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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. Spin density matrix elements in exclusive $$\omega $$ ω meson muoproduction

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, 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, A. Ferrero, M. Finger, 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, P. Jörg, R. Joosten, 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, M. Pešek, D. V. Peshekhonov, M. Pešková, N. Pierre, S. Platchkov, J. Pochodzalla, V. A. Polyakov, J. Pretz, M. Quaresma, C. Quintans, C. Regali, 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, T. Szameitat, 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, M. Ziembicki, and COMPASS Collaboration

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $$\omega $$ ω meson muoproduction on the proton at COMPASS using 160 GeV/c polarised $$ \mu ^{+}$$ μ + and $$ \mu ^{-}$$ μ - beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/ $$c^2$$ c 2 $$< W

Published
2021
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5. 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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6. ^{22}Na activation level measurements of fused silica rods in the LHC target absorber for neutrals compared to simulations

Author

S. Yang, M. Sabate Gilarte, A. Tate, N. Santiago, R. Longo, S. Mazzoni, F. Cerutti, E. Bravin, M. Grosse Perdekamp, G. Lerner, D. Prelipcean, Z. Citron, B. Cole, S. Jackobsen, M. D. Kaminski, T. Koeth, C. Lantz, D. MacLean, A. Mignerey, M. Murray, M. Palm, M. Phipps, P. Steinberg, and A. Tsinganis

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

The Target Absorbers for Neutrals (TANs) are located in a high intensity radiation environment inside the tunnel of the Large Hadron Collider (LHC). TANs are positioned about 140 m downstream from the beam interaction points. Seven 40-cm long fused silica rods with different dopant specifications were irradiated in the TAN by the Beam RAte of Neutrals (BRAN) detector group during p+p data taking from 2016 to 2018 at the LHC. The peak dose delivered to the fused silica rods was 18 MGy. We report measurements of the ^{22}Na activation of the fused silica rods carried out at the University of Illinois at Urbana-Champaign and Argonne National Laboratory. At the end of the irradiation campaign, the maximum ^{22}Na activity observed was A=21 kBq/cm^{3} corresponding to a density, ρ=2.5×10^{12}/cm^{3}, of ^{22}Na nuclei. fluka Monte Carlo simulations have been performed by the CERN fluka team to estimate ^{22}Na activities for the irradiated BRAN rod samples. The simulations reproduce the ^{22}Na activity profile measured along the rods, with a 35% underestimation of the experimental measurement results.

Published
2022
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7. Erratum to: Azimuthal asymmetries of charged hadrons produced in high-energy muon scattering off longitudinally polarised deuterons

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, 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
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

The original version of this article unfortunately contained a mistake.

Published
2020
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8. 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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9. 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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10. 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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11. 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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12. 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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13. 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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14. Azimuthal asymmetries of charged hadrons produced in high-energy muon scattering off longitudinally polarised deuterons

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 Vijayan 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
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Single hadron azimuthal asymmetries of positive and negative hadrons produced in muon semi-inclusive deep inelastic scattering off longitudinally polarised deuterons are determined using the 2006 COMPASS data and also combined all deuteron COMPASS data. For each hadron charge, the dependence of the azimuthal asymmetry on the hadron azimuthal angle $$\phi $$ ϕ is obtained by means of a five-parameter fitting function that besides a $$\phi $$ ϕ -independent term includes four modulations predicted by theory: $$\sin \phi $$ sinϕ , $$\sin 2 \phi $$ sin2ϕ , $$\sin 3\phi $$ sin3ϕ and $$\cos \phi $$ cosϕ . The amplitudes of the five terms have been extracted, first, for the hadrons in the whole available kinematic region. In further fits, performed for hadrons from a restricted kinematic region, the $$\phi $$ ϕ -dependence is determined as a function of one of three variables (Bjorken-x, fractional energy of virtual photon taken by the outgoing hadron and hadron transverse momentum), while disregarding the others. Except the $$\phi $$ ϕ -independent term, all the modulation amplitudes are very small, and no clear kinematic dependence could be observed within experimental uncertainties.

Published
2018
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15. 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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16. 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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17. 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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18. 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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19. 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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20. 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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21. Leading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering data

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, 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, 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, W. Meyer, T. Michigami, Yu. V. Mikhailov, M. Mikhasenko, 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, 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, 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, J. ter Wolbeek, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, A. Zink, and COMPASS Collaboration

Subjects
Transverse Momentum, Monte Carlo, Systematic Uncertainty, Parton Shower, Monte Carlo Model, Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Using a novel analysis technique, the gluon polarisation in the nucleon is re-evaluated using the longitudinal double-spin asymmetry measured in the cross section of semi-inclusive single-hadron muoproduction with photon virtuality $$Q^2>1~(\mathrm{GeV}/c)^2$$ Q 2 > 1 ( GeV / c ) 2 . The data were obtained by the COMPASS experiment at CERN using a 160 GeV/c polarised muon beam impinging on a polarised $$^6$$ 6 LiD target. By analysing the full range in hadron transverse momentum $$p_\mathrm{T}$$ p T , the different $$p_\mathrm{T}$$ p T -dependences of the underlying processes are separated using a neural-network approach. In the absence of pQCD calculations at next-to-leading order in the selected kinematic domain, the gluon polarisation $$\Delta g/g$$ Δ g / g is evaluated at leading order in pQCD at a hard scale of $$\mu ^2= \langle Q^2 \rangle = 3 (\mathrm{GeV}/c)^2$$ μ 2 = ⟨ Q 2 ⟩ = 3 ( GeV / c ) 2 . It is determined in three intervals of the nucleon momentum fraction carried by gluons, $$x_\mathrm{g}$$ x g , covering the range $$0.04 \!

Published
2017
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22. 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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23. 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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24. 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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25. 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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26. 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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27. Na22 activation level measurements of fused silica rods in the LHC target absorber for neutrals compared to simulations

Author

S. Yang, M. Sabate Gilarte, A. Tate, N. Santiago, R. Longo, S. Mazzoni, F. Cerutti, E. Bravin, M. Grosse Perdekamp, G. Lerner, D. Prelipcean, Z. Citron, B. Cole, S. Jackobsen, M. D. Kaminski, T. Koeth, C. Lantz, D. MacLean, A. Mignerey, M. Murray, M. Palm, M. Phipps, P. Steinberg, and A. Tsinganis

Subjects
Nuclear and High Energy Physics, Physics and Astronomy (miscellaneous), Surfaces and Interfaces
Published
2022

28. Differing sizes of bullet entrance holes in skin of the anterior and posterior trunk

Author

D. Geisenberger, M. Große Perdekamp, S. Pollak, A. Thierauf-Emberger, and V. Thoma

Subjects
Firearms, Forensic Ballistics, Swine, Animals, Wounds, Gunshot, Pathology and Forensic Medicine, Skin
Abstract

The aim of the present study was to establish whether the size (diameter and area) of bullet entrance holes in skin varies between distant shots to the anterior and posterior trunk, respectively, when using the same ammunition (in concreto pistol cartridges 9 mm Luger). For that purpose, specimens of porcine skin from the belly region and the back were taken (10 samples each) and shot at from a distance of 1.6 m. The entrance holes were photo-documented under standardised conditions. After image processing for contrast enhancement, the maximum diameter and the area of each skin defect were measured automatically by means of an image analysis system. Both size parameters differed significantly depending on the body region affected. On the back with its comparatively thick dermis, the skin defects were considerably smaller than those on the ventral trunk where the corium is less thick. This difference can be explained by the fact that the elastic properties of skin are strongly determined by the connective tissue which is especially rich in fibres. The study results were consistent with the authors’ casework experience and support the assumption that the entrance site of gunshot wounds has a major influence on the size of the bullet hole in skin.

Published
2022

29. Exotic meson π1(1600) with JPC=1−+ and its decay into ρ(770)π

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, D. Eremeev, P. D. Eversheim, P. Faccioli, M. Faessler, M. Finger, H. Fischer, K. Floethner, C. Franco, J. M. Friedrich, V. Frolov, L. Garcia Ordonez, 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, F. Haas, 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, F. Kaspar, A. Kerbizi, B. Ketzer, G. V. Khaustov, Yu. A. Khokhlov, Yu. Kisselev, F. Klein, J. H. Koivuniemi, V. N. Kolosov, I. Konorov, V. F. Konstantinov, 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, B. Marianski, A. Martin, J. Marzec, J. Matoušek, T. Matsuda, G. Mattson, F. Metzger, M. Meyer, W. Meyer, Yu. V. Mikhailov, M. Mikhasenko, E. Mitrofanov, Y. Miyachi, 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, 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, S. Schmeing, H. Schmieden, A. Selyunin, K. Sharko, L. Sinha, M. Slunecka, D. Spülbeck, A. Srnka, D. Steffen, M. Stolarski, O. Subrt, M. Sulc, H. Suzuki, S. Tessaro, F. Tessarotto, A. Thiel, J. Tomsa, F. Tosello, A. Townsend, T. Triloki, V. Tskhay, S. Uhl, B. Valinoti, A. Vauth, B. M. Veit, J. Veloso, B. Ventura, A. Vidon, M. Virius, M. Wagner, S. Wallner, K. Zaremba, M. Zavertyaev, M. Zemko, E. Zemlyanichkina, Y. Zhao, and M. Ziembicki

Subjects
010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences
Published
2022

30. Probing Gluon Spin-Momentum Correlations in Transversely Polarized Protons through Midrapidity Isolated Direct Photons in p↑+p Collisions at s=200 GeV

Author

S. F. Pate, Y. L. Yamaguchi, C. Xu, D. Ivanishchev, V. Papavassiliou, Hari Guragain, C. E. Perezlara, H. Asano, A. Sexton, T. Murakami, P. Montuenga, Y. Riabov, R. Seto, N. Grau, T. W. Danley, Takafumi Niida, J. Huang, A. Franz, J. Runchey, A. Sen, Prakhar Garg, K. A. Drees, N. Feege, Kenta Shigaki, R. Cervantes, Iu. Mitrankov, L. Zou, J. Bryslawskyj, J. E. Frantz, D. Reynolds, M. Rosati, B. Mulilo, Sándor Lökös, Tamás Csörgő, K. N. Barish, A. S. Nyanin, J. Klatsky, S. Zharko, N. Cronin, A. Deshpande, Dillon Scott Fitzgerald, Kei Nagashima, M. Snowball, D. McGlinchey, R. A. Soltz, N. Ramasubramanian, H. En'yo, Alexei Khanzadeev, M. J. Leitch, V. Canoa Roman, John Hill, M. Tomášek, D. E. Fields, X. Jiang, Rachid Nouicer, Xiong Wang, A. N. Zelenski, S. P. Sorensen, B. Kurgyis, B. V. Jacak, Minghui Liu, Brajesh K. Singh, G. J. Ottino, Toru Sugitate, W. Peng, P. W. Stankus, Kensuke Homma, I. J. Choi, M. L. Brooks, L. Bichon, C. L. Woody, M. Alfred, M. Grosse Perdekamp, Kenneth Francis Read, Y. J. Kwon, J. B. Choi, X. He, A. Berdnikov, Y. H. Leung, Raphael Noel Tieulent, A. V. Kazantsev, F. Giordano, Satoshi Sato, S. Kudo, R. Corliss, N. S. Bandara, Vladimir Samsonov, Christine Nattrass, T. Hachiya, S. K. Park, M. I. Nagy, Dipak Kumar Mishra, Kenichi Imai, Petr Gallus, T. O. S. Haseler, D. A. Loomis, D. Kapukchyan, Jong-Min Park, Taku Gunji, G. D. N. Perera, Qiao Xu, David Olle Rickard Silvermyr, Y. Goto, M. Phipps, Motoi Inaba, T. Nagashima, Y. Fukuda, I. V. Sourikova, Hideki Hamagaki, W. Fan, G. David, T. Todoroki, E. J. Mannel, K. I. Hahn, J. G. Lajoie, S. Lee, Jennifer E. Perry, Xiao-yan Li, Alexander Milov, J. Hanks, Hiroyuki Sako, M. Patel, N. Apadula, A. Durum, A. Iordanova, Keiji Nagai, A. Drees, S. H. Lim, S. Y. Han, Z. Ji, D. Yu Peressounko, A. Yanovich, I. Nakagawa, Z. Rowan, Dennis Perepelitsa, M. Mendoza, S. Karthas, J. L. Nagle, C. Pinkenburg, D. Kotov, D. S. Jumper, Kyoichiro Ozawa, D. P. Morrison, A. Sukhanov, K. Kurita, S. Campbell, M. Csanad, S. P. Stoll, G. Nukazuka, Min-Hye Kim, G. Tarnai, H. Ge, K. Nakano, Z. Sun, W. E. Sondheim, Arkadiy Taranenko, S. H. Lee, I. Tserruya, M. Jezghani, D. Larionova, T. Majoros, D. Sharma, V. Singh, A. Hodges, T. Shioya, R. Esha, S. D. Rolnick, M. Slunečka, P. L. McGaughey, S. Tarafdar, V. Babintsev, N. Novitzky, R. P. Pisani, T. Koblesky, T. Moon, Senta Greene, Viktor Riabov, Serpil Yalcin, M. Sarsour, D. Jouan, Y. Corrales Morales, V. Bumazhnov, S. Nelson, Byung-Sik Hong, B. Fadem, E. O'Brien, K. L. Smith, M. Harvey, U. Acharya, M. McCumber, Anne Marie Sickles, J. Murata, Chong Kim, A. Bazilevsky, S. Bathe, M. Chiu, Dmitry Blau, B. Schaefer, C. P. Wong, P. V. Radzevich, M. Connors, T. A. Shibata, W. A. Zajc, L. Xue, Alexandre Lebedev, C. A. Ogilvie, T. K. Hemmick, E. J. Desmond, Eunja Kim, A. Denisov, J. S. Bok, G. Mitsuka, A. Pun, J. H. Kang, J. S. Haggerty, Sergey Fokin, K. DeBlasio, D. Isenhower, Tamas Novak, Balazs Ujvari, M. Giles, M. Mitrankova, I. E. Yushmanov, C. Gal, Klaus Dehmelt, Julia Velkovska, A. Khatiwada, D. Dixit, S. Mizuno, M. Beaumier, H. W. Van Hecke, B. Blankenship, Agneta Oskarsson, D. Kincses, John Matthew Durham, Y. Berdnikov, Y. Akiba, C. McKinney, Vaclav Vrba, K. Hill, Maya Hachiya Shimomura, R. S. Hollis, Y. I. Makdisi, M. M. Mondal, M. J. Tannenbaum, B. K. Schmoll, S. Esumi, Martin Purschke, C. A. Aidala, Alice Mignerey, S. Miyasaka, Shoichi Hasegawa, Takao Sakaguchi, A. D. Frawley, V. Andrieux, S. Huang, V. Khachatryan, A. Kingan, H. F. Hamilton, D. Kawall, B. Azmoun, K. Tanida, E. Kistenev, J. H. Yoo, R. Belmont, Zvi Hirsh Citron, P. Kline, A. Dion, I. Shein, J. Sun, V. R. Loggins, J. T. Mitchell, K. Sedgwick, N. Hotvedt, R. Seidl, Vladislav Manko, Mihael Makek, H. Yamamoto, C. L. Silva, A. Enokizono, Y. Watanabe, V. Pantuev, R. S. Towell, A. Timilsina, K. Lovasz, D. Lynch, M. Potekhin, T. Hoshino, D. Richford, A. S. Safonov, Yoshifumi Ueda, J. H. Do, C. L. Towell, N. Vukman, Timothy Thomas Rinn, H. Yu, T. Sumita, C. Y. Chi, M. S. Daugherity, C. P. Singh, J. D. Osborn, Inseok Yoon, R. Petti, B. M. Johnson, N. A. Lewis, M. Finger, J. Sziklai, M. Virius, J. D. Orjuela Koop, and Prashant Shukla

Subjects
Physics, Photon, Proton, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Strong interaction, General Physics and Astronomy, 7. Clean energy, 01 natural sciences, Gluon, Nuclear physics, Momentum, 0103 physical sciences, High Energy Physics::Experiment, PHENIX detector, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

Studying spin-momentum correlations in hadronic collisions offers a glimpse into a three-dimensional picture of proton structure. The transverse single-spin asymmetry for midrapidity isolated direct photons in p ↑ + p collisions at s = 200 GeV is measured with the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC). Because direct photons in particular are produced from the hard scattering and do not interact via the strong force, this measurement is a clean probe of initial-state spin-momentum correlations inside the proton and is in particular sensitive to gluon interference effects within the proton. This is the first time direct photons have been used as a probe of spin-momentum correlations at RHIC. The uncertainties on the results are a 50-fold improvement with respect to those of the one prior measurement for the same observable, from the Fermilab E704 experiment. These results constrain gluon spin-momentum correlations in transversely polarized protons.

