Author: "Kunne, F." / Topic: high energy physics::experiment - Searchworks@Jio Institute Digital Library Search Results

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102 results on '"Kunne, F."'

1. Probing transversity by measuring Λ polarisation in SIDIS

Author: Compass Collaboration, Alexeev, G. D., Balestra, F., Kunne, F., Kurek, K., Kurjata, R. P., Kveton, A., Lavickova, K., Levorato, S., Lian, Y.-S., Lichtenstadt, J., Lin, P.-J., Longo, R., Ball, M., Lyubovitskij, V. E., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Maltsev, A., Mamon, S. A., Marianski, B., Martin, A., Barth, J., Marzec, J., Matoušek, J., Matsuda, T., Mattson, G., Meshcheryakov, G. V., Metzger, F., Meyer, M., Meyer, W., Mikhailov, Yu V., Mikhasenko, M., Beck, R., Mitrofanov, E., Miyachi, Y., Moretti, A., Nagaytsev, A., Naim, C., Negrini, T. S., Neyret, D., Nový, J., Nowak, W.-D., Nukazuka, G., Bedfer, Y., Nunes, A. S., Olshevsky, A. G., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Pekeler, H., Peng, J.-C., Rudnicki, T., Pešek, M., Berenguer Antequera, J., Peshekhonov, D. V., Pešková, M., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, Jörg, Quaresma, M., Quintans, C., Reicherz, G., Bernhard, J., Riedl, C., Ryabchikov, D. I., Rychter, A., Rymbekova, A., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, P., Bodlak, M., Schmieden, H., Selyunin, A., Sharko, K., Sinha, L., Slunecka, M., Smolik, J., Sozzi, F., Srnka, A., Steffen, D., Stolarski, M., Bradamante, F., Subrt, O., Sulc, M., Suzuki, H., Sznajder, P., Tessaro, S., Tessarotto, F., Thiel, A., Tomsa, J., Tosello, F., Townsend, A., Bressan, A., Tskhay, V., Uhl, S., Vasilishin, B. I., Vauth, A., Veit, B. M., Veloso, J., Ventura, B., Vidon, A., Virius, M., Wagner, M., Alexeev, M. G., Burtsev, V. E., Wallner, S., Zaremba, K., Zavada, P., Zavertyaev, M., Zemko, M., Zemlyanichkina, E., Zhao, Y., Ziembicki, M., 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., Amoroso, A., Dalla Torre, S., Dasgupta, S. S., Dasgupta, S., Denisenko, I., Denisov, O. Yu, Donskov, S. V., Doshita, N., Dreisbach, Ch., Dünnweber, W., Dusaev, R. R., Andrieux, V., Efremov, A., Elia, C., Eremeev, D., Eversheim, P. D., Faccioli, P., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Anosov, V., Flöthner, K. J., Franco, C., Friedrich, J. M., Frolov, V., Garcia Ordòñez, L. G., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Giordano, D., Augsten, K., Gnesi, I., Gorzellik, M., Grasso, A., Gridin, A., Grosse Perdekamp, M., Grube, B., Guskov, A., von Harrach, D., Heitz, R., Hoffmann, M., Augustyniak, W., Horikawa, N., d'Hose, N., Hsieh, C.-Y., Huber, S., Ishimoto, S., Ivanov, A., Iwata, T., Jandek, M., Jary, V., Joosten, R., Azevedo, C. D. R., Kabuß, E., Kang, D.-H., Kaspar, F., Kerbizi, A., Ketzer, B., Khaustov, G. V., Khokhlov, Yu A., Kisselev, Yu., Klein, F., Koivuniemi, J. H., Badełek, B., 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., Alexeev, Gd, Alexeev, Mg, Amoroso, A, Andrieux, V, Anosov, V, Augsten, K, Augustyniak, W, Azevedo, Cdr, Badelek, B, Balestra, F, Ball, M, Barth, J, Beck, R, Bedfer, Y, Antequera, Jb, Bernhard, J, Bodlak, M, Bradamante, F, Bressan, A, Burtsev, Ve, Chang, Wc, Chatterjee, C, Chiosso, M, Chumakov, Ag, Chung, Su, Cicuttin, A, Correia, Pmm, Crespo, Ml, D'Ago, D, Dalla Torre, S, Dasgupta, S, Denisenko, I, Denisov, Oy, Donskov, Sv, Doshita, N, Dreisbach, C, Dunnweber, W, Dusaev, Rr, Efremov, A, Elia, C, Eremeev, D, Eversheim, Pd, Faccioli, P, Faessler, M, Ferrero, A, Finger, M, Fischer, H, Flothner, Kj, Franco, C, Friedrich, Jm, Frolov, V, Ordonez, Lgg, Gautheron, F, Gavrichtchouk, Op, Gerassimov, S, Giarra, J, Giordano, D, Gnesi, I, Gorzellik, M, Grasso, A, Gridin, A, Perdekamp, Mg, Grube, B, Guskov, A, von Harrach, D, Heitz, R, Hoffmann, M, Horikawa, N, D'Hose, N, Hsieh, Cy, Huber, S, Ishimoto, S, Ivanov, A, Iwata, T, Jandek, M, Jary, V, Joosten, R, Kabuss, E, Kang, Dh, Kaspar, F, Kerbizi, A, Ketzer, B, Khaustov, Gv, Khokhlov, Ya, Kisselev, Y, Klein, F, Koivuniemi, Jh, Kolosovs, Vn, Horikawa, Kk, Konorov, I, Konstantinov, Vf, Kotzinian, Am, Kouznetsov, Om, Koval, A, Kral, Z, Krinner, F, Kulinich, Y, Kunne, F, Kurek, K, Kurjata, Rp, Kveton, A, Lavickova, K, Levorato, S, Lian, Y, Lichtenstadt, J, Lin, N, Longo, R, Lyubovitskij, Ve, Maggiora, A, Magnon, A, Makins, N, Makke, N, Mallot, Gk, Maltsev, A, Mamon, Sa, Marianski, B, Martin, A, Marzec, J, Matousek, J, Matsuda, T, Mattson, G, Meshcheryakov, Gv, Metzger, F, Meyer, M, Meyer, W, Mikhailov, Yv, Mikhasenko, M, Mitrofanov, E, Miyachi, Y, Moretti, A, Nagaytsev, A, Naim, C, Negrini, T, Neyret, D, Novy, J, Nowak, Wd, Nukazuka, G, Nunes, A, Olshevsky, Ag, Ostrick, M, Panzieri, D, Parsamyan, B, Paul, S, Pekeler, H, Peng, Jc, Pesek, M, Peshekhonov, Dv, Peskova, M, Pierre, N, Platchkov, S, Pochodzalla, J, Polyakov, Va, Pretz, J, Quaresma, M, Quintans, C, Reicherz, G, Riedl, C, Rudnicki, T, Ryabchikov, Di, Rychter, A, Rymbekova, A, Samoylenko, Vd, Sandacz, A, Sarkar, S, Savin, Ia, Sbrizzai, G, Schiavon, R, Schmieden, H, Selyunin, A, Sharko, K, Sinha, L, Slunecka, M, Smolik, J, Sozzi, F, Srnka, A, Steffen, D, Stolarski, M, Subrt, O, Sulc, M, Suzuki, H, Sznajder, R, Tessaro, S, Tessarotto, F, Thiel, A, Tomsa, J, Tosello, F, Townsend, A, Tskhay, V, Uhl, S, Vasilishin, Bi, Vauth, A, Veit, Bm, Veloso, J, Ventura, B, Vidon, A, Virius, M, Wagner, M, Wallner, S, Zaremba, K, Zavada, R, 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: quark: distribution function, Nuclear and High Energy Physics, QC1-999, polarization: longitudinal, Nuclear Theory, mass spectrum: (anti-p pi+), FOS: Physical sciences, muon: secondary beam, 01 natural sciences, COMPASS, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), mass spectrum: (p pi-), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Quantum chromodynamic, quark: polarization: transverse, ddc:530, 010306 general physics, Nuclear Experiment, hyperon: final state, Antilambda: polarization, deep inelastic scattering: semi-inclusive reaction, 010308 nuclear & particles physics, polarized target: transverse, Physics, High Energy Physics::Phenomenology, Lambda: polarization, nucleon: polarization: transverse, CERN SPS, Lambda polarisation, Transversity, High Energy Physics::Experiment, Quantum chromodynamics, Deep inelastic scattering, muon: polarized beam, spin: asymmetry, Particle Physics - Experiment, experimental results
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 $h_1^q$ are nowadays well established. Several possible channels to access these functions were originally proposed. One candidate is the measurement of the polarisation of $\Lambda$ 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 $\Lambda$ and $\bar{\Lambda}$ 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 $h_1^u$ and $h_1^d$., Comment: 18 pages, 6 figures
Published: 2022

2. Double $J/ψ$ production in pion-nucleon scattering at COMPASS

Author: Alexeev, G. D., Alexeev, M. G., Amoroso, A., Andrieux, V., Anosov, V., Augsten, K., Augustyniak, W., Azevedo, C. D. R., Badelek, B., Ball, M., Barth, J., Beck, R., Bedfer, Y., 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., Duennweber, W., Dusaev, R. R., Efremov, A., Eremeev, D., Eversheim, P. D., Faccioli, P., Faessler, M., Finger, M., Fischer, H., Floethner, K., Florian, W, Franco, C., Friedrich, J. M., Frolov, V., Ordonez, L. G. Garcia, Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Giordano, D., Gorzellik, M., Grasso, A., Gridin, A., Groote, S., Perdekamp, M. Grosse, Grube, B., Gruener, M., Guskov, A., von Harrach, D., Hoffmann, M., Horikawa, N., d'Hose, N., Hsieh, C. -Y., Huber, S., Ishimoto, S., Ivanov, A., Iwata, T., Jandek, M., Jary, T., Joosten, R., Kabuss, E., Kaspar, F., Kerbizi, A., Ketzer, B., Khatun, A., Khaustov, G. V., Khokhlov, Yu. A., Klein, F., Koivuniemi, J. H., Kolosov, V. N., Horikawa, K. Kondo, Konorov, I., Konstantinov, V. F., Korzenev, A., Koshkarev, S., Kotzinian, A. M., Kouznetsov, O. M., Koval, A., Kral, Z., Krinner, F., 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., Martin, A., Marzec, J., Matousek, J., Matsuda, T., Mattson, G., Pires, C. Menezes, Metzger, F., Meyer, M., Meyer, W., Mikhailov, Yu. V., Mikhasenko, M., Mitrofanov, E., Miyachi, Y., Molina, R., Moretti, A., Nagaytsev, A., Naim, C., Neyret, D., Novy, J., Nowak, W. -D., Nukazuka, G., Olshevsky, A. G., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Pekeler, H., Peng, J. -C., Pesek, M., Peshekhonov, D. V., Peskova, M., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Reicherz, G., Riedl, C., Rudnicki, T., Ryabchikov, D. I., Rychter, A., Rymbekova, A., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sbrizzai, G., Schmeing, S., Schmieden, H., Selyunin, A., Sharko, K., Sinha, L., Slunecka, M., Spuelbeck, D., Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Tessaro, S., Tessarotto, F., Thiel, A., Tomsa, J., Tosello, F., Townsend, A., Triloki, T., Tskhaty, V., Valinoti, B., Veit, B. M., Veloso, J. F. C. A., Ventura, B., Virius, M., Wagner, M., Wallner, S., Zaremba, K., Zavertyaev, M., Zemko, M., Zemlyanichkina, E., and Ziembicki, M.
Subjects: High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment
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 NH$_{3}$, 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 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 pion is evaluated. No significant signatures that could be associated with exotic tetraquarks are found in the double $J/ψ$ mass spectrum., 12 pages, 4 figures
Published: 2022
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3. Triangle Singularity as the Origin of the $a_1(1420)$

Author: Alexeev, G. D., Alexeev, M. G., Amoroso, A., Andrieux, 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., 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., Duennweber, W., Dusaev, R. R., Efremov, A., Eversheim, P. D., Faccioli, P., Faessler, M., Finger, M., Finger jr., 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, T., Joosten, R., Joerg, P., Kabuss, E., Kaspar, F., 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., 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, Yu. 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., Olshevskiy, A. G., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Pekeler, H., Peng, J. -C., Pesek, M., Peshekhonov, D. V., Peskova, M., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, 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., 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., 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, 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., Berenguer Antequera, J., 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., Dalla Torre, S., 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., 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., Jörg, P., Kabuß, E., Kaspar, F., Kerbizi, A., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., 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., 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., 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., 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: isovector, partial wave, meson: exotic, FOS: Physical sciences, axial-vector, quantum number, COMPASS, singularity, High Energy Physics - Experiment, High Energy Physics - Phenomenology, hadron physics, resonance, High Energy Physics - Experiment (hep-ex), compass, High Energy Physics - Phenomenology (hep-ph), resonance, quality, hadron physics, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, ground state, structure, compa, Particle Physics - Experiment
Abstract: The COMPASS experiment recently discovered a new isovector resonance-like signal with axial-vector quantum numbers, the $a_1(1420)$, decaying to $f_0(980)\pi$. With a mass too close to and a width smaller than the axial-vector ground state $a_1(1260)$, it was immediately interpreted as a new light exotic meson, similar to the $X$, $Y$, $Z$ states in the hidden-charm sector. We show that a resonance-like signal fully matching the experimental data is produced by the decay of the $a_1(1260)$ resonance into $K^\ast(\to K\pi)\bar{K}$ and subsequent rescattering through a triangle singularity into the coupled $f_0(980)\pi$ channel. The amplitude for this process is calculated using a new approach based on dispersion relations. The triangle-singularity model is fitted to the partial-wave data of the COMPASS experiment. Despite having less parameters, this fit shows a slightly better quality than the one using a resonance hypothesis and thus eliminates the need for an additional resonance in order to describe the data. We thereby demonstrate for the first time in the light-meson sector that a resonance-like structure in the experimental data can be described by rescattering through a triangle singularity, providing evidence for a genuine three-body effect., Comment: 7 pages, 5 figures
Published: 2021

4. Measurement of PT-weighted Sivers asymmetries in leptoproduction of hadrons

Author: COMPASS Collaboration, Alexeev, M. G., Azevedo, C. D. R., Kral, Z., Krämer, M., Krinner, F., Kroumchtein, Z. V., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Kveton, A., Lednev, A. A., Badełek, B., Levorato, S., Lian, Y.-S., Lichtenstadt, J., Longo, R., Lyubovitskij, V. E., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Balestra, F., Mamon, S. A., Marianski, B., Martin, A., Marzec, J., Matoušek, J., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Yu. V., Ball, M., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Moretti, A., Nagaytsev, A., Neyret, D., Nový, J., Nowak, W.-D., Nukazuka, G., Barth, J., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J.-C., Pereira, F., Pešek, M., Barone, V., Pešková, M., Peshekhonov, D. V., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, Jörg, Quaresma, M., Quintans, C., Ramos, S., Beck, R., Regali, C., Reicherz, G., Riedl, C., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Sarkar, S., Bedfer, Y., Savin, I. A., Sawada, T., Sbrizzai, G., Schiavon, P., Schmieden, H., Seder, E., Selyunin, A., Silva, L., Sinha, L., Sirtl, S., Bernhard, J., Slunecka, M., Smolik, J., Sozzi, F., Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Szabelski, A., Bicker, K., Szameitat, T., Sznajder, P., Tasevsky, M., Tessaro, S., Tessarotto, F., Thiel, A., Tomsa, J., Tosello, F., Tskhay, V., Uhl, S., Alexeev, G. D., Bielert, E. R., Vasilishin, B. I., Vauth, A., Veit, B. M., Veloso, J., Vidon, A., Virius, M., Wagner, M., Wallner, S., Wilfert, M., Zaremba, K., Bodlak, M., Zavada, P., Zavertyaev, M., Zhao, Y., Zemlyanichkina, E., Ziembicki, M., Bordalo, P., Bradamante, F., Bressan, A., Büchele, M., Burtsev, V. E., Chang, W.-C., Chatterjee, C., Chiosso, M., Amoroso, A., Chumakov, A. G., Chung, S.-U., Cicuttin, A., Crespo, M. L., Dalla Torre, S., Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Dhara, L., Donskov, S. V., Andrieux, V., Doshita, N., Dreisbach, Ch., Dünnweber, W., Dusaev, R. R., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P. D., Faessler, M., Ferrero, A., Anfimov, N. V., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, N., Friedrich, J. M., Frolov, V., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Anosov, V., Giarra, J., Gnesi, I., Gorzellik, M., Grasso, A., Gridin, A., Grosse-Perdekamp, M., Grube, B., Guskov, A., Hahne, D., Hamar, G., Antoshkin, A., von Harrach, D., Heitz, R., Herrmann, F., Horikawa, N., d'Hose, N., Hsieh, C.-Y., Huber, S., Ishimoto, S., Ivanov, A., Iwata, T., Augsten, K., Jandek, M., Jary, V., Joosten, R., Jörg, P., Juraskova, K., Kabuß, E., Kaspar, F., Kerbizi, A., Ketzer, B., Khaustov, G. V., Augustyniak, W., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., and Kouznetsov, O. M.
Subjects: Nuclear Theory, lcsh:QC770-798, ddc:530, High Energy Physics::Experiment, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Nuclear Experiment
Abstract: Nuclear physics 940, 34-53 (2019). doi:10.1016/j.nuclphysb.2018.12.024, Published by North-Holland Publ. Co., Amsterdam
Published: 2019

5. Measurement of P T -weighted Sivers asymmetries in leptoproduction of hadrons

Author: 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., Badełek, B., Balestra, F., Ball, M., Barth, J., Barone, V., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E.R., Bodlak, M., Bordalo, P., Bradamante, F., Bressan, A., Büchele, 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.Yu., Dhara, L., Donskov, S.V., Doshita, N., Dreisbach, Ch., Dünnweber, W., Dusaev, R.R., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P.D., Faessler, M., Ferrero, A., Finger, M., Finger, Michael, Jr., 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., Jandek, M., Jary, V., Joosten, R., Jörg, P., Juraskova, K., Kabuß, E., Kaspar, F., 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., Kveton, A., Lednev, A.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., Marianski, B., Martin, A., Marzec, J., Matoušek, J., Matsuda, T., Meshcheryakov, G.V., Meyer, M., Meyer, W., Mikhailov, Yu.V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Moretti, A., Nagaytsev, A., 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., 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., Smolik, J., Sozzi, F., 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., Wagner, M., Wallner, S., Wilfert, M., Zaremba, K., Zavada, P., Zavertyaev, M., Zhao, Y., Zemlyanichkina, E., Ziembicki, M., 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., Badełek, B., Balestra, F., Ball, M., Barth, J., Barone, V., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E. R., Bodlak, M., Bordalo, P., Bradamante, F., Bressan, A., Büchele, 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. Yu., Dhara, L., Donskov, S. V., Doshita, N., Dreisbach, Ch., Dünnweber, W., Dusaev, R. R., Dziewiecki, M., Efremov, A., Elia, C., 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., Jandek, M., Jary, V., Joosten, R., Jörg, P., Juraskova, K., Kabuß, E., Kaspar, F., 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., Kveton, A., Lednev, A. 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., Marianski, B., Martin, A., Marzec, J., Matoušek, J., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Yu. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Moretti, A., Nagaytsev, A., 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., 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., Smolik, J., Sozzi, F., 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., Wagner, M., Wallner, S., Wilfert, M., Zaremba, K., Zavada, P., Zavertyaev, M., Zhao, Y., Zemlyanichkina, E., 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: Nuclear and High Energy Physics, Nuclear Theory, FOS: Physical sciences, hadron: transverse momentum, COMPASS, fragmentation function, High Energy Physics - Experiment, hadron: leptoproduction, p: target, Sivers function, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], polarization: transverse, Nuclear Experiment, spin: transverse, Particle Physics - Phenomenology, hep-ex, hep-ph, distribution function: transverse momentum dependence, semi-inclusive reaction, High Energy Physics - Phenomenology, spin: asymmetry: measured, nucleon: spin, High Energy Physics::Experiment, quark: polarization, Particle Physics - Experiment
Abstract: The transverse spin asymmetries measured in semi-inclusive leptoproduction of hadrons, when weighted with the hadron transverse momentum $P_T$, 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 $P_T$-weighted Sivers asymmetries, which are both proportional to the product of the firsttransverse 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., Comment: 23 pages, 12 figures
Published: 2019

6. Odd and even partial waves of $\eta\pi^-$ and $\eta'\pi^-$ in $\pi^-p\to\eta^{(\prime)}\pi^-p$ at $191\,\textrm{GeV}/c$

Author: Adolph, C., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Badelek, B., Balestra, F., Barth, J., Baum, G., Beck, R., Bedfer, Y., Berlin, A., Bernhard, J., Bicker, K., Bielert, E. R., Bieling, J., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, A., Buechele, M., Burtin, E., Capozza, L., Chiosso, M., Chung, S. U., Cicuttin, A., Crespo, M. L., Curiel, Q., Torre, S. Dalla, Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Donskov, S. V., Doshita, N., Duic, V., Duennweber, W., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Filin, A., Finger, M., Finger jr., M., Fischer, H., Franco, C., von Hohenesche, N. du Fresne, Friedrich, J. M., Frolov, V., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Geyer, R., Gnesi, I., Gobbo, B., Goertz, S., Gorzellik, M., Grabmueller, S., Grasso, A., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., von Harrach, D., Hahne, D., Hashimoto, R., Heinsius, F. H., Herrmann, F., Hinterberger, F., Hoeppner, Ch., Horikawa, N., d'Hose, N., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu., Iwata, T., Jahn, R., Jary, V., Jasinski, P., Joerg, P., Joosten, R., Kabuss, E., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O., Kraemer, M., Kroumchtein, Z. V., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, S., Lichtenstadt, J., Maggiora, A., Magnon, A., Makke, N., Mallot, G. K., Marchand, C., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Yu. V., Miyachi, Y., Nagaytsev, A., Nagel, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Novy, J., Nowak, W. -D., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Peshekhonov, D. V., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Rocco, E., Rossiyskaya, N. S., Ryabchikov, D. I., Rychter, A., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, P., Schill, C., Schlueter, T., Schmidt, K., Schmieden, H., Schoenning, K., Schopferer, S., Schott, M., Shevchenko, O. Yu., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sosio, S., Sozzi, F., Srnka, A., Steiger, L., Stolarski, M., Sulc, M., Sulej, R., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, S., ter Wolbeek, J., Tessaro, S., Tessarotto, F., Thibaud, F., Uhl, S., Uman, I., Virius, M., Wang, L., Weisrock, T., Wilfert, M., Windmolders, R., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., and Zink, A.
Subjects: Nuclear and High Energy Physics, +p+eta+pi%22">pi- p --> p eta pi, eta: exclusive production, mass spectrum: (eta pi-), (eta pi-) [mass spectrum], M012:Desig=3, M012:Desig=8, M012M3, QC1-999, mass spectrum: (eta(958) pi-), angular momentum, COMPASS, electroproduction [eta(958)], High Energy Physics - Experiment, Physik, Desig=8 [M012], pi- p: inelastic scattering, ddc:530, M017M, Nuclear Experiment, a2(1320), M012W3, 191 GeV/c, exclusive production [eta], Desig=3 [M012], a4(2040), M017W, Physics, (eta(958) pi-) [mass spectrum], partial wave analysis, CERN SPS, eta(958): electroproduction, M017:Desig=3, QCD, resonance, non qbarq states, ddc, M017:Desig=4, Desig=4 [M017], High Energy Physics::Experiment, inelastic scattering [pi- p], Particle Physics - Experiment, Desig=3 [M017], experimental results
Abstract: Exclusive production of $\eta\pi^-$ and $\eta'\pi^-$ has been studied with a $191\,\textrm{GeV}/c$ $\pi^-$ beam impinging on a hydrogen target at COMPASS (CERN). Partial-wave analyses reveal different odd/even angular momentum ($L$) characteristics in the inspected invariant mass range up to $3\,\textrm{GeV}/c^2$. A striking similarity between the two systems is observed for the $L=2,4,6$ intensities (scaled by kinematical factors) and the relative phases. The known resonances $a_2(1320)$ and $a_4(2040)$ are in line with this similarity. In contrast, a strong enhancement of $\eta'\pi^-$ over $\eta\pi^-$ is found for the $L=1,3,5$ waves, which carry non-$q\bar q$ quantum numbers. The $L=1$ intensity peaks at $1.7\,\textrm{GeV}/c^2$ in $\eta'\pi^-$ and at $1.4\,\textrm{GeV}/c^2$ in $\eta\pi^-$, the corresponding phase motions with respect to $L=2$ are different., Comment: 16 pages, 5 figures and 1 table
Published: 2020
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7. Spin Density Matrix Elements in Exclusive $��$ Meson Muoproduction $^*$

Author: Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, 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., 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., Duennweber, 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, T., Joosten, R., Joerg, P., 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., Matousek, 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., Novy, J., Nowak, W. -D., Nukazuka, G., Nunes, A. S., Olshevskiy, A. G., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Pekeler, H., Peng, J. -C., Pesek, M., Peshekhonov, D. V., Peskova, 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: High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment
Abstract: We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $��$ meson muoproduction on the proton at COMPASS using 160 GeV/$c$ polarised $ ��^{+}$ and $ ��^{-}$ beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/$c^2$ $< W, 31 pages, 12 figures, 1 appendix
Published: 2020
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8. Transverse-momentum-dependent Multiplicities of Charged Hadrons in Muon-Deuteron Deep Inelastic Scattering

