ostrick, A. Padee, P. Pagano, S. Panebianco, B. Parsamyan, D. Panzieri, S. Paul, B. Pawlukiewicz, H. Pereira, D.V. Peshekhonov, V.D. Peshekhonov, D. Piedigrossi, G. Piragino, S. Platchkov, K. Platzer, J. Pochodzalla, J. Polak, V.A. Polyakov, G. Pontecorvo, A.A. Popov, J. Pretz, S. Procureur, C. Quintans, J.-F. Rajotte, S. Ramos, I. Razaq, P. Rebourgeard, D. Reggiani, G. Reicherz, A. Richter, F. Robinet, E. Rocco, E. Rondio, L. Ropelewski, J.Y. Roussé, A.M. Rozhdestvensky, D. Ryabchikov, A.G. Samartsev, V.D. Samoylenko, A. Sandacz, M. Sans Merce, H. Santos, M.G. Sapozhnikov, F. Sauli, I.A. Savin, P. Schiavon, C. Schill, T. Schmidt, H. Schmitt, L. Schmitt, P. Schönmeier, W. Schroeder, D. Seeharsch, M. Seimetz, D. Setter, A. Shaligin, O.Yu. Shevchenko, A.A. Shishkin, H.-W. Siebert, L. Silva, F. Simon, L. Sinha, A.N. Sissakian, M. Slunecka, G.I. Smirnov, D. Sora, S. Sosio, F. Sozzi, A. Srnka, F. Stinzing, M. Stolarski, V.P. Sugonyaev, M. Sulc, R. Sulej, G. Tarte, N. Takabayashi, V.V. Tchalishev, S. Tessaro, F. Tessarotto, A. Teufel, D. Thers, L.G. Tkatchev, T. Toeda, V.V. Tokmenin, S. Trippel, J. Urban, R. Valbuena, G. Venugopal, M. Virius, N.V. Vlassov, A. Vossen, M. Wagner, R. Webb, E. Weise, Q. Weitzel, U. Wiedner, M. Wiesmann, R. Windmolders, S. Wirth, W. Wiślicki, H. Wollny, A.M. Zanetti, K. Zaremba, M. Zavertyaev, J. Zhao, R. Ziegler, M. Ziembicki, Y.L. Zlobin, A. Zvyagin, Abbon, P, Albrecht, E, ALEXAKHIN V., Yu, Alexandrov, Yu, ALEXEEV G., D, ALEKSEEV M., G, Amoroso, A, Angerer, H, ANOSOV V., A, Badelek, B, Balestra, F, Ball, J, Barth, J, Baum, G, Becker, M, Bedfer, Y, Berglund, P, Bernet, C, Bertini, R, Bettinelli, M, Birsa, R, Bisplinghoff, J, Bordalo, P, Bosteels, M, Bradamante, Franco, Braem, A, Bravar, A, Bressan, Andrea, Brona, G, Burtin, E, BUSSA M., P, BYTCHKOV V., N, Chalifour, M, Chapiro, A, Chiosso, M, Ciliberti, Piero, Cicuttin, A, Colantoni, M, COLAVITA A., A, Costa, S, CRESPO M., L, Cristaudo, P, Dafni, T, D'Hose, N, DALLA TORRE, S, D'Ambrosio, C, Das, S, DASGUPTA S., S, Delagnes, E, DE MASI, R, Deck, P, Dedek, N, Demchenko, D, DENISOV O., Yu, Dhara, L, Diaz, V, Dibiase, N, DINKELBACH A., M, DOLGOPOLOV A., V, Donati, A, DONSKOV S., V, DOROFEEV V., A, Doshita, N, Durand, D, Duic, V, Dünnweber, W, Efremov, A, EVERSHEIM P., D, Eyrich, W, Faessler, M, Falaleev, V, Fauland, P, Ferrero, A, Ferrero, L, Finger, M, FINGER M., Jr, Fischer, H, Franco, C, Franz, J, Fratnik, F, FRIEDRICH J., M, Frolov, V, Fuchs, U, Garfagnini, R, Gatignon, L, Gautheron, F, GAVRICHTCHOUK O., P, Gerassimov, S, Geyer, R, GHELLER J., M, Giganon, A, Giorgi, Marcello, Gobbo, B, Goertz, S, GORIN A., M, Gougnaud, F, Grabmüller, S, GRAJEK