Published
2021

31. PHENIX Collaboration

Author

A. Adare, S. Afanasiev, C. Aidala, N.N. Ajitanand, Y. Akiba, R. Akimoto, H. Al-Bataineh, J. Alexander, M. Alfred, A. Al-Jamel, H. Al-Ta'ani, K.R. Andrews, V. Andrieux, A. Angerami, K. Aoki, N. Apadula, L. Aphecetche, E. Appelt, Y. Aramaki, R. Armendariz, S.H. Aronson, J. Asai, H. Asano, E.C. Aschenauer, E.T. Atomssa, R. Averbeck, T.C. Awes, C. Ayuso, B. Azmoun, V. Babintsev, A. Bagoly, M. Bai, X. Bai, G. Baksay, L. Baksay, A. Baldisseri, N.S. Bandara, B. Bannier, K.N. Barish, P.D. Barnes, B. Bassalleck, A.T. Basye, S. Bathe, S. Batsouli, V. Baublis, F. Bauer, C. Baumann, S. Baumgart, A. Bazilevsky, M. Beaumier, S. Beckman, S. Belikov, R. Belmont, J. Ben-Benjamin, R. Bennett, A. Berdnikov, Y. Berdnikov, J.H. Bhom, A.A. Bickley, M.T. Bjorndal, D. Black, D.S. Blau, M. Boer, J.G. Boissevain, J.S. Bok, H. Borel, K. Boyle, M.L. Brooks, D.S. Brown, D. Broxmeyer, J. Bryslawskyj, D. Bucher, H. Buesching, V. Bumazhnov, G. Bunce, J.M. Burward-Hoy, C. Butler, S. Butsyk, C.M. Camacho, S. Campbell, V. Canoa Roman, A. Caringi, P. Castera, R. Cervantes, J.-S. Chai, B.S. Chang, W.C. Chang, J.-L. Charvet, C.-H. Chen, S. Chernichenko, C.Y. Chi, J. Chiba, M. Chiu, I.J. Choi, J.B. Choi, S. Choi, R.K. Choudhury, P. Christiansen, T. Chujo, P. Chung, A. Churyn, O. Chvala, V. Cianciolo, Z. Citron, C.R. Cleven, Y. Cobigo, B.A. Cole, M.P. Comets, Z. Conesa del Valle, M. Connors, P. Constantin, N. Cronin, N. Crossette, M. Csanád, T. Csörgő, T. Dahms, S. Dairaku, I. Danchev, T.W. Danley, K. Das, A. Datta, M.S. Daugherity, G. David, M.K. Dayananda, M.B. Deaton, K. DeBlasio, K. Dehmelt, H. Delagrange, A. Denisov, D. d'Enterria, A. Deshpande, E.J. Desmond, K.V. Dharmawardane, O. Dietzsch, L. Ding, A. Dion, P.B. Diss, D. Dixit, J.H. Do, M. Donadelli, L. D'Orazio, J.L. Drachenberg, O. Drapier, A. Drees, K.A. Drees, A.K. Dubey, M. Dumancic, J.M. Durham, A. Durum, D. Dutta, V. Dzhordzhadze, S. Edwards, Y.V. Efremenko, J. Egdemir, T. Elder, F. Ellinghaus, W.S. Emam, T. Engelmore, A. Enokizono, H. En'yo, B. Espagnon, S. Esumi, K.O. Eyser, B. Fadem, W. Fan, N. Feege, D.E. Fields, M. Finger, F. Fleuret, S.L. Fokin, B. Forestier, Z. Fraenkel, J.E. Frantz, A. Franz, A.D. Frawley, K. Fujiwara, Y. Fukao, Y. Fukuda, S.-Y. Fung, T. Fusayasu, S. Gadrat, K. Gainey, C. Gal, P. Gallus, P. Garg, A. Garishvili, I. Garishvili, F. Gastineau, H. Ge, M. Germain, F. Giordano, A. Glenn, H. Gong, X. Gong, M. Gonin, J. Gosset, Y. Goto, R. Granier de Cassagnac, N. Grau, S.V. Greene, G. Grim, M. Grosse Perdekamp, Y. Gu, T. Gunji, L. Guo, H. Guragain, H.-Å. Gustafsson, T. Hachiya, A. Hadj Henni, C. Haegemann, J.S. Haggerty, M.N. Hagiwara, K.I. Hahn, H. Hamagaki, J. Hamblen, H.F. Hamilton, R. Han, S.Y. Han, J. Hanks, H. Harada, C. Harper, E.P. Hartouni, K. Haruna, M. Harvey, S. Hasegawa, T.O.S. Haseler, K. Hashimoto, E. Haslum, K. Hasuko, R. Hayano, S. Hayashi, X. He, M. Heffner, T.K. Hemmick, T. Hester, J.M. Heuser, H. Hiejima, J.C. Hill, K. Hill, R. Hobbs, M. Hohlmann, R.S. Hollis, M. Holmes, W. Holzmann, K. Homma, B. Hong, T. Horaguchi, Y. Hori, D. Hornback, T. Hoshino, N. Hotvedt, J. Huang, S. Huang, M.G. Hur, T. Ichihara, R. Ichimiya, J. Ide, H. Iinuma, Y. Ikeda, K. Imai, Y. Imazu, J. Imrek, M. Inaba, Y. Inoue, A. Iordanova, D. Isenhower, L. Isenhower, M. Ishihara, A. Isinhue, T. Isobe, M. Issah, A. Isupov, Y. Ito, D. Ivanishchev, Y. Iwanaga, B.V. Jacak, M. Javani, S.J. Jeon, M. Jezghani, Z. Ji, J. Jia, X. Jiang, J. Jin, O. Jinnouchi, D. John, B.M. Johnson, T. Jones, E. Joo, K.S. Joo, V. Jorjadze, D. Jouan, D.S. Jumper, F. Kajihara, S. Kametani, N. Kamihara, J. Kamin, S. Kanda, M. Kaneta, S. Kaneti, B.H. Kang, J.H. Kang, J.S. Kang, H. Kanou, D. Kapukchyan, J. Kapustinsky, K. Karatsu, S. Karthas, M. Kasai, T. Kawagishi, D. Kawall, M. Kawashima, A.V. Kazantsev, S. Kelly, T. Kempel, J.A. Key, V. Khachatryan, P.K. Khandai, A. Khanzadeev, K. Kihara, K.M. Kijima, J. Kikuchi, A. Kim, B.I. Kim, C. Kim, D.H. Kim, D.J. Kim, E. Kim, E.-J. Kim, G.W. Kim, H.-J. Kim, H.J. Kim, K.-B. Kim, M. Kim, M.H. Kim, S.H. Kim, Y.-J. Kim, Y.K. Kim, Y.-S. Kim, B. Kimelman, D. Kincses, E. Kinney, K. Kiriluk, Á. Kiss, E. Kistenev, R. Kitamura, A. Kiyomichi, J. Klatsky, J. Klay, C. Klein-Boesing, D. Kleinjan, P. Kline, T. Koblesky, L. Kochenda, V. Kochetkov, M. Kofarago, Y. Komatsu, B. Komkov, M. Konno, J. Koster, D. Kotchetkov, D. Kotov, A. Kozlov, A. Král, A. Kravitz, F. Krizek, P.J. Kroon, J. Kubart, S. Kudo, G.J. Kunde, N. Kurihara, K. Kurita, M. Kurosawa, M.J. Kweon, Y. Kwon, G.S. Kyle, R. Lacey, Y.S. Lai, J.G. Lajoie, E.O. Lallow, D. Layton, A. Lebedev, Y. Le Bornec, S. Leckey, B. Lee, D.M. Lee, G.H. Lee, J. Lee, K. Lee, K.B. Lee, K.S. Lee, M.K. Lee, S. Lee, S.H. Lee, S.R. Lee, T. Lee, M.J. Leitch, M.A.L. Leite, M. Leitgab, E. Leitner, B. Lenzi, Y.H. Leung, B. Lewis, N.A. Lewis, X. Li, X.H. Li, P. Lichtenwalner, P. Liebing, H. Lim, S.H. Lim, L.A. Linden Levy, T. Liška, A. Litvinenko, H. Liu, L.D. Liu, M.X. Liu, V.-R. Loggins, S. Lokos, K. Lovasz, B. Love, R. Luechtenborg, D. Lynch, C.F. Maguire, T. Majoros, Y.I. Makdisi, M. Makek, M. Malaev, A. Malakhov, M.D. Malik, A. Manion, V.I. Manko, E. Mannel, Y. Mao, L. Mašek, H. Masuda, H. Masui, S. Masumoto, F. Matathias, M.C. McCain, M. McCumber, P.L. McGaughey, D. McGlinchey, C. McKinney, N. Means, A. Meles, M. Mendoza, B. Meredith, W.J. Metzger, Y. Miake, T. Mibe, J. Midori, A.C. Mignerey, D.E. Mihalik, P. Mikeš, K. Miki, A.J. Miller, T.E. Miller, A. Milov, S. Mioduszewski, D.K. Mishra, G.C. Mishra, M. Mishra, J.T. Mitchell, M. Mitrovski, G. Mitsuka, Y. Miyachi, S. Miyasaka, S. Mizuno, A.K. Mohanty, S. Mohapatra, P. Montuenga, H.J. Moon, T. Moon, Y. Morino, A. Morreale, D.P. Morrison, S.I.M. Morrow, M. Moskowitz, J.M. Moss, S. Motschwiller, T.V. Moukhanova, D. Mukhopadhyay, T. Murakami, J. Murata, A. Mwai, T. Nagae, K. Nagai, S. Nagamiya, K. Nagashima, T. Nagashima, Y. Nagata, J.L. Nagle, M. Naglis, M.I. Nagy, I. Nakagawa, H. Nakagomi, Y. Nakamiya, K.R. Nakamura, T. Nakamura, K. Nakano, S. Nam, C. Nattrass, A. Nederlof, P.K. Netrakanti, J. Newby, M. Nguyen, M. Nihashi, T. Niida, S. Nishimura, B.E. Norman, R. Nouicer, T. Novák, N. Novitzky, R. Novotny, A. Nukariya, A.S. Nyanin, J. Nystrand, C. Oakley, H. Obayashi, E. O'Brien, S.X. Oda, C.A. Ogilvie, H. Ohnishi, H. Oide, I.D. Ojha, M. Oka, K. Okada, O.O. Omiwade, Y. Onuki, J.D. Orjuela Koop, J.D. Osborn, A. Oskarsson, I. Otterlund, G.J. Ottino, M. Ouchida, K. Ozawa, R. Pak, D. Pal, A.P.T. Palounek, V. Pantuev, V. Papavassiliou, B.H. Park, I.H. Park, J. Park, J.S. Park, S. Park, S.K. Park, W.J. Park, S.F. Pate, L. Patel, M. Patel, H. Pei, J.-C. Peng, W. Peng, H. Pereira, D.V. Perepelitsa, G.D.N. Perera, V. Peresedov, D.Yu. Peressounko, C.E. PerezLara, J. Perry, R. Petti, M. Phipps, C. Pinkenburg, R. Pinson, R.P. Pisani, M. Proissl, A. Pun, M.L. Purschke, A.K. Purwar, H. Qu, P.V. Radzevich, J. Rak, A. Rakotozafindrabe, B.J. Ramson, I. Ravinovich, K.F. Read, S. Rembeczki, M. Reuter, K. Reygers, D. Reynolds, V. Riabov, Y. Riabov, E. Richardson, D. Richford, T. Rinn, N. Riveli, D. Roach, G. Roche, S.D. Rolnick, A. Romana, M. Rosati, C.A. Rosen, S.S.E. Rosendahl, P. Rosnet, Z. Rowan, J.G. Rubin, P. Rukoyatkin, J. Runchey, P. Ružička, V.L. Rykov, M.S. Ryu, S.S. Ryu, A.S. Safonov, B. Sahlmueller, N. Saito, T. Sakaguchi, S. Sakai, K. Sakashita, H. Sakata, H. Sako, V. Samsonov, M. Sano, S. Sano, M. Sarsour, H.D. Sato, K. Sato, S. Sato, T. Sato, M. Savastio, S. Sawada, B. Schaefer, B.K. Schmoll, K. Sedgwick, J. Seele, R. Seidl, Y. Sekiguchi, A.Yu. Semenov, V. Semenov, A. Sen, R. Seto, P. Sett, A. Sexton, D. Sharma, A. Shaver, T.K. Shea, I. Shein, A. Shevel, T.-A. Shibata, K. Shigaki, H.H. Shim, M. Shimomura, T. Shioya, T. Shohjoh, K. Shoji, P. Shukla, A. Sickles, C.L. Silva, D. Silvermyr, C. Silvestre, K.S. Sim, B.K. Singh, C.P. Singh, V. Singh, M.J. Skoby, M. Skolnik, S. Skutnik, M. Slunečka, K.L. Smith, W.C. Smith, M. Snowball, T. Sodre, S. Solano, A. Soldatov, R.A. Soltz, W.E. Sondheim, S.P. Sorensen, I.V. Sourikova, N.A. Sparks, F. Staley, P.W. Stankus, P. Steinberg, E. Stenlund, M. Stepanov, A. Ster, S.P. Stoll, M.R. Stone, T. Sugitate, C. Suire, A. Sukhanov, J.P. Sullivan, T. Sumita, J. Sun, S. Syed, J. Sziklai, T. Tabaru, S. Takagi, E.M. Takagui, A. Takahara, A. Takeda, A. Taketani, R. Tanabe, K.H. Tanaka, Y. Tanaka, S. Taneja, K. Tanida, M.J. Tannenbaum, S. Tarafdar, A. Taranenko, P. Tarján, G. Tarnai, E. Tennant, H. Themann, D. Thomas, T.L. Thomas, R. Tieulent, A. Timilsina, T. Todoroki, M. Togawa, A. Toia, J. Tojo, L. Tomášek, M. Tomášek, Y. Tomita, H. Torii, C.L. Towell, M. Towell, R. Towell, R.S. Towell, V.-N. Tram, I. Tserruya, Y. Tsuchimoto, T. Tsuji, S.K. Tuli, H. Tydesjö, N. Tyurin, Y. Ueda, B. Ujvari, K. Utsunomiya, C. Vale, H. Valle, H.W. van Hecke, M. Vargyas, S. Vazquez-Carson, E. Vazquez-Zambrano, A. Veicht, J. Velkovska, R. Vértesi, A.A. Vinogradov, M. Virius, B. Voas, A. Vossen, V. Vrba, N. Vukman, E. Vznuzdaev, M. Wagner, D. Walker, X.R. Wang, Z. Wang, D. Watanabe, K. Watanabe, Y. Watanabe, Y.S. Watanabe, F. Wei, R. Wei, J. Wessels, S. Whitaker, A.S. White, S.N. White, N. Willis, D. Winter, S. Wolin, C.P. Wong, J.P. Wood, C.L. Woody, R.M. Wright, M. Wysocki, B. Xia, W. Xie, C. Xu, Q. Xu, L. Xue, S. Yalcin, Y.L. Yamaguchi, H. Yamamoto, K. Yamaura, R. Yang, A. Yanovich, Z. Yasin, P. Yin, J. Ying, S. Yokkaichi, J.H. Yoo, J.S. Yoo, I. Yoon, Z. You, G.R. Young, I. Younus, H. Yu, I.E. Yushmanov, W.A. Zajc, O. Zaudtke, A. Zelenski, C. Zhang, S. Zharko, S. Zhou, J. Zimamyi, L. Zolin, and L. Zou

Subjects
Nuclear and High Energy Physics
Published
2019

32. Creation of quark–gluon plasma droplets with three distinct geometries

Author

J. E. Frantz, D. Richford, N. S. Bandara, D. Lynch, T. K. Hemmick, Vladimir Samsonov, H. Hamagaki, Dmitry Blau, B. Schaefer, T. Hachiya, C. P. Singh, T. Todoroki, A. Bazilevsky, Gregory James Ottino, D. S. Jumper, J. S. Bok, K. Lovasz, A. Franz, M. X. Liu, E. J. Desmond, D. Ivanishchev, J. Perry, V. Papavassiliou, J. L. Nagle, C. E. Perezlara, J. Hanks, K. Nagai, D. Isenhower, Dhruv Utpalkumar Dixit, S. Hasegawa, N. A. Lewis, N. Grau, V. R. Loggins, J. C. Hill, Z. Citron, T. Gunji, E. O. Lallow, B. V. Jacak, A. Taranenko, G. D. N. Perera, D. McGlinchey, A. Durum, W. Peng, J. Bryslawskyj, M. E. Connors, Byungsik Hong, P. Kline, A. Dion, V. S. Pantuev, Hari Guragain, K. DeBlasio, Min-Hye Kim, V. Bumazhnov, Y. L. Yamaguchi, N. Hotvedt, V. Vrba, Y. Akiba, S. Vazquez-Carson, K. Kurita, R. Nouicer, P. W. Stankus, Kimberly Hill, A. Enokizono, K. Imai, David Olle Rickard Silvermyr, K. Tanida, Mikhail Malaev, Daugherity, M. Beaumier, Vladislav Manko, J. D. Osborn, A. Bagoly, A. Sickles, R. S. Towell, T. O. S. Haseler, S. P. Stoll, Alexei Safonov, Tamás Csörgő, A. Pun, K. A. Drees, C. P. Wong, L. D. Liu, T. Sakaguchi, W.A. Zajc, Mate Csanad, A. Iordanova, D. Jouan, Y. Berdnikov, S. Y. Han, B. M. Johnson, T. Majoros, M. J. Leitch, Zirui Wang, Z. Ji, H. En'yo, S. H. Lim, W. Fan, K. Aoki, J. Huang, Alexander Milov, I. Nakagawa, L. Xue, C.Y. Chi, A.V. Kazantsev, N. Apadula, K. I. Hahn, J. Murata, D. V. Perepelitsa, Yuki Watanabe, P. Yin, C. Xu, E. Mannel, H. Nakagomi, T. Hoshino, D. Yu Peressounko, R. Belmont, A. Drees, V. Babintsev, Prakhar Garg, J. Klatsky, Mirta Dumancic, J. B. Choi, M. Tomášek, V. Andrieux, S. Kudo, J. T. Mitchell, S. Mizuno, Alexei Khanzadeev, E. J. Kim, N. Feege, S. Syed, S. Karthas, D. Kotov, Tamas Novak, K. Ozawa, S. Campbell, J. M. Durham, S. Miyasaka, T. Sugitate, A. Sexton, D. Kawall, A. S. Nyanin, P. Gallus, K. Sedgwick, Yoshifumi Ueda, J. H. Do, C. L. Towell, N. Vukman, P. Montuenga, S. Huang, J. G. Lajoie, T. Murakami, Matthew Snowball, A. Denisov, D. Sharma, S. Yalcin, R. Seto, Jong-Min Park, Radek Novotny, H. W. Yu, T. W. Danley, R. P. Pisani, A. Timilsina, Christine Angela Aidala, X. H. Li, D. E. Mihalik, I. Tserruya, Koji Sato, S. I. Morrow, M. Patel, Y. H. Leung, J. D. Orjuela Koop, B. Azmoun, P. L. McGaughey, Bhartendu K. Singh, M. Jezghani, B. Fadem, W.E. Sondheim, Y. Ito, C. L. Woody, S. Park, M. J. Skoby, V. Singh, Y. Goto, S. F. Pate, A. Hodges, T. Sumita, J. Runchey, G. David, Sándor Lökös, K. N. Barish, D. Kincses, S. H. Lee, C. McKinney, S. Sato, T. Koblesky, S. Zharko, X. Jiang, S. L. Fokin, Carly W. Butler, J. Sun, J. S. Haggerty, M. Virius, A. Takeda, Balazs Ujvari, S. Tarafdar, N. Cronin, J. H. Kang, M. L. Purschke, I. Shein, S. D. Rolnick, T. Moon, H. F. Hamilton, Maya Hachiya Shimomura, R. S. Hollis, Vardan Khachatryan, Y. I. Makdisi, I. E. Yushmanov, X. He, C. Kim, R. Petti, Ferdinando Giordano, S. Bathe, Mihael Makek, M. Alfred, H. Yamamoto, M. Boer, P. V. Radzevich, V. Jorjadze, Michael William Phipps, K. L. Smith, S. Lee, Kei Nagashima, V. Canoa Roman, M. J. Tannenbaum, H. Masuda, K. Shigaki, K. Dehmelt, J. Imrek, K. Homma, M. Chiu, R. Cervantes, C. Ayuso, T. Niida, Raphael Noel Tieulent, Viktor Riabov, B. K. Schmoll, P. Shukla, A. Sen, H. Asano, Z. Rowan, E. O'Brien, Y. Watanabe, N. Novitzky, D. Reynolds, J. H. Yoo, M. Slunecka, M. Mendoza, M. L. Brooks, R. Seidl, Y. Kwon, D. K. Mishra, C. Gal, Xiong Wang, Julia Velkovska, C. Pinkenburg, Dong Jo Kim, Moonhee Kim, H. Ge, K. Nakano, S.V. Greene, I. Yoon, T. Elder, Qiao Xu, ShinIchi Esumi, A. Yanovich, A. Berdnikov, A. Lebedev, A. Sukhanov, T. Nagashima, I. V. Sourikova, H. Van Hecke, E. Kistenev, G. Tarnai, Z. Sun, M. Inaba, M. McCumber, C. Nattrass, T. Shioya, T. Rinn, M. Finger, Y. Riabov, A. N. Zelenski, D. E. Fields, Anders Nils Erik Oskarsson, H. Sako, M. Rosati, D. P. Morrison, M. I. Nagy, S. P. Sorensen, D. Kapukchyan, T-A Shibata, R. A. Soltz, A. Deshpande, M. Sarsour, C. A. Ogilvie, I. J. Choi, J. Sziklai, Y. Fukuda, C. L. Silva, A. D. Frawley, L. Zou, A. C. Mignerey, Kenneth Francis Read, M. Grosse Perdekamp, G. Mitsuka, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), PHENIX, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Quark, velocity, geometry, particle flow: collective phenomena, p+p, p+A, 200 GeV, QGP, flow, RHIC, PHEHIX, collective, Nuclear Theory, Hadron, General Physics and Astronomy, triangulation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, 010305 fluids & plasmas, quark, Nuclear physics, Momentum, nucleon nucleon, 0103 physical sciences, Nuclear Experiment, 010306 general physics, quark gluon: plasma, fluid, lifetime, Physics, formation, gluon, Plasma, momentum: anisotropy, Nuclear matter, charged particle, Charged particle, Gluon, Automatic Keywords, nucleus: heavy, 13. Climate action, nuclear matter, flow, Quark–gluon plasma, p nucleus, droplet, hadron
Abstract

International audience; Experimental studies of the collisions of heavy nuclei at relativistic energies have established the properties of the quark–gluon plasma (QGP), a state of hot, dense nuclear matter in which quarks and gluons are not bound into hadrons1–4. In this state, matter behaves as a nearly inviscid fluid5 that efficiently translates initial spatial anisotropies into correlated momentum anisotropies among the particles produced, creating a common velocity field pattern known as collective flow. In recent years, comparable momentum anisotropies have been measured in small-system proton–proton (p+p) and proton–nucleus (p+A) collisions, despite expectations that the volume and lifetime of the medium produced would be too small to form a QGP. Here we report on the observation of elliptic and triangular flow patterns of charged particles produced in proton–gold (p+Au), deuteron–gold (d+Au) and helium–gold (3He+Au) collisions at a nucleon–nucleon centre-of-mass energy $\sqrt {s_{{\mathrm{NN}}}} = 200$ GeV. The unique combination of three distinct initial geometries and two flow patterns provides unprecedented model discrimination. Hydrodynamical models, which include the formation of a short-lived QGP droplet, provide the best simultaneous description of these measurements.

Published
2018

33. Transverse single-spin asymmetries of midrapidity π0 and η mesons in polarized p+p collisions at s=200 GeV

Author

S. Bathe, Shoichi Hasegawa, Kensuke Homma, P. Kline, A. Dion, Prashant Shukla, S. F. Pate, E. Kistenev, Alice Mignerey, M. Beaumier, T. O. S. Haseler, D. K. Mishra, S. Miyasaka, M. Chiu, M. Rosati, Alexei Safonov, N. Apadula, Dhruv Utpalkumar Dixit, T. A. Shibata, R. Petti, S. Esumi, D. Sharma, X. Sun, Takao Sakaguchi, A. Sen, Tamás Csörgő, Martin Purschke, Hideki Hamagaki, W. Fan, D. Ivanishchev, G. David, T. Todoroki, V. Papavassiliou, K. I. Hahn, N. Cronin, H. Yamamoto, N. Feege, C. Xu, Agneta Oskarsson, D. Kincses, D. Lynch, C. E. Perezlara, S. Kudo, C. A. Ogilvie, M. Grosse Perdekamp, A. D. Frawley, M. E. Connors, S. K. Park, R. Cervantes, M. Larionova, Y. Berdnikov, V. Bumazhnov, D. Isenhower, Tamas Novak, S. H. Lee, T. K. Hemmick, Bhawani Singh, Y. Akiba, C. McKinney, A. Sexton, J. Sun, R. S. Towell, Brennan Schaefer, T. Majoros, T. Murakami, M. Tomášek, T. Moon, Alexander Milov, I. Nakagawa, K. Imai, C. Aidala, M. Giles, R. Seto, Y. Goto, A. Kingan, Vaclav Vrba, T. W. Danley, N. Novitzky, Y. Watanabe, H. F. Hamilton, P. Montuenga, V. Borisov, Z. Ji, G. D. N. Perera, Maya Hachiya Shimomura, Vardan Khachatryan, Y. I. Makdisi, D. Yu Peressounko, M. M. Mondal, E. Mannel, M. I. Nagy, V. S. Pantuev, Dennis Perepelitsa, Y. L. Yamaguchi, K. A. Drees, S. I. Morrow, B. Fadem, B. Kurgyis, P. Garg, A. Franz, J. Runchey, X. He, V. R. Loggins, J. T. Mitchell, K. DeBlasio, Ajeeta Khatiwada, J. H. Kang, J. S. Haggerty, Toru Sugitate, M. Potekhin, Iu. Mitrankov, D. P. Morrison, M. J. Tannenbaum, R. A. Soltz, Barbara Jacak, N. Hotvedt, R. Seidl, S. Mizuno, Don McGlinchey, Vladislav Manko, T. Hoshino, T. Sumita, C. Y. Chi, B. K. Schmoll, D. Richford, Senta Greene, J. Klatsky, A. Durum, C. L. Silva, S. Campbell, Kimberly Hill, D. Kapukchyan, Balazs Ujvari, Roli Esha, Dillon Scott Fitzgerald, J. B. Choi, K. L. Smith, N. S. Bandara, E. O'Brien, B. Mulilo, W. J. Metzger, Anne Marie Sickles, Byung-Sik Hong, J. Huang, Kei Nagashima, V. Canoa Roman, J. M. Durham, J. D. Osborn, Inseok Yoon, A. Bazilevsky, J. S. Bok, B. Blankenship, Yoshifumi Ueda, J. H. Do, Vladimir Samsonov, Christine Nattrass, Z. Rowan, C. L. Towell, Susumu Sato, N. Vukman, M. Mendoza, C. P. Singh, Alexei Khanzadeev, R. S. Hollis, N. A. Lewis, Raphael Noel Tieulent, B. M. Johnson, J. Bryslawskyj, D. Kawall, K. Tanida, Hari Guragain, L. Bichon, G. Tarnai, Z. Sun, A. Timilsina, W. Peng, P. W. Stankus, D. E. Fields, S. Huang, K. Dehmelt, H. W. Yu, Jong-Min Park, S. Tarafdar, H. En'yo, M. Finger, J. L. Nagle, Taku Gunji, T. Niida, A. Deshpande, Zvi Hirsh Citron, H. Asano, M. J. Leitch, H. Ge, K. Nakano, G. Mitsuka, J. Sziklai, M. McCumber, Timothy Thomas Rinn, A. Drees, A. Lebedev, I. Shein, J. E. Frantz, Viktor Riabov, I. J. Choi, V. Andrieux, D. Reynolds, W. E. Sondheim, J. H. Yoo, K. Sedgwick, Yanjun Wu, Sándor Lökös, Mihael Makek, R. Belmont, S. D. Rolnick, Xiong Wang, K. N. Barish, H. Van Hecke, M. Patel, N. Ramasubramanian, Y. J. Kwon, S. Zharko, X. Jiang, H. Sako, Min-Hye Kim, A. Enokizono, C. Gal, C. Pinkenburg, Qiao Xu, S. Karthas, D. S. Jumper, Y. H. Leung, Julia Velkovska, K. Lovasz, D. Silvermyr, Y. Zhai, D. Kotov, M. L. Brooks, A. Yanovich, I. Tserruya, M. Jezghani, V. Singh, A. Hodges, M. S. Daugherity, A. Iordanova, Serpil Yalcin, T. Koblesky, M. Csanad, M. Sarsour, S. P. Stoll, M. Virius, Ferdinando Giordano, J. Murata, D. Firak, Dmitry Blau, P. V. Radzevich, C. P. Wong, Eunja Kim, W. A. Zajc, J. D. Orjuela Koop, L. Xue, A. Denisov, Gregory James Ottino, Sergey Fokin, J. Hanks, D. Jouan, S. H. Lim, D. Larionova, V. Babintsev, I. E. Yushmanov, Y. Riabov, Kenta Shigaki, A. S. Nyanin, Rachid Nouicer, A. N. Zelenski, C. L. Woody, A. Berdnikov, Petr Gallus, T. Nagashima, I. V. Sourikova, S. P. Sorensen, J. G. Lajoie, M. Alfred, T. Hachiya, Michael William Phipps, S. Lee, Jennifer E. Perry, A. Sukhanov, K. Kurita, Matthew Snowball, C. O. Kim, S. Nelson, T. Shioya, E. J. Desmond, A. Pun, Xingguo Li, K. Nagai, R. Corliss, N. Grau, Shuo Han, Motoi Inaba, J. C. Hill, R. P. Pisani, U. Acharya, L. Zou, Minghui Liu, Kenneth Francis Read, A. V. Kazantsev, Y. Fukuda, Kyoichiro Ozawa, M. Slunečka, P. L. McGaughey, and B. Azmoun