Author: Aghasyan, M., 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., Badelek, 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., Buechele, M., Burtsev, V. E., Capozza, L., Chang, W. -C., Chatterjee, C., Chiosso, M., Choi, I., Chumakov, A. G., Chung, S. -U., Cicuttin, A., Crespo, M. L., Curiel, Q., Torre, S. Dalla, Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Dhara, L., Donskov, S. V., Doshita, N., Dreisbach, Ch., Duennweber, W., Dusaev, R. R., Dziewiecki, M., Efremov, A., Eversheim, P. D., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., von Hohenesche, N. du Fresne, Friedrich, J. M., Frolov, V., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Giordano, F., Gnesi, I., Gorzellik, M., Grasso, A., Gridin, A., Perdekamp, M. Grosse, Grube, B., Grussenmeyer, T., Guskov, A., Hahne, D., Hamar, G., von Harrach, D., Heinsius, F. H., Heitz, R., Herrmann, F., Horikawa, N., d'Hose, N., Hsieh, C. -Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu., Iwata, T., Jary, V., Joosten, R., Joerg, 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., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Kral, Z., Kraemer, M., Kremser, P., 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., Levillain, M., 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., Marianski, B., Martin, A., Marzec, J., Matousek, 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., Novy, 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., Pesek, M., Peskova, 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., Rogacheva, N. S., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, G., Schiavon, P., Schmidt, K., Schmieden, H., Schoenning, K., Seder, E., Selyunin, A., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., 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., Veloso, J., Vidon, A., Virius, M., Wallner, S., Weisrock, T., Wilfert, M., ter Wolbeek, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Zhuravlev, N., 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, COMPASS, Aghasyan, M., 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., Choi, I., 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., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Giordano, F., Gnesi, I., Gorzellik, M., Grasso, A., Gridin, A., Grosse Perdekamp, M., Grube, B., Grussenmeyer, T., Guskov, A., Hahne, D., Hamar, G., von Harrach, D., Heinsius, F. H., 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., Königsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Kral, Z., Krämer, M., Kremser, P., 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., Levillain, M., 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., 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., 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., Rogacheva, N. S., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, G., Schiavon, P., Schmidt, K., Schmieden, H., Schönning, K., Seder, E., Selyunin, A., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., 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., Veloso, J., Vidon, A., Virius, M., Wallner, S., Weisrock, T., Wilfert, M., ter Wolbeek, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), and Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay
Subjects: CERN Lab, ComputerSystemsOrganization_COMPUTERSYSTEMIMPLEMENTATION, MULTIPLICITIES, dimension: 3, PT DEPENDENT, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, FOS: Physical sciences, ComputerApplications_COMPUTERSINOTHERSYSTEMS, target: isoscalar, muon deuteron: deep inelastic scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, transverse momentum dependence, hadron: transverse momentum, SIDIS, COMPASS, GeneralLiterature_MISCELLANEOUS, High Energy Physics - Experiment, scaling: Bjorken, Subatomär fysik, charged particle: multiplicity, High Energy Physics - Experiment (hep-ex), [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], mass: hadronic, Subatomic Physics, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Physics - Experiment, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), quantum chromodynamics: perturbation theory, Nuclear Experiment, DIS, hep-ex, hadron: multiplicity, effect: nonperturbative, perturbation theory: higher-order, CERN SPS, photon: energy, semi-inclusive reaction, ComputingMethodologies_PATTERNRECOGNITION, kinematics, High Energy Physics::Experiment, Particle Physics - Experiment, experimental results, photon: virtual
Abstract: A semi-inclusive measurement of charged hadron multiplicities in deep inelastic muon scattering off an isoscalar target was performed using data collected by the COMPASS Collaboration at CERN. The following kinematic domain is covered by the data: photon virtuality $Q^{2}>1$ (GeV/$c$)$^2$, invariant mass of the hadronic system $W > 5$ GeV/$c^2$, Bjorken scaling variable in the range $0.003 < x < 0.4$, fraction of the virtual photon energy carried by the hadron in the range $0.2 < z < 0.8$, square of the hadron transverse momentum with respect to the virtual photon direction in the range 0.02 (GeV/$c)^2 < P_{\rm{hT}}^{2} < 3$ (GeV/$c$)$^2$. The multiplicities are presented as a function of $P_{\rm{hT}}^{2}$ in three-dimensional bins of $x$, $Q^2$, $z$ and compared to previous semi-inclusive measurements. We explore the small-$P_{\rm{hT}}^{2}$ region, i.e. $P_{\rm{hT}}^{2} < 1$ (GeV/$c$)$^2$, where hadron transverse momenta are expected to arise from non-perturbative effects, and also the domain of larger $P_{\rm{hT}}^{2}$, where contributions from higher-order perturbative QCD are expected to dominate. The multiplicities are fitted using a single-exponential function at small $P_{\rm{hT}}^{2}$ to study the dependence of the average transverse momentum $\langle P_{\rm{hT}}^{2}\rangle$ on $x$, $Q^2$ and $z$. The power-law behaviour of the multiplicities at large $P_{\rm{hT}}^{2}$ is investigated using various functional forms. The fits describe the data reasonably well over the full measured range., 28 pages, 20 figures
Published: 2018

9. First Measurement of Transverse-Spin-Dependent Azimuthal Asymmetries in the Drell-Yan Process

Author: Aghasyan, M., Akhunzyanov, R., Alexeev, G. D., Alexeev, M. G., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Antoshkin, A., Augsten, K., Augustyniak, W., Austregesilo, A., Azevedo, C. D. R., Badelek, 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., Buchele, M., Cchang, W. -C, Chatterjee, C., Chiosso, M., Choi, I., Chung, S. -U, Cicuttin, A., Crespo, M. L., Dalla Torre, S., Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Dhara, L., Donskov, S. V., Doshita, N., Dreisbach, Ch., Duennweber, W., Dziewiecki, M., Efremov, A., Eversheim, P. D., Faessler, M., Ferrero, A., Finger, M., Finger, M., Jr., Fischer, H., Franco, C., von Hohenesche, N. du Fresne, Friedrich, J. M., Frolov, V., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Giordano, F., Gnesi, I., Gorzellik, M., Grasso, A., Perdekamp, M. Grosse, Grube, B., Grussenmeyer, T., Guskov, A., Hahne, D., Hamar, G., von Harrach, D., Heinsius, F. H., Heitz, R., Herrmann, F., Horikawa, N., d'Hose, N., Hsieh, C. -Y, Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu., Iwata, T., Jary, V., Joosten, R., Joerg, 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., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Kral, Z., Kraemer, M., Kremser, P., Krinner, F., Kroumchtein, Z. V., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Kveton, A., Lednev, A. A., Levillain, M., Levorato, S., Lian, Y. -S, Lichtenstadt, J., Longo, R., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Marianski, B., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Yu. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Nagaytsev, A., Nerling, F., Neyret, D., Novy, 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., Pesek, 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., Rogacheva, N. S., Roskot, M., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, G., Schiavon, P., Schmidt, K., Schmieden, H., Schönning, Karin, Seder, E., Selyunin, A., Shevchenko, O. Yu., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Smolik, J., Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takewaka, S., Tasevsky, M., Tessaro, S., Terca, G., Tessarotto, F., Thiel, A., Tomsa, J., Tosello, F., Tskhay, V., Uhl, S., Vauth, A., Veloso, J., Virius, M., Vit, M., Vondra, J., Wallner, S., Weisrock, T., Wilfert, M., ter Wolbeek, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Zhuravlev, N., Ziembicki, M., Aghasyan, M., Akhunzyanov, R., Alexeev, G. D., Alexeev, M. G., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Antoshkin, A., Augsten, K., Augustyniak, W., Austregesilo, A., Azevedo, C. D. R., BadeÅ‚ek, 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., Bã¼chele, M., Chang, W. -. C., Chatterjee, C., Chiosso, M., Choi, I., Chung, S. -. U., Cicuttin, A., Crespo, M. L., Dalla Torre, S., Dasgupta, S. S., Dasgupta, S., Denisov, O. Y. u., Dhara, L., Donskov, S. V., Doshita, N., Dreisbach, C. h., Dã¼nnweber, W., 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., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Giordano, F., Gnesi, I., Gorzellik, M., Grasso, A., Grosse Perdekamp, M., Grube, B., Grussenmeyer, T., Guskov, A., Hahne, D., Hamar, G., Von Harrach, D., Heinsius, F. H., Heitz, R., Herrmann, F., Horikawa, N., D'Hose, N., Hsieh, C. -. Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y. u., Iwata, T., Jary, V., Joosten, R., Jã¶rg, P., Kabuãÿ, E., Kerbizi, A., Ketzer, B., Khaustov, G. V., Khokhlov, Y. u. A., Kisselev, Y. u., Klein, F., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Kã¶nigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Kral, Z., Krã¤mer, M., Kremser, P., Krinner, F., Kroumchtein, Z. V., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Kveton, A., Lednev, A. A., Levillain, M., Levorato, S., Lian, Y. -. S., Lichtenstadt, J., Longo, R., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Marianski, B., Martin, A., Marzec, J., Matouå¡ek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Y. u. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Nagaytsev, A., Nerling, F., Neyret, D., Novã½, 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., Peå¡ek, 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., Rogacheva, N. S., Roskot, M., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, G., Schiavon, P., Schmidt, K., Schmieden, H., Schã¶nning, K., Seder, E., Selyunin, A., Shevchenko, O. Y. u., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Smolik, J., Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takewaka, S., Tasevsky, M., Tessaro, S., Terã§a, G., Tessarotto, F., Thiel, A., Tomsa, J., Tosello, F., Tskhay, V., Uhl, S., Vauth, A., Veloso, J., Virius, M., Vit, M., Vondra, J., Wallner, S., Weisrock, T., Wilfert, M., Ter Wolbeek, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Zhuravlev, N., 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, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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, and Commissariat à l'énergie atomique et aux énergies alternatives ( CEA )
Subjects: Drell-Yan process, ComputerSystemsOrganization_COMPUTERSYSTEMIMPLEMENTATION, Nuclear Theory, General Physics and Astronomy, parton: distribution function, transverse momentum dependence, 01 natural sciences, COMPASS, High Energy Physics - Experiment, Sivers function, High Energy Physics - Experiment (hep-ex), semi-inclusive reaction [deep inelastic scattering], High Energy Physics - Phenomenology (hep-ph), ddc:550, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment, transversity, Physics, Quantum chromodynamics, (muon+ muon-) [mass spectrum], Large Hadron Collider, deep inelastic scattering: semi-inclusive reaction, polarized target: transverse, 190 GeV/c, transverse [polarized target], nucleon, Drell–Yan process, hep-ph, dimuon: mass spectrum, Azimuth, High Energy Physics - Phenomenology, Transverse plane, asymmetry [angular distribution], pi- nucleus: scattering, mass spectrum [dimuon], distribution function [parton], Nucleon, spin: asymmetry, Particle Physics - Experiment, Particle physics, angular distribution: asymmetry, scattering [pi- nucleus], ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, FOS: Physical sciences, ComputerApplications_COMPUTERSINOTHERSYSTEMS, Accelerator Physics and Instrumentation, GeneralLiterature_MISCELLANEOUS, Nuclear physics, Physics and Astronomy (all), [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], 0103 physical sciences, quantum chromodynamics, universality, 010306 general physics, Particle Physics - Phenomenology, 010308 nuclear & particles physics, hep-ex, High Energy Physics::Phenomenology, Acceleratorfysik och instrumentering, CERN SPS, mass spectrum: (muon+ muon-), ComputingMethodologies_PATTERNRECOGNITION, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Physics::Accelerator Physics, [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, asymmetry [spin], experimental results
Abstract: The first measurement of transverse-spin-dependent azimuthal asymmetries in the pion-induced Drell-Yan (DY) process is reported. We use the CERN SPS 190 GeV/$c$, $\pi^{-}$ beam and a transversely polarized ammonia target. Three azimuthal asymmetries giving access to different transverse-momentum-dependent (TMD) parton distribution functions (PDFs) are extracted using dimuon events with invariant mass between 4.3 GeV/$c^2$ and 8.5 GeV/$c^2$. The observed sign of the Sivers asymmetry is found to be consistent with the fundamental prediction of Quantum Chromodynamics (QCD) that the Sivers TMD PDFs extracted from DY have a sign opposite to the one extracted from semi-inclusive deep-inelastic scattering (SIDIS) data. We present two other asymmetries originating from the pion Boer-Mulders TMD PDFs convoluted with either the nucleon transversity or pretzelosity TMD PDFs. These DY results are obtained at a hard scale comparable to that of a recent COMPASS SIDIS measurement and hence allow unique tests of fundamental QCD universality predictions., Comment: 11 pages, 6 figures
Published: 2017

10. Exclusive ω meson muoproduction on transversely polarised protons

Author: Adolph, C., Agarwala, J., Augustyniak, W., Kolosov, V. N., Kondo, K., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Kraemer, M., Kremser, P., Krinner, F., Austregesilo, A., Kroumchtein, Z. V., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, S., Lian, Y. -S., Azevedo, C. D. R., Lichtenstadt, J., Longo, R., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Marchand, C., Marianski, B., Martin, A., Badelek, B., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Michigami, T., Mikhailov, Yu. V., Mikhasenko, M., Balestra, F., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Montuenga, P., Nagaytsev, A., Nerling, F., Neyret, D., Nikolaenko, V. I., Novy, J., Nowak, W. -D., Barth, J., Nukazuka, G., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J. -C., Pereira, F., Beck, R., Pesek, M., Peshekhonov, D. V., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, Jörg, Quaresma, M., Quintans, C., Ramos, S., Bedfer, Y., Regali, C., Reicherz, G., Riedl, C., Roskot, M., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Bernhard, J., Santos, C., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, G., Schiavon, P., Schmidt, K., Schmieden, H., Schoenning, K., Schopferer, S., Bicker, K., Seder, E., Selyunin, A., Shevchenko, O. Yu., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Smolik, J., Sozzi, F., Srnka, A., Aghasyan, M., Bielert, E. R., Steffen, D., Stolarski, M., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, S., Tasevsky, M., Tessaro, S., Birsa, R., Tessarotto, F., Thibaud, F., Tosello, F., Tskhay, V., Uhl, S., Veloso, J., Virius, M., Vondra, J., Wallner, S., Weisrock, T., Bisplinghoff, J., Wilfert, M., ter Wolbeek, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., Zink, A., COMPASS Collaboration, Bodlak, M., Boer, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, A., Buechele, M., Akhunzyanov, R., Chang, W. -C., Chatterjee, C., Chiosso, M., Choi, I., Chung, S. -U., Cicuttin, A., Crespo, M. L., Curiel, Q., Dalla Torre, S., Dasgupta, S. S., Alexeev, M. G., Dasgupta, S., Denisov, O. Yu., Dhara, L., Donskov, S. V., Doshita, N., Duic, V., Duennweber, W., Dziewiecki, M., Efremov, A., Eversheim, P. D., Alexeev, G. D., Eyrich, W., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, Nicolas, Friedrich, J. M., Frolov, V., Fuchey, E., Amoroso, A., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giordano, F., Gnesi, I., Gorzellik, M., Grabmueller, S., Grasso, A., Grosse-Perdekamp, M., Grube, B., Andrieux, V., Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., von Harrach, D., Hashimoto, R., Heinsius, F. H., Heitz, R., Herrmann, F., Hinterberger, F., Anfimov, N. V., Horikawa, N., d'Hosev, N., Hsieh, C. -Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu., Iwata, T., Jahn, R., Jary, V., Anosov, V., Joosten, R., Joerg, P., Kabuss, E., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Adolph, C., Aghasyan, M., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Augustyniak, W., Austregesilo, A., Azevedo, C. D. R., Badełek, B., Balestra, F., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E. R., Birsa, Renato, Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, Franco, Braun, C., Bressan, Andrea, Büchele, M., Chang, W. C., Chatterjee, Chandradoy, Chiosso, M., Choi, I., Chung, S. U., Cicuttin, A., Crespo, M. L., Curiel, Q., Dalla Torre, S., Dasgupta, SHUDDHA SHANKAR, Dasgupta, S., Denisov, O. Y. u., Dhara, L., Donskov, S. V., Doshita, N., Duic, Venicio, Dünnweber, W., Dziewiecki, M., Efremov, A., Eversheim, P. D., Eyrich, W., 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., Giordano, F., Gnesi, I., Gorzellik, M., Grabmüller, S., Grasso, A., Grosse Perdekamp, M., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., von Harrach, D., Hashimoto, R., Heinsius, F. H., Heitz, R., Herrmann, F., Hinterberger, F., Horikawa, N., D'Hose, N., Hsieh, C. Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y. u., Iwata, T., Jahn, R., Jary, V., Joosten, R., Jörg, P., Kabuß, E., Ketzer, B., Khaustov, G. V., Khokhlov, Y. u. A., Kisselev, Y. u., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Krämer, M., Kremser, P., Krinner, F., Kroumchtein, Z. V., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, Stefano, Lian, Y. S., Lichtenstadt, J., Longo, R., Maggiora, A., Magnon, A., Makins, N., Makke, Nour, Mallot, G. K., Marchand, C., Marianski, B., Martin, Anna, Marzec, J., Matousek, Jan, Matsuda, H., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Michigami, T., Mikhailov, Y. u. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Montuenga, P., Nagaytsev, A., Nerling, F., Neyret, D., Nikolaenko, V. I., 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., Pešek, 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., Roskot, M., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, Giulio, Schiavon, Paolo, Schmidt, K., Schmieden, H., Schönning, K., Schopferer, S., Seder, E., Selyunin, A., Shevchenko, O. Y. u., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Smolik, J., Sozzi, Federica, Srnka, A., Steffen, D., Stolarski, M., Sulc, M., Suzuki, H., Szabelski, Adam, Szameitat, T., Sznajder, P., Takekawa, Stefano, Tasevsky, M., Tessaro, Susanna, Tessarotto, F., Thibaud, F., Tosello, F., Tskhay, V., Uhl, S., Veloso, J., Virius, M., Vondra, J., Wallner, S., Weisrock, T., Wilfert, M., ter Wolbeek, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., and Zink, A.
Subjects: helicity [nucleon], Nuclear and High Energy Physics, generalized parton distribution, COMPASS, nuclear reaction [muon nucleus], transition [form factor], lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, ddc:530, Nuclear Experiment, transversity, transverse momentum [omega(783)], angular momentum [quark], 160 GeV/c, High Energy Physics::Phenomenology, momentum transfer, photon, transverse [polarized target], scattering [muon+ p], Bjorken [scaling], asymmetry [angular distribution], lcsh:QC770-798, exclusive production [omega(783)], leptoproduction [omega(783)], High Energy Physics::Experiment, distribution function [parton], asymmetry [spin], experimental results
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

11. Longitudinal double-spin asymmetry $A_1^{\rm p}$ and spin-dependent structure function $g_1^{\rm p}$ of the proton at small values of $x$ and $Q^2$

Author: Aghasyan, M., 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., Badelek, 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., Buechele, M., Burtsev, V. E., Chang, W. -C., Chatterjee, C., Chiosso, M., Choi, I., Chumakov, A. G., Chung, S. -U., Cicuttin, A., Crespo, M. L., Torre, S. Dalla, Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Dhara, L., Donskov, S. V., Doshita, N., Dreisbach, Ch., Duennweber, W., Dusaev, R. R., Dziewiecki, M., Efremov, A., Eversheim, P. D., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., von Hohenesche, N. du Fresne, Friedrich, J. M., Frolov, V., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Giordano, F., Gnesi, I., Gorzellik, M., Grasso, A., Gridin, A., Perdekamp, M. Grosse, Grube, B., Grussenmeyer, T., Guskov, A., Hahne, D., Hamar, G., von Harrach, D., Heinsius, F. H., Heitz, R., Herrmann, F., Horikawa, N., d'Hose, N., Hsieh, C. -Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu., Iwata, T., Jary, V., Joosten, R., Joerg, 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., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Kral, Z., Kraemer, M., Kremser, P., 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., Levillain, M., 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., Marianski, B., Martin, A., Marzec, J., Matousek, 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., Novy, 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., Pesek, M., Peskova, 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., Rogacheva, N. S., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, G., Schiavon, P., Schmidt, K., Schmieden, H., Schoenning, K., Seder, E., Selyunin, A., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., 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., Veloso, J., Vidon, A., Virius, M., Wallner, S., Weisrock, T., Wilfert, M., ter Wolbeek, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Zhuravlev, N., 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, Laboratoire AIM, Université Paris Diderot - Paris 7 ( UPD7 ) -Centre d'Etudes de 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, Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), and Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112))
Subjects: small-x, CERN Lab, [formula omitted], FOS: Physical sciences, sum rule: Bjorken, structure function: spin, spin: dependence, COMPASS, beam: energy, High Energy Physics - Experiment, x-dependence, High Energy Physics - Experiment (hep-ex), p: spin, momentum transfer: low, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], p: structure function, Nuclear Experiment, A1, hep-ex, muon: beam, spin: effect, photon, Inelastic muon scattering, CERN SPS, Low [formula omitted], Low Q2, Low x, Spin structure function, g1, muon p: deep inelastic scattering, Physics::Accelerator Physics, High Energy Physics::Experiment, nucleon: spin, muon: polarized beam, spin: longitudinal, statistical, spin: asymmetry, Particle Physics - Experiment, experimental results
Abstract: We present a precise measurement of the proton longitudinal double-spin asymmetry $A_1^{\rm p}$ and the proton spin-dependent structure function $g_1^{\rm p}$ at photon virtualities $0.006~({\rm GeV}/c)^2, Comment: 19 pages, 7 figures
Published: 2018

12. Search for muoproduction of $X (3872)$ at COMPASS and indication of a new state $\widetilde{X}(3872)$

Author: COMPASS Collaboration, Aghasyan, M., Augsten, K., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Kral, Z., Krämer, M., Kremser, P., Krinner, F., Augustyniak, W., Kroumchtein, Z. V., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Kuznetsov, I. I., Kveton, A., Lednev, A. A., Levchenko, E. A., Levillain, M., Austregesilo, A., Levorato, S., Lian, Y.-S., Lichtenstadt, J., Longo, R., Lyubovitskij, V. E., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Azevedo, C. D. R., Mamon, S. A., Marianski, B., Martin, A., Marzec, J., Matoušek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Badełek, B., Mikhailov, Yu. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Nagaytsev, A., Nerling, F., Neyret, D., Nový, J., Nowak, W.-D., Balestra, F., Nukazuka, G., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J.-C., Pereira, F., Ball, M., Pešek, M., Pešková, M., Peshekhonov, D. V., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, Jörg, Quaresma, M., Quintans, C., Barth, J., Ramos, S., Regali, C., Reicherz, G., Riedl, C., Rogacheva, N. S., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Beck, R., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, G., Schiavon, P., Schmidt, K., Schmieden, H., Schönning, K., Bedfer, Y., Seder, E., Selyunin, A., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Smolik, J., Srnka, A., Steffen, D., Stolarski, M., Akhunzyanov, R., Bernhard, J., Subrt, O., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Tasevsky, M., Tessaro, S., Tessarotto, F., Thiel, A., Bicker, K., Tomsa, J., Tosello, F., Tskhay, V., Uhl, S., Vasilishin, B. I., Vauth, A., Veloso, J., Vidon, A., Virius, M., Wallner, S., Bielert, E. R., Weisrock, T., Wilfert, M., ter Wolbeek, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Zhuravlev, N., Ziembicki, M., Birsa, R., Bodlak, M., Bordalo, P., Bradamante, F., Bressan, A., Büchele, M., Burtsev, V. E., Alexeev, M. G., Chang, W.-C., Chatterjee, C., Chiosso, M., Choi, I., Chumakov, A. G., Chung, S.-U., Cicuttin, A., Crespo, M. L., Dalla Torre, S., Dasgupta, S. S., Alexeev, G. D., Dasgupta, S., Denisov, O. Yu., Dhara, L., Donskov, S. V., Doshita, N., Dreisbach, Ch., Dünnweber, W., Dusaev, R. R., Dziewiecki, M., Efremov, A., Amoroso, A., Eversheim, P. D., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., du Fresne von Hohenesche, N., Friedrich, J. M., Frolov, V., Andrieux, V., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Giordano, F., Gnesi, I., Gorzellik, M., Grasso, A., Gridin, A., Anfimov, N. V., Grosse-Perdekamp, M., Grube, B., Grussenmeyer, T., Guskov, A., Hahne, D., Hamar, G., von Harrach, D., Heinsius, F. H., Heitz, R., Herrmann, F., Anosov, V., Horikawa, N., d'Hose, N., Hsieh, C.-Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu., Iwata, T., Jary, V., Joosten, R., Antoshkin, A., Jörg, P., Kabuß, E., Kerbizi, A., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Koivuniemi, J. H., Kolosov, V. N., 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: two-pion [mass spectrum], muon nucleus: exclusive reaction, FOS: Physical sciences, leptoproduction [X(3872)], COMPASS, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), X(3872), hadronic decay [X(3872)], mass spectrum: two-pion, Tetraquark, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], ddc:530, X(3872): hadronic decay, muon+: beam, Nuclear Experiment, muon+ nucleus: scattering, M176M, hep-ex, X(3872): leptoproduction, beam [muon+], CERN SPS, exclusive production, channel cross section: branching ratio: measured, Photoproduction, +J%2Fpsi%283100%29+2pi%22">X(3872) --> J/psi(3100) 2pi, branching ratio: measured [channel cross section], exclusive reaction [muon nucleus], High Energy Physics::Experiment, Exotic charmonia, scattering [muon+ nucleus], hadron, statistical, Particle Physics - Experiment, experimental results
Abstract: We have searched for exclusive production of exotic charmonia in the reaction $\mu^+~N \rightarrow \mu^+ (J\!/\!\psi\pi^+\pi^-)\pi^{\pm}~N'$ using COMPASS data collected with incoming muons of 160 GeV/$c$ and 200 GeV/$c$ momentum. In the $J\!/\!\psi\pi^+\pi^-$ mass distribution we observe a signal with a statistical significance of 4.1 $\sigma$. Its mass and width are consistent with those of the $X(3872)$. The shape of the $\pi^+\pi^-$ mass distribution from the observed decay into $J\!/\!\psi\pi^+\pi^-$ 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 $J\!/\!\psi\pi^+\pi^-$ is determined to be 71$\pm$28(stat)$\pm$39(syst) pb., Comment: 12 pages, 6 figures
Published: 2018