O., A, Grasso, A, Grube, B, Grünemaier, A, Guskov, A, Haas, F, Hagemann, R, Hannappel, J, VON HARRACH, D, Hasegawa, T, Heckmann, J, Hedicke, S, HEINSIUS F., H, Hermann, R, Hess, C, Hinterberger, F, VON HODENBERG, M, Horikawa, N, Horikawa, S, Horn, I, Ilgner, C, IOUKAEV A., I, Ishimoto, S, Ivanchin, I, Ivanov, O, Iwata, T, Jahn, R, Janata, A, Joosten, R, JOURAVLEV N., I, Kabuss, E, Kalinnikov, V, Kang, D, Karstens, F, Kastaun, W, Ketzer, B, KHAUSTOV G., V, KHOKHLOV Y. U., A, Kiefer, J, Kisselev, Yu, Klein, F, Klimaszewski, K, Koblitz, S, KOIVUNIEMI J., H, KOLOSOV V., N, KOMISSAROV E., V, Kondo, K, Königsmann, K, KONOPLYANNIKOV A., K, Konorov, I, KONSTANTINOV V., F, KORENTCHENKO A., S, Korzenev, A, KOTZINIAN A., M, KOUTCHINSKI N., A, Kouznetsov, O, Kowalik, K, Kramer, D, KRAVCHUK N., P, KRIVOKHIZHIN G., V, KROUMCHTEIN Z., V, Kubart, J, Kuhn, R, Kukhtin, V, Kunne, F, Kurek, K, KUZMIN N., A, Lamanna, M, LE GOFF J., M, Leberig, M, LEDNEV A., A, Lehmann, A, Levinski, V, Levorato, Stefano, I., LYASHENKO V, Lichtenstadt, J, Liska, T, Ludwig, I, Maggiora, A, Maggiora, M, Magnon, A, MALLOT G., K, Mann, A, MANUILOV I., V, Marchand, C, Marroncle, J, Martin, Anna, Marzec, J, Masek, L, Massmann, F, Matsuda, T, Matthiä, D, MAXIMOV A., N, Menon, G, Meyer, W, Mielech, A, MIKHAILOV Y. U., V, MOINESTER M., A, Molinié, F, Mota, F, Mutter, A, Nagel, T, Nähle, O, Nassalski, J, Neliba, S, Nerling, F, Neyret, D, Niebuhr, M, Niinikoski, T, NIKOLAENKO V., I, NOZDRIN A., A, OLSHEVSKY A., G, Ostrick, M, Padee, A, Pagano, P, Panebianco, S, Parsamyan, B, Panzieri, D, Paul, S, Pawlukiewicz, B, Pereira, H, PESHEKHONOV D., V, PESHEKHONOV V., D, Piedigrossi, D, Piragino, G, Platchkov, S, Platzer, K, Pochodzalla, J, Polak, J, POLYAKOV V., A, Pontecorvo, G, POPOV A., A, Pretz, J, Procureur, S, Quintans, C, RAJOTTE J., F, Ramos, S, Razaq, I, Rebourgeard, P, Reggiani, D, Reicherz, G, Richter, A, Robinet, F, Rocco, E, Rondio, E, Ropelewski, L, ROUSSÉ J., Y, ROZHDESTVENSKY A., M, Ryabchikov, D, SAMARTSEV A., G, SAMOYLENKO V., D, Sandacz, A, SANS MERCE, M, Santos, H, SAPOZHNIKOV M., G, Sauli, F, SAVIN I., A, Schiavon, Paolo, Schill, C, Schmidt, T, Schmitt, H, Schmitt, L, Schönmeier, P, Schroeder, W, Seeharsch, D, Seimetz, M, Setter, D, Shaligin, A, SHEVCHENKO O., Yu, SHISHKIN A., A, SIEBERT H., W, Silva, L, Simon, F, Sinha, L, SISSAKIAN A., N, Slunecka, M, SMIRNOV G., I, Sora, D, Sosio, S, Sozzi, F, Srnka, A, Stinzing, F, Stolarski, M, SUGONYAEV V., P, Sulc, M, Sulej, R, Tarte, G, Takabayashi, N, TCHALISHEV V., V, Tessaro, S, Tessarotto, F, Teufel, A, Thers, D, TKATCHEV L., G, Toeda, T, TOKMENIN V., V, Trippel, S, Urban, J, Valbuena, R, Venugopal, G, Virius, M, VLASSOV N., V, Vossen, A, Wagner, M, Webb, R, Weise, E, Weitzel, Q, Wiedner, U, Wiesmann, M, Windmolders, R, Wirth, S, Wisblicki, W, Wollny, H, ZANETTI A., M, Zaremba, K, Zavertyaev, M, Zhao, J, Ziegler, R, Ziembicki, M, ZLOBIN Y., L, and Zvyagin, A.