Subjects
Physics, Particle physics, Meson, 010308 nuclear & particles physics, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Parton, Strangeness, 01 natural sciences, Gluon, Pseudorapidity, Isospin, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

We present a measurement of the transverse single-spin asymmetry for $\pi^0$ and $\eta$ mesons in $p^\uparrow$$+$$p$ collisions in the pseudorapidity range $|\eta

Published
2021

34. Probing Gluon Spin-Momentum Correlations in Transversely Polarized Protons through Midrapidity Isolated Direct Photons in p^{↑}+p Collisions at sqrt[s]=200 GeV

Author

U A, Acharya, C, Aidala, Y, Akiba, M, Alfred, V, Andrieux, N, Apadula, H, Asano, B, Azmoun, V, Babintsev, N S, Bandara, K N, Barish, S, Bathe, A, Bazilevsky, M, Beaumier, R, Belmont, A, Berdnikov, Y, Berdnikov, L, Bichon, B, Blankenship, D S, Blau, J S, Bok, M L, Brooks, J, Bryslawskyj, V, Bumazhnov, S, Campbell, V, Canoa Roman, R, Cervantes, C Y, Chi, M, Chiu, I J, Choi, J B, Choi, Z, Citron, M, Connors, R, Corliss, Y, Corrales Morales, N, Cronin, M, Csanád, T, Csörgő, T W, Danley, M S, Daugherity, G, David, K, DeBlasio, K, Dehmelt, A, Denisov, A, Deshpande, E J, Desmond, A, Dion, D, Dixit, J H, Do, A, Drees, K A, Drees, J M, Durham, A, Durum, A, Enokizono, H, En'yo, R, Esha, S, Esumi, B, Fadem, W, Fan, N, Feege, D E, Fields, M, Finger, D, Fitzgerald, S L, Fokin, J E, Frantz, A, Franz, A D, Frawley, Y, Fukuda, C, Gal, P, Gallus, P, Garg, H, Ge, M, Giles, F, Giordano, Y, Goto, N, Grau, S V, Greene, M, Grosse Perdekamp, T, Gunji, H, Guragain, T, Hachiya, J S, Haggerty, K I, Hahn, H, Hamagaki, H F, Hamilton, S Y, Han, J, Hanks, M, Harvey, S, Hasegawa, T O S, Haseler, X, He, T K, Hemmick, J C, Hill, K, Hill, A, Hodges, R S, Hollis, K, Homma, B, Hong, T, Hoshino, N, Hotvedt, J, Huang, S, Huang, K, Imai, M, Inaba, A, Iordanova, D, Isenhower, D, Ivanishchev, B V, Jacak, M, Jezghani, Z, Ji, X, Jiang, B M, Johnson, D, Jouan, D S, Jumper, J H, Kang, D, Kapukchyan, S, Karthas, D, Kawall, A V, Kazantsev, V, Khachatryan, A, Khanzadeev, A, Khatiwada, C, Kim, E-J, Kim, M, Kim, D, Kincses, A, Kingan, E, Kistenev, J, Klatsky, P, Kline, T, Koblesky, D, Kotov, S, Kudo, B, Kurgyis, K, Kurita, Y, Kwon, J G, Lajoie, D, Larionova, A, Lebedev, S, Lee, S H, Lee, M J, Leitch, Y H, Leung, N A, Lewis, X, Li, S H, Lim, M X, Liu, V-R, Loggins, S, Lökös, D A, Loomis, K, Lovasz, D, Lynch, T, Majoros, Y I, Makdisi, M, Makek, V I, Manko, E, Mannel, M, McCumber, P L, McGaughey, D, McGlinchey, C, McKinney, M, Mendoza, A C, Mignerey, A, Milov, D K, Mishra, J T, Mitchell, Iu, Mitrankov, M, Mitrankova, G, Mitsuka, S, Miyasaka, S, Mizuno, M M, Mondal, P, Montuenga, T, Moon, D P, Morrison, B, Mulilo, T, Murakami, J, Murata, K, Nagai, K, Nagashima, T, Nagashima, J L, Nagle, M I, Nagy, I, Nakagawa, K, Nakano, C, Nattrass, S, Nelson, T, Niida, R, Nouicer, T, Novák, N, Novitzky, G, Nukazuka, A S, Nyanin, E, O'Brien, C A, Ogilvie, J D, Orjuela Koop, J D, Osborn, A, Oskarsson, G J, Ottino, K, Ozawa, V, Pantuev, V, Papavassiliou, J S, Park, S, Park, S F, Pate, M, Patel, W, Peng, D V, Perepelitsa, G D N, Perera, D Yu, Peressounko, C E, PerezLara, J, Perry, R, Petti, M, Phipps, C, Pinkenburg, R P, Pisani, M, Potekhin, A, Pun, M L, Purschke, P V, Radzevich, N, Ramasubramanian, K F, Read, D, Reynolds, V, Riabov, Y, Riabov, D, Richford, T, Rinn, S D, Rolnick, M, Rosati, Z, Rowan, J, Runchey, A S, Safonov, T, Sakaguchi, H, Sako, V, Samsonov, M, Sarsour, S, Sato, B, Schaefer, B K, Schmoll, K, Sedgwick, R, Seidl, A, Sen, R, Seto, A, Sexton, D, Sharma, I, Shein, T-A, Shibata, K, Shigaki, M, Shimomura, T, Shioya, P, Shukla, A, Sickles, C L, Silva, D, Silvermyr, B K, Singh, C P, Singh, V, Singh, M, Slunečka, K L, Smith, M, Snowball, R A, Soltz, W E, Sondheim, S P, Sorensen, I V, Sourikova, P W, Stankus, S P, Stoll, T, Sugitate, A, Sukhanov, T, Sumita, J, Sun, Z, Sun, J, Sziklai, K, Tanida, M J, Tannenbaum, S, Tarafdar, A, Taranenko, G, Tarnai, R, Tieulent, A, Timilsina, T, Todoroki, M, Tomášek, C L, Towell, R S, Towell, I, Tserruya, Y, Ueda, B, Ujvari, H W, van Hecke, J, Velkovska, M, Virius, V, Vrba, N, Vukman, X R, Wang, Y S, Watanabe, C P, Wong, C L, Woody, C, Xu, Q, Xu, L, Xue, S, Yalcin, Y L, Yamaguchi, H, Yamamoto, A, Yanovich, J H, Yoo, I, Yoon, H, Yu, I E, Yushmanov, W A, Zajc, A, Zelenski, S, Zharko, and L, Zou

Abstract

Studying spin-momentum correlations in hadronic collisions offers a glimpse into a three-dimensional picture of proton structure. The transverse single-spin asymmetry for midrapidity isolated direct photons in p^{↑}+p collisions at sqrt[s]=200 GeV is measured with the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC). Because direct photons in particular are produced from the hard scattering and do not interact via the strong force, this measurement is a clean probe of initial-state spin-momentum correlations inside the proton and is in particular sensitive to gluon interference effects within the proton. This is the first time direct photons have been used as a probe of spin-momentum correlations at RHIC. The uncertainties on the results are a 50-fold improvement with respect to those of the one prior measurement for the same observable, from the Fermilab E704 experiment. These results constrain gluon spin-momentum correlations in transversely polarized protons.

Published
2021

35. Transverse momentum dependent forward neutron single spin asymmetries in transversely polarized p+p collisions at s=200 GeV

Author

M. Rosati, K. Tanida, Min-Hye Kim, Serpil Yalcin, T-A Shibata, S. Kudo, E. Kistenev, C. P. Wong, W. A. Zajc, L. Xue, Y. Fukuda, A. Denisov, Sergey Fokin, Martin Purschke, J. Bryslawskyj, J. D. Osborn, Inseok Yoon, G. D. N. Perera, M. Patel, N. Ramasubramanian, Mate Csanad, C. L. Woody, A. Berdnikov, Y. H. Leung, Y. Goto, Riabov, M. Finger, Zvi Hirsh Citron, X. Jiang, Y. J. Kwon, Hahn, K., I, S. Bathe, Kyoichiro Ozawa, G. Tarnai, Nagy, M., I, A. Deshpande, Hari Guragain, Alexander Milov, A. Iordanova, I. Nakagawa, J. Murata, I. Shein, Z. Sun, Alice Mignerey, K. A. Drees, S. Nelson, D. Firak, N. Novitzky, S. Tarafdar, A. Durum, M. Virius, K. Sedgwick, Kensuke Homma, B. Mulilo, Petr Gallus, I. J. Choi, N. S. Bandara, Dmitry Blau, M. S. Daugherity, Gregory James Ottino, Mihael Makek, J. D. Orjuela Koop, C. Aidala, Ferdinando Giordano, T. Nagashima, S. Miyasaka, E. Mannel, M. Chiu, H. Asano, K. L. Smith, T. Niida, A. Lebedev, J. Klatsky, D. P. Morrison, Morrow, S., I, Christine Nattrass, P. L. McGaughey, J. Hanks, I. V. Sourikova, M. Potekhin, G. Mitsuka, H. Sako, E. J. Desmond, J. E. Frantz, Singh, J. B. Choi, S. Campbell, R. A. Soltz, N. Cronin, X. Sun, Takao Sakaguchi, Prashant Shukla, Bumazhnov, S. F. Pate, T. Hoshino, A. Sen, Y. Zhai, C. L. Silva, C. P. Singh, A. Enokizono, N. Feege, Yanjun Wu, R. P. Pisani, D. S. Jumper, A. D. Frawley, W. J. Metzger, M. Beaumier, D. K. Mishra, I. E. Yushmanov, S. H. Lim, K. Lovasz, C. Gal, D. Larionova, J. Sun, J. M. Durham, Yoshifumi Ueda, J. H. Do, Khachatryan, K. Dehmelt, Alexei Khanzadeev, R. S. Hollis, L. Bichon, A. Pun, B. M. Johnson, Y. Riabov, Julia Velkovska, D. E. Fields, C. L. Towell, Susumu Sato, N. Vukman, S. Huang, Kenta Shigaki, Timothy Thomas Rinn, R. Belmont, N. Apadula, L. Zou, A. Kingan, D. Ivanishchev, M. Tomášek, U. Acharya, A. S. Nyanin, H. F. Hamilton, Maya Hachiya Shimomura, H. Yamamoto, Ajeeta Khatiwada, D. Reynolds, Senta Greene, Makdisi, Y., I, Xingguo Li, V. R. Loggins, J. T. Mitchell, M. McCumber, R. Cervantes, H. Van Hecke, D. Isenhower, Byung-Sik Hong, A. Bazilevsky, Tamas Novak, T. Moon, Rachid Nouicer, A. N. Zelenski, R. Petti, Kimberly Hill, Xiong Wang, C. E. Perezlara, J. L. Nagle, H. W. Yu, M. M. Mondal, N. Hotvedt, R. Seidl, S. Esumi, E. O'Brien, Samsonov, M. Giles, Minghui Liu, Y. Watanabe, W. Peng, P. W. Stankus, D. Sharma, S. P. Sorensen, K. Nagai, D. Kapukchyan, M. J. Tannenbaum, J. Huang, J. Sziklai, H. En'yo, B. K. Schmoll, B. Azmoun, I. Tserruya, T. Majoros, C. Pinkenburg, Kenneth Francis Read, M. J. Leitch, K. Imai, M. Jezghani, M. Grosse Perdekamp, A. Hodges, M. E. Connors, R. Corliss, N. Grau, J. G. Lajoie, T. Koblesky, M. Alfred, T. Hachiya, S. K. Park, M. Sarsour, Shuo Han, Michael William Phipps, S. Lee, Jennifer E. Perry, T. Shioya, Motoi Inaba, J. C. Hill, J. H. Yoo, P. Kline, A. Dion, P. V. Radzevich, E. J. Kim, T. Murakami, Pantuev, Z. Ji, D. Yu Peressounko, A. Sukhanov, Dennis Perepelitsa, Dillon Scott Fitzgerald, K. Kurita, Matthew Snowball, Kei Nagashima, J. H. Kang, V. Canoa Roman, J. S. Haggerty, C. O. Kim, P. Garg, Raphael Noel Tieulent, A. Timilsina, Borisov, Barbara Jacak, Jong-Min Park, Taku Gunji, A. Franz, J. Runchey, S. D. Rolnick, D. Richford, R. S. Towell, Roli Esha, Anne Marie Sickles, J. S. Bok, P. Montuenga, S. Karthas, T. Sumita, D. Kotov, C. Y. Chi, Balazs Ujvari, S. P. Stoll, D. Jouan, Iu. Mitrankov, Dhruv Utpalkumar Dixit, C. A. Ogilvie, T. K. Hemmick, Bhawani Singh, K. DeBlasio, C. Xu, Don McGlinchey, A. Sexton, A. Drees, R. Seto, T. O. S. Haseler, T. W. Danley, Alexei Safonov, B. Fadem, Hideki Hamagaki, W. Fan, G. David, T. Todoroki, Sándor Lökös, K. N. Barish, S. Zharko, M. L. Brooks, X. He, D. Lynch, Agneta Oskarsson, D. Kincses, M. Larionova, Y. Berdnikov, S. H. Lee, Y. Akiba, C. McKinney, Brennan Schaefer, Vaclav Vrba, Y. L. Yamaguchi, Tamas Ferenc Csorgo, S. Mizuno, B. Blankenship, N. A. Lewis, Babintsev, Qiao Xu, D. Silvermyr, Manko, V., I, A. Yanovich, Z. Rowan, M. Mendoza, H. Ge, K. Nakano, W. E. Sondheim, B. Kurgyis, Toru Sugitate, Andrieux, D. Kawall, Shoichi Hasegawa, A. V. Kazantsev, and Papavassiliou

Subjects
Physics, 010308 nuclear & particles physics, Nuclear Theory, 01 natural sciences, Nuclear physics, Transverse plane, 0103 physical sciences, Transverse momentum, High Energy Physics::Experiment, Neutron, Center of mass, Nuclear Experiment, 010306 general physics, Spin-½
Abstract

In 2015, the PHENIX collaboration has measured very forward ($\eta>6.8$) single-spin asymmetries of inclusive neutrons in transversely polarized proton-proton and proton-nucleus collisions at a center of mass energy of 200 GeV. A previous publication from this data set concentrated on the nuclear dependence of such asymmetries. In this measurement the explicit transverse-momentum dependence of inclusive neutron single spin asymmetries for proton-proton collisions is extracted using a bootstrapping-unfolding technique on the transverse momenta. This explicit transverse-momentum dependence will help improve the understanding of the mechanisms that create these asymmetries.

Published
2021

36. Production of π0 and η mesons in U+U collisions at sNN=192 GeV

Author

S. Y. Han, M. Gonin, A. Berdnikov, D. Kawall, Agneta Oskarsson, V. Bumazhnov, Y. Nakamiya, D. Lynch, D. Kincses, John Matthew Durham, M. Nihashi, D. Black, Hideyuki Oide, A. Sukhanov, M. Larionova, Y. Berdnikov, Dmitry Blau, K. Kurita, Y. Akiba, A. V. Kazantsev, N. Crossette, C. McKinney, S. Nagamiya, N. Novitzky, A. Meles, R. P. Pisani, Vaclav Vrba, S. Park, J. Murata, P. Sett, Alice Mignerey, D. E. Fields, C. O. Kim, L. D'Orazio, S. Miyasaka, A. Franz, R. Pak, U. Acharya, M. McCumber, B. Meredith, K. Ozawa, A. Garishvili, B. V. Jacak, E. Vazquez-Zambrano, I. Garishvili, S. Hasegawa, Y. J. Kwon, I. Shein, B. Komkov, R. A. Soltz, M. Grosse Perdekamp, G. David, L. Patel, X. Bai, F. Giordano, I. V. Sourikova, T. Hachiya, John Hill, Peter Christiansen, Z. Ji, D. Kotov, D. Yu Peressounko, X. Sun, Takao Sakaguchi, A. Ster, Takafumi Niida, J. Huang, B. Sahlmueller, E. J. Desmond, S. Nelson, Y. Sekiguchi, T. C. Awes, N. Riveli, Norio Saito, K. Sedgwick, D. S. Jumper, Henner Buesching, Y. Fukao, S. Solano, H. A. Torii, B. Kurgyis, Toru Sugitate, I. E. Yushmanov, K. B. Lee, H. Qu, A. D. Frawley, Y. J. Kim, Jason Kamin, B. M. Johnson, Mihael Makek, S. Butsyk, M. Csanad, L. Ding, Tsutomu Mibe, J. S. Kang, Charles Maguire, T. Hester, J. Seele, Peter Steinberg, M. Kofarago, Prakhar Garg, Vladimir Samsonov, B. Bannier, Animesh Datta, X. Gong, C. Y. Chi, D. Roach, A. Shaver, S. Choi, J. T. Mitchell, Y. Zhai, Christine Nattrass, M. Slunečka, S. Huang, T. Todoroki, K. M. Kijima, P. L. McGaughey, A. Pun, A. Sen, D. Larionova, M. Potekhin, François Fleuret, Alexei Khanzadeev, Sung Keun Park, A. Enokizono, Martin Purschke, V. S. Pantuev, R. Seidl, Vladislav Manko, C. A. Aidala, K. Hashimoto, R. S. Towell, Kiyoshi Tanida, L. Bichon, Xingguo Li, J. S. Kapustinsky, V. Babintsev, E. Stenlund, C. Baumann, J. B. Choi, N. N. Ajitanand, Prashant Shukla, S. F. Pate, T. Hoshino, A. Isinhue, E. Kistenev, Dipak Kumar Mishra, M. Kurosawa, M. I. Nagy, Tomofumi Nagae, B. Ujvari, G. D. N. Perera, A. Taranenko, Ke. Nakamura, D. Jouan, N. Ramasubramanian, X. Jiang, Maya Hachiya Shimomura, R. S. Hollis, S. P. Sorensen, R. Belmont, S. Wolin, Takahiro Nakamura, J. L. Nagle, D. McGlinchey, W. J. Metzger, D. Richford, Y. I. Makdisi, M. S. Ryu, S. J. Jeon, Takahiro Fusayasu, M. Leitgab, Viktor Riabov, K. Okada, Yoshifumi Ueda, J. H. Do, Qiao Xu, Brajesh K. Singh, J. A. Key, Ryugo S. Hayano, L. Zou, B. Lewis, D. Watanabe, Soumya Mohapatra, M. J. Leitch, A. Durum, Pawan Kumar Netrakanti, J. Sun, E. Vznuzdaev, D. Silvermyr, Motoi Inaba, A. Timilsina, A. Deshpande, M. Stepanov, Y. Riabov, J. Bryslawskyj, Kenta Shigaki, D. Ivanishchev, S. Baumgart, N. Apadula, Minghui Liu, T. V. Moukhanova, A. Drees, V. Papavassiliou, C. E. Perezlara, Hari Guragain, S. Mizuno, M. Moskowitz, A. Yanovich, H. W. Van Hecke, S. Whitaker, Jennifer E. Perry, A. S. Nyanin, M. J. Tannenbaum, Rachid Nouicer, A. N. Zelenski, Kenneth Francis Read, J. Hanks, T. Ichihara, Hiroyuki Sako, Sook Hyun Lee, T. Murakami, Yi Gu, B. Blankenship, M. Mendoza, J. G. Lajoie, Kensuke Homma, E. Richardson, C. L. Silva, Y. Tanaka, Y. Watanabe, V. Khachatryan, H. Asano, E. Tennant, M. S. Daugherity, C. P. Singh, I. Younus, M. Tomášek, M. Skolnik, James Alexander, Filip Krizek, N. A. Lewis, M. R. Stone, K. Nakano, S. Bathe, W. E. Sondheim, B. Azmoun, R. J. Petti, S. I. Morrow, S. Sawada, D. Firak, Byung-Sik Hong, J. Runchey, A. Bazilevsky, T. Novák, K. Boyle, C. P. Wong, M. Chiu, C. A. Ogilvie, M. Connors, W. A. Zajc, Brian Cole, Alexandre Lebedev, P. Kline, K. S. Lee, T. Majoros, T. K. Hemmick, D. M. Lee, G. H. Lee, V. Baublis, A. Denisov, Yuki Watanabe, V. Cianciolo, M. Beaumier, Sergey Fokin, D. Sharma, K. S. Joo, I. J. Choi, B. Xia, S. Esumi, Dennis Perepelitsa, Yasuo Miake, Anne Marie Sickles, K. Gainey, J. S. Bok, D. Kotchetkov, K. DeBlasio, Atsushi Takahara, K. A. Drees, J. Rak, K. O. Eyser, J. Klatsky, S. H. Lim, R. Lacey, R. Granier de Cassagnac, Jongmin Lee, K. L. Smith, P. K. Khandai, A. Taketani, Y. Ikeda, E. J. Mannel, T. Rinn, Yanjun Wu, R. Akimoto, C. Gal, K. Watanabe, C. Pinkenburg, Klaus Dehmelt, Julia Velkovska, A. Khatiwada, Z. Sun, Taku Gunji, M. Patel, M. Rosati, Tamás Csörgő, S. Tarafdar, M. Virius, E. T. Atomssa, Senta Greene, B. Fadem, E. O'Brien, Jiangyong Jia, Y. Goto, C. H. Chen, S. Yokkaichi, D. Kleinjan, S. Campbell, S. Zhou, A. Manion, R. Esha, J. H. Kang, I. Ravinovich, J. S. Haggerty, S. D. Rolnick, M. Bai, Y. S. Lai, J. D. Osborn, Inseok Yoon, Zhiying You, D. J. Kim, M. Finger, Dillon Scott Fitzgerald, V. Canoa Roman, B. Mulilo, N. Cronin, K. Shoji, Susumu Sato, S. Kanda, W. Peng, P. W. Stankus, Ajit Kumar Mohanty, T. A. Shibata, V. Borisov, N. Grau, I. Tserruya, M. Jezghani, Iu. Mitrankov, Y. Imazu, V. Singh, A. Hodges, D. Isenhower, Kenichi Imai, T. Koblesky, T. Moon, S. P. Stoll, F. Wei, Hideki Hamagaki, W. Fan, K. Aoki, M. Vargyas, K. I. Hahn, A. Glenn, P. V. Radzevich, Eunja Kim, Jen-Chieh Peng, J. E. Frantz, D. Reynolds, Inkyu Park, Xiong Wang, M. Wysocki, Sándor Lökös, K. N. Barish, Alexander Milov, I. Nakagawa, Young-Ki Kim, T. Engelmore, O. Drapier, S. Zharko, D. P. Morrison, B. H. Kang, Tatsuya Chujo, M. L. Brooks, Y. L. Yamaguchi, R. Seto, X. He, Robert Vertesi, J. Koster, C. L. Woody, A. Veicht, A. Mwai, M. Sarsour, and A. Iordanova