13. Letter of Intent: A New QCD facility at the M2 beam line of the CERN SPS

Author: Adams, B., Aidala, C.A., Akhunzyanov, R., Alexeev, G.D., Alexeev, M.G., Amoroso, A., Andrieux, V., Anfimov, N.V., Anosov, V., Antoshkin, A., Augsten, K., Augustyniak, W., Azevedo, C.D.R., Azhibekov, A., Badełek, B., Balestra, F., Ball, M., Barth, J., Beck, R., Bedfer, Y., Berenguer Antequera, J., Bernauer, J.C., Bernhard, J., Bodlak, M., Bordalo, P., Bradamante, F., Bressan, A., Büchele, M., Burtsev, V.E., Chang, W.-C., Chatterjee, C., Chen, X., Chiosso, M., Chumakov, A.G., Chung, S.-U., Cicuttin, A., Correia, P., Crespo, M.L., Dalla Torre, S., Dasgupta, S.S., Dasgupta, S., Dashyan, N., Denisenko, I., Denisov, O.Yu., Dhara, L., d'Hose, N., Donato, F., Donskov, S.V., Doshita, N., Dreisbach, Ch., Dünnweber, W., Dusaev, R.R., Dziewiecki, M., Dzyuba, A., Efremov, A., Egelhof, P., Elagin, A., Eversheim, P.D., Faessler, M., Fedotova, J., Ferrero, A., Finger, M., Finger, Michael, Jr., Fischer, H., Franco, C., Friedrich, J.M., Frolov, V., Futch, A., Gautheron, F., Gavrichtchouk, O.P., Gerassimov, S., Gevorkyan, S., Ghandilyan, Y., Giarra, J., Gnesi, I., Gorzellik, M., Grasso, A., Gridin, A., Grosse Perdekamp, M., Grube, B., Gushterski, R.I., Guskov, A., Hahne, D., Hamar, G., von Harrach, D., He, X., Heitz, R., Herrmann, F., Horikawa, N., Hsieh, C.-Y., Huber, S., Inglessi, A., Ilyichev, A., Isataev, T., Ishimoto, S., Ivanov, A., Ivanov, N., Ivanshin, Yu., Iwata, T., Jandek, M., Jary, V., Jen, C.-M., Joosten, R., Jörg, P., Juraskova, K., Kabuß, E., Kabyshev, A., Kaspar, F., Kerbizi, A., Ketzer, B., Khaustov, G.V., Khokhlov, Yu.A., Kim, M., Kiselev, O., Kisselev, Yu., Klein, F., Koivuniemi, J.H., Kolosov, V.N., Kondo, 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., Kuterbekov, K., Kuznetsov, I.I., Kveton, A., Levchenko, E.A., Levorato, S., Lian, Y.-S., Liang, Y., Lichtenstadt, J., Lin, P.-J., Liu, K., Liu, M.X., Longo, R., Lorenzon, W., Losekamm, M., Lyubovitskij, V.E., Maev, E., Maggiora, A., Magnon, A., Makarenko, V., Makins, N., Makke, N., Mallot, G.K., Maltsev, A., Mamon, S.A., Marianski, B., Martin, A., Marukyan, H., Marzec, J., Masi, N., Matoušek, J., Matsuda, H., Mattson, G., Meshcheryakov, G.V., Meyer, W., Meyer, M., Mikhailov, Yu.V., Mikhasenko, M., Minot, M., Mitrofanov, E., Miyachi, Y., Moretti, A., Nagaytsev, A., Naim, C., Neyret, D., Nigmatkulov, G., Mkrtchyan, A., Mkrtchyan, H., Nový, J., Nowak, W.-D., Nozzoli, F., Nukazuka, G., Nunes, A.S., Olshevsky, A.G., Orlov, I., Osborn, J.D., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J.-C., Pereira, F., Peshekhonov, D.V., Pešek, M., Pešková, M., Pierre, N., Platchkov, S., Pochodzalla, J., Polyakov, V.A., Pöschi, T., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Raymond, R., Reicherz, G., Riedl, C., Ryabchikov, D.I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V.D., Sandacz, A., Sarkar, S., Sarsour, M., Savin, I.A., Sbrizzai, G., Schmieden, H., Seder, E., Selyunin, A., Simon, H., Sinha, L., Sirtl, S., Slunecka, M., Smolik, J., Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Szabelski, A., Sznajder, P., Tasevsky, M., Tchekhovski, V., Tessaro, S., Tessarotto, F., Thiel, A., Tomsa, J., Tosello, F., Tskhay, V., Uhl, S., Vasilishin, B.I., Vassiliev, A., Vauth, A., Veit, B.M., Ventura, B., Veloso, J., Vidon, A., Virius, M., Vorobyev, A., Wagner, M., Wallner, S., Wilfert, M., Xiao, Z., Xu, N., Yang, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Zhao, H., Zhao, Y., Zhuravlev, N., Ziembicki, M., and Zuccon, P.
Subjects: Physics::Instrumentation and Detectors, hep-ex, High Energy Physics::Lattice, Physics::Accelerator Physics, High Energy Physics::Experiment, Detectors and Experimental Techniques, Nuclear Experiment, physics.ins-det, Particle Physics - Experiment
Abstract: A New QCD facility at the M2 beam line of the CERN SPS COMPASS++/AMBER
Published: 2018

14. Search for muoproduction of X(3872) at COMPASS and indication of a new state (X)over-tilde(3872)

Author: Aghasyan, M., 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., Badelek, 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., Buechele, M., Burtsev, V. E., Chang, W. -C, Chatterjee, C., Chiosso, M., Choi, I., Chumakov, A. G., Chung, S. -U, Cicuttin, A., Crespo, M. L., Dalla Torre, S., Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Dhara, L., Donskov, S. V., Doshita, N., Dreisbach, Ch., Duennweber, W., Dusaev, R. R., Dziewiecki, M., Efremov, A., Eversheim, P. D., Faessler, M., Ferrero, A., Finger, M., Finger, M., Jr., Fischer, H., Franco, C., von Hohenesche, N. du Fresne, Friedrich, J. M., Frolov, V., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giarra, J., Giordano, F., Gnesi, I., Gorzellik, M., Grasso, A., Gridin, A., Perdekamp, M. Grosse, Grube, B., Grussenmeyer, T., Guskov, A., Hahne, D., Hamar, G., von Harrach, D., Heinsius, F. H., Heitz, R., Herrmann, F., Horikawa, N., d'Hose, N., Hsieh, C. -Y, Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu., Iwata, T., Jary, V., Joosten, R., Joerg, 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., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Kral, Z., Kraemer, M., Kremser, P., 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., Levillain, M., 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., Marianski, B., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Mikhailov, Yu. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Nagaytsev, A., Nerling, F., Neyret, D., Novy, 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., Pesek, M., Peskova, 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., Rogacheva, N. S., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, G., Schiavon, P., Schmidt, K., Schmieden, H., Schönning, Karin, Seder, E., Selyunin, A., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., 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., Veloso, J., Vidon, A., Virius, M., Wallner, S., Weisrock, T., Wilfert, M., ter Wolbeek, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Zhuravlev, N., and Ziembicki, M.
Subjects: Subatomär fysik, X(3872), Photoproduction, Tetraquark, Subatomic Physics, High Energy Physics::Experiment, Exotic charmonia, COMPASS
Abstract: We have searched for exclusive production of exotic charmonia in the reaction mu N+ -> mu(+)(J/psi pi(+)pi(-))pi N-+/-' using COMPASS data collected with incoming muons of 160 GeV/c and 200 GeV/c momentum. In the J/psi pi(vertical bar)pi mass distribution we observe a signal with a statistical significance of 4.1 sigma. Its mass and width are consistent with those of the X(3872). The shape of the pi(+)pi(-) mass distribution from the observed decay into J/psi pi(+)pi(-) 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/psi pi(+)pi(-) is determined to be 71 +/- 28(stat)+/- 39(syst) pb.
Published: 2018

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

Author: Adolph, C., Andrieux, V., Bedfer, Y., Boer, M., Burtin, E., Curiel, Q., D'Hose, N., Ferrero, A., Fuchey, E., Kunne, F., Levillain, M., Magnon, A., Marchand, C., Neyret, D., Platchkov, S., Thibault, F, Al., Et, Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and COMPASS Collaboration
Subjects: Nuclear Theory, High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: International audience; 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 160 GeV muon beam and an isoscalar target ((LiD)-Li-6). They cover the kinematic domain in the photon virtuality Q(2) > 1 (GeV/c) 2, 0.004 < x < 0.4, 0.2 < z < 0.85 and 0.1 < y < 0.7. In addition, a leading-order pQCD analysis was performed using the pion multiplicity results to extract quark fragmentation functions.
Published: 2017

16. Exclusive $\omega$ meson muoproduction on transversely polarised protons

Author: Adolph, C., Agarwala, J., Aghasyan, M., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Augustyniak, W., Austregesilo, A., Azevedo, C. D. R., Badelek, B., Balestra, F., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E. R., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, A., Buechele, M., Chang, W. -C., Chatterjee, C., Chiosso, M., Choi, I., Chung, S. -U., Cicuttin, A., Crespo, M. L., Curiel, Q., Torre, S. Dalla, Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Dhara, L., Donskov, S. V., Doshita, N., Duic, V., Duennweber, W., Dziewiecki, M., Efremov, A., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Finger, M., Finger jr., M., Fischer, H., Franco, C., von Hohenesche, N. du Fresne, Friedrich, J. M., Frolov, V., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giordano, F., Gnesi, I., Gorzellik, M., Grabmueller, S., Grasso, A., Perdekamp, M. Grosse, Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., von Harrach, D., Hashimoto, R., Heinsius, F. H., Heitz, R., Herrmann, F., Hinterberger, F., Horikawa, N., dHose, N., Hsieh, C. -Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu., Iwata, T., Jahn, R., Jary, V., Joosten, R., Joerg, P., Kabuss, E., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Kraemer, M., Kremser, P., Krinner, F., Kroumchtein, Z. V., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, S., Lian, Y. -S., Lichtenstadt, J., Longo, R., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Marchand, C., Marianski, B., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Michigami, T., Mikhailov, Yu. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Montuenga, P., Nagaytsev, A., Nerling, F., Neyret, D., Nikolaenko, V. I., Novy, 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., Pesek, 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., Roskot, M., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, G., Schiavon, P., Schmidt, K., Schmieden, H., Schoenning, K., Schopferer, S., Seder, E., Selyunin, A., Shevchenko, O. Yu., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Smolik, J., Sozzi, F., Srnka, A., Steffen, D., Stolarski, M., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, S., Tasevsky, M., Tessaro, S., Tessarotto, F., Thibaud, F., Tosello, F., Tskhay, V., Uhl, S., Veloso, J., Virius, M., Vondra, J., Wallner, S., Weisrock, T., Wilfert, M., ter Wolbeek, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., Zink, A., Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Observatoire de la Côte d'Azur (OCA), Centre National de la Recherche Scientifique (CNRS), COMPASS, Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) ( DPHN ), Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Observatoire de la Côte d'Azur ( OCA ), and Centre National de la Recherche Scientifique ( CNRS )
Subjects: Statistics::Theory, generalized parton distribution, angular distribution: asymmetry, muon nucleus: nuclear reaction, parton: distribution function, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, muon+ p: scattering, COMPASS, High Energy Physics - Experiment, scaling: Bjorken, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Physics - Experiment, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, omega(783): leptoproduction, transversity, form factor: transition, hep-ex, 160 GeV/c, quark: angular momentum, polarized target: transverse, photon, momentum transfer, omega(783): exclusive production, nucleon: helicity, High Energy Physics::Experiment, spin: asymmetry, Particle Physics - Experiment, omega(783): transverse momentum, experimental results
Abstract: Exclusive production of $\omega$ mesons was studied at the COMPASS experiment by scattering $160~\mathrm{GeV}/\mathit{c}$ muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured in the range of photon virtuality $1~(\mathrm{GeV}/\mathit{c})^2 < Q^2 < 10~(\mathrm{GeV}/\mathit{c})^2$, Bjorken scaling variable $0.003 < x_{\mathit{Bj}} < 0.3$ and transverse momentum squared of the $\omega$ meson $0.05~(\mathrm{GeV}/\mathit{c})^2 < p_{T}^{2} < 0.5~(\mathrm{GeV}/\mathit{c})^2$. The measured asymmetries are sensitive to the nucleon helicity-flip Generalised Parton Distributions (GPD) $E$ that are related to the orbital angular momentum of quarks, the chiral-odd GPDs $H_{T}$ that are related to the transversity Parton Distribution Functions, and the sign of the $\pi\omega$ transition form factor. The results are compared to recent calculations of a GPD-based model., Comment: 23 pages, 9 figures
Published: 2017

17. Observation of a new narrow axial-vector meson $a_1(1420)$

Author: Adolph, C., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, Antonio, Andrieux, V., Anosov, V., Austregesilo, A., Azevedo, C., Badełek, B., Balestra, Ferruccio, Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E. R., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, A., Büchele, M., Burtin, E., Chang, W. C., Chiosso, Michela, Choi, I., Chung, S. U., Cicuttin, A., Crespo, M. L., Curiel, Q., Dalla Torre, S., Dasgupta, S. S., Dasgupta, S., Denisov, O. Y. u., Dhara, L., Donskov, S. V., Doshita, N., Dünnweber, W., Duic, V., Dziewiecki, M., Efremov, A., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., Du Fresne Von Hohenesche, N., Friedrich, J. M., Frolov, Vladimir, Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Gnesi, Ivan, Gorzellik, M., Grabmüller, S., Grasso, Antonino, Grosse Perdekamp, M., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., Von Harrach, D., Hashimoto, R., Heinsius, F. H., Herrmann, F., Hinterberger, F., Horikawa, N., D'Hose, N., Hsieh, C. Y. u., Huber, S., Ishimoto, S., Ivanov, Artem, Ivanshin, Y. u., Iwata, T., Jahn, R., Jary, V., Jörg, P., Joosten, R., Kabuß, E., Ketzer, B., Khaustov, G. V., Khokhlov, Y. u. A., Kisselev, Y. u., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, Aram, Kouznetsov, O., Krämer, M., Kremser, P., Krinner, F., Kroumchtein, Z. V., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, S., Lichtenstadt, J., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Marchand, C., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Y. u. V., Miyachi, Y., Nagaytsev, A., Nagel, T., Nerling, F., Neyret, D., Nikolaenko, V. I., Novy, J., Nowak, W. D., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panzieri, D., Parsamyan, Bakur, Paul, S., Peng, J. C., Pereira, F., Pešek, Michael, Peshekhonov, D. V., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Riedl, C., Rocco, E., Rossiyskaya, N. S., Ryabchikov, D. I., Rychter, A., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, P., Schmeing, S., Schmidt, K., Schmieden, H., Schönning, K., Schopferer, S., Schlüter, T., Selyunin, A., Shevchenko, O. Y. u., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sozzi, F., Srnka, A., Stolarski, M., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, S., Ter Wolbeek, J., Tessaro, S., Tessarotto, F., Thibaud, F., Tskhay, V., Uhl, S., Veloso, J., Virius, M., Wallner, S., Weisrock, T., Wilfert, M., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., Zink, A., Adolph, C., Akhunzyanov, R., Alexeev, M. . g., Alexeev, G. . d., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Azevedo, C., Badełek, B., Balestra, F., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E. . r., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, Franco, Braun, C., Bressan, Andrea, Büchele, M., Burtin, E., Chang, W. C., Chiosso, M., Choi, I., Chung, S. . u., Cicuttin, A., Crespo, M. . l., Curiel, Q., DALLA TORRE, Silvia, Dasgupta, SHUDDHA SHANKAR, Dasgupta, S., Denisov, O. . y. u., Dhara, L., Donskov, S. . v., Doshita, N., Dünnweber, W., Duic, Venicio, Dziewiecki, M., Efremov, A., Eversheim, P. . d., Eyrich, W., 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., Gnesi, I., Gorzellik, M., Grabmüller, S., Grasso, A., Grosse Perdekamp, M., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., von Harrach, D., Hashimoto, R., Heinsius, F. . h., Herrmann, F., Hinterberger, F., Horikawa, N., D’Hose, N., Hsieh, C. Yu, Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y. u., Iwata, T., Jahn, R., Jary, V., Jörg, P., Joosten, R., Kabuß, E., Ketzer, B., Khaustov, G. . v., Khokhlov, Y. u. . a., Kisselev, Y. u., Klein, F., Klimaszewski, K., Koivuniemi, J. . h., Kolosov, V. . n., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V. . f., Kotzinian, A. . m., Kouznetsov, O., Krämer, M., Kremser, P., Krinner, F., Kroumchtein, Z. . v., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R. . p., Lednev, A. . a., Lehmann, A., Levillain, M., Levorato, Stefano, Lichtenstadt, J., Maggiora, A., Magnon, A., Makins, N., Makke, Nour, Mallot, G. . k., Marchand, C., Martin, Anna, Marzec, J., Matousek, Jan, Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Y. u. . v., Miyachi, Y., Nagaytsev, A., Nagel, T., Nerling, F., Neyret, D., Nikolaenko, V. . i., Novy, J., Nowak, W. D., Nunes, A. . s., Olshevsky, A. . g., Orlov, I., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J. C., Pereira, F., Pesek, M., Peshekhonov, D. . v., Platchkov, S., Pochodzalla, J., Polyakov, V. . a., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Riedl, C., Rocco, E., Rossiyskaya, N. . s., Ryabchikov, D. . i., Rychter, A., Samoylenko, V. . d., Sandacz, A., Santos, C., Sarkar, S., Savin, I. . a., Sbrizzai, Giulio, Schiavon, P., Schmeing, S., Schmidt, K., Schmieden, H., Schönning, K., Schopferer, S., Schlüter, T., Selyunin, A., Shevchenko, O. . y. u., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sozzi, Federica, Srnka, A., Stolarski, M., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, Stefano, ter Wolbeek, J., Tessaro, S., Tessarotto, F., Thibaud, F., Tskhay, V., Uhl, S., Veloso, J., Virius, M., Wallner, S., Weisrock, T., Wilfert, M., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., and Zink, A.
Subjects: ComputerSystemsOrganization_COMPUTERSYSTEMIMPLEMENTATION, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, FOS: Physical sciences, ComputerApplications_COMPUTERSINOTHERSYSTEMS, QCD, axial vector meson, GeneralLiterature_MISCELLANEOUS, High Energy Physics - Experiment, Physics and Astronomy (all), High Energy Physics - Experiment (hep-ex), ComputingMethodologies_PATTERNRECOGNITION, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract: The COMPASS collaboration at CERN has measured diffractive dissociation of 190 GeV/$c$ pions into the $\pi^-\pi^-\pi^+$ final state using a stationary hydrogen target. A partial-wave analysis (PWA) was performed in bins of $3\pi$ mass and four-momentum transfer using the isobar model and the so far largest PWA model consisting of 88 waves. A narrow $J^{PC} = 1^{++}$ signal is observed in the $f_0(980)\,\pi$ channel. We present a resonance-model study of a subset of the spin-density matrix selecting $3\pi$ states with $J^{PC} = 2^{++}$ and $4^{++}$ decaying into $\rho(770)\,\pi$ and with $J^{PC} = 1^{++}$ decaying into $f_0(980)\,\pi$. We identify a new $a_1$ meson with mass $(1414^{+15}_{-13})$ MeV/$c^2$ and width $(153^{+8}_{-23})$ MeV/$c^2$. Within the final states investigated in our analysis, we observe the new $a_1(1420)$ decaying only into $f_0(980)\,\pi$, suggesting its exotic nature., Comment: 8 pages, 1 figure
Published: 2015
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18. Measurement of the Charged-Pion Polarizability

Author: Adolph, C., Akhunzyanov, R., Alexeev, M. C., Alexeev, C. D., Amoroso, A., Andrieux, V. V., Anosov, V., Austregesilo, A., Badelek, B., Balestra, F., Barth, J., Baum, G., Beck, R., Bedfer, Y., Berlin, A., Bernhard, J., Bicker, K., Bieling, J., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, A., Buechele, M., Burtin, E., Capozza, L., Chiosso, M., Chung, S. U., Cicuttin, A., Colantoni, M., Crespo, M. L., Curie, Q., Dalla Torre, S., Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu, Dinkelbach, A. M., Donskov, S. V., Doshita, N., Duic, V., Duennweber, W., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Filin, A., Finger, M., Fischer, H., Franco, C., Hohenesche, N. Du Fresne, Friedrich, J. M., Frolov, V., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Geyer, R., Gnesi, I., Gobbo, B., Goertz, S., Gorzellik, M., Grahmueller, S., Grasso, A., Grube, B., Grussenmeyer, T., Guskov, A., Guthoerl, T., Haas, F., Harrach, D., Hahne, D., Hashimoto, R., Heinsius, F. H., Herrmann, F., Hinterberger, F., Hoeppner, Ch, Horikawa, N., D Hose, N., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu, Iwata, T., Jahn, R., Jary, V., Jasinski, P., Joerg, P., Joosten, R., Kabuss, E., Ketzer, B., Khaustov, G. V., Khokhlov, Yu A., Kisselev, Yu, Klein, F., Klimasewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O., Kraemer, M., Kroumchtein, Z. V., Kuchinski, N., Kuhn, R., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, S., Lichtenstadt, J., Maggiora, A., Magnon, A., Makke, N., Mallot, G. K., Marchand, C., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meschcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Yu V., Miyachi, Y., Moinester, M. A., Nagaytsev, A., Nagel, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Novy, J., Nowak, W. -D, Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Peshekhonov, D., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, C., Rocco, E., Rossiyskaya, N. S., Ryabchikov, D. I., Rychter, A., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Shrizzai, G., Schiavon, P., Schill, C., Schlueter, T., Schmidt, K., Schmieden, H., Schoenning, K., Schopferer, S., Schott, M., Shevchenko, O. Yu, Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sosio, S., Sozzi, F., Aleš Srnka, Steiger, L., Stolarski, M., Sulc, M., Sulej, R., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, S., Ter Wolbeek, J., Tessaro, S., Tessarotto, F., Thihaud, F., Uhl, S., Uman, I., Virius, M., Wang, L., Weisrock, T., Wilfert, M., Windmolders, R., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., Zink, A., Compass, Collaboration, Adolph, C., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Badełek, B., Balestra, F., Barth, J., Baum, G., Beck, R., Bedfer, Y., Berlin, A., Bernhard, J., Bicker, K., Bieling, J., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, Franco, Braun, C., Bressan, Andrea, Büchele, M., Burtin, E., Capozza, L., Chiosso, M., Chung, S. U., Cicuttin, A., Colantoni, M., Crespo, M. L., Curiel, Q., DALLA TORRE, Silvia, Dasgupta, SHUDDHA SHANKAR, Dasgupta, S., Denisov, Y. u., Dinkelbach, A. M., Donskov, S. V., Doshita, N., Duic, V., Dünnweber, W., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Filin, A., Finger, M., Fischer, H., Franco, C., Du Fresne Von Hohenesche, N., Friedrich, J. M., Frolov, V., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Geyer, R., Gnesi, I., Gobbo, B., Goertz, S., Gorzellik, M., Grabmüller, S., Grasso, A., Grube, B., Grussenmeyer, T., Guskov, A., Guthörl, T., Haas, F., Von Harrach, D., Hahne, D., Hashimoto, R., Heinsius, F. H., Herrmann, F., Hinterberger, F., Höppner, C. H., Horikawa, N., D'Hose, N., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Y. u., Iwata, T., Jahn, R., Jary, V., Jasinski, P., Jörg, P., Joosten, R., Kabuß, E., Ketzer, B., Khaustov, G. V., Khokhlov, Y. u. A., Kisselev, Y. u., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O., Krämer, M., Kroumchtein, Z. V., Kuchinski, N., Kuhn, R., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, Stefano, Lichtenstadt, J., Maggiora, A., Magnon, A., Makke, Nour, Mallot, G. K., Marchand, C., Martin, Anna, Marzec, J., Matousek, Jan, Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Y. u. V., Miyachi, Y., Moinester, M. A., Nagaytsev, A., Nagel, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Novy, J., Nowak, W. D., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Peshekhonov, D., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Rocco, E., Rossiyskaya, N. S., Ryabchikov, D. I., Rychter, A., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sbrizzai, Giulio, Schiavon, Paolo, Schill, C., Schlüter, T., Schmidt, K., Schmieden, H., Schönning, K., Schopferer, S., Schott, M., Shevchenko, O. Y. u., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sosio, S., Sozzi, Federica, Srnka, A., Steiger, L., Stolarski, M., Sulc, M., Sulej, R., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, Stefano, Ter Wolbeek, J., Tessaro, S., Tessarotto, F., Thibaud, F., Uhl, S., Uman, I., Virius, M., Wang, L., Weisrock, T., Wilfert, M., Windmolders, R., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., and Zink, A.
Subjects: Particle physics, Chiral perturbation theory, Photon, ComputerSystemsOrganization_COMPUTERSYSTEMIMPLEMENTATION, Strong interaction, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, General Physics and Astronomy, FOS: Physical sciences, ComputerApplications_COMPUTERSINOTHERSYSTEMS, GeneralLiterature_MISCELLANEOUS, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pion, Polarizability, Nuclear Experiment (nucl-ex), Nuclear Experiment, Physics, ChPT, Muon, Compton scattering, polarisability, ComputingMethodologies_PATTERNRECOGNITION, High Energy Physics::Experiment, Magnetic dipole, Particle Physics - Experiment
Abstract: The COMPASS collaboration at CERN has investigated pion Compton scattering, $\pi^-\gamma\rightarrow \pi^-\gamma$, at centre-of-mass energy below 3.5 pion masses. The process is embedded in the reaction $\pi^-\mathrm{Ni}\rightarrow\pi^-\gamma\;\mathrm{Ni}$, which is initiated by 190\,GeV pions impinging on a nickel target. The exchange of quasi-real photons is selected by isolating the sharp Coulomb peak observed at smallest momentum transfers, $Q^2, Comment: Published version: 9 pages, 3 figures, 1 table
Published: 2014