Subjects
Nuclear and High Energy Physics, straw tube detector, Physics::Instrumentation and Detectors, Project commissioning, FOS: Physical sciences, fixed-target experiment, RICH detector, hadron structure, High Energy Physics - Experiment, target, MWPC, Nuclear physics, High Energy Physics - Experiment (hep-ex), Compass, Hadron spectroscopy, COMPASS experiment, scintillating fibre detector, Nuclear Experiment, silicon microstrip detectors, Instrumentation, Silicon microstrip detectors, Physics, Large Hadron Collider, Structure function, MicroMegas detector, front-end electronics, DAQ, micromegas detector, drift chamber, Physics::Accelerator Physics, High Energy Physics::Experiment, polarised, GEM detector, calorimetry, Particle Physics - Experiment, polarised DIS
Abstract

The COMPASS experiment makes use of the CERN SPS high-intensitymuon and hadron beams for the investigation of the nucleon spin structure and the spectroscopy of hadrons. One or more outgoing particles are detected in coincidence with the incoming muon or hadron. A large polarized target inside a superconducting solenoid is used for the measurements with the muon beam. Outgoing particles are detected by a two-stage, large angle and large momentum range spectrometer. The setup is built using several types of tracking detectors, according to the expected incident rate, required space resolution and the solid angle to be covered. Particle identification is achieved using a RICH counter and both hadron and electromagnetic calorimeters. The setup has been successfully operated from 2002 onwards using a muon beam. Data with a hadron beam were also collected in 2004. This article describes the main features and performances of the spectrometer in 2004; a short summary of the 2006 upgrade is also given., 84 papes, 74 figures

Published
2007

50. Search for single production of scalar leptoquarks in pp¯ collisions decaying into muons and quarks with the D0 detector

Author

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, T. Adams, E. Aguilo, S.H. Ahn, M. Ahsan, G.D. Alexeev, G. Alkhazov, A. Alton, G. Alverson, G.A. Alves, M. Anastasoaie, L.S. Ancu, T. Andeen, S. Anderson, B. Andrieu, M.S. Anzelc, Y. Arnoud, M. Arov, A. Askew, B. Åsman, A.C.S. Assis