Subjects
Physics, Particle physics, Meson, 010308 nuclear & particles physics, 0103 physical sciences, Production (economics), 010306 general physics, 01 natural sciences
Published
2020

37. Measurement of jet-medium interactions via direct photon-hadron correlations in Au+Au and d+Au collisions at sNN=200 GeV

Author

Atsushi Takahara, K. A. Drees, A. V. Kazantsev, C. M. Camacho, Gary Grim, R. S. Towell, Prashant Shukla, Dmitry Blau, K. V. Dharmawardane, L. Tomášek, S. F. Pate, Ke. Nakamura, P. Mikeš, Y. Nakamiya, D. Lynch, H. Al-Bataineh, J. A. Key, J. Klatsky, P. Tarján, G. Baksay, J. B. Choi, L. Patel, I. Tserruya, S. Tarafdar, J. Hanks, S. Motschwiller, D. Ivanishchev, B. Voas, V. Papavassiliou, R. S. Hollis, C. E. Perezlara, E. P. Hartouni, V. Singh, H. Asano, T. C. Awes, E. Vazquez-Zambrano, E. J. Desmond, A. Hodges, Kyoichiro Ozawa, T. Liška, Jun Kikuchi, Z. Sun, A. Yu. Semenov, M. Rosati, D. Kawall, Yuhei Morino, A. Nederlof, T. Murakami, E. M. Takagui, Eva Haslum, K. O. Eyser, Y. Onuki, Y. Imazu, Shoichi Hasegawa, S. Choi, T. Niida, S. P. Stoll, A. Sen, V. S. Pantuev, M. Sano, A. Lebedev, A. Rakotozafindrabe, Jan Rak, R. Lacey, M. Sarsour, Mate Csanad, Tomoya Tsuji, M. Mendoza, S. N. White, L. Zou, J. G. Lajoie, Deepa Thomas, K. Tanida, J. Hamblen, M. Nihashi, M. Skolnik, S. I. Morrow, S. Baumgart, S. Bathe, R. Granier de Cassagnac, Charles Maguire, Kenjiro Miki, Bruno Lenzi, N. Crossette, R. P. Pisani, Tamás Csörgő, U. Acharya, M. McCumber, P. Garg, S. Sawada, Masamichi Ishihara, A. Glenn, P. V. Radzevich, A. Ster, Y. Fukao, B. Azmoun, Y. J. Mao, M. Kawashima, Hiromi Iinuma, T. Hester, E. Kistenev, B. Ujvari, M. Kasai, N. A. Sparks, J. Ying, J. Runchey, A. Isinhue, N. Grau, H. Qu, M. Leitgab, Shuo Han, Eunja Kim, Motoi Inaba, J. C. Hill, Minghui Liu, R. M. Wright, Sung Keun Park, C. Baumann, Zvi Hirsh Citron, S. Yokkaichi, P. Lichtenwalner, Kensuke Homma, E. Richardson, Senta Greene, P. Rosnet, K. Fujiwara, H. Obayashi, Y. Tsuchimoto, A. Berdnikov, J. Newby, Hideki Hamagaki, W. Fan, K. Aoki, M. Vargyas, G. David, T. Todoroki, Y. Iwanaga, K. Das, K. Nakano, M. Heffner, Kenneth Francis Read, N. N. Ajitanand, K. Okada, Gerd Joachim Kunde, D. Richford, S. Taneja, H. Van Hecke, K. B. Kim, J. Alexander, Y. L. Yamaguchi, Frank Ellinghaus, B. Bassalleck, K. Karatsu, K. I. Hahn, B. Sahlmueller, H. A. Gustafsson, A. Král, S. Kametani, H. En'yo, Alexander Milov, I. Nakagawa, R. Luechtenborg, A. A. Vinogradov, S. P. Whitaker, A. Caringi, M. J. Leitch, I. Shein, E. Leitner, M. Patel, N. Ramasubramanian, T. Ichihara, Y. Ikeda, Takahiro Nakamura, M. Konno, H. Pei, Y. Hori, Anne Marie Sickles, H. Themann, K. Gainey, Young-Ki Kim, T. Engelmore, N. Novitzky, O. Drapier, C. P. Singh, K. Sedgwick, J. Midori, I. Younus, V. Borisov, Peter Christiansen, J. S. Bok, B. M. Johnson, P. Kline, K. S. Lee, A. Dion, E. O'Brien, Paul Constantin, M. Grosse Perdekamp, J. Huang, Bum-Hoon Lee, E. J. Mannel, T. Rinn, J. T. Mitchell, R. Seidl, G. R. Young, I. E. Yushmanov, A. Taranenko, W. E. Sondheim, E. R. Kinney, D. P. Morrison, Vladislav Manko, S. Campbell, B. H. Kang, S. Wolin, B. Blankenship, Susumu Oda, R. Akimoto, Jiangyong Jia, Y. Goto, N. Kamihara, T. Horaguchi, Mihael Makek, X. Jiang, C. Pinkenburg, N. A. Lewis, M. K. Dayananda, Aram Kim, F. Matathias, T. W. Jones, Filip Krizek, H. J. Kim, Vladimir Samsonov, Tatsuya Chujo, K. Dehmelt, S. R. P. Mohapatra, C. Zhang, A. Durum, Dillon Scott Fitzgerald, Iu. Mitrankov, T. Kempel, V. Canoa Roman, P. Chung, S. K. Park, P. Liebing, M. Wysocki, Jen-Chieh Peng, P. Ružička, A. Kiss, Byoungchoo Park, A. Isupov, B. Bannier, K. S. Sim, Christine Nattrass, A. Garishvili, J. Imrek, Y. Gu, K. Boyle, P. A. Rukoyatkin, M. Stepanov, G. Roche, P. Steinberg, D. Kleinjan, M. S. Ryu, D. Reynolds, S. Belikov, K. S. Joo, Torsten Dahms, K. Yamaura, M. Potekhin, C. Oakley, A. Drees, Henner Buesching, R. Yang, I. V. Sourikova, C. Vale, J. Sziklai, Steve Edwards, Yu. Efremenko, D. K. Mishra, Inkyu Park, A. Meles, R. A. Soltz, Ajit Kumar Mohanty, T. A. Shibata, T. Sato, Xiong Wang, B. Love, Z. Conesa del Valle, M. Naglis, T. Majoros, K. L. Smith, Takahiro Fusayasu, J. H. Kang, Y. Miyachi, Dong Jo Kim, Alexander Malakhov, K. Imai, M. Proissl, J. S. Haggerty, S. R. Lee, C. L. Silva, D. H. Kim, Brian Cole, M. S. Daugherity, Alberica Toia, D. Isenhower, T. Moon, Viktor Riabov, Z. Ji, D. Winter, Hongfang Liu, D. E. Fields, N. Apadula, X. Gong, M. Chiu, D. Yu Peressounko, Dennis Perepelitsa, Taku Gunji, H. Gong, F. Kajihara, A. Veicht, A. Basye, A. Vossen, C. A. Ogilvie, Y. Tanaka, Jihyun Bhom, Qiao Xu, Y. J. Kwon, J. M. Durham, D. Silvermyr, Eun Joo Kim, I. Garishvili, O. Dietzsch, F. Wei, Ryugo S. Hayano, A. K. Purwar, Ferdinando Giordano, S. Butsyk, Y. Komatsu, Aaron Angerami, S. Zhou, E. T. Atomssa, Yoshifumi Ueda, J. H. Do, R. Esha, R. Petti, Kisung Lee, T. K. Hemmick, Bhawani Singh, Yasuo Miake, Y. Riabov, M. Javani, S. D. Rolnick, H. Valle, Susumu Sato, B. Mulilo, Tomofumi Nagae, J. L. Nagle, Yanjun Wu, K. Watanabe, Dipanwita Dutta, Nagahiro Saito, C. P. Wong, N. Riveli, S. Esumi, Y. S. Lai, L. A. Linden Levy, D. Sharma, C. Gal, J. S. Kang, R. Ichimiya, L. S. Zolin, S. W. Nam, W. J. Park, K. DeBlasio, Christopher Rosen, L. Kochenda, M. Issah, P. Castera, Kenta Shigaki, H. J. Moon, L. Baksay, M. Nguyen, M. Connors, W. A. Zajc, Julia Velkovska, A. Khatiwada, Y. Zhai, A. Iordanova, K. Shoji, J. Ide, J. Murata, V. Baublis, Yongsun Kim, Don McGlinchey, K. Sakashita, A. G. Litvinenko, D. Firak, Martin Purschke, C. A. Aidala, W. Peng, P. W. Stankus, B. Komkov, A. Denisov, Yuki Watanabe, V. Cianciolo, D. Kotov, L. Guo, Alexei Khanzadeev, Agneta Oskarsson, D. Kincses, Shinichi Masumoto, A. Yanovich, L. Bichon, E. Stenlund, D. Kotchetkov, S. Huang, A. S. Nyanin, M. Larionova, Animesh Datta, Sergey Fokin, C. Y. Chi, Y. Berdnikov, M. Moskowitz, S. S.E. Rosendahl, Rachid Nouicer, Tsutomu Mibe, M. A. L. Leite, G. Bunce, J.-G. Park, A. N. Zelenski, Y. Watanabe, S. H. Lee, Z. Fraenkel, N. Cronin, C. Silvestre, Yasutada Akiba, C. McKinney, M. Mishra, S. Nagamiya, R. K. Choudhury, D. Hornback, D. Jouan, Vaclav Vrba, Klaus Johannes Reygers, Astrid Morreale, Rui Wei, M. Kurosawa, S. H. Lim, S. Solano, T. V. Moukhanova, R. Belmont, B. Meredith, D. Larionova, Marisilvia Donadelli, J. S. Kapustinsky, A. Adare, V. Babintsev, B. Lewis, V. Bumazhnov, D. Black, M. Tomášek, John Wood, J. P. Wessels, J. Seele, G. S. Kyle, Alice Mignerey, L. D'Orazio, S. Miyasaka, A. Franz, M. Ouchida, S. Hayashi, N. Means, J. Jin, Byung-Sik Hong, A. Bazilevsky, H. A. Torii, B. Kurgyis, Toru Sugitate, Pawan Kumar Netrakanti, X. Sun, D. M. Lee, A. Kozlov, R. Seto, K. Kiriluk, François Fleuret, Takao Sakaguchi, R. Tanabe, Jason Kamin, B. Fadem, A. D. Frawley, X. He, J. Sun, Y. Aramaki, V. Peresedov, Robert Vertesi, Barbara Jacak, Rushan Han, Wesley James Metzger, W. Holzmann, J. Koster, Maya Hachiya Shimomura, Vardan Khachatryan, Y. I. Makdisi, H. Masui, A. A. Bickley, C. L. Woody, A. Mwai, Sándor Lökös, K. N. Barish, S. Zharko, S. Sano, M. L. Brooks, M. J. Tannenbaum, E. Tennant, S. Rembeczki, S. Dairaku, M. Virius, Manabu Togawa, C. H. Chen, A. Manion, I. Ravinovich, M. Bai, E. C. Aschenauer, J. D. Osborn, Inseok Yoon, Zhiying You, R. Bennett, T. L.T. Thomas, M. Finger, J. E. Frantz, Jongmin Lee, A. Enokizono, P. K. Khandai, A. Taketani, Priyanka Sett, D. S. Jumper, Makoto Oka, K. B. Lee, S. Nelson, L. Ding, D. Roach, K. M. Kijima, A. Pun, K. Hashimoto, Xingguo Li, M. Gonin, H. Al-Ta'Ani, A. Sukhanov, K. Kurita, H. Pereira, C. O. Kim, R. Pak, S. Kaneti, S. P. Sorensen, O. Chvala, Seong H. Kim, T. Hachiya, A. Kravitz, S. V. Afanasiev, H. Sako, M. I. Nagy, D. Watanabe, Marcus Hohlmann, M. D. Malik, E. Vznuzdaev, J. Bryslawskyj, I. Danchev, Beomkyu Kim, Wei Xie, A. Deshpande, I. J. Choi, B. Xia, Tadaaki Isobe, M. Slunečka, P. L. McGaughey, Ralf Peter Averbeck, and A. Nukariya

Subjects
Quark, Physics, Photon, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Nuclear matter, 01 natural sciences, Nuclear physics, Deuterium, Fragmentation (mass spectrometry), 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract

We present direct photon-hadron correlations in 200 GeV/A Au+Au, d+Au, and p+p collisions, for direct photon pT from 5–12 GeV/c, collected by the PHENIX Collaboration in the years from 2006 to 2011. We observe no significant modification of jet fragmentation in d+Au collisions, indicating that cold nuclear matter effects are small or absent. Hadrons carrying a large fraction of the quark's momentum are suppressed in Au+Au compared to p+p and d+Au. As the momentum fraction decreases, the yield of hadrons in Au+Au increases to an excess over the yield in p+p collisions. The excess is at large angles and at low hadron pT and is most pronounced for hadrons associated with lower momentum direct photons. Comparison to theoretical calculations suggests that the hadron excess arises from medium response to energy deposited by jets.

Published
2020

38. Production of bb¯ at forward rapidity in p+p collisions at s=510 GeV

Author

Takafumi Niida, J. Huang, Prakhar Garg, A. Sen, B. Bannier, D. Lynch, M. Beaumier, Min-Hye Kim, K. S. Joo, T. Murakami, Yi Gu, R. S. Towell, Prashant Shukla, S. F. Pate, J. A. Key, D. Ivanishchev, V. Papavassiliou, C. E. Perezlara, S. I. Morrow, S. Sawada, A. Franz, J. Runchey, E. Joo, M. Stepanov, M. Potekhin, H. Nakagomi, T. Hoshino, D. Sharma, K. L. Smith, Norio Saito, A. Enokizono, R. A. Soltz, L. Zou, M. Grosse Perdekamp, Hari Guragain, J. Seele, V. Bumazhnov, D. Black, S. Esumi, J. Murata, D. Firak, M. I. Nagy, W. J. Metzger, D. Richford, Yoshifumi Ueda, J. H. Do, Minghui Liu, Kiyoshi Tanida, E. Kistenev, Sook Hyun Lee, H. Asano, D. Watanabe, J. T. Mitchell, F. Giordano, Atsushi Takahara, Alexander Milov, I. Nakagawa, Young-Ki Kim, Alexei Khanzadeev, L. Bichon, Anne Marie Sickles, E. Vznuzdaev, R. Seidl, B. Schaefer, V. S. Pantuev, D. Larionova, B. Azmoun, J. S. Bok, Vladislav Manko, D. Kawall, Kenneth Francis Read, T. A. Shibata, J. B. Choi, Maya Hachiya Shimomura, R. S. Hollis, T. Hachiya, K. A. Drees, Z. Sun, N. N. Ajitanand, G. D. N. Perera, S. Tarafdar, J. Sun, V. Babintsev, Dipak Kumar Mishra, D. H. Kim, D. P. Morrison, J. Rak, Y. I. Makdisi, Yanjun Wu, S. Park, A. J. Miller, P. Kline, A. Dion, Zvi Hirsh Citron, J. Klatsky, A. Sukhanov, K. Kurita, C. Gal, H. En'yo, N. Ramasubramanian, X. Jiang, I. Shein, Klaus Dehmelt, Julia Velkovska, C. L. Silva, A. Khatiwada, M. Virius, E. T. Atomssa, N. Feege, M. J. Leitch, Tatsuya Chujo, I. Tserruya, M. Jezghani, T. V. Moukhanova, Z. Ji, D. Yu Peressounko, K. Sedgwick, V. Singh, A. Hodges, M. Rosati, S. H. Lim, Tamás Csörgő, Mihael Makek, A. Deshpande, R. Lacey, A. Timilsina, M. J. Tannenbaum, A. Adare, Y. Riabov, B. M. Johnson, T. Koblesky, J. D. Orjuela Koop, Animesh Datta, T. Sumita, E. J. Desmond, A. Durum, J. Bryslawskyj, C. Y. Chi, M. Slunečka, P. L. McGaughey, C. H. Chen, Kenta Shigaki, M. Sarsour, F. Wei, D. Isenhower, B. K. Schmoll, C. O. Kim, T. Moon, A. Manion, B. Meredith, Xiao-yan Li, J. Hanks, Y. Watanabe, Hiroyuki Sako, A. S. Nyanin, R. Pak, I. Ravinovich, Balazs Ujvari, M. Leitgab, Rachid Nouicer, Y. J. Kwon, Jiangyong Jia, Y. Goto, A. Glenn, P. V. Radzevich, A. N. Zelenski, Kensuke Homma, S. Beckman, I. E. Yushmanov, S. Nelson, Senta Greene, Motoi Inaba, A. Meles, Eunja Kim, A. V. Kazantsev, M. Bai, M. S. Daugherity, C. P. Singh, D. Kleinjan, Mate Csanad, A. Iordanova, Alice Mignerey, T. Majoros, Jen-Chieh Peng, J. G. Rubin, A. Taranenko, S. Campbell, B. Fadem, E. O'Brien, S. Miyasaka, S. Y. Han, J. E. Frantz, C. L. Woody, A. Berdnikov, D. E. Fields, L. Ding, J. S. Kang, M. Kofarago, N. S. Bandara, Byung-Sik Hong, D. Reynolds, A. Bazilevsky, X. Sun, M. Nihashi, S. J. Jeon, J. D. Osborn, D. McGlinchey, Inseok Yoon, B. V. Jacak, D. Roach, Y. Zhai, A. Pun, Takao Sakaguchi, Vladimir Samsonov, Petr Gallus, H. J. Kim, G. David, I. J. Choi, B. Xia, L. Patel, Dennis Perepelitsa, Christine Nattrass, N. A. Lewis, Xiong Wang, R. J. Petti, Taku Gunji, T. Todoroki, M. Finger, Alexandre Lebedev, Y. Ikeda, A. D. Frawley, K. Ozawa, N. Novitzky, N. Riveli, R. P. Pisani, M. Towell, Brajesh K. Singh, T. C. Awes, M. Patel, I. V. Sourikova, Viktor Riabov, K. B. Lee, U. Acharya, Serpil Yalcin, S. Huang, J. Sziklai, M. McCumber, S. P. Sorensen, E. J. Mannel, M. Wysocki, T. Rinn, A. Taketani, C. P. Wong, J. G. Lajoie, M. Alfred, S. Whitaker, Jennifer E. Perry, M. Connors, W. A. Zajc, L. Xue, R. Akimoto, R. Esha, A. Denisov, Yuki Watanabe, C. Pinkenburg, S. D. Rolnick, M. Kurosawa, Sergey Fokin, D. J. Kim, J. H. Kang, J. S. Haggerty, J. L. Nagle, Dillon Scott Fitzgerald, V. Canoa Roman, R. Belmont, Susumu Sato, Y. Imazu, Kenichi Imai, Sándor Lökös, K. N. Barish, S. Zharko, Hideki Hamagaki, W. Fan, M. Vargyas, K. I. Hahn, P. Montuenga, V. Borisov, N. Grau, M. L. Brooks, Iu. Mitrankov, Y. L. Yamaguchi, B. Mulilo, M. Tomášek, W. Peng, P. W. Stankus, A. Sexton, R. Seto, X. He, Y. Aramaki, J. Koster, A. Mwai, D. Kotov, D. S. Jumper, S. P. Stoll, D. Jouan, S. Wolin, N. Apadula, A. Drees, S. Bathe, M. Chiu, C. A. Ogilvie, T. K. Hemmick, Yasuo Miake, K. DeBlasio, R. Pinson, Martin Purschke, C. A. Aidala, Pawan Kumar Netrakanti, V. Khachatryan, S. Hasegawa, Henner Buesching, I. Younus, Agneta Oskarsson, D. Kincses, John Matthew Durham, M. Larionova, Y. Berdnikov, Y. Akiba, C. McKinney, S. Nagamiya, Vaclav Vrba, S. Mizuno, H. W. Van Hecke, B. Blankenship, K. Kihara, Qiao Xu, D. Silvermyr, A. Yanovich, Z. Rowan, M. Mendoza, H. Ge, K. Nakano, W. E. Sondheim, K. Boyle, John Hill, H. A. Torii, B. Kurgyis, Toru Sugitate, and P. Sett

Subjects
Quantum chromodynamics, Physics, Particle physics, Muon, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Order (ring theory), 01 natural sciences, Gluon, 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), Rapidity, PHENIX detector, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

The cross section of bottom quark-antiquark ($b\bar{b}$) production in $p$+$p$ collisions at $\sqrt{s}=510$ GeV is measured with the PHENIX detector at the Relativistic Heavy Ion Collider. The results are based on the yield of high mass, like-sign muon pairs measured within the PHENIX muon arm acceptance ($1.2 1$ GeV/$c$, and dimuon mass of 5--10 GeV/$c^2$. The extrapolated total cross section at this energy for $b\bar{b}$ production is $13.1 \pm 0.6~(\mbox{stat}) \pm 1.5~(\mbox{syst}) \pm 2.7~(\mbox{global})~\mu$b. The total cross section is compared to a perturbative quantum chromodynamics calculation and is consistent within uncertainties. The azimuthal opening angle between muon pairs from $b\bar{b}$ decays and their $p_T$ distributions are compared to distributions generated using {\sc ps pythia 6}, which includes next-to-leading order processes. The azimuthal correlations and pair $p_T$ distribution are not very well described by {\sc pythia} calculations, but are still consistent within uncertainties. Flavor creation and flavor excitation subprocesses are favored over gluon splitting.