19. Final COMPASS results on the deuteron spin-dependent structure function $g_1^{\rm d}$ and the Bjorken sum rule

Author: Adolph, C., Aghasyan, M., Akhunzyanov, R., Alexeev, M.G., Alexeev, G.D., Amoroso, A., Andrieux, V., Anfimov, N.V., Anosov, V., 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., Braun, C., Bressan, A., Büchele, M., Chang, W.-C., Chatterjee, C., Chiosso, M., Choi, I., 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., Duic, V., Dünnweber, W., Dziewiecki, M., Efremov, A., Eversheim, P.D., Eyrich, W., Faessler, M., Ferrero, A., Finger, M., Finger Jr., 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., Giordano, F., Gnesi, I., Gorzellik, M., Grabmüller, S., Grasso, A., Grosse Perdekamp, M., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., Hamar, G., von Harrach, D., Heinsius, F.H., Heitz, R., Herrmann, F., Horikawa, N., d'Hose, N., Hsieh, C.-Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu., Iwata, T., Jary, V., Joosten, R., Jörg, P., Kabuß, E., Kerbizi, A., Ketzer, B., Khaustov, G.V., Khokhlov, Yu.A., Kisselev, Yu., Klein, F., Klimaszewski, K., Koivuniemi, J.H., Kolosov, V.N., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V.F., Kotzinian, A.M., Kouznetsov, O.M., Krämer, M., Kremser, P., Krinner, F., Kroumchtein, Z.V., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R.P., Lednev, A.A., Lehmann, A., Levillain, M., Levorato, S., Lian, Y.-S., Lichtenstadt, J., Longo, R., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G.K., 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., 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., Pešek, 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., Roskot, M., Rossiyskaya, N.S., Ryabchikov, D.I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V.D., Sandacz, A., Santos, C., Sarkar, S., Savin, I.A., Sawada, T., Sbrizzai, G., Schiavon, P., Schmidt, K., Schmieden, H., Schönning, K., Seder, E., Selyunin, A., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Smolik, J., Srnka, A., Steffen, D., Stolarski, M., Subrt, O., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, S., Tasevsky, M., Tessaro, S., Tessarotto, F., Thibaud, F., Thiel, A., Tosello, F., Tskhay, V., Uhl, S., Vauth, A., Veloso, J., Virius, M., Vondra, J., Wallner, S., Weisrock, T., Wilfert, M., Windmolders, R., Wolbeek, J. ter, Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Zhuravlev, N., Ziembicki, M., Zink, A., 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 ), and Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay
Subjects: cross section: ratio, sum rule: Bjorken, polarized target, FOS: Physical sciences, muon deuteron: deep inelastic scattering, structure function: spin, momentum transfer dependence, COMPASS, beam: energy, High Energy Physics - Experiment, x-dependence, renormalization, scaling: Bjorken, p: spin, High Energy Physics - Experiment (hep-ex), polarization: asymmetry, Spin, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], strong coupling, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], quark: helicity, quantum chromodynamics: perturbation theory, Nuclear Experiment, charge: axial, Parton helicity distributions, hep-ex, High Energy Physics::Phenomenology, coupling constant, deuteron: structure function, CERN SPS, Structure function, kinematics, final state: hadronic, nucleon: spin, High Energy Physics::Experiment, muon: polarized beam, statistical, Particle Physics - Experiment, Deep inelastic scattering, experimental results
Abstract: Final results are presented from the inclusive measurement of deep-inelastic polarised-muon scattering on longitudinally polarised deuterons using a $^6$LiD target. The data were taken at $160~{\rm GeV}$ beam energy and the results are shown for the kinematic range $1~({\rm GeV}/c)^2 < Q^2 < 100~({\rm GeV}/c)^2$ in photon virtuality, $0.004 4~{\rm GeV}/c^2$ in the mass of the hadronic final state. The deuteron double-spin asymmetry $A_1^{\rm d}$ and the deuteron longitudinal-spin structure function $g_1^{\rm d}$ are presented in bins of $x$ and $Q^2$. Towards lowest accessible values of $x$, $g_1^{\rm d}$ decreases and becomes consistent with zero within uncertainties. The presented final $g_1^{\rm d}$ values together with the recently published final $g_1^{\rm p}$ values of COMPASS are used to again evaluate the Bjorken sum rule and perform the QCD fit to the $g_1$ 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 $a_0$, {which is identified in the $\overline{\rm MS}$ renormalisation scheme with the total contribution of quark helicities to the nucleon spin}, is extracted from only the COMPASS deuteron data with negligible extrapolation uncertainty: $a_0 (Q^2 = 3~({\rm GeV}/c)^2) = 0.32 \pm 0.02_{\rm stat} \pm0.04_{\rm syst} \pm 0.05_{\rm evol}$. Together with the recent results on the proton spin structure function $g_1^{\rm p}$, the results on $g_1^{\rm d}$ constitute the COMPASS legacy on the measurements of $g_1$ through inclusive spin-dependent deep inelastic scattering., Comment: 16 pages, 6 figures
Published: 2016
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20. The spin structure function g1p of the proton and a test of the Bjorken sum rule

Author: Adolph, C., Akhunzyanov, R., Alexeev, M., Alexeev, G., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Azevedo, C., Badełek, B., Balestra, F., Barth, J., Baum, G., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, A., Büchele, M., Burtin, E., Capozza, L., Chang, C., Chiosso, M., Choi, I., Chung, S., Cicuttin, A., Crespo, M., Curiel, Q., Dalla Torre, S., Dasgupta, S., Denisov, O.Yu., Dhara, L., Donskov, S., Doshita, N., Duic, V., Dziewiecki, M., Efremov, A., Eversheim, P., Eyrich, W., Ferrero, A., Finger, M., Fischer, H., Franco, C., Du Fresne von Hohenesche, N., Friedrich, M., Frolov, V., Fuchey, E., Gautheron, F., Gavrichtchouk, P., Gerassimov, S., Giordano, F., Gnesi, I., Gorzellik, M., Grabmüller, S., Grasso, A., Grosse-Perdekamp, M., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., von Harrach, D., Hashimoto, R., Heinsius, F., Herrmann, F., Hinterberger, F., Horikawa, N., d'Hose, N., Yu Hsieh, C., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu., Iwata, T., Jahn, R., Jary, V., Jörg, P., Joosten, R., Kabuss, E., Ketzer, B., Khaustov, V., Khokhlov, A., Kisselev, Yu., Klein, F., Klimaszewski, K., Koivuniemi, J., Kolosov, V., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V., Kotzinian, A., Kouznetsov, O., Krämer, M., Kremser, P., Krinner, F., Kroumchtein, V., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R., Lednev, A., Lehmann, A., Levillain, M., Levorato, S., Lichtenstadt, J., Longo, R., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, K., Marchand, C., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, V., Miyachi, Y., Nagaytsev, A., Nagel, T., Nerling, F., Neyret, D., Nikolaenko, V., Novy, J., Nowak, D., Nunes, A., Olshevsky, A., Orlov, I., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J., Pereira, F., Pesek, M., Peshekhonov, V., Platchkov, S., Pochodzalla, J., Polyakov, A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Riedl, C., Rocco, E., Rossiyskaya, S., Ryabchikov, D.I., Rychter, A., Samoylenko, V., Sandacz, A., Santos, C., Sarkar, S., Savin, A., Sbrizzai, G., Schiavon, P., Schmidt, K., Schmieden, H., Schönning, K., Schopferer, S., Selyunin, A., Shevchenko, O.Yu., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sozzi, F., Srnka, A., Stolarski, M., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, S., ter Wolbeek, J., Tessaro, S., Tessarotto, F., Thibaud, F., Tosello, F., Tskhay, V., Uhl, S., Veloso, J., Virius, M., Weisrock, T., Wilfert, M., Windmolders, R., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., Zink, A., Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
Subjects: High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract: International audience; New results for the double spin asymmetry A(1)(p) and the proton longitudinal spin structure function g(1)(p) 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 g(1)(p)(x) by about a factor of two in the region x less than or similar to 0.02. A next-to-leading order QCD fit to the g(1) world data is performed. It leads to a new determination of the quark spin contribution to the nucleon spin, Delta Sigma, ranging from 0.26 to 0.36, and to a re-evaluation of the first moment of g(1)(p). The uncertainty of Delta Sigma 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 g(1)(NS) (x, Q(2)) yields as ratio of the axial and vector coupling constants vertical bar gA/gV vertical bar = 1.22 +/- 0.05 (stat.) +/- 0.10 (syst.), which validates the sum rule to an accuracy of about 9%.
Published: 2016

21. Exclusive $��$ meson muoproduction on transversely polarised protons

Author: Adolph, C., Agarwala, J., Aghasyan, M., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Augustyniak, W., Austregesilo, A., Azevedo, C. D. R., Badelek, B., Balestra, F., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E. R., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, A., Buechele, M., Chang, W. -C., Chatterjee, C., Chiosso, M., Choi, I., Chung, S. -U., Cicuttin, A., Crespo, M. L., Curiel, Q., Torre, S. Dalla, Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Dhara, L., Donskov, S. V., Doshita, N., Duic, V., Duennweber, W., Dziewiecki, M., Efremov, A., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., von Hohenesche, N. du Fresne, Friedrich, J. M., Frolov, V., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giordano, F., Gnesi, I., Gorzellik, M., Grabmueller, S., Grasso, A., Perdekamp, M. Grosse, Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., von Harrach, D., Hashimoto, R., Heinsius, F. H., Heitz, R., Herrmann, F., Hinterberger, F., Horikawa, N., dHose, N., Hsieh, C. -Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu., Iwata, T., Jahn, R., Jary, V., Joosten, R., Joerg, P., Kabuss, E., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Kraemer, M., Kremser, P., Krinner, F., Kroumchtein, Z. V., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, S., Lian, Y. -S., Lichtenstadt, J., Longo, R., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Marchand, C., Marianski, B., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G. V., Meyer, M., Meyer, W., Michigami, T., Mikhailov, Yu. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Montuenga, P., Nagaytsev, A., Nerling, F., Neyret, D., Nikolaenko, V. I., Novy, 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., Pesek, 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., Roskot, M., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, G., Schiavon, P., Schmidt, K., Schmieden, H., Schoenning, K., Schopferer, S., Seder, E., Selyunin, A., Shevchenko, O. Yu., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Smolik, J., Sozzi, F., Srnka, A., Steffen, D., Stolarski, M., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, S., Tasevsky, M., Tessaro, S., Tessarotto, F., Thibaud, F., Tosello, F., Tskhay, V., Uhl, S., Veloso, J., Virius, M., Vondra, J., Wallner, S., Weisrock, T., Wilfert, M., ter Wolbeek, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., and Zink, A.
Subjects: Statistics::Theory, High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract: Exclusive production of $��$ mesons was studied at the COMPASS experiment by scattering $160~\mathrm{GeV}/\mathit{c}$ muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured in the range of photon virtuality $1~(\mathrm{GeV}/\mathit{c})^2 < Q^2 < 10~(\mathrm{GeV}/\mathit{c})^2$, Bjorken scaling variable $0.003 < x_{\mathit{Bj}} < 0.3$ and transverse momentum squared of the $��$ meson $0.05~(\mathrm{GeV}/\mathit{c})^2 < p_{T}^{2} < 0.5~(\mathrm{GeV}/\mathit{c})^2$. The measured asymmetries are sensitive to the nucleon helicity-flip Generalised Parton Distributions (GPD) $E$ that are related to the orbital angular momentum of quarks, the chiral-odd GPDs $H_{T}$ that are related to the transversity Parton Distribution Functions, and the sign of the $��$ transition form factor. The results are compared to recent calculations of a GPD-based model., 23 pages, 9 figures
Published: 2016
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22. Multiplicities of charged pions and unidentified charged hadrons from deep-inelastic scattering of muons off an isoscalar target

Author: Adolph, C., Agarwala, J., Aghasyan, M., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anfimov, N. V., Anosov, V., Augustyniak, W., Austregesilo, A., Azevedo, C. D. R., Badelek, B., Balestra, F., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E. R., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, A., Buechele, M., Capozza, L., Chang, W. -C., Chatterjee, C., Chiosso, M., Choi, I., Chung, S. -U., Cicuttin, A., Crespo, M. L., Curiel, Q., Torre, S. Dalla, Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Dhara, L., Donskov, S. V., Doshita, N., Duic, V., Duennweber, W., Dziewiecki, M., Efremov, A., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Finger, M., Finger jr., M., Fischer, H., Franco, C., von Hohenesche, N. du Fresne, Friedrich, J. M., Frolov, V., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giordano, F., Gnesi, I., Gorzellik, M., Grabmueller, S., Grasso, A., Perdekamp, M. Grosse, Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., von Harrach, D., Hashimoto, R., Heinsius, F. H., Heitz, R., Herrmann, F., Hinterberger, F., Horikawa, N., dHose, N., Hsieh, C. -Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu., Iwata, T., Jahn, R., Jary, V., Joosten, R., Joerg, P., Kabuss, E., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O. M., Kuhn, R., Kraemer, M., Kremser, P., Krinner, F., Kroumchtein, Z. V., Kulinich, Y., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, S., Lichtenstadt, J., Longo, R., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Marchand, C., Marianski, B., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G. V., Meyer, W., Michigami, T., Mikhailov, Yu. V., Mikhasenko, M., Mitrofanov, E., Mitrofanov, N., Miyachi, Y., Montuenga, P., Nagaytsev, A., Nerling, F., Neyret, D., Nikolaenko, V. I., Novy, 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., Pesek, M., Peshekhonov, D. V., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Riedl, C., Roskot, M., Ryabchikov, D. I., Rybnikov, A., Rychter, A., Salac, R., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sawada, T., Sbrizzai, G., Schiavon, P., Schmidt, K., Schmieden, H., Schoenning, K., Schopferer, S., Seder, E., Selyunin, A., Shevchenko, O. Yu., Steffen, D., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Smolik, J., Sozzi, F., Srnka, A., Stolarski, M., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, S., Tasevsky, M., Tessaro, S., Tessarotto, F., Thibaud, F., Tosello, F., Tskhay, V., Uhl, S., Veloso, J., Virius, M., Vondra, J., Weisrock, T., Wilfert, M., Windmolders, R., ter Wolbeek, J., Zaremba, K., Zavada, P., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., and Zink, A.
Subjects: High Energy Physics - Experiment (hep-ex), Nuclear Theory, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, High Energy Physics - Experiment
Abstract: Multiplicities of charged pions and unidentified hadrons produced in deep-inelastic scattering were measured in 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 160 GeV muon beam and an isoscalar target ($^6$LiD). They cover the kinematic domain in the photon virtuality $Q^2$ > 1(GeV/c$)^2$, $0.004 < x < 0.4$, $0.2 < z < 0.85$ and $0.1 < y < 0.7$. In addition, a leading-order pQCD analysis was performed using the pion multiplicity results to extract quark fragmentation functions.
Published: 2016
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23. Search for exclusive photoproduction of Z(c)(+/-) (3900) at COMPASS

Author: Adolph, C., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Badelek, B., Balestra, F., Barth, J., Baum, G., Beck, R., Bedfer, Y., Berlin, A., Bernhard, J., Bicker, K., Bielert, E. R., Bieling, J., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, A., Buechele, M., Burtin, E., Capozza, L., Chiosso, M., Chung, S. U., Cicuttin, A., Crespo, M. L., Curiel, Q., Dalla Torre, S., Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu, Donskov, S. V., Doshita, N., Duic, V., Duennweber, W., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Filin, A., Finger, M., Fischer, H., Franco, C., Hohenesche, N. Du Fresne, Friedrich, J. M., Frolov, V., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Geyer, R., Gnesi, I., Gobbo, B., Goertz, S., Gorzellik, M., Grabmueller, S., Grasso, A., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Harrach, D., Hahne, D., Hashimoto, R., Heinsius, F. H., Herrmann, F., Hinterberger, F., Hoeppner, Ch, Horikawa, N., D Hose, N., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu, Iwata, T., Jahn, R., Jary, V., Jasinski, P., Joerg, P., Joosten, R., Kabuss, E., Ketzer, B., Khaustov, G. V., Khokhlov, Yu A., Kisselev, Yu, Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O., Kraemer, M., Kroumchtein, Z. V., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, S., Lichtenstadt, J., Maggiora, A., Magnon, A., Makke, N., Mallot, G. K., Marchand, C., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Yu V., Miyachi, Y., Nagaytsev, A., Nagel, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Novy, J., Nowak, W. -D, Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Peshekhonov, D. V., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Rocco, E., Rossiyskaya, N. S., Ryabchikov, D. I., Rychter, A., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, P., Schill, C., Schlueter, T., Schmidt, K., Schmieden, H., Schoenning, K., Schopferer, S., Schott, M., Shevchenko, O. Yu, Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sosio, S., Sozzi, F., Aleš Srnka, Steiger, L., Stolarski, M., Sulc, M., Sulej, R., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, S., Ter Wolbeek, J., Tessaro, S., Tessarotto, F., Thibaud, F., Uhl, S., Uman, I., Virius, M., Wang, L., Weisrock, T., Wilfert, M., Windmolders, R., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., Zink, A., Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and COMPASS
Subjects: Nuclear and High Energy Physics, Zc(3900), Physics, QC1-999, Z(c)(3900), High Energy Physics::Phenomenology, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], COMPASS, High Energy Physics - Experiment, ddc, Physik, High Energy Physics - Experiment (hep-ex), Photoproduction, Tetraquark, High Energy Physics::Experiment, ddc:530, Z c ( 3900 ), Particle Physics - Experiment
Abstract: A search for the exclusive production of the $Z_c^{\pm}(3900)$ hadron by virtual photons has been performed in the channel $Z_c^{\pm}(3900)\rightarrow J/\psi \pi^{\pm}$. The data cover the range from 7 GeV to 19 GeV in the centre-of-mass energy of the photon-nucleon system. The full set of the COMPASS data set collected with a muon beam between 2002 and 2011 has been used. An upper limit for the ratio $BR(Z_c^{\pm}(3900)\rightarrow J/\psi \pi^{\pm} )\times \sigma_{ \gamma~N \rightarrow Z_c^{\pm}(3900)~ N} /\sigma_{\gamma~N \rightarrow J/\psi~ N}$ of $3.7\times10^{-3}$ has been established at the confidence level of 90%., Comment: 8 pages, 3 figures, 1 table
Published: 2015

24. Measurement of the Charged-Pion Polarizability

Author: Adolph, C., Andrieux, V., Bedfer, Y., Boer, M, Burtin, E., Capozza, L., Curiel, Q, Ferrero, A., D'Hose, N., Kunne, F, Levillain, M., Magnon, A., Marchand, C., Neyret, D., Platchkov, S., Thibaud, F., Wollny, H., COMPASS, Collaboration, Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and COMPASS
Subjects: [PHYS]Physics [physics], High Energy Physics::Experiment
Abstract: International audience; The COMPASS collaboration at CERN has investigated pion Compton scattering, π−γ → π−γ, at centerof-mass energy below 3.5 pion masses. The process is embedded in the reaction π−Ni → π−γNi, which isinitiated by 190 GeV pions impinging on a nickel target. The exchange of quasireal photons is selected byisolating the sharp Coulomb peak observed at smallest momentum transfers, Q2 < 0.0015 ðGeV=cÞ2.From a sample of 63 000 events, the pion electric polarizability is determined to be απ ¼ ð2.0 0.6stat 0.7systÞ × 10−4 fm3 under the assumption απ ¼ −βπ, which relates the electric and magnetic dipolepolarizabilities. It is the most precise measurement of this fundamental low-energy parameter of stronginteraction that has been addressed since long by various methods with conflicting outcomes. While thisresult is in tension with previous dedicated measurements, it is found in agreement with the expectationfrom chiral perturbation theory. An additional measurement replacing pions by muons, for which the crosssectionbehavior is unambiguously known, was performed for an independent estimate of the systematicuncertainty.
Published: 2015

25. The Spin Structure Function $g_1^{\rm p}$ of the Proton and a Test of the Bjorken Sum Rule

Author: Adolph, C., Akhunzyanov, R., Alexeev, M.G., Alexeev, G.D., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Azevedo, C., Badelek, B., Balestra, F., Barth, J., Baum, G., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E.R., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, A., Buchele, M., Burtin, E., Capozza, L., Chang, W.C., Chiosso, M., Choi, I., 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., Duic, V., Dziewiecki, M., Efremov, A., Eversheim, P.D., Eyrich, W., Ferrero, A., Finger, M., Finger, M., Jr., Fischer, H., Franco, C., von Hohenesche, N. du Fresne, Friedrich, J.M., Frolov, V., Fuchey, E., Gautheron, F., Gavrichtchouk, O.P., Gerassimov, S., Giordano, F., Gnesi, I., Gorzellik, M., Grabmuller, S., Grasso, A., Grosse-Perdekamp, M., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., von Harrach, D., Hashimoto, R., Heinsius, F.H., Herrmann, F., Hinterberger, F., Horikawa, N., d'Hose, N., Hsieh, C.Yu, Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu., Iwata, T., Jahn, R., Jary, V., Jorg, P., Joosten, R., Kabuss, E., Ketzer, B., Khaustov, G.V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Klimaszewski, K., Koivuniemi, J.H., Kolosov, V.N., Kondo, K., Konigsmann, K., Konorov, I., Konstantinov, V.F., Kotzinian, A.M., Kouznetsov, O., Kramer, M., Kremser, P., Krinner, F., Kroumchtein, Z.V., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R.P., Lednev, A.A., Lehmann, A., Levillain, M., Levorato, S., Lichtenstadt, J., Longo, R., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G.K., Marchand, C., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Yu. V., Miyachi, Y., Nagaytsev, A., Nagel, T., Nerling, F., Neyret, D., Nikolaenko, V.I., Novy, J., Nowak, W.D., Nunes, A.S., Olshevsky, A.G., Orlov, I., Ostrick, M., Panzieri, D., Parsamyan, B., Paul, S., Peng, J.C., Pereira, F., Pesek, M., Peshekhonov, D.V., Platchkov, S., Pochodzalla, J., Polyakov, V.A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Riedl, C., Rocco, E., Rossiyskaya, N.S., Ryabchikov, D.I., Rychter, A., Samoylenko, V.D., Sandacz, A., Santos, C., Sarkar, S., Savin, I.A., Sbrizzai, G., Schiavon, P., Schmidt, K., Schmieden, H., Schonning, K., Schopferer, S., Selyunin, A., Shevchenko, O.Yu., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sozzi, F., Srnka, A., Stolarski, M., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, S., Wolbeek, J. ter, Tessaro, S., Tessarotto, F., Thibaud, F., Tosello, F., Tskhay, V., Uhl, S., Veloso, J., Virius, M., Weisrock, T., Wilfert, M., Windmolders, R., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., and Zink, A.
Subjects: High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), FOS: Physical sciences, High Energy Physics::Experiment, Particle Physics - Experiment, High Energy Physics - Experiment
Abstract: New results for the double spin asymmetry $A_1^{\rm p}$ and the proton longitudinal spin structure function $g_1^{\rm p}$ are presented. They were obtained by the COMPASS collaboration using polarised 200 GeV muons scattered off a longitudinally polarised NH$_3$ 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 $g_1^{\rm p}(x)$ by about a factor of two in the region $x\lesssim 0.02$. A next-to-leading order QCD fit to the $g_1$ world data is performed. It leads to a new determination of the quark spin contribution to the nucleon spin, $\Delta \Sigma$ ranging from 0.26 to 0.36, and to a re-evaluation of the first moment of $g_1^{\rm p}$. The uncertainty of $\Delta \Sigma$ 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 $g_1^{\rm NS}(x,Q^2)$ yields as ratio of the axial and vector coupling constants $|g_{\rm A}/g_{\rm V}| = 1.22 \pm 0.05~({\rm stat.}) \pm 0.10~({\rm syst.})$, which validates the sum rule to an accuracy of about 9\%., Comment: 19 pages, 8 figures and tables
Published: 2015
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26. Odd and even partial waves of $ηπ^−$ and $η′π^−$ in $π^−p → η^{(′)}π^−p$ at 191 GeV/c

Author: Adolph, C., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Badelek, B., Balestra, F., Barth, J., Baum, Günter, Beck, R., Bedfer, Y., Berlin, A., Bernhard, J., Bicker, K., Bielert, E. R., Bieling, J., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, A., Buechele, M., Burtin, E., Capozza, L., Chiosso, M., Chung, S. U., Cicuttin, A., Crespo, M. L., Curiel, Q., Dalla Torre, S., Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Donskov, S. V., Doshita, N., Duic, V., Duennweber, W., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Finger, M., Finger, M., Jr., Fischer, H., Franco, C., von Hohenesche, N. Du Fresne, Friedrich, J. M., Frolov, V., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Geyer, R., Gnesi, I., Gobbo, B., Goertz, S., Gorzellik, M., Grabmueller, S., Grasso, A., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., von Harrach, D., Hahne, D., Hashimoto, R., Heinsius, H., Herrmann, F., Hinterberger, F., Hoeppner, Ch., Horikawa, N., d'Hose, N., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu., Iwata, T., Jahn, R., Jary, V., Jasinski, P., Joerg, P., Joosten, R., Kabuss, E., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O., Kraemer, M., Kroumchtein, Z. V., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, S., Lichtenstadt, J., Maggiora, A., Magnon, A., Makke, N., Mallot, G. K., Marchand, C., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Yu. V., Miyachi, Y., Nagaytsev, A., Nagel, T., Nerling, F., Neubert, S., Neyret, D., Novy, J., Nowak, W. -D., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Peshekhonov, D. V., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Rocco, E., Rossiyskaya, N. S., Ryabchikov, D. I., Rychter, A., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, P., Schill, C., Schlueter, T., Schmidt, K., Schmieden, H., Schoenning, K., Schopferer, S., Schott, M., Shevchenko, O. Yu., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sosio, S., Sozzi, F., Srnka, A., Steiger, L., Stolarski, M., Sulc, M., Sulej, R., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, S., ter Wolbeek, J., Tessaro, S., Tessarotto, F., Thibaud, F., Uhl, S., Uman, I., Virius, M., Wang, L., Weisrock, T., Wilfert, M., Windmolders, R., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., and Zink, A.
Subjects: High Energy Physics::Experiment, Nuclear Experiment
Abstract: Exclusive production of $\eta\pi^-$ and $\eta'\pi^-$ has been studied with a $191\,\textrm{GeV}/c$ $\pi^-$ beam impinging on a hydrogen target at COMPASS (CERN). Partial-wave analyses reveal different odd/even angular momentum ($L$) characteristics in the inspected invariant mass range up to $3\,\textrm{GeV}/c^2$. A striking similarity between the two systems is observed for the $L=2,4,6$ intensities (scaled by kinematical factors) and the relative phases. The known resonances $a_2(1320)$ and $a_4(2040)$ are in line with this similarity. In contrast, a strong enhancement of $\eta'\pi^-$ over $\eta\pi^-$ is found for the $L=1,3,5$ waves, which carry non-$q\bar q$ quantum numbers. The $L=1$ intensity peaks at $1.7\,\textrm{GeV}/c^2$ in $\eta'\pi^-$ and at $1.4\,\textrm{GeV}/c^2$ in $\eta\pi^-$, the corresponding phase motions with respect to $L=2$ are different.
Published: 2015