Jesus, O. Atramentov, C. Autermann, C. Avila, C. Ay, F. Badaud, A. Baden, L. Bagby, B. Baldin, D.V. Bandurin, P. Banerjee, S. Banerjee, E. Barberis, P. Bargassa, P. Baringer, C. Barnes, J. Barreto, J.F. Bartlett, U. Bassler, D. Bauer, S. Beale, A. Bean, M. Begalli, M. Begel, C. Belanger-Champagne, L. Bellantoni, A. Bellavance, J.A. Benitez, S.B. Beri, G. Bernardi, R. Bernhard, L. Berntzon, I. Bertram, M. Besançon, R. Beuselinck, V.A. Bezzubov, P.C. Bhat, V. Bhatnagar, M. Binder, C. Biscarat, I. Blackler, G. Blazey, F. Blekman, S. Blessing, D. Bloch, K. Bloom, A. Boehnlein, D. Boline, T.A. Bolton, G. Borissov, K. Bos, T. Bose, A. Brandt, R. Brock, G. Brooijmans, A. Bross, D. Brown, N.J. Buchanan, D. Buchholz, M. Buehler, V. Buescher, S. Burdin, S. Burke, T.H. Burnett, E. Busato, C.P. Buszello, J.M. Butler, P. Calfayan, S. Calvet, J. Cammin, S. Caron, W. Carvalho, B.C.K. Casey, N.M. Cason, H. Castilla-Valdez, S. Chakrabarti, D. Chakraborty, K.M. Chan, A. Chandra, F. Charles, E. Cheu, F. Chevallier, D.K. Cho, S. Choi, B. Choudhary, T. Christiansen, L. Christofek, D. Claes, B. Clément, C. Clément, Y. Coadou, M. Cooke, W.E. Cooper, M. Corcoran, F. Couderc, M.-C. Cousinou, B. Cox, S. Crépé-Renaudin, D. Cutts, M. Ćwiok, H. da Motta, A. Das, M. Das, B. Davies, G. Davies, K. De, P. de Jong, S.J. de Jong, E. De La Cruz-Burelo, C. De Oliveira Martins, J.D. Degenhardt, F. Déliot, M. Demarteau, R. Demina, D. Denisov, S.P. Denisov, S. Desai, H.T. Diehl, M. Diesburg, M. Doidge, A. Dominguez, H. Dong, L.V. Dudko, L. Duflot, S.R. Dugad, D. Duggan, A. Duperrin, J. Dyer, A. Dyshkant, M. Eads, D. Edmunds, J. Ellison, V.D. Elvira, Y. Enari, S. Eno, P. Ermolov, H. Evans, A. Evdokimov, V.N. Evdokimov, L. Feligioni, A.V. Ferapontov, T. Ferbel, F. Fiedler, F. Filthaut, W. Fisher, H.E. Fisk, M. Ford, M. Fortner, H. Fox, S. Fu, S. Fuess, T. Gadfort, C.F. Galea, E. Gallas, E. Galyaev, C. Garcia, A. Garcia-Bellido, V. Gavrilov, A. Gay, P. Gay, W. Geist, D. Gelé, R. Gelhaus, C.E. Gerber, Y. Gershtein, D. Gillberg, G. Ginther, N. Gollub, B. Gómez, A. Goussiou, P.D. Grannis, H. Greenlee, Z.D. Greenwood, E.M. Gregores, G. Grenier, Ph. Gris, J.-F. Grivaz, A. Grohsjean, S. Grünendahl, M.W. Grünewald, F. Guo, J. Guo, G. Gutierrez, P. Gutierrez, A. Haas, N.J. Hadley, P. Haefner, S. Hagopian, J. Haley, I. Hall, R.E. Hall, L. Han, K. Hanagaki, P. Hansson, K. Harder, A. Harel, R. Harrington, J.M. Hauptman, R. Hauser, J. Hays, T. Hebbeker, D. Hedin, J.G. Hegeman, J.M. Heinmiller, A.P. Heinson, U. Heintz, C. Hensel, K. Herner, G. Hesketh, M.D. Hildreth, R. Hirosky, J.D. Hobbs, B. Hoeneisen, H. Hoeth, M. Hohlfeld, S.J. Hong, R. Hooper, P. Houben, Y. Hu, Z. Hubacek, V. Hynek, I. Iashvili, R. Illingworth, A.S. Ito, S. Jabeen, M. Jaffré, S. Jain, K. Jakobs, C. Jarvis, A. Jenkins, R. Jesik, K. Johns, C. Johnson, M. Johnson, A. Jonckheere, P. Jonsson, A. Juste, D. Käfer, S. Kahn, E. Kajfasz, A.M. Kalinin, J.M. Kalk, J.R. Kalk, S. Kappler, D. Karmanov, J. Kasper, P. Kasper, I. Katsanos, D. Kau, R. Kaur, R. Kehoe, S. Kermiche, N. Khalatyan, A. Khanov, A. Kharchilava, Y.M. Kharzheev, D. Khatidze, H. Kim, T.J. Kim, M.H. Kirby, B. Klima, J.M. Kohli, J.