Published
2020

39. Polarization and cross section of midrapidity J/ψ production in p+p collisions at s=510 GeV

Author

A. J. Miller, Martin Purschke, C. A. Aidala, Y. Imazu, Y. J. Kwon, J. Seele, A. Sukhanov, K. Kurita, T. Murakami, Yi Gu, S. I. Morrow, S. Sawada, J. Runchey, M. Potekhin, M. S. Daugherity, C. P. Singh, N. A. Lewis, R. J. Petti, S. Mizuno, Pawan Kumar Netrakanti, Kenichi Imai, J. S. Kang, Y. Zhai, V. Khachatryan, Dillon Scott Fitzgerald, V. Canoa Roman, C. O. Kim, R. Pak, A. Enokizono, D. Kotov, D. S. Jumper, S. H. Lim, J. Sziklai, Kiyoshi Tanida, M. Slunečka, B. Azmoun, Susumu Sato, Atsushi Takahara, K. A. Drees, H. W. Van Hecke, P. L. McGaughey, J. Klatsky, Jen-Chieh Peng, J. G. Rubin, Hideki Hamagaki, W. Fan, M. Vargyas, H. Nakagomi, T. Hoshino, B. Blankenship, E. Joo, M. Stepanov, K. I. Hahn, Hari Guragain, E. Kistenev, J. H. Kang, J. E. Frantz, J. S. Haggerty, Sook Hyun Lee, P. Kline, A. Dion, Z. Rowan, M. Mendoza, H. Asano, Maya Hachiya Shimomura, R. S. Hollis, B. Ujvari, B. Mulilo, J. G. Lajoie, I. J. Choi, D. Reynolds, B. Xia, S. Beckman, Dennis Perepelitsa, Y. I. Makdisi, M. Beaumier, M. Towell, K. S. Joo, D. Jouan, M. Tomášek, H. Ge, D. Richford, Y. Riabov, J. Bryslawskyj, K. Nakano, W. Peng, N. N. Ajitanand, P. W. Stankus, Kenta Shigaki, M. J. Tannenbaum, W. E. Sondheim, R. S. Towell, G. D. N. Perera, Yoshifumi Ueda, J. H. Do, J. Sun, Viktor Riabov, B. K. Schmoll, A. Taketani, V. Bumazhnov, D. Black, Xiong Wang, S. Esumi, K. Boyle, N. Feege, X. He, Animesh Datta, T. Sumita, C. Y. Chi, A. S. Nyanin, A. Durum, B. M. Johnson, Dong Jo Kim, Rachid Nouicer, A. N. Zelenski, Alice Mignerey, A. Taranenko, S. Miyasaka, A. Franz, S. J. Jeon, Brajesh K. Singh, X. Sun, A. Deshpande, Y. Aramaki, A. Meles, Takao Sakaguchi, D. E. Fields, T. Majoros, S. P. Sorensen, B. V. Jacak, A. D. Frawley, N. Riveli, K. B. Lee, S. Huang, Wesley James Metzger, J. Koster, M. Kurosawa, C. L. Silva, R. Belmont, Serpil Yalcin, C. P. Wong, S. Wolin, M. Wysocki, M. Alfred, S. Whitaker, M. Connors, W. A. Zajc, L. Xue, D. Sharma, A. Denisov, Yuki Watanabe, M. I. Nagy, Jennifer E. Perry, I. Tserruya, I. Ravinovich, Sergey Fokin, D. Watanabe, S. Hasegawa, Y. Watanabe, Anne Marie Sickles, M. Jezghani, D. Lynch, B. Schaefer, E. Vznuzdaev, Y. Ikeda, J. S. Bok, E. J. Mannel, T. Rinn, M. Bai, T. A. Shibata, B. Meredith, V. Singh, A. Hodges, C. L. Woody, Jan Rak, N. S. Bandara, R. Lacey, A. Mwai, A. Adare, Vladimir Samsonov, Henner Buesching, Christine Nattrass, T. Todoroki, J. D. Osborn, D. Isenhower, T. Moon, T. Koblesky, Inseok Yoon, John Hill, H. A. Torii, B. Kurgyis, S. P. Stoll, F. Wei, E. J. Desmond, Taku Gunji, Toru Sugitate, S. Nelson, J. L. Nagle, M. Patel, M. Finger, A. Berdnikov, R. Esha, S. D. Rolnick, L. Ding, M. Kofarago, D. Roach, A. Pun, K. Kihara, Qiao Xu, M. Virius, E. T. Atomssa, Petr Gallus, A. Glenn, P. V. Radzevich, D. Silvermyr, J. T. Mitchell, R. Seidl, Vladislav Manko, I. Younus, Eunja Kim, A. Yanovich, K. Ozawa, I. V. Sourikova, J. D. Orjuela Koop, Agneta Oskarsson, A. Timilsina, C. H. Chen, D. Kincses, John Matthew Durham, Kensuke Homma, M. Larionova, Y. Berdnikov, Y. Akiba, A. Manion, C. McKinney, S. Nagamiya, Vaclav Vrba, L. Zou, K. L. Smith, Y. L. Yamaguchi, Alexander Milov, Minghui Liu, I. Nakagawa, Young-Ki Kim, Prashant Shukla, Kenneth Francis Read, S. F. Pate, D. McGlinchey, J. A. Key, D. Ivanishchev, V. Papavassiliou, C. E. Perezlara, H. J. Kim, D. P. Morrison, A. Sexton, P. Sett, Takafumi Niida, J. Huang, Prakhar Garg, B. Bannier, R. Seto, A. V. Kazantsev, Yanjun Wu, Tatsuya Chujo, I. E. Yushmanov, C. Gal, Sándor Lökös, K. N. Barish, S. Zharko, Min-Hye Kim, Klaus Dehmelt, Senta Greene, Julia Velkovska, A. Khatiwada, D. Kawall, M. Rosati, Tamás Csörgő, M. L. Brooks, S. Park, J. Murata, Zvi Hirsh Citron, I. Shein, G. David, L. Patel, B. Fadem, E. O'Brien, K. Sedgwick, T. C. Awes, Mihael Makek, Jiangyong Jia, Y. Goto, D. Kleinjan, S. Campbell, D. Firak, R. A. Soltz, M. Grosse Perdekamp, F. Giordano, Alexei Khanzadeev, T. Hachiya, L. Bichon, J. B. Choi, Z. Ji, D. Yu Peressounko, Dipak Kumar Mishra, D. H. Kim, R. Akimoto, N. Apadula, C. Pinkenburg, A. Drees, T. V. Moukhanova, Z. Sun, S. Tarafdar, M. Leitgab, Motoi Inaba, A. Sen, V. S. Pantuev, S. Bathe, M. Chiu, M. Sarsour, C. A. Ogilvie, Mate Csanad, A. Iordanova, S. Y. Han, T. K. Hemmick, Yasuo Miake, K. DeBlasio, M. Nihashi, R. Pinson, Byung-Sik Hong, A. Bazilevsky, P. Montuenga, N. Novitzky, R. P. Pisani, V. Borisov, N. Grau, U. Acharya, M. McCumber, Iu. Mitrankov, H. En'yo, Alexandre Lebedev, M. J. Leitch, N. Ramasubramanian, X. Jiang, Xiao-yan Li, J. Hanks, Hiroyuki Sako, Norio Saito, D. Larionova, and V. Babintsev

Subjects
Quantum chromodynamics, Physics, Range (particle radiation), 010308 nuclear & particles physics, Nuclear Theory, Polarization (waves), 01 natural sciences, 7. Clean energy, Nuclear physics, Cross section (physics), 0103 physical sciences, Transverse momentum, Rapidity, Nuclear Experiment, 010306 general physics, Spin-½
Abstract

The PHENIX experiment has measured the spin alignment for inclusive J/ψ→e+e- decays in proton-proton collisions at s=510 GeV at midrapidity. The angular distributions have been measured in three different polarization frames, and the three decay angular coefficients have been extracted in a full two-dimensional analysis. Previously, PHENIX saw large longitudinal net polarization at forward rapidity at the same collision energy. This analysis at midrapidity, complementary to the previous PHENIX results, sees no sizable polarization in the measured transverse momentum range of 0.0

Published
2020

40. Spin Density Matrix Elements in Exclusive $\omega$ Meson Muoproduction $^*$

Author

Johannes Bernhard, Ch. Dreisbach, A. Guskov, W.-D. Nowak, C. Quintans, G. Nukazuka, Marcin Stolarski, D. D'Ago, C. Naim, F. Tosello, Pietro Faccioli, P.D. Eversheim, H. Suzuki, C.D.R. Azevedo, A. Srnka, G.V. Meshcheryakov, Yu. V. Mikhailov, Andrea Ferrero, G. D. Alexeev, Franco Bradamante, M. Faessler, P. Jörg, Arseniy Rybnikov, B. Badelek, Norihiro Doshita, N. d'Hose, B.M. Veit, O.P. Gavrichtchouk, Martin Bodlak, B. Ketzer, S. Gerassimov, N. Horikawa, Jen-Chieh Peng, J. Smolik, S.S. Dasgupta, R. Heitz, L. Sinha, O. Subrt, K. Zaremba, H. Schmieden, E. M. Kabuß, S.A. Mamon, T. Matsuda, A. Townsend, J.M. Friedrich, V.A. Polyakov, Y. Miyachi, A. Gridin, D.I. Ryabchikov, S. Sarkar, A.B. Ivanov, V.E. Burtsev, S. Huber, N. Mitrofanov, S. Tessaro, Yakov Petrovich Kulinich, G. Sbrizzai, Alexandr Selyunin, Yuxiang Zhao, A. Vauth, M. Wagner, Alessandro Bressan, D. von Harrach, F. Krinner, E. Zemlyanichkina, M.G. Alexeev, A. Amoroso, Yu.A. Khokhlov, J. Pochodzalla, S. Uhl, O.Yu. Denisov, J. Giarra, D. Neyret, Andres Cicuttin, A. Moretti, V.D. Samoylenko, C. Regali, I.A. Savin, Nour Makke, A. Sandacz, J. Nový, M. Chiosso, Naomi C R Makins, Yu. Kisselev, T. Iwata, R. Joosten, G. Reicherz, A. Maltsev, W. C. Chang, F. Gautheron, A. Vidon, B. Marianski, J. Barth, J.F.C.A. Veloso, A. Rychter, M. Finger, Bakur Parsamyan, J.H. Koivuniemi, K. Kurek, V.N. Kolosov, C. Chatterjee, M. Gorzellik, M. Ostrick, I. Denisenko, S. Dalla Torre, Gerhard K. Mallot, Y.-S. Lian, R. Beck, A. Kerbizi, A. Magnon, M. Quaresma, M. Slunečka, M. Pešková, M. Meyer, M. V. Zavertyaev, O.M. Kouznetsov, Anne-Laure Martin, C.-Y. Hsieh, V. Frolov, H. Pekeler, M. Virius, A.G. Chumakov, Miroslav Sulc, Antonin Kveton, D.V. Peshekhonov, W. Augustyniak, Aram Kotzinian, S. Platchkov, P. Zavada, M. Ziembicki, C. Franco, F. Tessarotto, Soumen Paul, R.P. Kurjata, B.I. Vasilishin, Jan Tomsa, M. Grosse Perdekamp, P.M.M. Correia, I. Konorov, P. Sznajder, J. Pretz, A. Antoshkin, M. Jandek, V.F. Konstantinov, W. Meyer, Maria Liz Crespo, F. Kaspar, D. Steffen, K. Lavickova, A. Grasso, V. Andrieux, A.V. Efremov, I. Gnesi, S. Wallner, Y. Bedfer, R. Longo, Kamil Augsten, V. Jary, S. Ishimoto, H. Fischer, A. Thiel, Valery E. Lyubovitskij, A.G. Olshevsky, G.V. Khaustov, A. Maggiora, S. Levorato, S. Dasgupta, Frank Klein, Jan Matousek, Mikhail Mikhasenko, S. V. Donskov, M. Pešek, F. Kunne, Markus Ball, R.R. Dusaev, V. Tskhay, A.S. Nunes, D. Panzieri, Janusz Marzec, E. Mitrofanov, T. Szameitat, A. Koval, J. Lichtenstadt, B. Ventura, B. Grube, M. Zemko, S.-U. Chung, François Herrmann, P.-J. Lin, K. Kondo Horikawa, G. Mattson, V. Anosov, Z. Kral, J. Berenguer Antequera, W. Dünnweber, A. Nagaytsev, F. Balestra, N. Pierre, T. Rudnicki, C. Riedl, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, COMPASS, Alexeev, G. D., Alexeev, M. G., Amoroso, A., Andrieux, V., Anosov, V., Antoshkin, A., Augsten, K., Augustyniak, W., Azevedo, C. D. R., Badełek, B., Balestra, F., Ball, M., Barth, J., Beck, R., Bedfer, Y., Antequera, J. Berenguer, Bernhard, J., Bodlak, M., Bradamante, F., Bressan, A., Burtsev, V. E., Chang, W. -C., Chatterjee, C., Chiosso, M., Chumakov, A. G., Chung, S. -U., Cicuttin, A., Correia, P. M. M., Crespo, M. L., D’Ago, D., Torre, S. Dalla, Dasgupta, S. S., Dasgupta, S., Denisenko, I., Denisov, O. Yu., Donskov, S. V., Doshita, N., Dreisbach, Ch., Dünnweber, W., Dusaev, R. R., Efremov, A., Eversheim, P. D., Faccioli, P., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., Friedrich, J. M., Frolov, V., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Gnesi, I., Gorzellik, M., Grasso, A., Gridin, A., Perdekamp, M. Grosse, Grube, B., Guskov, A., von Harrach, D., Heitz, R., Herrmann, F., Horikawa, N., D’Hose, N., Hsieh, C. -Y., Huber, S., Ishimoto, S., Ivanov, A., Iwata, T., Jandek, M., Jary, V., Jörg, P., Joosten, R., Kabuß, E., Kaspar, F., Kerbizi, A., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Koivuniemi, J. H., Kolosov, V. N., Horikawa, K. Kondo, Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Koval, A., Kral, Z., Krinner, F., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Kveton, A., Lavickova, K., Levorato, S., Lian, Y. -S., Lichtenstadt, J., Lin, P. -J., Longo, R., Lyubovitskij, V. E., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Maltsev, A., Mamon, S. A., Marianski, B., Martin, A., Marzec, J., Matoušek, J., Matsuda, T., Mattson, G., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Yu. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Moretti, A., Nagaytsev, A., Naim, C., Neyret, D., Nový, J., Nowak, W. -D., Nukazuka, G., Nunes, A. S., Olshevsky, A. G., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Pekeler, H., Peng, J. -C., Pešek, M., Peshekhonov, D. V., Pešková, M., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Regali, C., Reicherz, G., Riedl, C., Rudnicki, T., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sbrizzai, G., Schmieden, H., Selyunin, A., Sinha, L., Slunecka, M., Smolik, J., Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Szameitat, T., Sznajder, P., Tessaro, S., Tessarotto, F., Thiel, A., Tomsa, J., Tosello, F., Townsend, A., Tskhay, V., Uhl, S., Vasilishin, B. I., Vauth, A., Veit, B. M., Veloso, J., Ventura, B., Vidon, A., Virius, M., Wagner, M., Wallner, S., Zaremba, K., Zavada, P., Zavertyaev, M., Zemko, M., Zemlyanichkina, E., Zhao, Y., and Ziembicki, M.

Subjects
virtual [photon], generalized parton distribution, Physics and Astronomy (miscellaneous), Hadron, parton: distribution function, Virtual particle, Parton, SDME, COMPASS, 01 natural sciences, Omega, High Energy Physics - Experiment, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], spin: density matrix, Nuclear Experiment, Quantum chromodynamics, Physics, density matrix [spin], vector meson, helicity: conservation law, Helicity, kinematics, omega(783): production, Production (computer science), distribution function [parton], Particle Physics - Experiment, exclusive reaction, Particle physics, liquid: target [hydrogen], Meson, polarization: longitudinal, lcsh:Astrophysics, +muon+p+omega%28783%29%22">muon p --> muon p omega(783), transverse momentum, meson, hydrogen: liquid: target, lcsh:QB460-466, 0103 physical sciences, polarization: transverse, ddc:530, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, Engineering (miscellaneous), DIS, background, muon: beam, 010308 nuclear & particles physics, hep-ex, High Energy Physics::Phenomenology, conservation law [helicity], Automatic Keywords, lcsh:QC770-798, High Energy Physics::Experiment, experimental results, photon: virtual
Abstract

We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $\omega$ meson muoproduction on the proton at COMPASS using 160 GeV/$c$ polarised $ \mu ^{+}$ and $ \mu ^{-}$ beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/$c^2$ $< W, Comment: 31 pages, 12 figures, 1 appendix

Published
2020

41. Measurement of charged pion double spin asymmetries at midrapidity in longitudinally polarized p+p collisions at s=510 GeV

Author

Alice Mignerey, S. Miyasaka, Roli Esha, Shoichi Hasegawa, Pawan Kumar Netrakanti, Anne Marie Sickles, X. Sun, B. Meredith, Takao Sakaguchi, Y. Imazu, Shota Suzuki, Alexei Khanzadeev, J. S. Bok, A. Sen, N. Feege, S. Ishimaru, D. Lynch, A. D. Frawley, S. Huang, E. Kistenev, H. A. Torii, B. Kurgyis, Toru Sugitate, J. Sun, Mate Csanad, Sándor Lökös, K. N. Barish, N. N. Ajitanand, T. O. S. Haseler, M. Kurosawa, S. Zharko, J. H. Yoo, M. Slunečka, P. L. McGaughey, G. D. N. Perera, K. B. Lee, X. He, M. Potekhin, Y. Aramaki, M. L. Brooks, J. Koster, E. Joo, A. Mwai, Maya Hachiya Shimomura, Vardan Khachatryan, J. Bryslawskyj, S. Nelson, B. Azmoun, M. Nihashi, Hideki Hamagaki, W. Fan, M. Vargyas, R. A. Soltz, G. David, T. Todoroki, K. I. Hahn, H. Nakagomi, T. Hoshino, Y. I. Makdisi, M. Rosati, C. L. Silva, D. H. Kim, T. V. Moukhanova, Hari Guragain, S. Beckman, E. Mannel, I. Tserruya, A. Deshpande, A. Sexton, W. J. Metzger, R. Seto, M. Jezghani, S. Bathe, T. W. Danley, V. S. Pantuev, K. Kihara, Tamás Csörgő, Qiao Xu, B. Mulilo, A. Durum, S. Tarafdar, L. Ding, E. J. Desmond, B. Fadem, I. J. Choi, B. Xia, M. Kofarago, D. Roach, Viktor Riabov, J. M. Durham, V. Singh, A. Hodges, Yoshifumi Ueda, J. H. Do, R. P. Pisani, P. Kline, M. Towell, D. Silvermyr, Susumu Sato, A. Dion, A. Pun, H. Asano, Jan Rak, L. Zou, R. Lacey, M. J. Tannenbaum, Ajeeta Khatiwada, T. Koblesky, D. Kawall, U. Acharya, Kensuke Homma, A. Meles, Yongsun Kim, W. Peng, V. Bumazhnov, T. Murakami, A. Yanovich, Timothy Thomas Rinn, H. J. Kim, K. Tanida, M. I. Nagy, Kimberly Hill, M. Sarsour, Z. Rowan, P. W. Stankus, J. Hanks, M. Mendoza, Xingguo Li, S. P. Whitaker, C. L. Woody, D. Watanabe, D. Black, B. K. Schmoll, E. Vznuzdaev, R. Nishitani, C. P. Singh, Jiangyong Jia, Zvi Hirsh Citron, A. Berdnikov, Martin Purschke, C. A. Aidala, D. E. Fields, Y. Goto, M. Patel, N. Ramasubramanian, Minghui Liu, B. M. Johnson, H. Ge, K. Nakano, Y. H. Leung, H. Sako, I. Shein, W. E. Sondheim, A. Glenn, P. V. Radzevich, S. P. Sorensen, I. E. Yushmanov, Eunja Kim, H. En'yo, K. Sedgwick, M. McCumber, Mihael Makek, K. Boyle, M. J. Leitch, D. Kleinjan, N. Riveli, Min-Hye Kim, P. Montuenga, X. Jiang, C. Y. Scarlett, M. Beaumier, J. Sziklai, Kenneth Francis Read, E. A. Gamez, K. S. Joo, J. G. Lajoie, I. Younus, Alexander Milov, I. Nakagawa, Serpil Yalcin, R. S. Towell, D. K. Mishra, J. G. Rubin, M. Alfred, T. Hachiya, Y. Watanabe, N. Apadula, Barbara Jacak, N. Novitzky, Jennifer E. Perry, Iu. Mitrankov, F. Wei, K. L. Smith, C. P. Wong, R. Petti, N. S. Bandara, Y. J. Kwon, Y. Gu, A. J. Miller, A. Iordanova, J. Murata, N. Grau, Vladimir Samsonov, D. P. Morrison, Petr Gallus, S. Campbell, S. Esumi, D. Sharma, W. A. Zajc, L. Xue, A. Sukhanov, K. Kurita, Christine Nattrass, J. T. Mitchell, M. Leitgab, Shuo Han, A. Denisov, Yuki Watanabe, Agneta Oskarsson, S. I. Morrow, Tatsuya Chujo, K. Dehmelt, Animesh Datta, T. Sumita, A. Taranenko, C. O. Kim, R. Pak, C. Y. Chi, Motoi Inaba, J. C. Hill, E. T. Atomssa, Sergey Fokin, Jen-Chieh Peng, A. V. Kazantsev, J. S. Kang, S. J. Jeon, Yanjun Wu, Balazs Ujvari, C. Gal, Y. Zhai, D. Reynolds, Julia Velkovska, R. Seidl, D. Kincses, Vladislav Manko, J. L. Nagle, Xiong Wang, S. Sawada, A. Franz, J. Runchey, T. Majoros, M. S. Daugherity, Dong Jo Kim, K. Imai, Y. Berdnikov, I. V. Sourikova, Ferdinando Giordano, S. H. Lee, Y. Akiba, C. McKinney, M. Tomášek, Brennan Schaefer, S. Nagamiya, L. Patel, A. Timilsina, T. C. Awes, Kyoichiro Ozawa, Byung-Sik Hong, A. Bazilevsky, Vaclav Vrba, J. Huang, H. W. Yu, J. Seele, Prakhar Garg, M. Wysocki, B. Bannier, N. A. Lewis, Norio Saito, Prashant Shukla, S. H. Lim, S. F. Pate, Henner Buesching, V. Babintsev, J. A. Key, D. Ivanishchev, Y. Riabov, V. Papavassiliou, C. E. Perezlara, Kenta Shigaki, A. S. Nyanin, C. A. Ogilvie, Rachid Nouicer, T. K. Hemmick, Bhawani Singh, A. N. Zelenski, Y. L. Yamaguchi, Yasuo Miake, S. Mizuno, K. DeBlasio, R. Pinson, Don McGlinchey, S. Wolin, A. Drees, D. Kotov, S. P. Stoll, D. Jouan, Atsushi Takahara, K. A. Drees, J. Klatsky, J. B. Choi, R. S. Hollis, G. Mitsuka, A. Adare, J. E. Frantz, A. Enokizono, A. Taketani, Priyanka Sett, D. S. Jumper, Z. Sun, T. Niida, M. Chiu, T. A. Shibata, A. Lebedev, I. Ravinovich, D. Isenhower, Tamas Novak, T. Moon, R. Belmont, Senta Greene, M. Bai, E. O'Brien, H. Van Hecke, M. Grosse Perdekamp, Y. Ikeda, M. E. Connors, S. K. Park, Taku Gunji, R. Akimoto, Z. Ji, D. Yu Peressounko, Dennis Perepelitsa, C. Pinkenburg, J. D. Osborn, Inseok Yoon, Zirui Wang, M. Finger, M. Stepanov, J. H. Kang, J. S. Haggerty, M. Virius, J. D. Orjuela Koop, C. H. Chen, A. Manion, S. D. Rolnick, Dillon Scott Fitzgerald, Kei Nagashima, V. Canoa Roman, Raphael Noel Tieulent, and D. Richford