27. Resonance Production and $��$ S-wave in $��^- + p \rightarrow ��^- ��^- ��^+ + p_{recoil}$ at 190 GeV/c

Author: Adolph, C., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Augustyniak, W., Austregesilo, A., Azevedo, C. D. R., Bade��ek, B., Balestra, F., Barth, J., Beck, R., Bedfer, Y., Bernhard, J., Bicker, K., Bielert, E. R., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, A., B��chele, M., Burtin, E., Chang, W. -C., Chiosso, M., Choi, I., Chung, S. U., Cicuttin, A., Crespo, M. L., Curiel, Q., Torre, S. Dalla, Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Dhara, L., Donskov, S. V., Doshita, N., Duic, V., D��nnweber, W., Dziewiecki, M., Efremov, A., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Finger, M., Fischer, H., Franco, C., von Hohenesche, N. du Fresne, Friedrich, J. M., Frolov, V., Fuchey, E., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Giordano, F., Gnesi, I., Gorzellik, M., Grabm��ller, S., Grasso, A., Perdekamp, M. Grosse, Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., Hahne, D., von Harrach, D., Hashimoto, R., Heinsius, F. H., Herrmann, F., Hinterberger, F., Horikawa, N., d'Hose, N., Hsieh, C. -Y., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu., Iwata, T., Jahn, R., Jary, V., Joosten, R., J��rg, P., Kabu��, E., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., K��nigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O., Kr��mer, M., Kremser, P., Krinner, F., Kroumchtein, Z. V., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, S., Lichtenstadt, J., Longo, R., Maggiora, A., Magnon, A., Makins, N., Makke, N., Mallot, G. K., Marchand, C., Marianski, B., Martin, A., Marzec, J., Matou��ek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Yu. V., Miyachi, Y., Montuenga, P., Nagaytsev, A., Nerling, F., Neyret, D., Nikolaenko, V. I., Nov��, 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., Pe��ek, M., Peshekhonov, D. V., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Riedl, C., Rossiyskaya, N. S., Ryabchikov, D. I., Rychter, A., Samoylenko, V. D., Sandacz, A., Santos, C., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, P., Schl��ter, T., Schmidt, K., Schmieden, H., Sch��nning, K., Schopferer, S., Selyunin, A., Shevchenko, O. Yu., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sozzi, F., Srnka, A., Stolarski, M., Sulc, M., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, S., Tessaro, S., Tessarotto, F., Thibaud, F., Tosello, F., Tskhay, V., Uhl, S., Veloso, J., Virius, M., Weisrock, T., Wilfert, M., ter Wolbeek, J., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., and Zink, A.
Subjects: High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), FOS: Physical sciences, High Energy Physics::Experiment
Abstract: The COMPASS collaboration has collected the currently largest data set on diffractively produced $��^-��^-��^+$ final states using a negative pion beam of 190 GeV/c momentum impinging on a stationary proton target. This data set allows for a systematic partial-wave analysis in 100 bins of three-pion mass, $0.5 < m_{3��} < 2.5$ GeV/c$^2$ , and in 11 bins of the reduced four-momentum transfer squared, $0.1 < t < 1.0$ (GeV/c)$^2$ . This two-dimensional analysis offers sensitivity to genuine one-step resonance production, i.e. the production of a state followed by its decay, as well as to more complex dynamical effects in nonresonant $3��$ production. In this paper, we present detailed studies on selected $3��$ partial waves with $J^{PC} = 0^{-+}$, $1^{++}$, $2^{-+}$, $2^{++}$, and $4^{++}$. In these waves, we observe the well-known ground-state mesons as well as a new narrow axial-vector meson $a_1(1420)$ decaying into $f_0(980) ��$. In addition, we present the results of a novel method to extract the amplitude of the $��^-��^+$ subsystem with $I^{G}J^{PC} = 0^+ 0^{++}$ in various partial waves from the $��^-��^-��^+$ data. Evidence is found for correlation of the $f_0(980)$ and $f_0(1500)$ appearing as intermediate $��^- ��^+$ isobars in the decay of the known $��(1800)$ and $��_2(1880)$., 96 pages
Published: 2015
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28. Search for the $\phi1860$ Pentaquark at COMPASS

Author: Ageev, E. S., Alexakhin, V. Y. U., Alexandrov, Y. U., Alexeev, G. D., Amoroso, A., Badelek, B., Balestra, F., Ball, J., Baum, G., Bedfer, Y., Berglund, P., Bernet, C., Bertini, R., Birsa, R., Bisplinghoff, J., Bordalo, P., Bradamante, Franco, Bressan, Andrea, Brona, G., Burtin, E., Bussa, M. P., Bytchkov, V. N., Cerini, L., Chapiro, A., Cicuttin, A., Colantoni, M., Colavita, A. A., Costa, S., Crespo, M. L., D'Hose, N., DALLA TORRE, S., Dasgupta, S. S., DE MASI, R., Dedek, N., Denisov, O. Y. U., Dhara, L., DIAZ KAVKA, V., Dinkelbach, A. M., Dolgopolov, A. V., Donskov, S. V., Dorofeev, V. A., Doshita, N., Duic, V., Dunnweber, W., Ehlers, J., Eversheim, P. D., Eyrich, W., Faessler, M., Falaleev, V., Fauland, P., Ferrero, A., Ferrero, L., Finger, M., Fischer, H., Franz, J., Friedrich, J. M., Frolov, V., Fuchs, U., Garfagnini, R., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Geyer, R., Giorgi, Marcello, Gobbo, B., Goertz, S., Gorin, A. M., Grajek, O. A., Grasso, A., Grube, B., Grunemaier, A., Hannappel, J., VON HARRACH, D., Hasegawa, T., Hedicke, S., Heinsius, F. H., Hermann, R., Hess, C., Hinterberger, F., VON HODENBERG, M., Horikawa, N., Horikawa, S., Ilgner, C., Ioukaev, A. I., Ishimoto, S., Ivanov, O., Iwata, T., Jahn, R., Janata, A., Joosten, R., Jouravlev, N. I., Kabuss, E., Kalinnikov, V., Kang, D., Karstens, F., Kastaun, W., Ketzer, B., Khaustov, G. V., Khokhlov, Y. U. A., Khomutov, N. V., Kisselev, Y. U., Klein, F., Koivuniemi, J. H., Kolosov, V. N., Komissarov, E. V., Kondo, K., Konigsmann, K., Konoplyannikov, A. K., Konorov, I., Konstantinov, V. F., Korentchenko, A. S., Korzenev, A., Kotzinian, A. M., Koutchinski, N. A., Kowalik, K., Kravchuk, N. P., Krivokhizhin, G. V., Kroumchtein, Z. V., Kuhn, R., Kunne, F., Kurek, K., Ladygin, M. E., Lamanna, M., LE GOFF, J. M., Leberig, M., Lichtenstadt, J., Liska, T., Ludwig, I., Maggiora, A., Maggiora, M., Magnon, A., Mallot, G. K., Manuilov, I. V., Marchand, C., Marroncle, J., Martin, Anna, Marzec, J., Matsuda, T., Maximov, A. N., Medved, K. S., Meyer, W., Mielech, A., Mikhailov, Y. U. V., Moinester, M. A., Nahle, O., Nassalski, J., Neliba, S., Neyret, D. P., Nikolaenko, V. I., Nozdrin, A. A., Obraztsov, V. F., Olshevsky, A. G., Ostrick, M., Padee, A., Pagano, P., Panebianco, S., Panzieri, D., Paul, S., Pereira, H. D., Peshekhonov, D. V., Peshekhonov, V. D., Piragino, G., Platchkov, S., Platzer, K., Pochodzalla, J., Polyakov, V. A., Popov, A. A., Pretz, J., Procureur, S., Quintans, C., Ramos, S., Rebourgeard, P. C., Reicherz, G., Reymann, J., Rozhdestvensky, A. M., Rondio, E., Sadovski, A. B., Saller, E., Samoylenko, V. D., Sandacz, A., Sapozhnikov, M. G., Savin, IGOR A., Schiavon, Paolo, Schill, C., Schmidt, T., Schmitt, H., Schmitt, L., Shevchenko, O. Y. U., Shishkin, A. A., Siebert, H. W., Sinha, L., Sissakian, A. N., Skachkova, A., Slunecka, M., Smirnov, G. I., Sozzi, F., Sugonyaev, V. P., Srnka, A., Stinzing, F., Stolarski, M., Sulc, M., Sulej, R., Takabayashi, N., Tchalishev, V. V., Tessarotto, F., Teufel, A., Tkatchev, L. G., Toeda, T., Tretyak, V. I., Trousov, S., Varanda, M., Virius, M., Vlassov, N. V., Wagner, M., Webb, R., Weise, E., Weitzel, Q., Wiesmann, M., Windmolders, R., Wirth, S., Wislicki, W., Zanetti, A. M., Zaremba, K., Zhao, J., Ziegler, R., Zvyagin, A., E. S., Ageev, Alexakhin, V. Y. U., Alexandrov, Y. U., G. D., Alexeev, A., Amoroso, B., Badelek, F., Balestra, J., Ball, G., Baum, Y., Bedfer, P., Berglund, C., Bernet, R., Bertini, R., Birsa, J., Bisplinghoff, P., Bordalo, Bradamante, Franco, Bressan, Andrea, G., Brona, E., Burtin, M. P., Bussa, V. N., Bytchkov, L., Cerini, A., Chapiro, A., Cicuttin, M., Colantoni, A. A., Colavita, S., Costa, M. L., Crespo, N., D'Hose, S., DALLA TORRE, S. S., Dasgupta, R., DE MASI, N., Dedek, Denisov, O. Y. U., L., Dhara, V., DIAZ KAVKA, A. M., Dinkelbach, A. V., Dolgopolov, S. V., Donskov, V. A., Dorofeev, N., Doshita, V., Duic, W., Dunnweber, J., Ehler, P. D., Eversheim, W., Eyrich, M., Faessler, V., Falaleev, P., Fauland, A., Ferrero, L., Ferrero, M., Finger, Jr, H., Fischer, J., Franz, J. M., Friedrich, V., Frolov, U., Fuch, R., Garfagnini, F., Gautheron, O. P., Gavrichtchouk, S., Gerassimov, R., Geyer, Giorgi, Marcello, B., Gobbo, S., Goertz, A. M., Gorin, O. A., Grajek, A., Grasso, B., Grube, A., Grunemaier, J., Hannappel, D., VON HARRACH, T., Hasegawa, S., Hedicke, F. H., Heinsiu, R., Hermann, C., He, F., Hinterberger, M., VON HODENBERG, N., Horikawa, S., Horikawa, C., Ilgner, A. I., Ioukaev, S., Ishimoto, O., Ivanov, T., Iwata, R., Jahn, A., Janata, R., Joosten, N. I., Jouravlev, E., Kabu, V., Kalinnikov, D., Kang, F., Karsten, W., Kastaun, B., Ketzer, G. V., Khaustov, Khokhlov, Y. U. A., N. V., Khomutov, Kisselev, Y. U., F., Klein, J. H., Koivuniemi, V. N., Kolosov, E. V., Komissarov, K., Kondo, K., Konigsmann, A. K., Konoplyannikov, I., Konorov, V. F., Konstantinov, A. S., Korentchenko, A., Korzenev, A. M., Kotzinian, N. A., Koutchinski, K., Kowalik, N. P., Kravchuk, G. V., Krivokhizhin, Z. V., Kroumchtein, R., Kuhn, F., Kunne, K., Kurek, M. E., Ladygin, M., Lamanna, J. M., LE GOFF, M., Leberig, J., Lichtenstadt, T., Liska, I., Ludwig, A., Maggiora, M., Maggiora, A., Magnon, G. K., Mallot, I. V., Manuilov, C., Marchand, J., Marroncle, Martin, Anna, J., Marzec, T., Matsuda, A. N., Maximov, K. S., Medved, W., Meyer, A., Mielech, Mikhailov, Y. U. V., M. A., Moinester, O., Nahle, J., Nassalski, S., Neliba, D. P., Neyret, V. I., Nikolaenko, A. A., Nozdrin, V. F., Obraztsov, A. G., Olshevsky, M., Ostrick, A., Padee, P., Pagano, S., Panebianco, D., Panzieri, S., Paul, H. D., Pereira, D. V., Peshekhonov, V. D., Peshekhonov, G., Piragino, S., Platchkov, K., Platzer, J., Pochodzalla, V. A., Polyakov, A. A., Popov, J., Pretz, S., Procureur, C., Quintan, S., Ramo, P. C., Rebourgeard, G., Reicherz, J., Reymann, A. M., Rozhdestvensky, E., Rondio, A. B., Sadovski, E., Saller, V. D., Samoylenko, A., Sandacz, M. G., Sapozhnikov, IGOR A., Savin, Schiavon, Paolo, C., Schill, T., Schmidt, H., Schmitt, L., Schmitt, Shevchenko, O. Y. U., A. A., Shishkin, H. W., Siebert, L., Sinha, A. N., Sissakian, A., Skachkova, M., Slunecka, G. I., Smirnov, F., Sozzi, V. P., Sugonyaev, A., Srnka, F., Stinzing, M., Stolarski, M., Sulc, R., Sulej, N., Takabayashi, V. V., Tchalishev, F., Tessarotto, A., Teufel, L. G., Tkatchev, T., Toeda, V. I., Tretyak, S., Trousov, M., Varanda, M., Viriu, N. V., Vlassov, M., Wagner, R., Webb, E., Weise, Q., Weitzel, M., Wiesmann, R., Windmolder, S., Wirth, W., Wislicki, A. M., Zanetti, K., Zaremba, J., Zhao, R., Ziegler, and A., Zvyagin
Subjects: Physics, Particle physics, Large Hadron Collider, Photon, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Nuclear Theory, High Energy Physics::Phenomenology, Hyperon, FOS: Physical sciences, 01 natural sciences, Pentaquark, High Energy Physics - Experiment, Baryon, High Energy Physics - Experiment (hep-ex), Exotic baryon, Compass, 0103 physical sciences, COMPASS experiment, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: Narrow Xi-pi+- and Xi-bar+pi+- resonances produced by quasi-real photons have been searched for by the COMPASS experiment at CERN. The study was stimulated by the recent observation of an exotic baryonic state decaying into Xi-pi-, at a mass of 1862 MeV, interpreted as a pentaquark. While the ordinary hyperon states Xi(1530)^0 and Xi-bar(1530)^0 are clearly seen, no exotic baryon is observed in the data taken in 2002 and 2003., Comment: 10 pages, 5 figures
Published: 2005

29. Azimuthal asymmetries of charged hadrons produced by high-energy muons scattered off longitudinally polarised deuterons

Author: Alekseev, M. G., Alexakhin, V. Y., Alexandrov, Y., Alexeev, G. D., Amoroso, Antonio, Austregesilo, A., Badeek, B., Balestra, Ferruccio, Barth, J., Baum, G., Bedfer, Y., Bernhard, J., Bertini, R., Bettinelli, M., Birsa, R., Bisplinghoff, J., Bordalo, P., Bradamante, F., Bravar, A., Bressan, A., Brona, G., Burtin, E., Bussa, Maria Pia, Chaberny, D., Chiosso, Michela, Chung, S. U., Cicuttin, A., Colantoni, M., Crespo, M. L., Torre, S. D., Das, S., Dasgupta, S. S., Denisov, O. Y., Dhara, L., Diaz, V., Donskov, S. V., Doshita, N., Duic, V., Dunnweber, W., Efremov, A., Alaoui, A. E., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Filin, A., Finger, M., Fischer, H., Franco, C., Friedrich, J. M., Garfagnini, R., Gautheron, F., Gavrichtchouk, O. P., Gazda, R., Gerassimov, S., Geyer, R., Giorgi, M., Gnesi, I., Gobbo, B., Goertz, S., Grabmuller, S., Grasso, Antonino, Grube, B., Gushterski, R., Guskov, A., Haas, F., Harrach, D. v., Hasegawa, T., Heinsius, F. H., Herrmann, F., Hess, C., Hinterberger, F., Horikawa, N., Hoppner, C., D'Hose, N., Ilgner, C., Ishimoto, S., Ivanov, O., Ivanshin, Y., Iwata, T., Jahn, R., Jasinski, P., Jegou, G., Joosten, R., Kabuss, E., Kang, D., Ketzer, B., Khaustov, G. V., Khokhlov, Y. A., Kisselev, Y., Klein, F., Klimaszewski, K., Koblitz, S., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Konigsmann, K., Konopka, R., Konorov, I., Konstantinov, V. F., Korzenev, A., Kotzinian, A. M., Kouznetsov, O., Kowalik, K., Kramer, M., Kral, A., Kroumchtein, Z. V., Kuhn, R., Kunne, F., Kurek, K., Lauser, L., Le Goff, J. M., Lednev, A. A., Lehmann, A., Levorato, S., Lichtenstadt, J., Liska, T., Maggiora, A., Maggiora, Marco, Magnon, A., Mallot, G. K., Mann, A., Marchand, C., Martin, A., Marzec, J., Massmann, F., Matsuda, T., Meyer, W., Michigami, T., Mikhailov, Y. V., Moinester, M. A., Mutter, A., Nagaytsev, A., Nagel, T., Nassalski, J., Negrini, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Nunes, A. S., Olshevsky, A. G., Ostrick, M., Padee, A., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Pawlukiewicz Kaminska, B., Perevalova, E., Pesaro, G., Peshekhonov, D. V., Piragino, G., Platchkov, S., Pochodzalla, J., Polak, J., Polyakov, V. A., Pontecorvo, G., Pretz, J., Quintans, C., Rajotte, J. F., Ramos, S., Rapatsky, V., Reicherz, G., Richter, A., Robinet, F., Rocco, E., Rondio, E., Ryabchikov, D. I., Samoylenko, V. D., Sandacz, A., Santos, H., Sapozhnikov, M. G., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, P., Schill, C., Schluter, T., Schmitt, L., Schopferer, S., Schroder, W., Shevchenko, O. Y., Siebert, H. W., Silva, L., Sinha, L., Sissakian, A. N., Slunecka, M., Smirnov, G. I., Sosio, Stefano, Sozzi, F., Srnka, A., Stolarski, M., Sulc, M., Sulej, R., Takekawa, S., Tessaro, S., Tessarotto, F., Teufel, A., Tkatchev, L. G., Uhl, S., Uman, I., Virius, M., Vlassov, N. V., Vossen, A., Weitzel, Q., Windmolders, R., Wislicki, W., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., Zhao, J., Zhuravlev, N., Zvyagin, A., Collaboration, C., Alekseev, M. G., Alexakhin, V. Y. u., Alexandrov, Y. u., Alexeev, G. D., Amoroso, A., Austregesilo, A., Badełek, B., Balestra, F., Barth, J., Baum, G., Bedfer, Y., Bernhard, J., Bertini, R., Bettinelli, M., Birsa, Renato, Bisplinghoff, J., Bordalo, P., Bradamante, Franco, Bravar, A., Bressan, Andrea, Brona, G., Burtin, E., Bussa, M. P., Chaberny, D., Chiosso, M., Chung, S. U., Cicuttin, A., Colantoni, M., Crespo, M. L., DALLA TORRE, Silvia, Das, S., Dasgupta, S. S., Denisov, O. Y. u., Dhara, L., Diaz, V., Donskov, S. V., Doshita, N., Duic, Venicio, Dünnweber, W., Efremov, A., El Alaoui, A., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Filin, A., Finger, M., Fischer, H., Franco, C., Friedrich, J. M., Garfagnini, R., Gautheron, F., Gavrichtchouk, O. P., Gazda, R., Gerassimov, S., Geyer, R., Giorgi, Marcello, Gnesi, I., Gobbo, B., Goertz, S., Grabmüller, S., Grasso, A., Grube, B., Gushterski, R., Guskov, A., Haas, F., von Harrach, D., Hasegawa, T., Heinsius, F. H., Herrmann, F., Heß, C., Hinterberger, F., Horikawa, N., Höppner, C. h., D'Hose, N., Ilgner, C., Ishimoto, S., Ivanov, O., Ivanshin, Y. u., Iwata, T., Jahn, R., Jasinski, P., Jegou, G., Joosten, R., Kabuß, E., Kang, D., Ketzer, B., Khaustov, G. V., Khokhlov, Y. u. A., Kisselev, Y. u., Klein, F., Klimaszewski, K., Koblitz, S., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Königsmann, K., Konopka, R., Konorov, I., Konstantinov, V. F., Korzenev, A., Kotzinian, A. M., Kouznetsov, O., Kowalik, K., Krämer, M., Kral, A., Kroumchtein, Z. V., Kuhn, R., Kunne, F., Kurek, K., Lauser, L., Le Goff, J. M., Lednev, A. A., Lehmann, A., Levorato, Stefano, Lichtenstadt, J., Liska, T., Maggiora, A., Maggiora, M., Magnon, A., Mallot, G. K., Mann, A., Marchand, C., Martin, Anna, Marzec, J., Massmann, F., Matsuda, T., Meyer, W., Michigami, T., Mikhailov, Y. u. V., Moinester, M. A., Mutter, A., Nagaytsev, A., Nagel, T., Nassalski, J., Negrini, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Nunes, A. S., Olshevsky, A. G., Ostrick, M., Padee, A., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Pawlukiewicz Kaminska, B., Perevalova, E., Pesaro, Giulia, Peshekhonov, D. V., Piragino, G., Platchkov, S., Pochodzalla, J., Polak, J., Polyakov, V. A., Pontecorvo, G., Pretz, J., Quintans, C., Rajotte, J. F., Ramos, S., Rapatsky, V., Reicherz, G., Richter, A., Robinet, F., Rocco, E., Rondio, E., Ryabchikov, D. I., Samoylenko, V. D., Sandacz, A., Santos, H., Sapozhnikov, M. G., Sarkar, S., Savin, I. A., Sbrizzai, Giulio, Schiavon, Paolo, Schill, C., Schlüter, T., Schmitt, L., Schopferer, S., Schröder, W., Shevchenko, O. Y. u., Siebert, H. W., Silva, L., Sinha, L., Sissakian, A. N., Slunecka, M., Smirnov, G. I., Sosio, S., Sozzi, Federica, Srnka, A., Stolarski, M., Sulc, M., Sulej, R., Takekawa, Stefano, Tessaro, S., Tessarotto, F., Teufel, A., Tkatchev, L. G., Uhl, S., Uman, I., Virius, M., Vlassov, N. V., Vossen, A., Weitzel, Q., Windmolders, R., Wiślicki, W., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., Zhao, J., Zhuravlev, N., and Zvyagin, A.
Subjects: angular distribution: asymmetry, Physics and Astronomy (miscellaneous), parton distribution functions, 160 GeV, FOS: Physical sciences, parton: distribution function, polarisation, NUCLEONS, muon deuteron: semi-inclusive reaction, 01 natural sciences, spin dependence, fragmentation function, COMPASS, x-dependence, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Experiment-HEP, 13.88.+e, LEPTOPRODUCTION, PROTON-SCATTERING, 0103 physical sciences, polarized target: longitudinal, DISTRIBUTIONS, lepton deep inelastic scattering, 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), charged particle: electroproduction, SEMIINCLUSIVE ELECTROPRODUCTION, DEEP-INELASTIC-SCATTERING, DIS, 010308 nuclear & particles physics, spin asymmetry, DEPENDENT STRUCTURE-FUNCTION, amplitude analysis, transverse momentum: dependence, CERN SPS, SINGLE-SPIN ASYMMETRIES, TARGET, High Energy Physics::Experiment, 13.85.Ni, 13.60.Hb, Particle Physics - Experiment, experimental results, 13.85.Hd
Abstract: Azimuthal asymmetries in semi-inclusive production of positive (h^+) and negative hadrons (h^-) have been measured by scattering 160 GeV muons off longitudinally polarised deuterons at CERN. The asymmetries were decomposed in several terms according to their expected modulation in the azimuthal angle phi of the outgoing hadron. Each term receives contributions from one or several spin and transverse-momentum-dependent parton distribution and fragmentation functions. The amplitudes of all phi-modulation terms of the hadron asymmetries integrated over the kinematic variables are found to be consistent with zero within statistical errors, while the constant terms are nonzero and equal for h^+ and h^- within the statistical errors. The dependencies of the phi-modulated terms versus the Bjorken momentum fraction x, the hadron fractional momentum z, and the hadron transverse momentum p_h^T were studied. The x dependence of the constant terms for both positive and negative hadrons is in agreement with the longitudinal double-spin hadron asymmetries, measured in semi-inclusive deep-inelastic scattering. The x dependence of the sin phi-modulation term is less pronounced than that in the corresponding HERMES data. All other dependencies of the phi-modulation amplitudes are consistent with zero within the statistical errors., 12 pages, 11 Figures; revision 1 signs in Eq 5 corrected, polished
Published: 2010