-P. Konrath, M. Kopal, V.M. Korablev, J. Kotcher, B. Kothari, A. Koubarovsky, A.V. Kozelov, D. Krop, A. Kryemadhi, T. Kuhl, A. Kumar, S. Kunori, A. Kupco, T. Kurča, J. Kvita, D. Lam, S. Lammers, G. Landsberg, J. Lazoflores, A.-C. Le Bihan, P. Lebrun, W.M. Lee, A. Leflat, F. Lehner, V. Lesne, J. Leveque, P. Lewis, J. Li, L. Li, Q.Z. Li, S.M. Lietti, J.G.R. Lima, D. Lincoln, J. Linnemann, V.V. Lipaev, R. Lipton, Z. Liu, L. Lobo, A. Lobodenko, M. Lokajicek, A. Lounis, P. Love, H.J. Lubatti, M. Lynker, A.L. Lyon, A.K.A. Maciel, R.J. Madaras, P. Mättig, C. Magass, A. Magerkurth, N. Makovec, P.K. Mal, H.B. Malbouisson, S. Malik, V.L. Malyshev, H.S. Mao, Y. Maravin, R. McCarthy, A. Melnitchouk, A. Mendes, L. Mendoza, P.G. Mercadante, M. Merkin, K.W. Merritt, A. Meyer, J. Meyer, M. Michaut, H. Miettinen, T. Millet, J. Mitrevski, J. Molina, R.K. Mommsen, N.K. Mondal, J. Monk, R.W. Moore, T. Moulik, G.S. Muanza, M. Mulders, M. Mulhearn, O. Mundal, L. Mundim, E. Nagy, M. Naimuddin, M. Narain, N.A. Naumann, H.A. Neal, J.P. Negret, P. Neustroev, C. Noeding, A. Nomerotski, S.F. Novaes, T. Nunnemann, V. O'Dell, D.C. O'Neil, G. Obrant, C. Ochando, V. Oguri, N. Oliveira, D. Onoprienko, N. Oshima, J. Osta, R. Otec, G.J. Otero y Garzón, M. Owen, P. Padley, M. Pangilinan, N. Parashar, S.-J. Park, S.K. Park, J. Parsons, R. Partridge, N. Parua, A. Patwa, G. Pawloski, P.M. Perea, K. Peters, Y. Peters, P. Pétroff, M. Petteni, R. Piegaia, J. Piper, M.-A. Pleier, P.L.M. Podesta-Lerma, V.M. Podstavkov, Y. Pogorelov, M.-E. Pol, A. Pompoš, B.G. Pope, A.V. Popov, C. Potter, W.L. Prado da Silva, H.B. Prosper, S. Protopopescu, J. Qian, A. Quadt, B. Quinn, M.S. Rangel, K.J. Rani, K. Ranjan, P.N. Ratoff, P. Renkel, S. Reucroft, M. Rijssenbeek, I. Ripp-Baudot, F. Rizatdinova, S. Robinson, R.F. Rodrigues, C. Royon, P. Rubinov, R. Ruchti, G. Sajot, A. Sánchez-Hernández, M.P. Sanders, A. Santoro, G. Savage, L. Sawyer, T. Scanlon, D. Schaile, R.D. Schamberger, Y. Scheglov, H. Schellman, P. Schieferdecker, C. Schmitt, C. Schwanenberger, A. Schwartzman, R. Schwienhorst, J. Sekaric, S. Sengupta, H. Severini, E. Shabalina, M. Shamim, V. Shary, A.A. Shchukin, R.K. Shivpuri, D. Shpakov, V. Siccardi, R.A. Sidwell, V. Simak, V. Sirotenko, P. Skubic, P. Slattery, R.P. Smith, G.R. Snow, J. Snow, S. Snyder