Subjects
Quantum chromodynamics, Physics, 010308 nuclear & particles physics, Scattering, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, Parton, Deep inelastic scattering, 7. Clean energy, 01 natural sciences, Gluon, Nuclear physics, Pion, 0103 physical sciences, Proton spin crisis, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

The PHENIX experiment at the Relativistic Heavy Ion Collider has measured the longitudinal double spin asymmetries, $A_{LL}$, for charged pions at midrapidity ($|\eta

Published
2020

42. Erratum: Evolution of π0 Suppression in Au+Au Collisions from sNN=39 to 200 GeV [Phys. Rev. Lett. 109 , 152301 (2012)]

Author

X. Jiang, H. Pei, S. Taneja, K. Karatsu, H. J. Kim, Y. Hori, Anne Marie Sickles, H. Themann, K. Gainey, M. S. Daugherity, Y. L. Yamaguchi, Y. Komatsu, Mate Csanad, I. Ravinovich, Marisilvia Donadelli, V. Bumazhnov, M. Nihashi, B. Komkov, K. B. Lee, I. Younus, Peter Christiansen, N. N. Ajitanand, X. He, Y. Aramaki, V. Peresedov, Robert Vertesi, K. S. Sim, J. Koster, M. Bai, E. C. Aschenauer, Barbara Jacak, L. Ding, T. Kempel, Takahiro Nakamura, Alice Mignerey, L. D'Orazio, R. P. Pisani, R. Yang, Vladimir Samsonov, Norio Saito, Tsutomu Mibe, M. A. L. Leite, S. H. Lim, E. J. Desmond, D. Roach, K. M. Kijima, S. Bathe, Kensuke Homma, E. Richardson, Y. Tanaka, E. Mannel, Hiromi Iinuma, Senta Greene, A. Durum, S. Miyasaka, A. Ster, Christine Nattrass, J. S. Kapustinsky, V. Babintsev, M. Javani, L. Guo, Alexei Khanzadeev, Y. J. Kwon, C. P. Singh, Zhiying You, Agneta Oskarsson, B. Azmoun, Y. Berdnikov, S. H. Lee, Y. Akiba, M. Finger, K. Hashimoto, K. O. Eyser, Tomoya Tsuji, S. Dairaku, M. Tomášek, G. S. Kyle, B. Bassalleck, H. Qu, H. J. Moon, E. O'Brien, B. M. Johnson, Filip Krizek, Takao Sakaguchi, A. Sen, A. D. Frawley, S. V. Afanasiev, Yu. Efremenko, J. H. Kang, Y. Miyachi, J. S. Haggerty, S. R. Lee, Shinichi Masumoto, E. Stenlund, S. Huang, Aaron Angerami, J. S. Kang, R. A. Soltz, Tomofumi Nagae, R. Lacey, J. L. Nagle, P. Castera, M. Mendoza, S. N. White, Hideki Hamagaki, K. Aoki, M. Vargyas, G. David, T. Todoroki, K. I. Hahn, A. Isupov, M. Virius, S. Choi, C. L. Silva, Y. Nakamiya, Byung-Sik Hong, A. Bazilevsky, J. Sziklai, C. McKinney, S. Nagamiya, A. Taranenko, Atsushi Takahara, Y. Fukao, Vaclav Vrba, R. Granier de Cassagnac, W. A. Zajc, J. Sun, A. Adare, Charles Maguire, M. Gonin, M. Grosse Perdekamp, Brian Cole, E. Kistenev, D. E. Fields, D. M. Lee, R. S. Towell, T. Horaguchi, K. A. Drees, V. Baublis, O. Dietzsch, J. M. Durham, T. Hester, V. S. Pantuev, A. Denisov, Yuki Watanabe, M. Sano, V. Cianciolo, M. E. Connors, C. H. Chen, K. Watanabe, S. K. Park, K. Shoji, I. Garishvili, F. Wei, S. Baumgart, Y. S. Lai, M. McCumber, Maya Hachiya Shimomura, J. Rak, E. T. Atomssa, Rui Wei, A. Manion, Sergey Fokin, J. Klatsky, Yongsun Kim, T. V. Moukhanova, P. W. Stankus, S. Tarafdar, A. Sukhanov, D. Kawall, K. Kurita, Dmitry Blau, H. Pereira, K. Nakano, K. B. Kim, W. E. Sondheim, P. Kline, J. T. Mitchell, K. S. Lee, J. E. Frantz, D. Ivanischev, Minghui Liu, Ryugo S. Hayano, H. Asano, J. B. Choi, C. Gal, Julia Velkovska, K. Tanida, Jongmin Lee, M. Proissl, D. Winter, D. Yu Peressounko, Eva Haslum, K. Okada, Animesh Datta, J. Hanks, C. Y. Chi, A. Lebedev, A. Dion, J. Imrek, R. Seidl, Y. I. Makdisi, Vladislav Manko, M. Rosati, Tamás Csörgő, E. Vazquez-Zambrano, Kenneth Francis Read, J. Alexander, A. Nederlof, A. Enokizono, Beomkyu Kim, K. Boyle, P. A. Rukoyatkin, B. Sahlmueller, Zvi Hirsh Citron, T. Ichihara, H. A. Gustafsson, Gerd Joachim Kunde, M. Kurosawa, M. J. Leitch, C. O. Kim, A. Deshpande, A. Taketani, R. Belmont, S. Yokkaichi, Y. Riabov, C. A. Ogilvie, R. S. Hollis, M. Kasai, B. Meredith, R. Pak, Y. Tsuchimoto, T. K. Hemmick, Bhawani Singh, Kenta Shigaki, Yasuo Miake, I. Shein, B. Lewis, I. J. Choi, A. Kiss, H. Van Hecke, C. Vale, Jiangyong Jia, Henner Buesching, Y. Goto, Steve Edwards, Y. Ikeda, M. J. Tannenbaum, N. Grau, I. E. Yushmanov, M. Leitgab, K. Sedgwick, H. A. Torii, M. Slunečka, Mihael Makek, S. Kaneti, S. P. Sorensen, Toru Sugitate, Viktor Riabov, K. S. Joo, D. K. Mishra, D. Kleinjan, P. L. McGaughey, Motoi Inaba, J. C. Hill, X. Gong, R. Akimoto, K. V. Dharmawardane, A. S. Nyanin, François Fleuret, Jason Kamin, M. I. Nagy, A. V. Kazantsev, X. Bing, O. Chvala, E. Tennant, N. Apadula, Y. Watanabe, Takahiro Fusayasu, Rachid Nouicer, D. Watanabe, L. A. Linden Levy, A. N. Zelenski, C. Pinkenburg, L. Tomášek, Alexander Malakhov, M. Stepanov, G. Roche, A. Vossen, R. Petti, D. Silvermyr, E. Vznuzdaev, L. S. Zolin, M. Chiu, Ajit Kumar Mohanty, T. A. Shibata, L. Patel, A. Yanovich, S. Esumi, A. Iordanova, T. C. Awes, Kyoichiro Ozawa, D. Sharma, J. G. Lajoie, M. Soumya, T. Hachiya, J. Murata, Martin Purschke, C. A. Aidala, C. L. Woody, A. Berdnikov, D. Kotchetkov, R. K. Choudhury, A. Garishvili, I. V. Sourikova, D. Isenhower, M. Ouchida, Taku Gunji, S. Butsyk, S. D. Rolnick, Prashant Shukla, S. F. Pate, Ke. Nakamura, S. Motschwiller, V. Papavassiliou, A. Král, Alexander Milov, I. Nakagawa, Young-Ki Kim, T. Engelmore, N. Novitzky, O. Drapier, B. Love, A. G. Litvinenko, Bum-Hoon Lee, E. R. Kinney, D. P. Morrison, S. Campbell, B. H. Kang, R. Seto, M. Wysocki, B. Bannier, B. Fadem, H. Al-Ta'Ani, Tatsuya Chujo, T. Murakami, E. M. Takagui, M. Issah, I. Tserruya, K. N. Barish, Don McGlinchey, M. L. Brooks, V. Singh, D. Kotov, S. Sawada, J. Ying, A. Franz, M. Sarsour, R. Reynolds, S. P. Stoll, A. Glenn, Eunja Kim, Jen-Chieh Peng, D. Jouan, S. Wolin, Inkyu Park, Xiong Wang, Byoungchoo Park, Dong Jo Kim, A. Drees, and A. Veicht

Subjects
Nuclear physics, Physics, Published Erratum, General Physics and Astronomy
Published
2020

43. Measurement of J/ψ at forward and backward rapidity in p+p , p+Al , p+Au , and He3+Au collisions at sNN=200 GeV

Author

J. B. Choi, D. Fitzgerald, Dipak Kumar Mishra, S. Karthas, D. Kotov, C. L. Woody, A. Berdnikov, A. Sukhanov, K. Kurita, Y. H. Leung, T. V. Moukhanova, D. S. Jumper, L. Zou, N. S. Bandara, M. Stepanov, Vladimir Samsonov, Christine Nattrass, R. Pak, M. Csanad, S. P. Stoll, T. Todoroki, R. Kitamura, D. Jouan, Petr Gallus, Min-Hye Kim, Hari Guragain, S. H. Lee, C. Y. Scarlett, P. Sett, T. Nagashima, K. Ozawa, I. V. Sourikova, Minghui Liu, S. Hasegawa, H. Asano, Z. Rowan, Kenneth Francis Read, J. L. Nagle, S. Bathe, M. Chiu, C. A. Ogilvie, S. Nelson, T. K. Hemmick, A. Sen, B. J. Ramson, V. S. Pantuev, K. DeBlasio, R. Pinson, Keiji Nagai, M. Mendoza, N. Apadula, A. Drees, S. Suzuki, A. Deshpande, H. Yamamoto, N. Feege, E. A. Gamez, R. S. Towell, D. Lynch, A. Meles, Takafumi Niida, J. Huang, H. Ge, B. Azmoun, K. Nakano, A. Pun, B. Kimelman, B. M. Johnson, Dmitry Blau, V. Bumazhnov, A. V. Kazantsev, W. E. Sondheim, K. Hashimoto, Prakhar Garg, K. Boyle, D. V. Perepelitsa, Xingguo Li, B. Komkov, Alice Mignerey, B. Bannier, Y. Watanabe, D. E. Fields, E. J. Desmond, S. P. Sorensen, S. Miyasaka, H. En'yo, T. Shioya, Norio Saito, M. J. Leitch, H. Yu, Y. Fukuda, B. V. Jacak, A. Enokizono, D. Dixit, Motoi Inaba, Animesh Datta, T. Sumita, C. Y. Chi, Prashant Shukla, John Hill, B. Sahlmueller, B. Kurgyis, S. F. Pate, Toru Sugitate, G. David, Kiyoshi Tanida, Jan Rak, S. H. Lim, X. Sun, Agneta Oskarsson, Takao Sakaguchi, A. Taranenko, R. Lacey, Brajesh K. Singh, G. J. Ottino, M. Potekhin, J. G. Lajoie, M. Alfred, Y. Riabov, E. Kistenev, D. Kincses, John Matthew Durham, V. R. Loggins, J. T. Mitchell, J. Bryslawskyj, Kenta Shigaki, J. A. Key, N. Hotvedt, R. Seidl, Michael William Phipps, S. Lee, Jennifer E. Perry, M. S. Daugherity, R. Cervantes, A. Iordanova, Y. Berdnikov, S. Y. Han, Y. Akiba, S. Ishimaru, V. Babintsev, C. McKinney, C. P. Singh, Vladislav Manko, Viktor Riabov, Serpil Yalcin, A. Adare, Balazs Ujvari, Y. J. Kwon, A. D. Frawley, A. S. Nyanin, R. Nishitani, M. Slunečka, M. Snowball, H. Nakagomi, T. Hoshino, N. A. Lewis, Rachid Nouicer, A. N. Zelenski, Vaclav Vrba, K. Hill, R. J. Petti, D. Ivanishchev, J. Sun, I. E. Yushmanov, A. S. White, V. Papavassiliou, C. E. Perezlara, P. L. McGaughey, Z. Wang, Byung-Sik Hong, T. Murakami, Chong Kim, A. Bazilevsky, N. N. Ajitanand, D. E. Mihalik, S. Huang, J. Sziklai, C. P. Wong, D. Richford, A. S. Safonov, M. Connors, I. J. Choi, B. Xia, W. A. Zajc, Wesley James Metzger, D. McGlinchey, S. Beckman, Yoshifumi Ueda, J. H. Do, G. D. N. Perera, Qiao Xu, ShinIchi Esumi, D. Silvermyr, L. Xue, P. Kline, A. Dion, M. Kurosawa, Alexandre Lebedev, C. L. Towell, N. Vukman, N. Novitzky, A. Denisov, Yuki Watanabe, Y. Zhai, J. H. Yoo, A. Timilsina, R. Belmont, D. Kawall, Shunji Nishimura, S. I. Morrow, K. A. Drees, A. Durum, R. P. Pisani, H. F. Hamilton, Maya Hachiya Shimomura, R. S. Hollis, S. Mizuno, Y. I. Makdisi, A. Franz, J. Runchey, A. Yanovich, N. Ramasubramanian, H. W. Van Hecke, U. Acharya, M. McCumber, Sergey Fokin, X. Jiang, J. Murata, Zvi Hirsh Citron, Kensuke Homma, I. Shein, C. L. Silva, J. Klatsky, M. Beaumier, M. J. Tannenbaum, K. Sedgwick, T. Novák, Mihael Makek, J. Hanks, Hiroyuki Sako, B. K. Schmoll, T. Majoros, D. Sharma, Anne Marie Sickles, B. Schaefer, J. S. Bok, Martin Purschke, C. A. Aidala, M. J. Skoby, Pawan Kumar Netrakanti, V. Andrieux, V. Khachatryan, M. I. Nagy, D. Kapukchyan, G. Mitsuka, A. Taketani, K. Lovasz, J. H. Kang, M. Rosati, J. S. Haggerty, Tamás Csörgő, S. Kudo, Jiangyong Jia, Y. Goto, D. Kleinjan, S. Campbell, K. L. Smith, Senta Greene, M. Virius, Yanjun Wu, E. J. Mannel, T. Rinn, C. Gal, B. Fadem, E. O'Brien, Klaus Dehmelt, Julia Velkovska, A. Khatiwada, R. A. Soltz, M. Grosse Perdekamp, F. Giordano, J. D. Orjuela Koop, T. Hachiya, S. K. Park, C. H. Chen, C. Pinkenburg, A. Manion, I. Ravinovich, Z. Ji, D. Yu Peressounko, G. Tarnai, Z. Sun, M. Bai, S. Tarafdar, J. D. Osborn, Inseok Yoon, Kei Nagashima, M. Finger, V. Canoa Roman, G. W. Kim, Raphael Noel Tieulent, Susumu Sato, Jong-Min Park, Taku Gunji, B. Mulilo, M. Patel, N. Cronin, M. Tomášek, S. Kanda, W. Peng, P. W. Stankus, S. Zhou, R. Esha, P. Montuenga, S. D. Rolnick, N. Grau, Iu. Mitrankov, Ajit Kumar Mohanty, T. A. Shibata, Kenichi Imai, T. O. S. Haseler, D. Isenhower, T. Moon, P. B. Diss, Hideki Hamagaki, W. Fan, K. I. Hahn, Alexander Milov, I. Nakagawa, D. P. Morrison, M. Boer, Sándor Lökös, K. N. Barish, Tatsuya Chujo, I. Tserruya, M. Jezghani, V. Singh, A. Hodges, S. Zharko, T. Koblesky, M. Sarsour, F. Wei, A. Glenn, P. V. Radzevich, Eunja Kim, M. L. Brooks, Jen-Chieh Peng, J. G. Rubin, X. He, J. E. Frantz, D. Reynolds, Xiong Wang, Dong Jo Kim, M. Wysocki, A. Mwai, Y. L. Yamaguchi, C. Xu, A. Sexton, R. Seto, T. W. Danley, and Alexei Khanzadeev

Subjects
Physics, 010308 nuclear & particles physics, Projectile, Nuclear Theory, Observable, Nuclear matter, Collision, 7. Clean energy, 01 natural sciences, Nuclear physics, Yield (chemistry), 0103 physical sciences, Quark–gluon plasma, High Energy Physics::Experiment, Rapidity, Impact parameter, Nuclear Experiment, 010306 general physics
Abstract

Charmonium is a valuable probe in heavy-ion collisions to study the properties of the quark gluon plasma, and is also an interesting probe in small collision systems to study cold nuclear matter effects, which are also present in large collision systems. With the recent observations of collective behavior of produced particles in small system collisions, measurements of the modification of charmonium in small systems have become increasingly relevant. We present the results of J/ψ measurements at forward and backward rapidity in various small collision systems, p+p, p+Al, p+Au, and He3+Au, at sNN=200 GeV. The results are presented in the form of the observable RAB, the nuclear modification factor, a measure of the ratio of the J/ψ invariant yield compared to the scaled yield in p+p collisions. We examine the rapidity, transverse momentum, and collision centrality dependence of nuclear effects on J/ψ production with different projectile sizes p and He3, and different target sizes Al and Au. The modification is found to be strongly dependent on the target size, but to be very similar for p+Au and He3+Au. However, for 0%–20% central collisions at backward rapidity, the modification factor for He3+Au is found to be smaller than that for p+Au, with a mean fit to the ratio of 0.89±0.03(stat)±0.08(syst), possibly indicating final state effects due to the larger projectile size.