30. Observation of a J^PC = 1-+ exotic resonance in diffractive dissociation of 190 GeV/c pi- into pi- pi- pi+

Author: Alekseev, M. G., Alexakhin, V. Y. u., Alexandrov, Y. u., Alexeev, G. D., Amoroso, A., Austregesilo, A., Badełek, B., Balestra, F., Ball, J., Barth, J., Baum, G., Bedfer, Y., Bernhard, J., Bertini, R., Bettinelli, M., Birsa, Renato, Bisplinghoff, J., Bordalo, P., Bradamante, Franco, Bravar, A., Bressan, Andrea, Brona, G., Burtin, E., Bussa, M. P., Chapiro, A., Chiosso, M., Chung, S. U., Cicuttin, A., Colantoni, M., Crespo, M. L., DALLA TORRE, Silvia, Dafni, T., Das, S., Dasgupta, S. S., Denisov, O. Y. u., Dhara, L., Diaz, V., Dinkelbach, A. M., Donskov, S. V., Doshita, N., Duic, Venicio, Dünnweber, W., Efremov, A., El Alaoui, A., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Finger, M., Finger, M. J. r., Fischer, H., Franco, C., Friedrich, J. M., Garfagnini, R., Gautheron, F., Gavrichtchouk, O. P., Gazda, R., Gerassimov, S., Geyer, R., Giorgi, Marcello, Gobbo, B., Goertz, S., Grabmüller, S., Grajek, O. A., Grasso, A., Grube, B., Gushterski, R., Guskov, A., Haas, F., von Harrach, D., Hasegawa, T., Heckmann, J., Heinsius, F. H., Hermann, R., Herrmann, F., Heß, C., Hinterberger, F., Horikawa, N., Höppner, C. h., D'Hose, N., Ilgner, C., Ishimoto, S., Ivanov, O., Ivanshin, Y. u., Iwata, T., Jahn, R., Jasinski, P., Jegou, G., Joosten, R., Kabuß, E., Kang, D., Ketzer, B., Khaustov, G. V., Khokhlov, Y. u. A., Kisselev, Y. u., Klein, F., Klimaszewski, K., Koblitz, S., Koivuniemi, J. H., Kolosov, V. N., Komissarov, E. V., Kondo, K., Königsmann, K., Konopka, R., Konorov, I., Konstantinov, V. F., Korzenev, A., Kotzinian, A. M., Kouznetsov, O., Kowalik, K., Krämer, M., Kral, A., Kroumchtein, Z. V., Kuhn, R., Kunne, F., Kurek, K., Lauser, L., Le Goff, J. M., Lednev, A. A., Lehmann, A., Levorato, S., Lichtenstadt, J., Liska, T., Maggiora, A., Maggiora, M., Magnon, A., Mallot, G. K., Mann, A., Marchand, C., Marroncle, J., Martin, Anna, Marzec, J., Massmann, F., Matsuda, T., Maximov, A. N., Meyer, W., Michigami, T., Mikhailov, Y. u. V., Moinester, M. A., Mutter, A., Nagaytsev, A., Nagel, T., Nassalski, J., Negrini, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Olshevsky, A. G., Ostrick, M., Padee, A., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Pawlukiewicz Kaminska, B., Perevalova, E., Pesaro, G., Peshekhonov, D. V., Piragino, G., Platchkov, S., Pochodzalla, J., Polak, J., Polyakov, V. A., Pontecorvo, G., Pretz, J., Quintans, C., Rajotte, J. F., Ramos, S., Rapatsky, V., Reicherz, G., Reggiani, D., Richter, A., Robinet, F., Rocco, E., Rondio, E., Ryabchikov, D. I., Samoylenko, V. D., Sandacz, A., Santos, H., Sapozhnikov, M. G., Sarkar, S., Savin, I. A., Sbrizzai, Giulio, Schiavon, Paolo, Schill, C., Schlüter, T., Schmitt, L., Schopferer, S., Schröder, W., Shevchenko, O. Y. u., Siebert, H. W., Silva, L., Sinha, L., Sissakian, A. N., Slunecka, M., Smirnov, G. I., Sosio, S., Sozzi, Federica, Srnka, A., Stolarski, M., Sulc, M., Sulej, R., Takekawa, S., Tessaro, S., Tessarotto, F., Teufel, A., Tkatchev, L. G., Uhl, S., Uman, I., Venugopal, G., Virius, M., Vlassov, N. V., Vossen, A., Weitzel, Q., Windmolders, R., Wiślicki, W., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., Zhao, J., Zhuravlev, N., Zvyagin, A., Alekseev, M. G., Alexakhin, V. Y. u., Alexandrov, Y. u., Alexeev, G. D., Amoroso, A., Austregesilo, A., Badełek, B., Balestra, F., Ball, J., Barth, J., Baum, G., Bedfer, Y., Bernhard, J., Bertini, R., Bettinelli, M., Birsa, Renato, Bisplinghoff, J., Bordalo, P., Bradamante, Franco, Bravar, A., Bressan, Andrea, Brona, G., Burtin, E., Bussa, M. P., Chapiro, A., Chiosso, M., Chung, S. U., Cicuttin, A., Colantoni, M., Crespo, M. L., DALLA TORRE, Silvia, Dafni, T., Das, S., Dasgupta, S. S., Denisov, O. Y. u., Dhara, L., Diaz, V., Dinkelbach, A. M., Donskov, S. V., Doshita, N., Duic, Venicio, Dünnweber, W., Efremov, A., El Alaoui, A., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Finger, M., Finger, M. J. r., Fischer, H., Franco, C., Friedrich, J. M., Garfagnini, R., Gautheron, F., Gavrichtchouk, O. P., Gazda, R., Gerassimov, S., Geyer, R., Giorgi, Marcello, Gobbo, B., Goertz, S., Grabmüller, S., Grajek, O. A., Grasso, A., Grube, B., Gushterski, R., Guskov, A., Haas, F., von Harrach, D., Hasegawa, T., Heckmann, J., Heinsius, F. H., Hermann, R., Herrmann, F., Heß, C., Hinterberger, F., Horikawa, N., Höppner, C. h., D'Hose, N., Ilgner, C., Ishimoto, S., Ivanov, O., Ivanshin, Y. u., Iwata, T., Jahn, R., Jasinski, P., Jegou, G., Joosten, R., Kabuß, E., Kang, D., Ketzer, B., Khaustov, G. V., Khokhlov, Y. u. A., Kisselev, Y. u., Klein, F., Klimaszewski, K., Koblitz, S., Koivuniemi, J. H., Kolosov, V. N., Komissarov, E. V., Kondo, K., Königsmann, K., Konopka, R., Konorov, I., Konstantinov, V. F., Korzenev, A., Kotzinian, A. M., Kouznetsov, O., Kowalik, K., Krämer, M., Kral, A., Kroumchtein, Z. V., Kuhn, R., Kunne, F., Kurek, K., Lauser, L., Le Goff, J. M., Lednev, A. A., Lehmann, A., Levorato, S., Lichtenstadt, J., Liska, T., Maggiora, A., Maggiora, M., Magnon, A., Mallot, G. K., Mann, A., Marchand, C., Marroncle, J., Martin, Anna, Marzec, J., Massmann, F., Matsuda, T., Maximov, A. N., Meyer, W., Michigami, T., Mikhailov, Y. u. V., Moinester, M. A., Mutter, A., Nagaytsev, A., Nagel, T., Nassalski, J., Negrini, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Olshevsky, A. G., Ostrick, M., Padee, A., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Pawlukiewicz Kaminska, B., Perevalova, E., Pesaro, G., Peshekhonov, D. V., Piragino, G., Platchkov, S., Pochodzalla, J., Polak, J., Polyakov, V. A., Pontecorvo, G., Pretz, J., Quintans, C., Rajotte, J. F., Ramos, S., Rapatsky, V., Reicherz, G., Reggiani, D., Richter, A., Robinet, F., Rocco, E., Rondio, E., Ryabchikov, D. I., Samoylenko, V. D., Sandacz, A., Santos, H., Sapozhnikov, M. G., Sarkar, S., Savin, I. A., Sbrizzai, Giulio, Schiavon, Paolo, Schill, C., Schlüter, T., Schmitt, L., Schopferer, S., Schröder, W., Shevchenko, O. Y. u., Siebert, H. W., Silva, L., Sinha, L., Sissakian, A. N., Slunecka, M., Smirnov, G. I., Sosio, S., Sozzi, Federica, Srnka, A., Stolarski, M., Sulc, M., Sulej, R., Takekawa, S., Tessaro, S., Tessarotto, F., Teufel, A., Tkatchev, L. G., Uhl, S., Uman, I., Venugopal, G., Virius, M., Vlassov, N. V., Vossen, A., Weitzel, Q., Windmolders, R., Wiślicki, W., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., Zhao, J., Zhuravlev, N., and Zvyagin, A.
Subjects: MESON PRODUCTION, diffraction: dissociation, FOS: Physical sciences, COMPASS, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), mass: width, Experiment-HEP, 1960 GeV/c, 14.40.Rt, 14.40.Be, gluonic excitations, light meson spectrum, a2(1320), Nuclear Experiment, a1(1260), pi- nucleus: inclusive reaction, hybrids, lead, pi: multiple production, REST, hadron spectroscopy, mass spectrum: (pi+ 2pi-), exotic mesons, 12.39.Mk, partial wave analysis, resonance: exotic, CERN SPS, PARTICLE PHYSICS, HYBRID, STATES, DECAY, WAVE, VES, 13.25.Jx, pi2(1670), High Energy Physics::Experiment, Particle Physics - Experiment
Abstract: The COMPASS experiment at the CERN SPS has studied the diffractive dissociation of negative pions into the pi- pi- pi+ final state using a 190 GeV/c pion beam hitting a lead target. A partial wave analysis has been performed on a sample of 420000 events taken at values of the squared 4-momentum transfer t' between 0.1 and 1 GeV^2/c^2. The well-known resonances a1(1260), a2(1320), and pi2(1670) are clearly observed. In addition, the data show a significant natural parity exchange production of a resonance with spin-exotic quantum numbers J^PC = 1-+ at 1.66 GeV/c^2 decaying to rho pi. The resonant nature of this wave is evident from the mass-dependent phase differences to the J^PC = 2-+ and 1++ waves. From a mass-dependent fit a resonance mass of 1660 +- 10+0-64 MeV/c^2 and a width of 269+-21+42-64 MeV/c^2 is deduced., Comment: 7 page, 3 figures; version 2 gives some more details, data unchanged; version 3 updated authors, text shortened, data unchanged
Published: 2009
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31. Odd and Even Partial Waves of $��^-$ and $��'��^-$ in $��^-p\to��^{(\prime)}��^-p$ at $191\,\textrm{GeV}/c$

Author: Adolph, C., Akhunzyanov, R., Alexeev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Badelek, B., Balestra, F., Barth, J., Baum, G., Beck, R., Bedfer, Y., Berlin, A., Bernhard, J., Bicker, K., Bielert, E. R., Bieling, J., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, A., Buechele, M., Burtin, E., Capozza, L., Chiosso, M., Chung, S. U., Cicuttin, A., Crespo, M. L., Curiel, Q., Torre, S. Dalla, Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Donskov, S. V., Doshita, N., Duic, V., Duennweber, W., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Filin, A., Finger, M., Fischer, H., Franco, C., von Hohenesche, N. du Fresne, Friedrich, J. M., Frolov, V., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Geyer, R., Gnesi, I., Gobbo, B., Goertz, S., Gorzellik, M., Grabmueller, S., Grasso, A., Grube, B., Grussenmeyer, T., Guskov, A., Haas, F., von Harrach, D., Hahne, D., Hashimoto, R., Heinsius, F. H., Herrmann, F., Hinterberger, F., Hoeppner, Ch., Horikawa, N., d'Hose, N., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu., Iwata, T., Jahn, R., Jary, V., Jasinski, P., Joerg, P., Joosten, R., Kabuss, E., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O., Kraemer, M., Kroumchtein, Z. V., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levillain, M., Levorato, S., Lichtenstadt, J., Maggiora, A., Magnon, A., Makke, N., Mallot, G. K., Marchand, C., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Yu. V., Miyachi, Y., Nagaytsev, A., Nagel, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Novy, J., Nowak, W. -D., Nunes, A. S., Olshevsky, A. G., Orlov, I., Ostrick, M., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Peshekhonov, D. V., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Regali, C., Reicherz, G., Rocco, E., Rossiyskaya, N. S., Ryabchikov, D. I., Rychter, A., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, P., Schill, C., Schlueter, T., Schmidt, K., Schmieden, H., Schoenning, K., Schopferer, S., Schott, M., Shevchenko, O. Yu., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sosio, S., Sozzi, F., Srnka, A., Steiger, L., Stolarski, M., Sulc, M., Sulej, R., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, S., ter Wolbeek, J., Tessaro, S., Tessarotto, F., Thibaud, F., Uhl, S., Uman, I., Virius, M., Wang, L., Weisrock, T., Wilfert, M., Windmolders, R., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., and Zink, A.
Subjects: High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex)
Abstract: Exclusive production of $��^-$ and $��'��^-$ has been studied with a $191\,\textrm{GeV}/c$ $��^-$ beam impinging on a hydrogen target at COMPASS (CERN). Partial-wave analyses reveal different odd/even angular momentum ($L$) characteristics in the inspected invariant mass range up to $3\,\textrm{GeV}/c^2$. A striking similarity between the two systems is observed for the $L=2,4,6$ intensities (scaled by kinematical factors) and the relative phases. The known resonances $a_2(1320)$ and $a_4(2040)$ are in line with this similarity. In contrast, a strong enhancement of $��'��^-$ over $��^-$ is found for the $L=1,3,5$ waves, which carry non-$q\bar q$ quantum numbers. The $L=1$ intensity peaks at $1.7\,\textrm{GeV}/c^2$ in $��'��^-$ and at $1.4\,\textrm{GeV}/c^2$ in $��^-$, the corresponding phase motions with respect to $L=2$ are different., 16 pages, 5 figures and 1 table
Published: 2014
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32. Measurement of radiative widths of a2(1320) and π2(1670)

Author: Adolph, C., Andrieux, V., Bedfer, Y., Boer, M, Burtin, E., Capozza, L., Curiel, Q., Ferrero, A., d'Hose, N., Kunne, F., Magnon, A., Marchand, C., Neyret, D., Platchkov, S., Vandenbroucke, M., Wollny, H., Compass, Collaboration, Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and COMPASS
Subjects: High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract: International audience; The COMPASS Collaboration at CERN has investigated the reaction π − γ → π − π − π+ embedded in the Primakoff reaction of 190 GeV pions scattering in the Coulomb field of a lead target, π − Pb → π − π − π+Pb. Exchange of quasi-real photons is selected by isolating the sharp Coulomb peak observed at momentum transfer below 0.001 (GeV/c)2. Using a partial-wave analysis the amplitudes and relative phases of the a2(1320) and π2(1670) mesons have been extracted, and the Coulomb and the diffractive contributions have been disentangled. Measuring absolute production cross sections we have determined the radiative width of the a2(1320) to be Γ0(a2(1320) → πγ) = (358 ± 6stat ± 42syst) keV. As the first measurement, Γ0(π2(1670) → πγ) = (181 ± 11stat ± 27syst) keV · (BRPDG f2π /BRf2π) is obtained for the radiative width of the π2(1670), where in this analysis the branching ratio BRPDG f2π = 0.56 has been used. We compare these values to previous measurements and theoretical predictions.
Published: 2014

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

Author: Adolph, C., Andrieux, V., Bedfer, Y., Boer, M, Burtin, E., Capozza, L., Curiel, Q., Ferrero, A., d'Hose, N., Kunne, F., Levillain, M., Magnon, A., Marchand, C., Neyret, D., Platchkov, S., Wollny, H., Compass, Collaboration, Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and COMPASS
Subjects: High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: International audience; A measurement of the azimuthal asymmetry in dihadron production in deep-inelastic scattering of muons on transversely polarised proton (NH3) targets is presented. They provide independent access to the transversity distribution functions through the measurement of the Collins asymmetry in single hadron production. The data were taken in the year 2010 with the COMPASS spectrometer using a 160 GeV/c muon beam of the CERN SPS, increasing by a factor of about four the overall statistics with respect to the previously published data taken in the year 2007. The measured sizeable asymmetry is in good agreement with the published data. An approximate equality of the Collins asymmetry and the dihadron asymmetry is observed, suggesting a common physical mechanism in the underlying fragmentation.
Published: 2014

34. Spin alignment and violation of the OZI rule in exclusive omega and phi production in pp collisions

Author: Adolph, C., Andrieux, V., Bedfer, Y., Boer, M, Burtin, E., Capozza, L., Curiel, Q., Ferrero, A., d'Hose, N., Kunne, F., Levillain, M., Magnon, A., Marchand, C., Neyret, D., Platchkov, S., Wollny, H., Compass, Collaboration, Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and COMPASS
Subjects: Nuclear Theory, High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: International audience; Exclusive production of the isoscalar vector mesons omega and phi is measured with a 190 GeV/c proton beam impinging on a liquid hydrogen target. Cross section ratios are determined in three intervals of the Feynman variable x(F) of the fast proton. A significant violation of the OZI rule is found, confirming earlier findings. Its kinematic dependence on xF and on the invariant mass M-pV of the system formed by fast proton p(fast) and vector meson V is discussed in terms of diffractive production of p(fast) V resonances in competition with central production. The measurement of the spin density matrix element rho(00) of the vector mesons in different selected reference frames provides another handle to distinguish the contributions of these two major reaction types. Again, dependences of the alignment on x(F) and on M-pV are found. Most of the observations can be traced back to the existence of several excited baryon states contributing to omega production which are absent in the case of the phi meson. Removing the low-mass M-pV resonant region, the OZI rule is found to be violated by a factor of eight, independently of x(F).
Published: 2014

35. Measurement of radiative widths of $a_2(1320)$ and $��_2(1670)$

Author: Adolph, C., Akhunzyanov, R., Alekseev, M. G., Alexeev, G. D., Amoroso, A., Andrieux, V., Anosov, V., Austregesilo, A., Badelek, B., Balestra, F., Barth, J., Baum, G., Beck, R., Bedfer, Y., Berlin, A., Bernhard, J., Bicker, K., Bieling, J., Birsa, R., Bisplinghoff, J., Bodlak, M., Boer, M., Bordalo, P., Bradamante, F., Braun, C., Bressan, A., Buechele, M., Burtin, E., Capozza, L., Chiosso, M., Chung, S. U., Cicuttin, A., Crespo, M. L., Curiel, Q., Torre, S. Dalla, Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Donskov, S. V., Doshita, N., Duic, V., Duennweber, W., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Filin, A., Finger, M., Finger~jr., M., Fischer, H., Franco, C., du~Fresne~von~Hohenesche, N., Friedrich, J. M., Frolov, V., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Geyer, R., Gnesi, I., Gobbo, B., Goertz, S., Gorzellik, M., Grabmueller, S., Grasso, A., Grube, B., Guskov, A., Guthoerl, T., Haas, F., von Harrach, D., Hahne, D., Hashimoto, R., Heinsius, F. H., Herrmann, F., Hinterberger, F., Hoeppner, Ch., Horikawa, N., d'Hose, N., Huber, S., Ishimoto, S., Ivanov, A., Ivanshin, Yu., Iwata, T., Jahn, R., Jary, V., Jasinski, P., Joerg, P., Joosten, R., Kabuss, E., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O., Kral, Z., Kraemer, M., Kroumchtein, Z. V., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levorato, S., Lichtenstadt, J., Maggiora, A., Magnon, A., Makke, N., Mallot, G. K., Marchand, C., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Yu. V., Miyachi, Y., Nagaytsev, A., Nagel, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Novy, J., Nowak, W. -D., Nunes, A. S., Orlov, I., Olshevsky, A. G., Ostrick, M., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Pesek, M., Platchkov, S., Pochodzalla, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Reicherz, G., Rocco, E., Rychter, A., Rossiyskaya, N. S., Ryabchikov, D. I., Samoylenko, V. D., Sandacz, A., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, P., Schill, C., Schlueter, T., Schmidt, A., Schmidt, K., Schmieden, H., Schoenning, K., Schopferer, S., Schott, M., Shevchenko, O. Yu., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sosio, S., Sozzi, F., Srnka, A., Steiger, L., Stolarski, M., Sulc, M., Sulej, R., Suzuki, H., Szabelski, A., Szameitat, T., Sznajder, P., Takekawa, S., ter~Wolbeek, J., Tessaro, S., Tessarotto, F., Thibaud, F., Uhl, S., Uman, I., Vandenbroucke, M., Virius, M., Vondra, J., Wang, L., Weisrock, T., Wilfert, M., Windmolders, R., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., and Ziembicki., M.
Subjects: High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Computer Science::Discrete Mathematics, Mathematics::Analysis of PDEs, FOS: Physical sciences, High Energy Physics::Experiment, Physics::Atomic Physics, Nuclear Experiment
Abstract: The COMPASS Collaboration at CERN has investigated the reaction $��^- ��\rightarrow ��^-��^-��^+$ embedded in the Primakoff reaction of $190~\textrm{GeV}$ pions scattering in the Coulomb field of a lead target, $��^- \text{Pb} \rightarrow ��^-��^-��^+ \text{Pb}$. Exchange of quasi-real photons is selected by isolating the sharp Coulomb peak observed at momentum transfer below $0.001~(\text{GeV}/c)^2$. Using a partial-wave analysis the amplitudes and relative phases of the $a_2(1320)$ and $��_2(1670)$ mesons have been extracted, and the Coulomb and the diffractive contributions have been disentangled. Measuring absolute production cross sections we have determined the radiative width of the $a_2(1320)$ to be $��_0(a_2(1320) \rightarrow ��) = (358 \pm 6_{\textrm{stat}} \pm 42_{\textrm{syst}})~\textrm{keV}$. As the first measurement, $��_0(��_2(1670) \rightarrow ��) = (181 \pm 11_{\textrm{stat}} \pm 27_{\textrm{syst}})~\textrm{keV} \cdot (\textrm{BR}^{\textrm{PDG}}_{f_2 ��}/\textrm{BR}_{f_2 ��})$ is obtained for the radiative width of the $��_2(1670)$, where in this analysis the branching ratio $\textrm{BR}^{\textrm{PDG}}_{f_2 ��}=0.56$ has been used. We compare these values to previous measurements and theoretical predictions., 27 pages, 12 figures and 3 tables
Published: 2014
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36. Measurement of azimuthal hadron asymmetries in semi-inclusive deep inelastic scattering off unpolarised nucleons

Author: Adolph, C., Andrieux, V., Bedfer, Y., Boer, M, Burtin, E., Capozza, L., Curiel, Q., Ferrero, A., d'Hose, N., Kunne, F., Levillain, M., Magnon, A., Marchand, C., Neyret, D., Platchkov, S., Wollny, H., Compass, Collaboration, Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and COMPASS
Subjects: High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: International audience; Spin-averaged asymmetries in the azimuthal distributions of positive and negative hadrons produced in deep inelastic scattering were measured using the CERN SPS longitudinally polarised muon beam at 160GeV/cand a 6LiD target. The amplitudes of the three azimuthal modulations cosφh, cos2φhand sinφhwere obtained binning the data separately in each of the relevant kinematic variables x, zor phTand binning in a three-dimensional grid of these three variables. The amplitudes of the cosφhand cos2φhmodulations show strong kinematic dependencies both for positive and negative hadrons.
Published: 2014

37. Transverse target spin asymmetries in exclusive rho(0) muoproduction

Author: Adolph, C., Andrieux, V., Bedfer, Y., Boer, M, Burtin, E., Capozza, L., Curiel, Q., Ferrero, A., d'Hose, N., Kunne, F., Magnon, A., Marchand, C., Neyret, D., Platchkov, S., Compass, Collaboration, Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and COMPASS
Subjects: High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: International audience; Exclusive production of rho(0) 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 as a function of Q(2), x(Bj), or p(T)(2). The sin Os asymmetry is found to be -0.019 +/- 0.008(stat.) +/- 0.003(syst.). All other asymmetries are also found to be of small magnitude and consistent with zero within experimental uncertainties. Very recent calculations using a GPD-based model agree well with the present results. The data is interpreted as evidence for the existence of chiral-odd, transverse generalized parton distributions.
Published: 2014

38. Fast photon detection for particle identification with COMPASS RICH-1

Author: ABBON P, ALEKSEEV M, ANGERER H, APOLLONIO M, BIRSA R, BORDALO P, BUSSO L, CHIOSSO M, COLANTONI M. L, COSTA S, DALLA TORRE S, DAFNI T, DELAGNES E, DESCHAMPS H, DIAZ V, DIBIASE N, DUIC V, EYRICH W, FASO D, FERRERO A, FINGER M, FINGER M. JR, FISCHER H, GERASSIMOV S, GOBBO B, HAGEMANN R, VON HARRACH D, HEINSIUS F. H, HORIKAWA S, JOOSTEN R, KETZER B, KÖNIGSMANN K, KOLOSOV V. N, KONOROV I, KRAMER D, KUNNE F, LEHMANN A, MAGGI, ORA A, MAGNON A, MANN A, MENON G, MUTTER A, NÄHLE O, NERLING F, NEYRET D, PAGANO P, PANEBIANCO S, PANZIERI D, PAUL S, PESARO G, POLAK J, REBOURGEARD P, ROBINET F, ROCCO E, SCHILL C, SCHRÖDER W, SILVA L, SLUNECKA M, SOZZI F, STEIGER L, SULC M, SVEC M, TESSAROTTO F, TEUFEL A, WOLLNY H., BRADAMANTE, FRANCO, BRESSAN, Andrea, CILIBERTI, PIERO, GIORGI, MARCELLO, LEVORATO, STEFANO, MARTIN, ANNA, SCHIAVON, PAOLO, Abbon, P, Alekseev, M, Angerer, H, Apollonio, M, Birsa, R, Bordalo, P, Bradamante, Franco, Bressan, Andrea, Busso, L, Chiosso, M, Ciliberti, Piero, COLANTONI M., L, Costa, S, DALLA TORRE, S, Dafni, T, Delagnes, E, Deschamps, H, Diaz, V, Dibiase, N, Duic, V, Eyrich, W, Faso, D, Ferrero, A, Finger, M, FINGER M., Jr, Fischer, H, Gerassimov, S, Giorgi, Marcello, Gobbo, B, Hagemann, R, VON HARRACH, D, HEINSIUS F., H, Horikawa, S, Joosten, R, Ketzer, B, Königsmann, K, KOLOSOV V., N, Konorov, I, Kramer, D, Kunne, F, Lehmann, A, Levorato, Stefano, Maggi, Ora, A, Magnon, A, Mann, A, Martin, Anna, Menon, G, Mutter, A, Nähle, O, Nerling, F, Neyret, D, Pagano, P, Panebianco, S, Panzieri, D, Paul, S, Pesaro, G, Polak, J, Rebourgeard, P, Robinet, F, Rocco, E, Schiavon, Paolo, Schill, C, Schröder, W, Silva, L, Slunecka, M, Sozzi, F, Steiger, L, Sulc, M, Svec, M, Tessarotto, F, Teufel, A, and Wollny, H.
Subjects: Accelerator Physics (physics.acc-ph), Nuclear and High Energy Physics, Photomultiplier, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Cherenkov detector, Other Fields of Physics, FOS: Physical sciences, COMPASS, RICH, Multi-anode PMT, Particle identification, Photocathode, law.invention, Nuclear physics, Optics, law, Compass, Instrumentation, Cherenkov radiation, Physics, business.industry, Detector, Instrumentation and Detectors (physics.ins-det), Upgrade, Physics - Accelerator Physics, High Energy Physics::Experiment, business
Abstract: Particle identification at high rates is an important challenge for many current and future high-energy physics experiments. The upgrade of the COMPASS RICH-1 detector requires a new technique for Cherenkov photon detection at count rates of several $10^6$ per channel in the central detector region, and a read-out system allowing for trigger rates of up to 100 kHz. To cope with these requirements, the photon detectors in the central region have been replaced with the detection system described in this paper. In the peripheral regions, the existing multi-wire proportional chambers with CsI photocathode are now read out via a new system employing APV pre-amplifiers and flash ADC chips. The new detection system consists of multi-anode photomultiplier tubes (MAPMT) and fast read-out electronics based on the MAD4 discriminator and the F1-TDC chip. The RICH-1 is in operation in its upgraded version for the 2006 CERN SPS run. We present the photon detection design, constructive aspects and the first Cherenkov light in the detector., Comment: Proceedings of the Imaging 2006 conference, Stockholm, Sweden, 27-30 June 2006, 5 pages, 6 figures, to appear in NIM A; corrected typo in caption of Fig.6
Published: 2007