, S. Söldner-Rembold, X. Song, L. Sonnenschein, A. Sopczak, M. Sosebee, K. Soustruznik, M. Souza, B. Spurlock, J. Stark, J. Steele, V. Stolin, A. Stone, D.A. Stoyanova, J. Strandberg, S. Strandberg, M.A. Strang, M. Strauss, R. Ströhmer, D. Strom, M. Strovink, L. Stutte, S. Sumowidagdo, P. Svoisky, A. Sznajder, M. Talby, P. Tamburello, W. Taylor, P. Telford, J. Temple, B. Tiller, M. Titov, V.V. Tokmenin, M. Tomoto, T. Toole, I. Torchiani, T. Trefzger, S. Trincaz-Duvoid, D. Tsybychev, B. Tuchming, C. Tully, P.M. Tuts, R. Unalan, L. Uvarov, S. Uvarov, S. Uzunyan, B. Vachon, P.J. van den Berg, B. van Eijk, R. Van Kooten, W.M. van Leeuwen, N. Varelas, E.W. Varnes, A. Vartapetian, I.A. Vasilyev, M. Vaupel, P. Verdier, L.S. Vertogradov, M. Verzocchi, F. Villeneuve-Seguier, P. Vint, J.-R. Vlimant, E. Von Toerne, M. Voutilainen, M. Vreeswijk, H.D. Wahl, L. Wang, M.H.L.S. Wang, J. Warchol, G. Watts, M. Wayne, G. Weber, M. Weber, H. Weerts, N. Wermes, M. Wetstein, A. White, D. Wicke, G.W. Wilson, S.J. Wimpenny, M. Wobisch, J. Womersley, D.R. Wood, T.R. Wyatt, Y. Xie, S. Yacoob, R. Yamada, M. Yan, T. Yasuda, Y.A. Yatsunenko, K. Yip, H.D. Yoo, S.W. Youn, C. Yu, J. Yu, A. Yurkewicz, A. Zatserklyaniy, C. Zeitnitz, D. Zhang, T. Zhao, B. Zhou, J. Zhu, M. Zielinski, D. Zieminska, A. Zieminski, V. Zutshi, and E.G. Zverev

Subjects
Physics, Quark, Nuclear and High Energy Physics, Particle physics, Muon, 010308 nuclear & particles physics, Branching fraction, High Energy Physics::Phenomenology, Scalar (mathematics), Lambda, 01 natural sciences, Upper and lower bounds, Nuclear physics, Pair production, 0103 physical sciences, High Energy Physics::Experiment, Leptoquark, 010306 general physics
Abstract

We report on a search for second generation leptoquarks LQ_2 which decay into a muon plus quark in p\bar{p} collisions at a center-of-mass energy of sqrt{s} = 1.96 TeV in the D0 detector using an integrated luminosity of about 300 pb-1. No evidence for a leptoquark signal is observed and an upper bound on the product of the cross section for single leptoquark production times branching fraction beta into a quark and a muon was determined for second generation scalar leptoquarks as a function of the leptoquark mass. This result has been combined with a previously published D0 search for leptoquark pair production to obtain leptoquark mass limits as a function of the leptoquark-muon-quark coupling, lambda. Assuming lambda=1, lower limits on the mass of a second generation scalar leptoquark are m{LQ_2}>274 GeV and m{LQ_2}>226 GeV for beta=1 and beta=1/2, respectively.

Published
2007

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