Published
2020

44. Nuclear-modification factor of charged hadrons at forward and backward rapidity in p + Al and p + Au collisions at sNN=200GeV

Author

Alice Mignerey, T. Hoshino, S. Miyasaka, Martin Purschke, C. A. Aidala, I. Tserruya, W. J. Metzger, D. Richford, A. S. Safonov, Motoi Inaba, Takao Sakaguchi, M. Jezghani, V. Singh, A. Hodges, N. Apadula, A. Drees, S. Ishimaru, A. D. Frawley, R. A. Soltz, P. Montuenga, N. Grau, A. Sen, S. Huang, V. S. Pantuev, Iu. Mitrankov, M. Snowball, H. F. Hamilton, T. Koblesky, Yoshifumi Ueda, J. H. Do, M. Sarsour, C. L. Towell, N. Vukman, Maya Hachiya Shimomura, R. S. Hollis, Mate Csanad, A. Iordanova, S. Y. Han, M. Slunečka, P. L. McGaughey, M. J. Skoby, M. Grosse Perdekamp, F. Giordano, T. Hachiya, I. J. Choi, Y. I. Makdisi, Min-Hye Kim, S. H. Lee, C. Y. Scarlett, S. Karthas, D. Kawall, D. Kotov, John Hill, D. McGlinchey, V. Andrieux, V. Khachatryan, S. Park, H. En'yo, B. Kurgyis, N. Novitzky, M. J. Tannenbaum, D. S. Jumper, Toru Sugitate, B. K. Schmoll, P. V. Radzevich, Z. Ji, A. V. Kazantsev, Arkadiy Taranenko, S. P. Stoll, K. A. Drees, R. P. Pisani, D. Yu Peressounko, M. J. Leitch, Dennis Perepelitsa, I. Shein, M. McCumber, Eunja Kim, J. Murata, Alexander Milov, K. Sedgwick, M. Beaumier, R. Nishitani, S. Nelson, Mihael Makek, A. Deshpande, S. Suzuki, H. Yamamoto, Z. Wang, Y. Fukuda, Alexei Khanzadeev, I. Nakagawa, Y. J. Kwon, K. L. Smith, G. David, J. Klatsky, Takafumi Niida, J. Huang, J. B. Choi, Viktor Riabov, Kensuke Homma, A. Khatiwada, Sándor Lökös, K. N. Barish, A. Enokizono, S. Esumi, D. Jouan, Y. H. Leung, Kiyoshi Tanida, Senta Greene, Kyoichiro Ozawa, Dipak Kumar Mishra, Qiao Xu, D. Silvermyr, D. P. Morrison, Y. Watanabe, E. Kistenev, S. Bathe, M. Chiu, Prakhar Garg, T. Murakami, T. Majoros, Y. Riabov, J. Bryslawskyj, Kenta Shigaki, R. Cervantes, L. Zou, V. Babintsev, Minghui Liu, Byung-Sik Hong, Chong Kim, A. Bazilevsky, S. H. Lim, C. A. Ogilvie, T. K. Hemmick, S. Zharko, D. Sharma, B. Fadem, E. O'Brien, B. Azmoun, Alexandre Lebedev, A. Yanovich, Kenneth Francis Read, A. Pun, Anne Marie Sickles, A. S. Nyanin, J. Sun, S. I. Morrow, D. Lynch, Serpil Yalcin, B. Schaefer, S. Mizuno, Rachid Nouicer, A. N. Zelenski, Y. Zhai, Z. Rowan, A. Franz, J. Runchey, K. DeBlasio, C. Gal, J. S. Bok, M. Mendoza, Dmitry Blau, J. E. Frantz, Klaus Dehmelt, D. Reynolds, Julia Velkovska, C. L. Silva, M. Rosati, C. P. Wong, Prashant Shukla, P. Kline, Keiji Nagai, A. Dion, X. Jiang, Tamás Csörgő, Xiong Wang, S. F. Pate, H. W. Van Hecke, Zvi Hirsh Citron, M. Connors, W. A. Zajc, L. Xue, E. J. Desmond, H. Ge, K. Nakano, S. Kudo, S. Hasegawa, S. P. Sorensen, A. Denisov, W. E. Sondheim, M. L. Brooks, Y. Goto, Xiao-yan Li, D. Ivanishchev, J. Hanks, V. Papavassiliou, Sergey Fokin, C. E. Perezlara, Hiroyuki Sako, X. He, V. R. Loggins, J. T. Mitchell, S. Campbell, N. Hotvedt, T. Shioya, J. G. Lajoie, R. Seidl, Vladislav Manko, C. L. Woody, M. Alfred, A. Berdnikov, Michael William Phipps, S. Lee, Jennifer E. Perry, Balazs Ujvari, Petr Gallus, T. Nagashima, D. Dixit, I. E. Yushmanov, Y. L. Yamaguchi, I. V. Sourikova, C. Xu, A. Timilsina, Agneta Oskarsson, A. Sexton, Kenichi Imai, D. Kincses, John Matthew Durham, A. Sukhanov, K. Kurita, T. O. S. Haseler, R. Seto, T. W. Danley, Y. Berdnikov, Y. Akiba, C. McKinney, Hideki Hamagaki, W. Fan, K. I. Hahn, Vaclav Vrba, K. Hill, N. Cronin, Jong-Min Park, Taku Gunji, M. Tomášek, W. Peng, P. W. Stankus, M. Patel, J. D. Osborn, Inseok Yoon, M. Finger, S. D. Rolnick, G. Mitsuka, M. I. Nagy, D. Kapukchyan, T. A. Shibata, G. D. N. Perera, D. Isenhower, Tamas Novak, T. Moon, A. Durum, D. E. Fields, B. V. Jacak, Hari Guragain, Kei Nagashima, V. Canoa Roman, Raphael Noel Tieulent, Susumu Sato, K. Lovasz, H. Asano, N. Feege, E. A. Gamez, M. Virius, J. D. Orjuela Koop, Brajesh K. Singh, G. J. Ottino, R. S. Towell, J. H. Kang, J. S. Haggerty, H. Yu, T. Sumita, C. Y. Chi, J. H. Yoo, R. Belmont, E. J. Mannel, T. Rinn, M. S. Daugherity, C. P. Singh, R. Petti, B. M. Johnson, N. A. Lewis, J. Sziklai, C. Pinkenburg, N. S. Bandara, Vladimir Samsonov, Christine Nattrass, G. Tarnai, T. Todoroki, Z. Sun, J. L. Nagle, S. Tarafdar, and V. Bumazhnov

Subjects
Physics, 010308 nuclear & particles physics, Hadron, Parton, Modification factor, 01 natural sciences, Nuclear physics, Distribution function, Pseudorapidity, 0103 physical sciences, Rapidity, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The PHENIX experiment has studied nuclear effects in p+Al and p+Au collisions at sNN=200GeV on charged hadron production at forward rapidity (1.4

Published
2020

45. J/ψ and ψ(2S) production at forward rapidity in p+p collisions at s=510 GeV

Author

E. Mannel, H. Nakagomi, T. Hoshino, D. H. Kim, W. J. Metzger, J. M. Durham, Yoshifumi Ueda, J. H. Do, M. Patel, Z. Sun, Alexei Khanzadeev, N. Ramasubramanian, A. D. Frawley, X. Jiang, W.A. Zajc, J. Huang, L. Zou, A. C. Mignerey, V. Bumazhnov, D. Black, S. Tarafdar, T. Sugitate, S. Huang, Prakhar Garg, J. Seele, J. S. Haggerty, A. Meles, M. Alfred, M. Wysocki, B. Bannier, M. Virius, W.E. Sondheim, M. Inaba, Tamás Csörgő, T-A Shibata, S. P. Whitaker, Jiangyong Jia, Y. Goto, S. F. Pate, E. J. Kim, E. Kistenev, S. L. Fokin, C. Kim, D. Kleinjan, M. S. Daugherity, K. L. Smith, R. Lacey, K. Dehmelt, S. Park, Ferdinando Giordano, J. H. Kang, V. S. Pantuev, M. Kim, Kenneth Francis Read, E. T. Atomssa, Yanjun Wu, C. Gal, A. Adare, B. V. Jacak, M. McCumber, Julia Velkovska, R. Nishitani, N. Feege, P. L. McGaughey, Bhartendu K. Singh, M. Tomášek, E. A. Gamez, S. P. Stoll, I. Shein, Jen-Chieh Peng, R. Petti, Ajeeta Khatiwada, A. J. Miller, D. Reynolds, T. Niida, Xiong Wang, Kimberly Hill, Ki-Bum Lee, Mihael Makek, M. Finger, Y. Riabov, N. S. Bandara, A. Denisov, Maya Hachiya Shimomura, R. S. Hollis, E. O'Brien, S. I. Morrow, S. Sawada, A. Deshpande, Dong Jo Kim, B. Azmoun, Y. H. Leung, Vladimir Samsonov, N. Riveli, H. W. Yu, Dillon Scott Fitzgerald, J. Runchey, Kei Nagashima, T. V. Moukhanova, Y. Aramaki, V. Canoa Roman, M. Kurosawa, H. Hamagaki, T. Todoroki, A. Bazilevsky, S.V. Greene, Atsushi Takahara, A. N. Zelenski, J. H. Yoo, Y. Berdnikov, H. En'yo, A. Taranenko, R. Seidl, Vardan Khachatryan, Y. Watanabe, I. Yoon, D. E. Fields, Y. Gu, Raphael Noel Tieulent, I. Tserruya, M. Jezghani, D. Sharma, Y. I. Makdisi, R. Pak, M. X. Liu, M. E. Connors, K. A. Drees, D. Jouan, M. Sarsour, R. S. Towell, C. A. Ogilvie, Y. Kwon, A. Berdnikov, C. Nattrass, V. Singh, A. Hodges, H. Van Hecke, K. Ozawa, A. Sen, H. Asano, D. K. Mishra, Y. Ikeda, C. Pinkenburg, A. Lebedev, Yasuo Miake, S. Sato, T. Koblesky, N. N. Ajitanand, C. Y. Scarlett, P. Montuenga, J. Rak, J. Koster, J. L. Nagle, S. Nelson, J. Bryslawskyj, A. Sukhanov, S. J. Jeon, C. P. Wong, T. Moon, J. A. Key, K. DeBlasio, T. Gunji, Y. L. Yamaguchi, P. W. Stankus, T. Majoros, M. J. Leitch, T. Hachiya, G. D. N. Perera, J. Klatsky, L. Xue, I. J. Choi, B. Xia, J. Sziklai, K. Kurita, David Olle Rickard Silvermyr, K. Tanida, I. V. Sourikova, F. Wei, Yuki Watanabe, I. Younus, Norio Saito, R. Akimoto, L. Ding, D. Richford, C. L. Silva, A. Glenn, R. Pinson, Y. Akiba, P. V. Radzevich, D. Ivanishchev, D. McGlinchey, E. Joo, Roli Esha, J. B. Choi, K. Shigaki, J. Perry, V. Papavassiliou, M. Kofarago, A. S. Nyanin, D. Roach, C. E. Perezlara, Z. Ji, Tamas Novak, D. Yu Peressounko, M. J. Tannenbaum, T. K. Hemmick, S. H. Lim, Hari Guragain, B. Schaefer, A. Durum, P. Gallus, T. Murakami, M. Towell, A. Pun, Animesh Datta, T. Sumita, J. S. Kang, D. Kotov, Alexander Milov, C. L. Woody, I. Nakagawa, J. S. Bok, R. Belmont, L. Patel, Balazs Ujvari, Y. Zhai, V. Babintsev, C.Y. Chi, S. D. Rolnick, D. V. Perepelitsa, B. K. Schmoll, N. Novitzky, I. E. Yushmanov, M. Stepanov, S. Campbell, X. He, A. Mwai, D. Isenhower, Iu. Mitrankov, Tatsuya Chujo, T. C. Awes, Viktor Riabov, T. Rinn, D. P. Morrison, M. I. Nagy, R. A. Soltz, S. P. Sorensen, D. Watanabe, Anders Nils Erik Oskarsson, E. J. Desmond, J. Hanks, S. Miyasaka, Pawan Kumar Netrakanti, Byungsik Hong, S. Wolin, H. Sako, E. Vznuzdaev, A. Sexton, D. Kawall, M. Slunečka, A. Drees, B. Mulilo, N. Grau, X. Sun, A. Sickles, T. Sakaguchi, M. Rosati, B. M. Johnson, S. Beckman, S. Yalcin, R. Seto, Yongsun Kim, W. Peng, T. W. Danley, S. Ishimaru, J. Sun, J. G. Lajoie, Y. Imazu, Shota Suzuki, R. Nouicer, Hyun-Chul Kim, T. O. S. Haseler, B. Fadem, W. Fan, M. Vargyas, K. I. Hahn, Sándor Lökös, K. N. Barish, S. Zharko, P. Kline, A. Dion, M. L. Purschke, A. Enokizono, M. Beaumier, K. S. Joo, J. G. Rubin, N. Apadula, K. Sedgwick, S. Bathe, P. Shukla, Vladislav Manko, A. Timilsina, Christine Angela Aidala, X. H. Li, J. T. Mitchell, S. Mizuno, S. Hasegawa, N. A. Lewis, Henner Buesching, D. Kincses, S. H. Lee, C. McKinney, S. Nagamiya, K. Kihara, Qiao Xu, ShinIchi Esumi, A. Franz, J. C. Hill, Z. Citron, A. Yanovich, M. Leitgab, B. Meredith, Mate Csanad, A. Iordanova, S. Y. Han, J. Murata, H. A. Torii, B. Kurgyis, M. Nihashi, R. P. Pisani, U. Acharya, K. Homma, M. Chiu, Z. Rowan, M. Mendoza, M. L. Brooks, H. Ge, K. Nakano, I. Ravinovich, K. Boyle, M. Bai, V. Vrba, K. Imai, J. D. Osborn, Zirui Wang, M. Grosse Perdekamp, G. Mitsuka, J. E. Frantz, D. Lynch, A. Taketani, Priyanka Sett, C. P. Singh, D. S. Jumper, A.V. Kazantsev, J. D. Orjuela Koop, C. H. Chen, G. David, and A. Manion

Subjects
Physics, Scattering cross-section, 010308 nuclear & particles physics, Root (chord), Computer Science::Digital Libraries, 7. Clean energy, 01 natural sciences, Nuclear physics, Transverse plane, 0103 physical sciences, Transverse momentum, Rapidity, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

The PHENIX experiment at the Relativistic Heavy Ion Collider has measured the differential cross section, mean transverse momentum, mean transverse mo

Published
2020

46. Measurement of the cross section for hard exclusive π0 muoproduction on the proton

Author

C. Quintans, I.A. Savin, I. Konorov, M. Quaresma, A. Vidon, B. Marianski, Bakur Parsamyan, F. Tosello, M. Jandek, Anne-Laure Martin, Andres Cicuttin, A. Moretti, Valery E. Lyubovitskij, Andrea Ferrero, Norihiro Doshita, N. d'Hose, V.D. Samoylenko, W.-D. Nowak, H. Schmieden, J.M. Friedrich, V.F. Konstantinov, S. Huber, E. Zemlyanichkina, A. Gridin, C. Naim, F. Gautheron, M. A. Faessler, L. Dhara, B. Badelek, A. Maggiora, G. Nukazuka, B. Ketzer, Jen-Chieh Peng, B.M. Veit, A. Rychter, S. Wallner, S. Ishimoto, H. Fischer, V.N. Kolosov, S. Dalla Torre, R.P. Kurjata, S. V. Donskov, M. Pešek, A. Magnon, S.S. Dasgupta, S. Ramos, D.V. Peshekhonov, K. Zaremba, V.A. Polyakov, G.V. Meshcheryakov, Yu. V. Mikhailov, Adam Szabelski, A.G. Olshevsky, G. Sbrizzai, A.S. Nunes, S. Gerassimov, D. Panzieri, Janusz Marzec, N. Horikawa, D.I. Ryabchikov, A. Srnka, Z. Kral, G. D. Alexeev, W. Dünnweber, A. Amoroso, R. Longo, C.-Y. Hsieh, S. Platchkov, P. Zavada, G. Hamar, N. du Fresne von Hohenesche, Yu. Kisselev, A. Kveton, M. Stolarski, J. Lichtenstadt, M. Büchele, W. Augustyniak, Maria Liz Crespo, R. Heitz, V. Frolov, Soumen Paul, M. Chiosso, I. Gnesi, J.H. Koivuniemi, K. Juraskova, M. V. Zavertyaev, M. Ostrick, A. Nagaytsev, F. Balestra, V. Jary, M. Pešková, O.Yu. Denisov, T. Szameitat, N. Pierre, Miroslav Sulc, P. Sznajder, S. Tessaro, D. Hahne, M. Wilfert, D. Neyret, Jan Tomsa, W. Meyer, J.F.C.A. Veloso, O.P. Gavrichtchouk, Martin Bodlak, D. Steffen, L. Sinha, R.R. Dusaev, A.V. Efremov, E. Mitrofanov, Mikhail Mikhasenko, V. Tskhay, Alexandr Selyunin, T. Matsuda, F. Tessarotto, Laura Gonzalez Silva, K. Kurek, M. Wagner, Nour Makke, A. Thiel, W. C. Chang, Yakov Petrovich Kulinich, R. Beck, A. Kerbizi, M. Krämer, F. Krinner, M. Grosse Perdekamp, O.M. Kouznetsov, Andrew Ivanov, C. Riedl, S. Sarkar, B. Grube, M.G. Alexeev, Yu.A. Khokhlov, Franco Bradamante, A. Grasso, S. Uhl, P. Bordalo, Alessandro Bressan, D. von Harrach, J. Giarra, Johannes Bernhard, Ch. Dreisbach, A. Guskov, A. Antoshkin, V. Anosov, Frank Klein, C. Regali, Arseniy Rybnikov, Kamil Augsten, Aram Kotzinian, S.A. Mamon, Markus Ball, Y.-S. Lian, M. Meyer, A.G. Chumakov, F. Kunne, K. Kondo Horikawa, B.I. Vasilishin, Z.V. Kroumchtein, F. Kaspar, J. Pretz, J. Pochodzalla, P. Jörg, S. Levorato, V.E. Burtsev, N. Mitrofanov, Naomi C R Makins, M. Finger, V. Andrieux, Y. Bedfer, C. Chatterjee, M. Virius, J. Smolik, O. Subrt, Y. Miyachi, Yuxiang Zhao, A. Sandacz, C. Franco, S. Dasgupta, F. Pereira, Nikolay Anfimov, R. Joosten, J. Barth, Gerhard K. Mallot, E. Fuchey, Jan Matousek, G. Reicherz, M. Ziembicki, M. Slunecka, J. Nový, S.-U. Chung, François Herrmann, P.-J. Lin, G.V. Khaustov, P.D. Eversheim, H. Suzuki, C.D.R. Azevedo, A. Vauth, T. Iwata, M. Gorzellik, E. M. Kabuß, Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Antoshkin, A., Augsten, K., Augustyniak, W., Azevedo, C. D. R., Badelek, B., Balestra, F., Ball, M., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bodlak, M., Bordalo, P., Bradamante, F., Bressan, A., Buchele, M., Burtsev, V. E., Chang, W. -C., Chatterjee, C., Chiosso, M., Chumakov, A. G., Chung, S. -U., Cicuttin, A., Crespo, M. L., Dalla Torre, S., Dasgupta, S. S., Dasgupta, S., Denisov, O. Y., Dhara, L., Donskov, S. V., Doshita, N., Dreisbach, C., Dunnweber, W., Dusaev, R. R., Efremov, A., Eversheim, P. D., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, N., Friedrich, J. M., Frolov, V., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Gnesi, I., Gorzellik, M., Grasso, A., Gridin, A., Grosse Perdekamp, M., Grube, B., Guskov, A., Hahne, D., Hamar, G., von Harrach, D., Heitz, R., Herrmann, F., Horikawa, N., D'Hose, N., Hsieh, C. -Y., Huber, S., Ishimoto, S., Ivanov, A., Iwata, T., Jandek, M., Jary, V., Joosten, R., Jorg, P., Juraskova, K., Kabuss, E., Kaspar, F., Kerbizi, A., Ketzer, B., Khaustov, G. V., Khokhlov, Y. A., Kisselev, Y., Klein, F., Koivuniemi, J. H., Kolosov, V. N., Kondo Horikawa, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Kral, Z., Kramer, M., Krinner, F., Kroumchtein, Z. V., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Kveton, A., Levorato, S., Lian, Y. -S., Lichtenstadt, J., Lin, P. -J., Longo, R., Lyubovitskij, V. E., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Mamon, S. A., Marianski, B., Martin, A., Marzec, J., Matousek, J., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Y. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Moretti, A., Naim, C., Nagaytsev, A., Neyret, D., Novy, J., Nowak, W. -D., Nukazuka, G., Nunes, A. S., Olshevsky, A. G., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J. -C., Pereira, F., Pesek, M., Peshekhonov, D. V., Peskova, M., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Riedl, C., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sbrizzai, G., Schmieden, H., Selyunin, A., Silva, L., Sinha, L., Slunecka, M., Smolik, J., Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Tessaro, S., Tessarotto, F., Thiel, A., Tomsa, J., Tosello, F., Tskhay, V., Uhl, S., Vasilishin, B. I., Vauth, A., Veit, B. M., Veloso, J., Vidon, A., Virius, M., Wagner, M., Wallner, S., Wilfert, M., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Zhao, Y., Ziembicki, M., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and COMPASS

Subjects
Quantum chromodynamics, Muoproduction, Hard exclusive meson production, Generalised Parton Distributions, COMPASS, Photon, generalized parton distribution, Proton, Parton, measured [cross section], 01 natural sciences, Generalised Parton Distribution, Photon polarization, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment, Physics, Range (particle radiation), Large Hadron Collider, lcsh:QC1-999, ddc, angular dependence, beam [muon], polarization [photon], Nuclear and High Energy Physics, exclusive reaction, liquid: target [hydrogen], transverse [polarization], polarization: longitudinal, interference, Context (language use), leptoproduction [pi0], Nuclear physics, pi0: leptoproduction, hydrogen: liquid: target, 0103 physical sciences, polarization: transverse, ddc:530, 010306 general physics, longitudinal [polarization], 010308 nuclear & particles physics, muon: beam, cross section: measured, photon: polarization, High Energy Physics::Experiment, lcsh:Physics, experimental results
Abstract

Physics letters / B B805, 135454 (2020). doi:10.1016/j.physletb.2020.135454, Published by North-Holland Publ., Amsterdam

Published
2020

47. Antiproton over proton and K$^-$ over K$^+$ multiplicity ratios at high $z$ in DIS

Author

G. D. Alexeev, W. Dünnweber, R. Heitz, O.Yu. Denisov, A. Gridin, M. A. Faessler, W.-D. Nowak, R. Beck, A. Kerbizi, G.V. Meshcheryakov, A. Srnka, Yu. V. Mikhailov, F. Kunne, M. Grosse Perdekamp, C.-Y. Hsieh, V. Frolov, Soumen Paul, A. Grasso, W. Augustyniak, Miroslav Sulc, P. Sznajder, D.V. Peshekhonov, O.P. Gavrichtchouk, Martin Bodlak, L. Sinha, T. Matsuda, G. Nukazuka, A. Townsend, D. Steffen, A. Thiel, M. Stolarski, Yu. Kisselev, Pietro Faccioli, F. Tessarotto, Jan Tomsa, M.G. Alexeev, S. Uhl, A.V. Efremov, J. Giarra, I. Gnesi, M. Ostrick, Franco Bradamante, V. Anosov, M. Mikhasenko, A. Rychter, J. Lichtenstadt, Andres Cicuttin, A. Moretti, K. Zaremba, V.D. Samoylenko, V.A. Polyakov, V.N. Kolosov, A.G. Olshevsky, A. Maltsev, M. Quaresma, A.B. Ivanov, Alexandr Selyunin, I. Denisenko, S. Dalla Torre, G. Sbrizzai, M. Zemko, A. Amoroso, Arseniy Rybnikov, Nour Makke, W. C. Chang, D. Neyret, C. Chatterjee, Y. Miyachi, D. D'Ago, C. Naim, Yuxiang Zhao, Johannes Bernhard, Ch. Dreisbach, A. Guskov, B.M. Veit, R.R. Dusaev, M. V. Zavertyaev, V. Tskhay, Anne-Laure Martin, A. Sandacz, Antonin Kveton, C. Franco, B. Badelek, D.I. Ryabchikov, F. Tosello, K. Kondo Horikawa, M. Meyer, G. Mattson, A.G. Chumakov, B. Ketzer, E. M. Kabuß, C. Quintans, V.F. Konstantinov, S. Wallner, Norihiro Doshita, N. d'Hose, J.F.C.A. Veloso, Yakov Petrovich Kulinich, S. Ishimoto, J. Nový, H. Schmieden, I.A. Savin, H. Fischer, A. Antoshkin, M. Slunečka, J.M. Friedrich, J. Smolik, O.M. Kouznetsov, J. Berenguer Antequera, O. Subrt, S. Huber, A. Vidon, B. Marianski, Kamil Augsten, Bakur Parsamyan, J. Pretz, Valery E. Lyubovitskij, E. Zemlyanichkina, S. Platchkov, P. Zavada, R.P. Kurjata, M. Jandek, A. Maggiora, Maria Liz Crespo, K. Lavickova, R. Longo, S. Levorato, Frank Klein, Markus Ball, S.A. Mamon, S. V. Donskov, M. Pešek, V. Jary, A.S. Nunes, A. Koval, B. Ventura, B. Grube, Y.-S. Lian, S. Sarkar, J. Pochodzalla, D. Panzieri, Janusz Marzec, M. Chiosso, Alessandro Bressan, D. von Harrach, F. Kaspar, W. Meyer, K. Kurek, T. Rudnicki, P.M.M. Correia, I. Konorov, Aram Kotzinian, A. Magnon, Jen-Chieh Peng, B.I. Vasilishin, P. Jörg, V.E. Burtsev, F. Gautheron, N. Mitrofanov, Z. Kral, S.S. Dasgupta, A. Nagaytsev, F. Balestra, N. Pierre, Naomi C R Makins, S. Gerassimov, C. Riedl, M. Büchele, A. Vauth, M. Finger, N. Horikawa, J.H. Koivuniemi, T. Iwata, M. Gorzellik, M. Ziembicki, M. Pešková, M. Virius, S. Tessaro, G.V. Khaustov, P.D. Eversheim, H. Suzuki, C.D.R. Azevedo, M. Wagner, H. Pekeler, F. Krinner, Yu.A. Khokhlov, J. Barth, Gerhard K. Mallot, R. Joosten, S. Dasgupta, V. Andrieux, S.-U. Chung, Y. Bedfer, E. Mitrofanov, François Herrmann, P.-J. Lin, Jan Matousek, G. Reicherz, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and COMPASS