39. Transverse target spin asymmetries in exclusive $\rho^0$ muoproduction

Author: Adolph, C.Universität Erlangen–Nürnberg, Physikalisches Institut, 91054 Erlangen, Germany 10, Akhunzyanov, R.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Alekseev, M.G.(Trieste Section of INFN, 34127 Trieste, Italy), Alexakhin, V.Yu.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Alexandrov, Yu.(Lebedev Physical Institute, 119991 Moscow, Russia), Alexeev, G.D.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Amoroso, A.(University of Turin, Department of Physics, 10125 Turin, Italy), Andrieux, V.(CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France 17), Anosov, V.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Austregesilo, A.(CERN, 1211 Geneva 23, Switzerland), Badełek, B.(University of Warsaw, Faculty of Physics, 00-681 Warsaw, Poland 19), Balestra, F.(University of Turin, Department of Physics, 10125 Turin, Italy), Barth, J.(Universität Bonn, Physikalisches Institut, 53115 Bonn, Germany 10), Baum, G.(Universität Bielefeld Fakultät für Physik, 33501 Bielefeld, Germany 10 10 Supported by the German Bundesministerium für Bildung und Forschung.), Beck, R.(Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, 53115 Bonn, Germany 10), Bedfer, Y.(CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France 17), Berlin, A.(Universität Bochum, Institut für Experimentalphysik, 44780 Bochum, Germany 10 17 17 Supported by EU FP7 (HadronPhysics3, Grant Agreement number 283286).), Bernhard, J.(Universität Mainz, Institut für Kernphysik, 55099 Mainz, Germany 10), Bertini, R.(University of Turin, Department of Physics, 10125 Turin, Italy), Bicker, K.(CERN, 1211 Geneva 23, Switzerland), Bieling, J.(Universität Bonn, Physikalisches Institut, 53115 Bonn, Germany 10), Birsa, R.(Trieste Section of INFN, 34127 Trieste, Italy), Bisplinghoff, J.(Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, 53115 Bonn, Germany 10), Bodlak, M.(Charles University in Prague, Faculty of Mathematics and Physics, 18000 Prague, Czech Republic 11), Boer, M.(CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France 17), Bordalo, P.(LIP, 1000-149 Lisbon, Portugal 14 14 Supported by the Portuguese FCT – Fundação para a Ciência e Tecnologia, COMPETE and QREN, Grants CERN/FP/109323/2009, CERN/FP/116376/2010 and CERN/FP/123600/2011.), Bradamante, F.(University of Trieste, Department of Physics, 34127 Trieste, Italy), Braun, C.(Universität Erlangen–Nürnberg, Physikalisches Institut, 91054 Erlangen, Germany 10), Bravar, A.(Trieste Section of INFN, 34127 Trieste, Italy), Bressan, A.(University of Trieste, Department of Physics, 34127 Trieste, Italy), Büchele, M.(Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany 10 17), Burtin, E.(CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France 17), Capozza, L.(CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France 17), Chiosso, M.(University of Turin, Department of Physics, 10125 Turin, Italy), Chung, S.U.(Technische Universität München, Physik Department, 85748 Garching, Germany 10 16), Cicuttin, A.(Abdus Salam ICTP, 34151 Trieste, Italy), Crespo, M.L.(Abdus Salam ICTP, 34151 Trieste, Italy), Curiel, Q.(CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France 17), Dalla Torre, S.(Trieste Section of INFN, 34127 Trieste, Italy), Dasgupta, S.S.(Matrivani Institute of Experimental Research & Education, Calcutta-700 030, India 12 12 Supported by SAIL (CSR), Govt. of India.), Dasgupta, S.(Trieste Section of INFN, 34127 Trieste, Italy), Denisov, O.Yu.(Torino Section of INFN, 10125 Turin, Italy), Donskov, S.V.(State Research Center of the Russian Federation, Institute for High Energy Physics, 142281 Protvino, Russia), Doshita, N.(Yamagata University, Yamagata, 992-8510, Japan 15), Duic, V.(University of Trieste, Department of Physics, 34127 Trieste, Italy), Dünnweber, W.(Ludwig-Maximilians-Universität München, Department für Physik, 80799 Munich, Germany 10 16 16 Supported by the DFG cluster of excellence ‘Origin and Structure of the Universe’ ( www.universe-cluster.de ).), Dziewiecki, M.(Warsaw University of Technology, Institute of Radioelectronics, 00-665 Warsaw, Poland 19), Efremov, A.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Elia, C.(University of Trieste, Department of Physics, 34127 Trieste, Italy), Eversheim, P.D.(Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, 53115 Bonn, Germany 10), Eyrich, W.(Universität Erlangen–Nürnberg, Physikalisches Institut, 91054 Erlangen, Germany 10), Faessler, M.(Ludwig-Maximilians-Universität München, Department für Physik, 80799 Munich, Germany 10 16 16 Supported by the DFG cluster of excellence ‘Origin and Structure of the Universe’ ( www.universe-cluster.de ).), Ferrero, A.(CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France 17), Filin, A.(State Research Center of the Russian Federation, Institute for High Energy Physics, 142281 Protvino, Russia), Finger, M.(Charles University in Prague, Faculty of Mathematics and Physics, 18000 Prague, Czech Republic 11), Fischer, H.(Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany 10 17), Franco, C.(LIP, 1000-149 Lisbon, Portugal 14 14 Supported by the Portuguese FCT – Fundação para a Ciência e Tecnologia, COMPETE and QREN, Grants CERN/FP/109323/2009, CERN/FP/116376/2010 and CERN/FP/123600/2011.), du Fresne von Hohenesche, N.(Universität Mainz, Institut für Kernphysik, 55099 Mainz, Germany 10), Friedrich, J.M.(Technische Universität München, Physik Department, 85748 Garching, Germany 10 16), Frolov, V.(CERN, 1211 Geneva 23, Switzerland), Garfagnini, R.(University of Turin, Department of Physics, 10125 Turin, Italy), Gautheron, F.(Universität Bochum, Institut für Experimentalphysik, 44780 Bochum, Germany 10 17 17 Supported by EU FP7 (HadronPhysics3, Grant Agreement number 283286).), Gavrichtchouk, O.P.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Gerassimov, S.(Lebedev Physical Institute, 119991 Moscow, Russia), Geyer, R.(Ludwig-Maximilians-Universität München, Department für Physik, 80799 Munich, Germany 10 16 16 Supported by the DFG cluster of excellence ‘Origin and Structure of the Universe’ ( www.universe-cluster.de ).), Giorgi, M.(University of Trieste, Department of Physics, 34127 Trieste, Italy), Gnesi, I.(University of Turin, Department of Physics, 10125 Turin, Italy), Gobbo, B.(Trieste Section of INFN, 34127 Trieste, Italy), Goertz, S.(Universität Bonn, Physikalisches Institut, 53115 Bonn, Germany 10), Gorzellik, M.(Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany 10 17), Grabmüller, S.(Technische Universität München, Physik Department, 85748 Garching, Germany 10 16), Grasso, A.(University of Turin, Department of Physics, 10125 Turin, Italy), Grube, B.(Technische Universität München, Physik Department, 85748 Garching, Germany 10 16), Gushterski, R.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Guskov, A.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Guthörl, T.(Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany 10 17), Haas, F.(Technische Universität München, Physik Department, 85748 Garching, Germany 10 16), von Harrach, D.(Universität Mainz, Institut für Kernphysik, 55099 Mainz, Germany 10), Hahne, D.(Universität Bonn, Physikalisches Institut, 53115 Bonn, Germany 10), Hashimoto, R.(Yamagata University, Yamagata, 992-8510, Japan 15), Heinsius, F.H.(Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany 10 17), Herrmann, F.(Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany 10 17), Heß, C.(Universität Bochum, Institut für Experimentalphysik, 44780 Bochum, Germany 10 17 17 Supported by EU FP7 (HadronPhysics3, Grant Agreement number 283286).), Hinterberger, F.(Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, 53115 Bonn, Germany 10), Höppner, Ch.(Technische Universität München, Physik Department, 85748 Garching, Germany 10 16), Horikawa, N.(Nagoya University, 464 Nagoya, Japan 15), d'Hose, N.(CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France 17), Huber, S.(Technische Universität München, Physik Department, 85748 Garching, Germany 10 16), Ishimoto, S.(Yamagata University, Yamagata, 992-8510, Japan 15), Ivanov, A.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Ivanshin, Yu.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Iwata, T.(Yamagata University, Yamagata, 992-8510, Japan 15), Jahn, R.(Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, 53115 Bonn, Germany 10), Jary, V.(Czech Technical University in Prague, 16636 Prague, Czech Republic 11), Jasinski, P.(Universität Mainz, Institut für Kernphysik, 55099 Mainz, Germany 10), Joerg, P.(Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany 10 17), Joosten, R.(Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, 53115 Bonn, Germany 10), Kabuß, E.(Universität Mainz, Institut für Kernphysik, 55099 Mainz, Germany 10), Kang, D.(Universität Mainz, Institut für Kernphysik, 55099 Mainz, Germany 10), Ketzer, B.(Technische Universität München, Physik Department, 85748 Garching, Germany 10 16), Khaustov, G.V.(State Research Center of the Russian Federation, Institute for High Energy Physics, 142281 Protvino, Russia), Khokhlov, Yu.A.(State Research Center of the Russian Federation, Institute for High Energy Physics, 142281 Protvino, Russia), Kisselev, Yu.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Klein, F.(Universität Bonn, Physikalisches Institut, 53115 Bonn, Germany 10), Klimaszewski, K.(National Centre for Nuclear Research, 00-681 Warsaw, Poland 19 19 Supported by the Polish NCN Grant DEC-2011/01/M/ST2/02350.), Koivuniemi, J.H.(Universität Bochum, Institut für Experimentalphysik, 44780 Bochum, Germany 10 17 17 Supported by EU FP7 (HadronPhysics3, Grant Agreement number 283286).), Kolosov, V.N.(State Research Center of the Russian Federation, Institute for High Energy Physics, 142281 Protvino, Russia), Kondo, K.(Yamagata University, Yamagata, 992-8510, Japan 15), Königsmann, K.(Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany 10 17), Konorov, I.(Lebedev Physical Institute, 119991 Moscow, Russia), Konstantinov, V.F.(State Research Center of the Russian Federation, Institute for High Energy Physics, 142281 Protvino, Russia), Kotzinian, A.M.(University of Turin, Department of Physics, 10125 Turin, Italy), Kouznetsov, O.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Kral, Z.(Czech Technical University in Prague, 16636 Prague, Czech Republic 11), Krämer, M.(Technische Universität München, Physik Department, 85748 Garching, Germany 10 16), Kroumchtein, Z.V.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Kuchinski, N.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Kunne, F.(CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France 17), Kurek, K.(National Centre for Nuclear Research, 00-681 Warsaw, Poland 19 19 Supported by the Polish NCN Grant DEC-2011/01/M/ST2/02350.), Kurjata, R.P.(Warsaw University of Technology, Institute of Radioelectronics, 00-665 Warsaw, Poland 19), Lednev, A.A.(State Research Center of the Russian Federation, Institute for High Energy Physics, 142281 Protvino, Russia), Lehmann, A.(Universität Erlangen–Nürnberg, Physikalisches Institut, 91054 Erlangen, Germany 10), Levorato, S.(Trieste Section of INFN, 34127 Trieste, Italy), Lichtenstadt, J.(Tel Aviv University, School of Physics and Astronomy, 69978 Tel Aviv, Israel 18 18 Supported by the Israel Science Foundation, founded by the Israel Academy of Sciences and Humanities.), Maggiora, A.(Torino Section of INFN, 10125 Turin, Italy), Magnon, A.(CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France 17), Makke, N.(University of Trieste, Department of Physics, 34127 Trieste, Italy), Mallot, G.K.(CERN, 1211 Geneva 23, Switzerland), Marchand, C.(CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France 17), Martin, A.(University of Trieste, Department of Physics, 34127 Trieste, Italy), Marzec, J.(Warsaw University of Technology, Institute of Radioelectronics, 00-665 Warsaw, Poland 19), Matousek, J.(Charles University in Prague, Faculty of Mathematics and Physics, 18000 Prague, Czech Republic 11), Matsuda, H.(Yamagata University, Yamagata, 992-8510, Japan 15), Matsuda, T.(University of Miyazaki, Miyazaki 889-2192, Japan 15 15 Supported by the MEXT and the JSPS under the Grants Nos. 18002006, 20540299 and 18540281, Daiko Foundation and Yamada Foundation.), Meshcheryakov, G.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Meyer, W.(Universität Bochum, Institut für Experimentalphysik, 44780 Bochum, Germany 10 17 17 Supported by EU FP7 (HadronPhysics3, Grant Agreement number 283286).), Michigami, T.(Yamagata University, Yamagata, 992-8510, Japan 15), Mikhailov, Yu.V.(State Research Center of the Russian Federation, Institute for High Energy Physics, 142281 Protvino, Russia), Miyachi, Y.(Yamagata University, Yamagata, 992-8510, Japan 15), Nagaytsev, A.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Nagel, T.(Technische Universität München, Physik Department, 85748 Garching, Germany 10 16), Nerling, F.(Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany 10 17), Neubert, S.(Technische Universität München, Physik Department, 85748 Garching, Germany 10 16), Neyret, D.(CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France 17), Nikolaenko, V.I.(State Research Center of the Russian Federation, Institute for High Energy Physics, 142281 Protvino, Russia), Novy, J.(Czech Technical University in Prague, 16636 Prague, Czech Republic 11), Nowak, W.-D.(Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany 10 17), Nunes, A.S.(LIP, 1000-149 Lisbon, Portugal 14 14 Supported by the Portuguese FCT – Fundação para a Ciência e Tecnologia, COMPETE and QREN, Grants CERN/FP/109323/2009, CERN/FP/116376/2010 and CERN/FP/123600/2011.), Orlov, I.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Olshevsky, A.G.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Ostrick, M.(Universität Mainz, Institut für Kernphysik, 55099 Mainz, Germany 10), Panknin, R.(Universität Bonn, Physikalisches Institut, 53115 Bonn, Germany 10), Panzieri, D.(University of Eastern Piedmont, 15100 Alessandria, Italy), Parsamyan, B.(University of Turin, Department of Physics, 10125 Turin, Italy), Paul, S.(Technische Universität München, Physik Department, 85748 Garching, Germany 10 16), Pesek, M.(Charles University in Prague, Faculty of Mathematics and Physics, 18000 Prague, Czech Republic 11), Peshekhonov, D.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Piragino, G.(University of Turin, Department of Physics, 10125 Turin, Italy), Platchkov, S.(CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France 17), Pochodzalla, J.(Universität Mainz, Institut für Kernphysik, 55099 Mainz, Germany 10), Polak, J.(Technical University in Liberec, 46117 Liberec, Czech Republic 11), Polyakov, V.A.(State Research Center of the Russian Federation, Institute for High Energy Physics, 142281 Protvino, Russia), Pretz, J.(Universität Bonn, Physikalisches Institut, 53115 Bonn, Germany 10), Quaresma, M.(LIP, 1000-149 Lisbon, Portugal 14 14 Supported by the Portuguese FCT – Fundação para a Ciência e Tecnologia, COMPETE and QREN, Grants CERN/FP/109323/2009, CERN/FP/116376/2010 and CERN/FP/123600/2011.), Quintans, C.(LIP, 1000-149 Lisbon, Portugal 14 14 Supported by the Portuguese FCT – Fundação para a Ciência e Tecnologia, COMPETE and QREN, Grants CERN/FP/109323/2009, CERN/FP/116376/2010 and CERN/FP/123600/2011.), Ramos, S.(LIP, 1000-149 Lisbon, Portugal 14 14 Supported by the Portuguese FCT – Fundação para a Ciência e Tecnologia, COMPETE and QREN, Grants CERN/FP/109323/2009, CERN/FP/116376/2010 and CERN/FP/123600/2011.), Reicherz, G.(Universität Bochum, Institut für Experimentalphysik, 44780 Bochum, Germany 10 17 17 Supported by EU FP7 (HadronPhysics3, Grant Agreement number 283286).), Rocco, E.(CERN, 1211 Geneva 23, Switzerland), Rodionov, V.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Rondio, E.(National Centre for Nuclear Research, 00-681 Warsaw, Poland 19 19 Supported by the Polish NCN Grant DEC-2011/01/M/ST2/02350.), Rossiyskaya, N.S.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Ryabchikov, D.I.(State Research Center of the Russian Federation, Institute for High Energy Physics, 142281 Protvino, Russia), Samoylenko, V.D.(State Research Center of the Russian Federation, Institute for High Energy Physics, 142281 Protvino, Russia), Sandacz, A.(National Centre for Nuclear Research, 00-681 Warsaw, Poland 19 19 Supported by the Polish NCN Grant DEC-2011/01/M/ST2/02350.), Sapozhnikov, M.G.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Sarkar, S.(Matrivani Institute of Experimental Research & Education, Calcutta-700 030, India 12 12 Supported by SAIL (CSR), Govt. of India.), Savin, I.A.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Sbrizzai, G.(University of Trieste, Department of Physics, 34127 Trieste, Italy), Schiavon, P.(University of Trieste, Department of Physics, 34127 Trieste, Italy), Schill, C.(Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany 10 17), Schlüter, T.(Ludwig-Maximilians-Universität München, Department für Physik, 80799 Munich, Germany 10 16 16 Supported by the DFG cluster of excellence ‘Origin and Structure of the Universe’ ( www.universe-cluster.de ).), Schmidt, A.(Universität Erlangen–Nürnberg, Physikalisches Institut, 91054 Erlangen, Germany 10), Schmidt, K.(Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany 10 17), Schmitt, L.(Technische Universität München, Physik Department, 85748 Garching, Germany 10 16), Schmïden, H.(Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, 53115 Bonn, Germany 10), Schönning, K.(CERN, 1211 Geneva 23, Switzerland), Schopferer, S.(Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany 10 17), Schott, M.(CERN, 1211 Geneva 23, Switzerland), Shevchenko, O.Yu.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Silva, L.(LIP, 1000-149 Lisbon, Portugal 14 14 Supported by the Portuguese FCT – Fundação para a Ciência e Tecnologia, COMPETE and QREN, Grants CERN/FP/109323/2009, CERN/FP/116376/2010 and CERN/FP/123600/2011.), Sinha, L.(Matrivani Institute of Experimental Research & Education, Calcutta-700 030, India 12 12 Supported by SAIL (CSR), Govt. of India.), Sirtl, S.(Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany 10 17), Slunecka, M.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Sosio, S.(University of Turin, Department of Physics, 10125 Turin, Italy), Sozzi, F.(Trieste Section of INFN, 34127 Trieste, Italy), Srnka, A.(Institute of Scientific Instruments, AS CR, 61264 Brno, Czech Republic 11 11 Supported by Czech Republic MEYS Grants ME492 and LA242.), Steiger, L.(Trieste Section of INFN, 34127 Trieste, Italy), Stolarski, M.(LIP, 1000-149 Lisbon, Portugal 14 14 Supported by the Portuguese FCT – Fundação para a Ciência e Tecnologia, COMPETE and QREN, Grants CERN/FP/109323/2009, CERN/FP/116376/2010 and CERN/FP/123600/2011.), Sulc, M.(Technical University in Liberec, 46117 Liberec, Czech Republic 11), Sulej, R.(National Centre for Nuclear Research, 00-681 Warsaw, Poland 19 19 Supported by the Polish NCN Grant DEC-2011/01/M/ST2/02350.), Suzuki, H.(Yamagata University, Yamagata, 992-8510, Japan 15), Szabelski, A.(National Centre for Nuclear Research, 00-681 Warsaw, Poland 19 19 Supported by the Polish NCN Grant DEC-2011/01/M/ST2/02350.), Szameitat, T.(Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany 10 17), Sznajder, P.(National Centre for Nuclear Research, 00-681 Warsaw, Poland 19 19 Supported by the Polish NCN Grant DEC-2011/01/M/ST2/02350.), Takekawa, S.(Torino Section of INFN, 10125 Turin, Italy), Ter Wolbeek, J.(Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany 10 17), Tessaro, S.(Trieste Section of INFN, 34127 Trieste, Italy), Tessarotto, F.(Trieste Section of INFN, 34127 Trieste, Italy), Thibaud, F.(CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France 17), Uhl, S.(Technische Universität München, Physik Department, 85748 Garching, Germany 10 16), Uman, I.(Ludwig-Maximilians-Universität München, Department für Physik, 80799 Munich, Germany 10 16 16 Supported by the DFG cluster of excellence ‘Origin and Structure of the Universe’ ( www.universe-cluster.de ).), Vandenbroucke, M.(CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France 17), Virius, M.(Czech Technical University in Prague, 16636 Prague, Czech Republic 11), Vondra, J.(Czech Technical University in Prague, 16636 Prague, Czech Republic 11), Wang, L.(Universität Bochum, Institut für Experimentalphysik, 44780 Bochum, Germany 10 17 17 Supported by EU FP7 (HadronPhysics3, Grant Agreement number 283286).), Weisrock, T.(Universität Mainz, Institut für Kernphysik, 55099 Mainz, Germany 10), Wilfert, M.(Universität Mainz, Institut für Kernphysik, 55099 Mainz, Germany 10), Windmolders, R.(Universität Bonn, Physikalisches Institut, 53115 Bonn, Germany 10), Wiślicki, W.(National Centre for Nuclear Research, 00-681 Warsaw, Poland 19 19 Supported by the Polish NCN Grant DEC-2011/01/M/ST2/02350.), Wollny, H.(CEA IRFU/SPhN Saclay, 91191 Gif-sur-Yvette, France 17), Zaremba, K.(Warsaw University of Technology, Institute of Radioelectronics, 00-665 Warsaw, Poland 19), Zavertyaev, M.(Lebedev Physical Institute, 119991 Moscow, Russia), Zemlyanichkina, E.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), Zhuravlev, N.(Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia 13 13 Supported by CERN-RFBR Grants 08-02-91009 and 12-02-91500.), and Ziembicki, M.(Warsaw University of Technology, Institute of Radioelectronics, 00-665 Warsaw, Poland 19)
Subjects: GENERALIZED PARTON DISTRIBUTIONS, SCATTERING, ddc:530, High Energy Physics::Experiment, VECTOR-MESON ELECTROPRODUCTION, QCD, Nuclear Experiment, Particle Physics - Experiment, High Energy Physics - Experiment
Abstract: Exclusive production of $\rho^0$ 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 as a function of $Q^2$, $x_{Bj}$, or $p_{T}^{2}$. The $\sin \phi_S$ asymmetry is found to be $-0.019 \pm 0.008(stat.) \pm 0.003(syst.)$. All other asymmetries are also found to be of small magnitude and consistent with zero within experimental uncertainties. Very recent calculations using a GPD-based model agree well with the present results. The data is interpreted as evidence for the existence of chiral-odd, transverse generalized parton distributions., Comment: 14 pages, two tables, 5 figures, bibliography updated
Published: 2013