Subjects
Proton, Isoscalar, Hadron, 0 [higher-order], Deep-inelastic scattering, target: isoscalar, 01 natural sciences, COMPASS, deep inelastic scattering [muon+ nucleon], High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], anti-p: multiplicity, Invariant mass, isoscalar [target], Nuclear Experiment (nucl-ex), Nuclear Experiment, Hadron multiplicities, Quantum chromodynamics, Physics, multiplicity [K+], quark: fragmentation function, higher-order: 0, K+: multiplicity, photon, perturbation theory: higher-order, higher-order: 1, multiplicity [anti-p], lcsh:QC1-999, Bjorken [scaling], beam [muon], factorization [cross section], 1 [higher-order], Particle Physics - Experiment, perturbation theory [quantum chromodynamics], Nuclear and High Energy Physics, FOS: Physical sciences, ratio [multiplicity], pQCD, fragmentation function [quark], scaling: Bjorken, x-dependence, Nuclear physics, phase space, 0103 physical sciences, ddc:530, quantum chromodynamics: perturbation theory, 010306 general physics, muon+ nucleon: deep inelastic scattering, p: multiplicity, Muon, multiplicity [K-], multiplicity: ratio, 010308 nuclear & particles physics, hep-ex, muon: beam, cross section: factorization, CERN SPS, Deep inelastic scattering, multiplicity: measured [charged particle], higher-order [perturbation theory], K-: multiplicity, Antiproton, High Energy Physics::Experiment, lcsh:Physics, charged particle: multiplicity: measured, hadronization, multiplicity [p], experimental results
Abstract

The $\bar{\rm p} $ over p multiplicity ratio is measured in deep-inelastic scattering for the first time using (anti-) protons carrying a large fraction of the virtual-photon energy, $z>0.5$. The data were obtained by the COMPASS Collaboration using a 160 GeV muon beam impinging on an isoscalar $^6$LiD target. The regime of deep-inelastic scattering is ensured by requiring $Q^2$ > 1 (GeV/$c$)$^2$ for the photon virtuality and $W > 5$ GeV/$c^2$ for the invariant mass of the produced hadronic system. The range in Bjorken-$x$ is restricted to $0.01 < x < 0.40$. Protons and antiprotons are identified in the momentum range $20 ��60$ GeV/$c$. In the whole studied $z$-region, the $\bar{\rm p}$ over p multiplicity ratio is found to be below the lower limit expected from calculations based on leading-order perturbative Quantum Chromodynamics (pQCD). Extending our earlier analysis of the K$^-$ over K$^+$ multiplicity ratio by including now events with larger virtual-photon energies, this ratio becomes closer to the expectation of next-to-leading order pQCD. The results of both analyses strengthen our earlier conclusion that the phase space available for hadronisation should be taken into account in the pQCD formalism., 19 pages, 7 figures, 3 tables

Published
2020

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

Author

S. Gerassimov, N. Horikawa, A. Srnka, A.G. Olshevsky, A. Rychter, F. Tosello, S. Tessaro, D. Hahne, R. Longo, M. Wilfert, V.N. Kolosov, L. Capozza, K. Kondo, F. Krinner, Yu.A. Khokhlov, Y.-S. Lian, C. Quintans, Alexandr Selyunin, Andrea Ferrero, I. Konorov, Y. Bedfer, K. Zaremba, C. Regali, C. Chatterjee, T. Sawada, Norihiro Doshita, V.A. Polyakov, Nour Makke, W. C. Chang, N. d'Hose, F. Kunne, Valery E. Lyubovitskij, C. Franco, R.R. Dusaev, V. Tskhay, Z.V. Kroumchtein, M. Chiosso, G. Sbrizzai, M. Quaresma, J. Barth, J. Smolik, E. Seder, J.F.C.A. Veloso, S.A. Mamon, O. Subrt, A. Amoroso, C.-Y. Hsieh, L. Dhara, B. Badełek, M. Ziembicki, Franco Bradamante, F. Pereira, N. du Fresne von Hohenesche, O.M. Kouznetsov, M. Stolarski, T. Szameitat, M. Grosse Perdekamp, B.M. Veit, A. Grasso, A. Gridin, A. Vidon, B. Marianski, Bakur Parsamyan, W. Augustyniak, S. Ramos, D.V. Peshekhonov, G. Pesaro, S. Platchkov, P. Zavada, Maria Liz Crespo, Miroslav Sulc, A. Kveton, Y. Miyachi, A.A. Lednev, P. Schiavon, M. A. Faessler, G.V. Khaustov, V. Frolov, B. Ketzer, Soumen Paul, R. Birsa, Jen-Chieh Peng, J. Lichtenstadt, P. Sznajder, J. Pochodzalla, V. Jary, Anne-Laure Martin, P. Jörg, S.S. Dasgupta, I. Gnesi, H. Schmieden, D. Steffen, Andrew Ivanov, S. Sarkar, Yu. Kisselev, O.P. Gavrichtchouk, Martin Bodlak, J.M. Friedrich, A. Sandacz, A. Vauth, H. Matsuda, R. Salac, M. Ostrick, S. Levorato, L. Sinha, T. Matsuda, D. Neyret, S. Dasgupta, A. Austregesilo, P. Bordalo, R. Akhunzyanov, Laura Silva, V.F. Konstantinov, Yakov Petrovich Kulinich, E.R. Bielert, D.I. Ryabchikov, A. Thiel, Q. Curiel, V.E. Burtsev, N. Mitrofanov, S. Huber, S. Wallner, E.A. Levchenko, S. Ishimoto, D. von Harrach, H. Fischer, E. M. Kabuß, E. Zemlyanichkina, Naomi C R Makins, G. D. Alexeev, R.P. Kurjata, Jan Tomsa, M. V. Zavertyaev, W. Dünnweber, K. Bicker, I.A. Savin, C. Marchand, M. Büchele, M.G. Alexeev, M. Krämer, S. Uhl, M. Finger, G. Hamar, J. Giarra, A.V. Efremov, Ilya Kuznetsov, J.H. Koivuniemi, Michal Dziewiecki, Andres Cicuttin, A. Moretti, I. Orlov, V.D. Samoylenko, Jan Matousek, G. Reicherz, Nikolay Anfimov, M. Pešková, M. Gorzellik, R. Heitz, M. Virius, J. Nový, R. Joosten, O.Yu. Denisov, Z. Kral, S. Dalla Torre, A. Antoshkin, P.D. Eversheim, F. Klein, Kamil Augsten, S.-U. Chung, G.V. Meshcheryakov, H. Suzuki, C.D.R. Azevedo, Yu. V. Mikhailov, R. Beck, A. Kerbizi, S. Sirtl, A. Maggiora, F. Tessarotto, Mikhail Mikhasenko, F. Nerling, François Herrmann, B. Grube, Johannes Bernhard, Ch. Dreisbach, S. V. Donskov, A. Guskov, M. Pešek, A.S. Nunes, Andrea Bressan, Markus Ball, D. Panzieri, Janusz Marzec, M. Tasevsky, E. Mitrofanov, G. Nukazuka, M. Slunecka, A. Magnon, Takahiro Iwata, Federica Sozzi, W. Meyer, K. Kurek, Gerhard K. Mallot, Aram Kotzinian, R. Windmolders, B.I. Vasilishin, M. Meyer, A.G. Chumakov, J. Pretz, Arseniy Rybnikov, W.-D. Nowak, V. Anosov, V. Andrieux, Adam Szabelski, A. Nagaytsev, F. Balestra, N. Pierre, F. Gautheron, C. Riedl, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, COMPASS, Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Antoshkin, A., Augsten, K., Augustyniak, W., Austregesilo, A., Azevedo, C. D. R., Badełek, B., Balestra, F., Ball, M., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E. R., Birsa, R., Bodlak, M., Bordalo, P., Bradamante, F., Bressan, A., Büchele, M., Burtsev, V. E., Capozza, L., Chang, W. -C., Chatterjee, C., Chiosso, M., Chumakov, A. G., Chung, S. -U., Cicuttin, A., Crespo, M. L., Curiel, Q., Dalla Torre, S., Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Dhara, L., Donskov, S. V., Doshita, N., Dreisbach, Ch., Dünnweber, W., Dusaev, R. R., Dziewiecki, M., Efremov, A., Eversheim, P. D., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, N., Friedrich, J. M., Frolov, V., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Gnesi, I., Gorzellik, M., Grasso, A., Gridin, A., Grosse Perdekamp, M., Grube, B., Guskov, A., Hahne, D., Hamar, G., von Harrach, D., Heitz, R., Herrmann, F., Horikawa, N., D'Hose, N., Hsieh, C. -Y., Huber, S., Ishimoto, S., Ivanov, A., Iwata, T., Jary, V., Joosten, R., Jörg, P., Kabuß, E., Kerbizi, A., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Kral, Z., Krämer, M., Krinner, F., Kroumchtein, Z. V., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Kuznetsov, I. I., Kveton, A., Lednev, A. A., Levchenko, E. A., Levorato, S., Lian, Y. -S., Lichtenstadt, J., Longo, R., Lyubovitskij, V. E., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Mamon, S. A., Marchand, C., Marianski, B., Martin, A., Marzec, J., Matoušek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Yu. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Moretti, A., Nagaytsev, A., Nerling, F., Neyret, D., Nový, J., Nowak, W. -D., Nukazuka, G., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J. -C., Pereira, F., Pesaro, G., Pešek, M., Pešková, M., Peshekhonov, D. V., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Riedl, C., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, G., Schiavon, P., Schmieden, H., Seder, E., Selyunin, A., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sozzi, F., Smolik, J., Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Tasevsky, M., Tessaro, S., Tessarotto, F., Thiel, A., Tomsa, J., Tosello, F., Tskhay, V., Uhl, S., Vasilishin, B. I., Vauth, A., Veit, B. M., Veloso, J., Vidon, A., Virius, M., Wallner, S., Wilfert, M., Windmolders, R., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., and Ziembicki, M.

Subjects
Hadron, 0 [higher-order], target: isoscalar, 01 natural sciences, COMPASS, deep inelastic scattering [muon+ nucleon], High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), K: multiplicity, High Energy Physics - Phenomenology (hep-ph), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], isoscalar [target], Invariant mass, Nuclear Experiment, Boson, Physics, Quantum chromodynamics, quark: fragmentation function, higher-order: 0, photon, perturbation theory: higher-order, hep-ph, мюоны, lcsh:QC1-999, Bjorken [scaling], High Energy Physics - Phenomenology, beam [muon], рассеяние, factorization [cross section], multiplicity [pi], Particle Physics - Experiment, perturbation theory [quantum chromodynamics], Particle physics, Nuclear and High Energy Physics, Meson, FOS: Physical sciences, ratio [multiplicity], fragmentation function [quark], x-dependence, scaling: Bjorken, charged particle: multiplicity, phase space, multiplicity [charged particle], [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], виртуальные фотоны, 0103 physical sciences, ddc:530, universality, quantum chromodynamics: perturbation theory, 010306 general physics, Particle Physics - Phenomenology, muon+ nucleon: deep inelastic scattering, Muon, multiplicity: ratio, pi: multiplicity, 010308 nuclear & particles physics, hep-ex, muon: beam, Multiplicity (mathematics), cross section: factorization, CERN SPS, Deep inelastic scattering, higher-order [perturbation theory], [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], каоны, [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, multiplicity [K], hadronization, lcsh:Physics, experimental results
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 $^6$LiD target. The regime of deep-inelastic scattering is ensured by requiring $Q^2>1$ (GeV/$c)^2$ for the photon virtuality and $W>5$ GeV/$c^2$ 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., Comment: 16 pages, 7 figures

Published
2018

49. Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS

Author

F. Tosello, Andrea Ferrero, Jen-Chieh Peng, Norihiro Doshita, N. d'Hose, W.-D. Nowak, S. Ramos, S.S. Dasgupta, J. Smolik, Valery E. Lyubovitskij, Nikolay Anfimov, R. Joosten, O. Subrt, A. Koval, B. Ventura, J.F.C.A. Veloso, M. Mikhasenko, R.R. Dusaev, V. Tskhay, G.V. Meshcheryakov, B. Grube, H. Pekeler, P.D. Eversheim, H. Suzuki, C.D.R. Azevedo, Anne-Laure Martin, A. Srnka, Yu. V. Mikhailov, F. Tessarotto, K. Kondo Horikawa, G. Mattson, A.B. Ivanov, Alexandr Selyunin, M. Virius, Y. Miyachi, Yuxiang Zhao, Frank Klein, J. Lichtenstadt, M. Quaresma, O.M. Kouznetsov, O.Yu. Denisov, F. Gautheron, C. Chatterjee, K. Zaremba, P.M.M. Correia, V. Andrieux, Y. Bedfer, Markus Ball, Nour Makke, I. Konorov, S. Sarkar, V. Anosov, V.F. Konstantinov, W. C. Chang, M. V. Zavertyaev, V.A. Polyakov, Alessandro Bressan, D. Neyret, A. Sandacz, C. Franco, P. Jörg, G. Sbrizzai, B.M. Veit, S. Wallner, D. von Harrach, F. Kunne, Adam Szabelski, J. Agarwala, Miroslav Sulc, M. Meyer, Z. Kral, S. Levorato, A.G. Chumakov, A. Amoroso, A. Vauth, D.I. Ryabchikov, A. Magnon, C.-Y. Hsieh, V.E. Burtsev, O.P. Gavrichtchouk, S. Ishimoto, Martin Bodlak, L. Sinha, T. Matsuda, W. Augustyniak, H. Fischer, V. Frolov, Soumen Paul, N. Mitrofanov, R. Beck, T. Rudnicki, R.P. Kurjata, A. Kerbizi, Naomi C R Makins, A. Grasso, A. Townsend, M. Büchele, A.G. Olshevsky, K. Lavickova, J. Pretz, R. Longo, D.V. Peshekhonov, A. Nagaytsev, F. Balestra, M. Finger, M. Wilfert, T. Iwata, S. Platchkov, P. Zavada, N. Pierre, Jan Matousek, G. Reicherz, J.H. Koivuniemi, M. Grosse Perdekamp, Maria Liz Crespo, Yakov Petrovich Kulinich, F. Pereira, Y.-S. Lian, M. Gorzellik, S.-U. Chung, A. Antoshkin, P. Sznajder, S. V. Donskov, M. Pešek, V. Jary, A. Gridin, M. Stolarski, J. Nový, M.G. Alexeev, M. A. Faessler, S. Uhl, François Herrmann, P.-J. Lin, J. Giarra, Kamil Augsten, M. Pešková, I. Gnesi, A.S. Nunes, D. Panzieri, Janusz Marzec, J. Berenguer Antequera, Arseniy Rybnikov, M. Ziembicki, D. Steffen, Jan Tomsa, Franco Bradamante, Yu. Kisselev, E. M. Kabuß, A.V. Efremov, C. Riedl, P. Bordalo, Johannes Bernhard, Ch. Dreisbach, A. Guskov, C. Quintans, A. Maggiora, A. Thiel, I.A. Savin, M. Ostrick, G. D. Alexeev, G.V. Khaustov, W. Dünnweber, M. Slunečka, A. Kveton, R. Heitz, Andres Cicuttin, A. Moretti, V.D. Samoylenko, M. Jandek, S.A. Mamon, A. Maltsev, I. Denisenko, S. Dalla Torre, G. Nukazuka, M. Chiosso, J. Pochodzalla, M. Zemko, F. Kaspar, W. Meyer, K. Kurek, A. Vidon, B. Marianski, Bakur Parsamyan, S. Gerassimov, N. Horikawa, S. Tessaro, M. Wagner, F. Krinner, Yu.A. Khokhlov, Aram Kotzinian, B.I. Vasilishin, J. Barth, S. Dasgupta, E. Mitrofanov, Gerhard K. Mallot, D. D'Ago, C. Naim, L. Dhara, B. Badelek, B. Ketzer, H. Schmieden, J.M. Friedrich, S. Huber, E. Zemlyanichkina, A. Rychter, V.N. Kolosov, Agarwala, J., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Antoshkin, A., Augsten, K., Augustyniak, W., Azevedo, C. D. R., Badelek, B., Balestra, F., Ball, M., Barth, J., Beck, R., Bedfer, Y., Berenguer Antequera, J., Bernhard, J., Bodlak, M., Bordalo, P., Bradamante, F., Bressan, A., Buchele, M., Burtsev, V. E., Chang, W. -C., Chatterjee, C., Chiosso, M., Chumakov, A. G., Chung, S. -U., Cicuttin, A., Correia, P. M. M., Crespo, M. L., D'Ago, D., Dalla Torre, S., Dasgupta, S. S., Dasgupta, S., Denisenko, I., Denisov, O. Y., Dhara, L., Donskov, S. V., Doshita, N., Dreisbach, C., Dunnweber, W., Dusaev, R. R., Efremov, A., Eversheim, P. D., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., Friedrich, J. M., Frolov, V., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Gnesi, I., Gorzellik, M., Grasso, A., Gridin, A., Grosse Perdekamp, M., Grube, B., Guskov, A., von Harrach, D., Heitz, R., Herrmann, F., Horikawa, N., D'Hose, N., Hsieh, C. -Y., Huber, S., Ishimoto, S., Ivanov, A., Iwata, T., Jandek, M., Jary, V., Joosten, R., Jorg, P., Kabuss, E., Kaspar, F., Kerbizi, A., Ketzer, B., Khaustov, G. V., Khokhlov, Y. A., Kisselev, Y., Klein, F., Koivuniemi, J. H., Kolosov, V. N., Kondo Horikawa, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Koval, A., Kral, Z., Krinner, F., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Kveton, A., Lavickova, K., Levorato, S., Lian, Y. -S., Lichtenstadt, J., Lin, P. -J., Longo, R., Lyubovitskij, V. E., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Maltsev, A., Mamon, S. A., Marianski, B., Martin, A., Marzec, J., Matousek, J., Matsuda, T., Mattson, G., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Y. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Moretti, A., Nagaytsev, A., Naim, C., Neyret, D., Novy, J., Nowak, W. -D., Nukazuka, G., Nunes, A. S., Olshevsky, A. G., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Pekeler, H., Peng, J. -C., Pereira, F., Pesek, M., Peshekhonov, D. V., Peskova, M., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Reicherz, G., Riedl, C., Rudnicki, T., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sbrizzai, G., Schmieden, H., Selyunin, A., Sinha, L., Slunecka, M., Smolik, J., Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Szabelski, A., Sznajder, P., Tessaro, S., Tessarotto, F., Thiel, A., Tomsa, J., Tosello, F., Townsend, A., Tskhay, V., Uhl, S., Vasilishin, B. I., Vauth, A., Veit, B. M., Veloso, J., Ventura, B., Vidon, A., Virius, M., Wagner, M., Wallner, S., Wilfert, M., Zaremba, K., Zavada, P., Zavertyaev, M., Zemko, M., Zemlyanichkina, E., Zhao, Y., Ziembicki, M., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and COMPASS

Subjects
HERMES experiment, virtual [photon], Hadron, leptoproduction [hadron], measurement methods, Nuclear Theory, Virtual particle, HERMES, 01 natural sciences, SIDIS, COMPASS, hadron: leptoproduction, High Energy Physics - Experiment, azimthal asymmetrie, production [diffraction], High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), semi-inclusive reaction [deep inelastic scattering], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], COMPASS experiment, Nuclear Experiment, Physics, deep inelastic scattering: semi-inclusive reaction, nucleon, hep-ph, photon: energy, TMD obsvervable, angular dependence, High Energy Physics - Phenomenology, modulation, hadron: final state, TMD obsvervables, beam [muon], asymmetry [angular distribution], interpretation of experiments, deuteron: target, transverse momentum [quark], Nucleon, diffraction: production, Particle Physics - Experiment, Quark, Nuclear and High Energy Physics, Particle physics, azimthal asymmetries, exclusive reaction, angular distribution: asymmetry, Meson, FOS: Physical sciences, vector meson: production, 0103 physical sciences, kinematics: effect, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, ddc:530, final state [hadron], 010306 general physics, Particle Physics - Phenomenology, Muon, muon: beam, 010308 nuclear & particles physics, production [vector meson], hep-ex, energy [photon], CERN SPS, effect [kinematics], lcsh:QC770-798, quark: transverse momentum, High Energy Physics::Experiment, target [deuteron], photon: virtual
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 $^6$LiD target. In both cases, the amplitudes of the $\cos\phi_h$ and $\cos 2\phi_h$ 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 $\cos 2\phi_h$ modulation gives indication for a non-zero Boer-Mulders effect., Comment: 13 pages, 7 figures

Published
2019

50. 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

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