40. Hadron transverse momentum distributions in muon deep inelastic scattering at 160 GeV/c

Author: Adolph, C., Alekseev, M. G., Alexakhin, V. Yu., Alexandrov, Yu., Alexeev, G. D., Amoroso, A., Andrieux, V., Austregesilo, A., Badelek, B., Balestra, F., Barth, J., Baum, G., Bedfer, Y., Berlin, A., Bernhard, J., Bertini, R., Bicker, K., Bieling, J., Birsa, R., Bisplinghoff, J., Boer, M., Bordalo, P., Bradamante, F., Braun, C., Bravar, A., Bressan, A., Buechele, M., Burtin, E., Capozza, L., Chiosso, M., Chung, S. U., Cicuttin, A., Crespo, M. L., Torre, S. Dalla, Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Donskov, S. V., Doshita, N., Duic, V., Duennweber, W., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Filin, A., Finger, M., Finger jr., M., Fischer, H., Franco, C., von Hohenesche, N. du Fresne, Friedrich, J. M., Frolov, V., Garfagnini, R., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Geyer, R., Giorgi, M., Gnesi, I., Gobbo, B., Goertz, S., Grabmueller, S., Grasso, A., Grube, B., Gushterski, R., Guskov, A., Guthoerl, T., Haas, F., von Harrach, D., Heinsius, F. H., Herrmann, F., Hess, C., Hinterberger, F., Hoeppner, Ch., Horikawa, N., d'Hose, N., Huber, S., Ishimoto, S., Ivanshin, Yu., Iwata, T., Jahn, R., Jary, V., Jasinski, P., Joosten, R., Kabuss, E., Kang, D., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O., Kraemer, M., Kroumchtein, Z. V., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levorato, S., Lichtenstadt, J., Maggiora, A., Magnon, A., Makke, N., Mallot, G. K., Mann, A., Marchand, C., Martin, A., Marzec, J., Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Yu. V., Miyachi, Y., Morreale, A., Nagaytsev, A., Nagel, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Novy, J., Nowak, W. -D., Nunes, A. S., Olshevsky, A. G., Ostrick, M., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Piragino, G., Platchkov, S., Pochodzalla, J., Polak, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Rajotte, J. -F., Ramos, S., Reicherz, G., Rocco, E., Rodionov, V., Rondio, E., Rossiyskaya, N. S., Ryabchikov, D. I., Samoylenko, V. D., Sandacz, A., Sapozhnikov, M. G., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, P., Schill, C., Schlueter, T., Schmidt, A., Schmidt, K., Schmitt, L., Schmieden, H., Schoenning, K., Schopferer, S., Schott, M., Shevchenko, O. Yu., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sosio, S., Sozzi, F., Srnka, A., Steiger, L., Stolarski, M., Sulc, M., Sulej, R., Suzuki, H., Sznajder, P., Takekawa, S., Ter Wolbeek, J., Tessaro, S., Tessarotto, F., Thibaud, F., Uhl, S., Uman, I., Vandenbroucke, M., Virius, M., Wang, L., Weisrock, T., Wilfert, M., Windmolders, R., Wiślicki, W., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Zhuravlev, N., Ziembicki, M., C., Adolph, M. G., Alekseev, Alexakhin, V. Y. u., Alexandrov, Y. u., G. D., Alexeev, A., Amoroso, V., Andrieux, A., Austregesilo, B., Badełek, F., Balestra, J., Barth, G., Baum, Y., Bedfer, A., Berlin, J., Bernhard, R., Bertini, K., Bicker, J., Bieling, R., Birsa, J., Bisplinghoff, M., Boer, P., Bordalo, Bradamante, Franco, C., Braun, A., Bravar, Bressan, Andrea, M., Büchele, E., Burtin, L., Capozza, M., Chiosso, S. U., Chung, A., Cicuttin, M. L., Crespo, S., Dalla torre, S. S., Dasgupta, S., Dasgupta, Denisov, O. Y. u., S. V., Donskov, N., Doshita, Duic, Venicio, W., Dünnweber, M., Dziewiecki, A., Efremov, Elia, Carmine, P. D., Eversheim, W., Eyrich, M., Faessler, A., Ferrero, A., Filin, M., Finger, H., Fischer, C., Franco, N., Du fresne von hohenesche, J. M., Friedrich, V., Frolov, R., Garfagnini, F., Gautheron, O. P., Gavrichtchouk, S., Gerassimov, R., Geyer, M., Giorgi, I., Gnesi, B., Gobbo, S., Goertz, S., Grabmüller, A., Grasso, B., Grube, R., Gushterski, A., Guskov, T., Guthörl, F., Haa, D., Harrach, F. H., Heinsiu, F., Herrmann, C., Heß, F., Hinterberger, Höppner, C. h., N., Horikawa, N., D’Hose, S., Huber, S., Ishimoto, Ivanshin, Y. u., T., Iwata, R., Jahn, V., Jary, P., Jasinski, R., Joosten, E., Kabuß, D., Kang, B., Ketzer, G. V., Khaustov, Khokhlov, Y. u. A., Kisselev, Y. u., F., Klein, K., Klimaszewski, J. H., Koivuniemi, V. N., Kolosov, K., Kondo, K., Königsmann, I., Konorov, V. F., Konstantinov, A. M., Kotzinian, O., Kouznetsov, M., Krämer, Z. V., Kroumchtein, N., Kuchinski, F., Kunne, K., Kurek, R. P., Kurjata, A. A., Lednev, A., Lehmann, S., Levorato, J., Lichtenstadt, A., Maggiora, A., Magnon, Makke, Nour, G. K., Mallot, A., Mann, C., Marchand, Martin, Anna, J., Marzec, H., Matsuda, T., Matsuda, G., Meshcheryakov, W., Meyer, T., Michigami, Mikhailov, Y. u. V., A., Morreale, A., Nagaytsev, T., Nagel, F., Nerling, S., Neubert, D., Neyret, V. I., Nikolaenko, J., Novy, W. D., Nowak, A. S., Nune, A. G., Olshevsky, M., Ostrick, R., Panknin, D., Panzieri, B., Parsamyan, S., Paul, G., Piragino, S., Platchkov, J., Pochodzalla, J., Polak, V. A., Polyakov, J., Pretz, M., Quaresma, C., Quintan, J. F., Rajotte, S., Ramo, G., Reicherz, E., Rocco, V., Rodionov, E., Rondio, N. S., Rossiyskaya, D. I., Ryabchikov, V. D., Samoylenko, A., Sandacz, M. G., Sapozhnikov, S., Sarkar, I. A., Savin, Sbrizzai, Giulio, Schiavon, Paolo, C., Schill, T., Schlüter, A., Schmidt, K., Schmidt, L., Schmitt, H., Schmïden, K., Schönning, S., Schopferer, M., Schott, Shevchenko, O. Y. u., L., Silva, L., Sinha, S., Sirtl, M., Slunecka, S., Sosio, Sozzi, Federica, A., Srnka, L., Steiger, M., Stolarski, M., Sulc, R., Sulej, H., Suzuki, P., Sznajder, S., Takekawa, J., Ter wolbeek, Tessaro, Susanna, F., Tessarotto, F., Thibaud, S., Uhl, I., Uman, M., Vandenbroucke, M., Viriu, L., Wang, T., Weisrock, M., Wilfert, R., Windmolder, W., Wiślicki, H., Wollny, K., Zaremba, M., Zavertyaev, E., Zemlyanichkina, N., Zhuravlev, and M., Ziembicki
Subjects: SIDIS, TMD, Particle physics, Physics and Astronomy (miscellaneous), Hadron, FOS: Physical sciences, Parton, COMPASS, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, NUCLEON, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous), Quantum chromodynamics, Physics, Muon, 010308 nuclear & particles physics, Scattering, High Energy Physics::Phenomenology, Order (ring theory), Deep inelastic scattering, Exponential function, High Energy Physics - Phenomenology, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract: Multiplicities of charged hadrons produced in deep inelastic muon scattering off a $^6$LiD target have been measured as a function of the DIS variables $x_{Bj}$, $Q^2$, $W^2$ and the final state hadron variables $p_T$ and $z$. The $p_T^2$ distributions are fitted with a single exponential function at low values of $p_T^2$ to determine the dependence of $\langle p_T^2 \rangle$ on $x_{Bj}$, $Q^2$, $W^2$ and $z$. The $z$-dependence of $\langle p_T^2 \rangle$ is shown to be a potential tool to extract the average intrinsic transverse momentum squared of partons, $\langle k_{\perp}^2 \rangle$, as a function of $x_{Bj}$ and $Q^2$ in a leading order QCD parton model., 18 pages, 13 figures and 3 tables
Published: 2013

41. Leading order determination of the gluon polarisation from DIS events with high-p(T) hadron pairs

Author: Adolph, C., Alekseev, M. G., Alexakhin, V. Yu., Alexandrov, Yu., Alexeev, G. D., Amoroso, A., Antonov, A. A., Austregesilo, A., Badelek, B., Balestra, F., Barth, J., Baum, G., Bedfer, Y., Bernhard, J., Bertini, R., Bettinelli, M., Bicker, K., Bieling, J., Birsa, R., Bisplinghoff, J., Bordalo, P., Bradamante, F., Braun, C., Bravar, A., Bressan, A., Burtin, E., Chaberny, D., Chiosso, M., Chung, S. U., Cicuttin, A., Crespo, M. L., Torre, S. Dalla, Das, S., Dasgupta, S. S., Denisov, O. Yu., Dhara, L., Donskov, S. V., Doshita, N., Duic, V., Duennweber, W., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Filin, A., Finger, M., Finger jr., M., Fischer, H., Franco, C., von Hohenesche, N. du Fresne, Friedrich, J. M., Garfagnini, R., Gautheron, F., Gavrichtchouk, O. P., Gazda, R., Gerassimov, S., Geyer, R., Giorgi, M., Gnesi, I., Gobbo, B., Goertz, S., Grabmueller, S., Grasso, A., Grube, B., Gushterski, R., Guskov, A., Guthoerl, T., Haas, F., von Harrach, D., Hedicke, S., Heinsius, F. H., Herrmann, F., Hess, C., Hinterberger, F., Horikawa, N., Hoeppner, Ch., d'Hose, N., Huber, S., Ishimoto, S., Ivanov, O., Ivanshin, Yu., Iwata, T., Jahn, R., Jasinski, P., Joosten, R., Kabuss, E., Kang, D., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Klimaszewski, K., Koblitz, S., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Korzenev, A., Kotzinian, A. M., Kouznetsov, O., Kraemer, M., Kroumchtein, Z. V., Kunne, F., Kurek, K., Lauser, L., Goff, J. -M. Le, Lednev, A. A., Lehmann, A., Levorato, S., Lichtenstadt, J., Maggiora, A., Magnon, A., Makke, N., Mallot, G. K., Mann, A., Marchand, C., Martin, A., Marzec, J., Matsuda, T., Meyer, W., Michigami, T., Mikhailov, Yu. V., Moinester, M. A., Morreale, A., Mutter, A., Nagaytsev, A., Nagel, T., Nassalski, J. P., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Nowak, W. D., Nunes, A. S., Olshevsky, A. G., Ostrick, M., Padee, A., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Perevalova, E., Pesaro, G., Peshekhonov, D. V., Piragino, G., Platchkov, S., Pochodzalla, J., Polak, J., Polyakov, V. A., Pontecorvo, G., Procureur, S. L., Pretz, J., Quaresma, M., Quintans, C., Rajotte, J. -F., Ramos, S., Rapatsky, V., Reicherz, G., Richter, A., Rocco, E., Rondio, E., Rossiyskaya, N. S., Ryabchikov, D. I., Samoylenko, V. D., Sandacz, A., Sapozhnikov, M. G., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, P., Schill, C., Schlueter, T., Schmidt, K., Schmitt, L., Schoenning, K., Schopferer, S., Schott, M., Shevchenko, O. Yu., Silva, L., Sinha, L., Sissakian, A. N., Slunecka, M., Smirnov, G. I., Sosio, S., Sozzi, F., Srnka, A., Stolarski, M., Sulc, M., Sulej, R., Sznajder, P., Takekawa, S., Ter Wolbeek, J., Tessaro, S., Tessarotto, F., Tkatchev, L. G., Uhl, S., Uman, I., Vandenbroucke, M., Virius, M., Vlassov, N. V., Wang, L., Windmolders, R., Wislicki, W., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., Zhuravlev, N., Zvyagin, A., Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Laboratoire de Physique des Composants à Semiconducteurs (LPCS), École Nationale Supérieure d'Électronique et de Radioélectricité de Grenoble (ENSERG)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Luminescent Materials Laboratory, Department of Biotechnology, University of Verona, Department of Mathematics [Philadelphia], University of Pennsylvania [Philadelphia], National Taiwan University [Taiwan] (NTU), Abdus Salam International Centre for Theoretical Physics [Trieste] (ICTP), Laboratoire d'informatique Fondamentale de Marseille (LIF), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Department of Zoology, Visva-Bharati University, Université Antonine, Université Antonine, Faculté d'ingénieurs, Institute for Meteorology and Climate Research (IMK), Karlsruhe Institute of Technology (KIT), Institut des Sciences cognitives Marc Jeannerod - Laboratoire sur le langage, le cerveau et la cognition (L2C2), École normale supérieure - Lyon (ENS Lyon)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Archeobotanica e Paleoecologia, Università del Salento [Lecce], Physikalisches Institut [Freiburg], Albert-Ludwigs-Universität Freiburg, Institut für Ionenphysik und Angewandte Physik - Institute for Ion Physics and Applied Physics [Innsbruck], Leopold Franzens Universität Innsbruck - University of Innsbruck, Department of Environmental and Materials Engineering, Nagoya Institute, Institute for Computing and Information Sciences [Nijmegen] (ICIS), Radboud university [Nijmegen], Laboratory of Molecular Immunology, Rockefeller University [New York], University of Manchester [Manchester], Université de Caen Normandie (UNICAEN), Normandie Université (NU), Department of Otolaryngology - Head and Neck Surgery, Department of Medecine [Montréal], McGill University = Université McGill [Montréal, Canada]-McGill University = Université McGill [Montréal, Canada], Centre for Research on Brain, Language and Music, International Laboratory for Brain, Music and Sound Research (BRAMS), Princeton University, aucun, Symadrem, Analyse, Géométrie et Modélisation (AGM - UMR 8088), Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), Franco-czech Laboratory for clinical research on obesity, Charles University [Prague] (CU)-Institut National de la Santé et de la Recherche Médicale (INSERM), Institut de Chimie des Substances Naturelles (ICSN), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institute of Environmental Physics [Bremen] (IUP), University of Bremen, University of Cambridge [UK] (CAM), National School of Mountain Sports/National Ski-Nordic Centre, Institut des Biomolécules Max Mousseron [Pôle Chimie Balard] (IBMM), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM), Departamento de Matemática e Aplicações (DMA), Universidade do Minho, Imagerie et modélisation Vasculaires, Thoraciques et Cérébrales (MOTIVATE), Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé (CREATIS), Université Jean Monnet [Saint-Étienne] (UJM)-Hospices Civils de Lyon (HCL)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Jean Monnet [Saint-Étienne] (UJM)-Hospices Civils de Lyon (HCL)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM), COMPASS, Università degli studi di Verona = University of Verona (UNIVR), University of Pennsylvania, Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Université Antonine (UA), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Radboud University [Nijmegen], Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Universidade do Minho = University of Minho [Braga], Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)
Subjects: [PHYS]Physics [physics], High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Particle Physics - Experiment, High Energy Physics - Experiment
Abstract: We present a determination of the gluon polarisation Delta g/g in the nucleon, based on the longitudinal double-spin asymmetry of DIS events with a pair of large transverse-momentum hadrons in the final state. The data were obtained by the COMPASS experiment at CERN using a 160 GeV/c polarised muon beam scattering off a polarised ^6LiD target. The gluon polarisation is evaluated by a Neural Network approach for three intervals of the gluon momentum fraction x_g covering the range 0.04 < x_g < 0.27. The values obtained at leading order in QCD do not show any significant dependence on x_g. Their average is Delta g/g = 0.125 +/- 0.060 (stat.) +/- 0.063 (syst.) at x_g=0.09 and a scale of mu^2 = 3 (GeV/c)^2., 13 pages, 6 figures and 3 tables
Published: 2013

42. Study of ��(1385) and ��(1321) hyperon and antihyperon production in deep inelastic muon scattering

Author: Adolph, C., Alekseev, M., Alexakhin, V. Yu., Alexandrov, Yu., Alexeev, G. D., Amoroso, A., Austregesilo, A., Badelek, B., Balestra, F., Barth, J., Baum, G., Bedfer, Y., Berlin, A., Bernhard, J., Bertini, R., Bicker, K., Bieling, J., Birsa, R., Bisplinghoff, J., Bordalo, P., Bradamante, F., Braun, C., Bravar, A., Bressan, A., Buechele, M., Burtin, E., Capozza, L., Chiosso, M., Chung, S. U., Cicuttin, A., Crespo, M. L., Torre, S. Dalla, Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Donskov, S. V., Doshita, N., Duic, V., Duennweber, W., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Filin, A., Finger, M., Fischer, H., Franco, C., von Hohenesche, N. du Fresne, Friedrich, J. M., Frolov, V., Garfagnini, R., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Geyer, R., Giorgi, M., Gnesi, I., Gobbo, B., Goertz, S., Grabmueller, S., Grasso, A., Grube, B., Gushterski, R., Guskov, A., Guthoerl, T., Haas, F., von Harrach, D., Heinsius, F. H., Herrmann, F., Hess, C., Hinterberger, F., Hoeppner, Ch., Horikawa, N., d'Hose, N., Huber, S., Ishimoto, S., Ivanshin, Yu., Iwata, T., Jahn, R., Jary, V., Jasinski, P., Joosten, R., Kabuss, E., Kang, D., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O., Kraemer, M., Kroumchtein, Z. V., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levorato, S., Lichtenstadt, J., Maggiora, A., Magnon, A., Makke, N., Mallot, G. K., Mann, A., Marchand, C., Martin, A., Marzec, J., Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Yu. V., Miyachi, Y., Morreale, A., Nagaytsev, A., Nagel, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Novy, J., Nowak, W. -D., Nunes, A. S., Olshevsky, A. G., Ostrick, M., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Piragino, G., Platchkov, S., Pochodzalla, J., Polak, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Reicherz, G., Rocco, E., Rodionov, V., Rondio, E., Rossiyskaya, N. S., Ryabchikov, D. I., Samoylenko, V. D., Sandacz, A., Sapozhnikov, M. G., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, P., Schill, C., Schlueter, T., Schmidt, A., Schmidt, K., Schmitt, L., Schmieden, H., Schoenning, K., Schopferer, S., Schott, M., Shevchenko, O. Yu., Silva, L., Sinha, L., Sirtl, S., Sosio, S., Sozzi, F., Srnka, A., Steiger, L., Stolarski, M., Sulc, M., Sulej, R., Suzuki, H., Sznajder, P., Takekawa, S., Ter Wolbeek, J., Tessaro, S., Tessarotto, F., Thibaud, F., Uhl, S., Uman, I., Vandenbroucke, M., Virius, M., Wang, L., Weisrock, T., Wilfert, M., Windmolders, R., Wislicki, W., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Zhuravlev, N., and Ziembicki, M.
Subjects: High Energy Physics - Experiment (hep-ex), Nuclear Theory, High Energy Physics::Phenomenology, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract: Large samples of ��, ��(1385) and ��(1321) hyperons produced in deep-inelastic muon scattering off a ^6LiD target were collected with the COMPASS experimental setup at CERN. The relative yields of ��(1385)^+, ��(1385)^-, \bar��(1385)^-, \bar��(1385)^+, ��(1321)^-, and \bar��(1321)^+ hyperons decaying into ��(\bar��)��were measured. The heavy hyperon to ��and heavy antihyperon to \bar�� yield ratios were found to be in the range 3.8% to 5.6% with a relative uncertainty of about 10%. They were used to tune the parameters relevant for strange particle production of the LEPTO Monte Carlo generator., 13 pages, 4 figures and 3 tables, 1 Appendix with 3 figures. Version accepted by the Editor
Published: 2013
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43. Transverse target spin asymmetries in exclusive $��^0$ muoproduction

Author: Adolph, C., Alekseev, M. G., Alexakhin, V. Yu., Alexandrov, Yu., Alexeev, G. D., Amoroso, A., Andrieux, V., Austregesilo, A., Badellek, B., Balestra, F., Barth, J., Baum, G., Bedfer, Y., Berlin, A., Bernhard, J., Bertini, R., Bicker, K., Bieling, J., Birsa, R., Bisplinghoff, J., Boer, M., Bordalo, P., Bradamante, F., Braun, C., Bravar, A., Bressan, A., Buechele, M., Burtin, E., Capozza, L., Chiosso, M., Chung, S. U., Cicuttin, A., Crespo, M. L., Torre, S. Dalla, Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Donskov, S. V., Doshita, N., Duic, V., Duennweber, W., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Filin, A., Finger, M., Fischer, H., Franco, C., von Hohenesche, N. du Fresne, Friedrich, J. M., Frolov, V., Garfagnini, R., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Geyer, R., Giorgi, M., Gnesi, I., Gobbo, B., Goertz, S., Grabmueller, S., Grasso, A., Grube, B., Gushterski, R., Guskov, A., Guthoerl, T., Haas, F., von Harrach, D., Hahne, D., Heinsius, F. H., Herrmann, F., Hess, C., Hinterberger, F., Hoeppner, Ch., Horikawa, N., d'Hose, N., Huber, S., Ishimoto, S., Ivanshin, Yu., Iwata, T., Jahn, R., Jary, V., Jasinski, P., Joosten, R., Kabuss, E., Kang, D., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Klimaszewski, K., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Koenigsmann, K., Konorov, I., Konstantinov, V. F., Kotzinian, A. M., Kouznetsov, O., Kraemer, M., Kroumchtein, Z. V., Kuchinski, N., Kunne, F., Kurek, K., Kurjata, R. P., Lednev, A. A., Lehmann, A., Levorato, S., Lichtenstadt, J., Maggiora, A., Magnon, A., Makke, N., Mallot, G. K., Marchand, C., Martin, A., Marzec, J., Matousek, J., Matsuda, H., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Yu. V., Miyachi, Y., Morreale, A., Nagaytsev, A., Nagel, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Novy, J., Nowak, W. -D., Nunes, A. S., Olshevsky, A. G., Ostrick, M., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Pesek, M., Piragino, G., Platchkov, S., Pochodzalla, J., Polak, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Ramos, S., Reicherz, G., Rocco, E., Rodionov, V., Rondio, E., Rossiyskaya, N. S., Ryabchikov, D. I., Samoylenko, V. D., Sandacz, A., Sapozhnikov, M. G., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, P., Schill, C., Schlueter, T., Schmidt, A., Schmidt, K., Schmitt, L., Schmieden, H., Schoenning, K., Schopferer, S., Schott, M., Shevchenko, O. Yu., Silva, L., Sinha, L., Sirtl, S., Slunecka, M., Sosio, S., Sozzi, F., Srnka, A., Steiger, L., Stolarski, M., Sulc, M., Sulej, R., Suzuki, H., Sznajder, P., Takekawa, S., Ter Wolbeek, J., Tessaro, S., Tessarotto, F., Thibaud, F., Uhl, S., Uman, I., Vandenbroucke, M., Virius, M., Vondra, J., Wang, L., Weisrock, T., Wilfert, M., Windmolders, R., Wislicki, W., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Zhuravlev, N., and Ziembicki, M.
Subjects: High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract: Exclusive production of $��^0$ 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 as a function of $Q^2$, $x_{Bj}$, or $p_{T}^{2}$. The $\sin ��_S$ asymmetry is found to be $-0.019 \pm 0.008(stat.) \pm 0.003(syst.)$. All other asymmetries are also found to be of small magnitude and consistent with zero within experimental uncertainties. Very recent calculations using a GPD-based model agree well with the present results. The data is interpreted as evidence for the existence of chiral-odd, transverse generalized parton distributions., 14 pages, two tables, 5 figures, bibliography updated
Published: 2013
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44. Leading and next-to-leading order gluon polarization in the nucleon and longitudinal double spin asymmetries from open charm muoproduction

Author: Adolph, C., Bedfer, Y., Burtin, E., Capozza, L., Ferrero, A., D'Hose, N., Kunne, F., Magnon, A., Makke, N, Marchand, C., Morreale, A., Neyret, D., Platchkov, S., Vandenbroucke, M., Wollny, H., Korzenev, A., COMPASS, Collaboration, Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and COMPASS
Subjects: Nuclear Theory, High Energy Physics::Phenomenology, High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: International audience; The gluon polarization in the nucleon was measured using open charm production by scattering 160 GeV/c polarized muons off longitudinally polarized protons or deuterons. The data were taken by the COMPASS Collaboration between 2002 and 2007. A detailed account is given of the analysis method that includes the application of neural networks. Several decay channels of D-0 mesons are investigated. Longitudinal spin asymmetries of the D meson production cross sections are extracted in bins of D-0 transverse momentum and energy. At leading order QCD accuracy, the average gluon polarization is determined as Delta g/g (LO) = -0.06 +/- 0: 21(stat.) +/- 0. 08(syst.) at the scale mu(2) approximate to 13 (GeV/c)(2) and an average gluon momentum fraction x approximate to 0.11. The average gluon polarization is also obtained at next-to-leading order QCD accuracy as Delta g/g NLO = -0.13 +/- 0.15(stat.).+/- 0.15(syst.) at the scale mu(2) approximate to 13 (GeV/c)(2) and x approximate to 0.20.
Published: 2013

45. Study of Sigma(1385) and Xi(1321) hyperon and antihyperon production in deep inelastic muon scattering

Author: Adolph, C., Bedfer, Y., Burtin, E., Capozza, L., Ferrero, A., d'Hose, N., Kunne, F., Magnon, A., Makke, N, Marchand, C., Morreale, A., Neyret, D., Platchkov, S., Thibaud, F., Vandenbroucke, M., Wollny, H., Compass, Collaboration, Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and COMPASS
Subjects: High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: International audience; Large samples of Lambda, Sigma(1385) and Xi(1321) hyperons produced in the deep-inelastic muon scattering off a (LiD)-Li-6 target were collected with the COMPASS experimental setup at CERN. The relative yields of Sigma(1385)(+), Sigma(1385)(-), Sigma(1385)(-), Sigma(1385)(+), Xi(1321)(-), and Xi(1321)(+) hyperons decaying into Lambda(Lambda)pi were measured. The ratios of heavy-hyperon to Lambda and heavy-antihyperon to Lambda were found to be in the range 3.8 % to 5.6 % with a relative uncertainty of about 10 %. They were used to tune the parameters relevant for strange particle production of the LEPTO Monte Carlo generator.
Published: 2013

46. Hadron transverse momentum distributions in muon deep inelastic scattering at 160 GeV/c

Author: Adolph, C., Andrieux, V., Bedfer, Y., Boer, M, Burtin, E., Capozza, L., Ferrero, A., D'Hose, N., Kunne, F., Magnon, A., Makke, N, Marchand, C., Morreale, A., Neyret, D., Platchkov, S., Thibaud, F., Vandenbroucke, M., Wollny, H., COMPASS, Collaboration, Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and COMPASS
Subjects: High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract: International audience; Multiplicities of charged hadrons produced in deep inelastic muon scattering off a (LiD)-Li-6 target have been measured as a function of the DIS variables x(Bj), Q(2), W-2 and the final state hadron variables p(T) and z. The p(T)(2) distributions are fitted with a single exponential function at low values of p(T)(2) to determine the dependence of < p(T)(2)> on x(Bj), Q(2), W-2 and z. The z-dependence of < p(T)(2)> is shown to be a potential tool to extract the average intrinsic transverse momentum squared of partons, < k(perpendicular to)(2)>, as a function of x(Bj) and Q(2) in a leading order QCD parton model.
Published: 2013

47. Long term experience and performance of COMPASS RICH-1

Author: Tessarotto, F., Abbon, P., Alexeev, M., Birsa, R., Bordalo, P., Bradamante, F., Bressan, A., Büchele, M., Chiosso, M., Ciliberti, P., Dafni, T., Torre, S. Dalla, Dasgupta, S., Delagnes, E., Denisov, O., Duic, V., Ferrero, A., Finger, M., Fischer, H., Franco, C., Gerassimov, S., Gobbo, B., Gregori, M., Herrmann, F., Ketzer, B., Königsmann, K., Konorov, I., Kunne, F., Levorato, S., Maggiora, A., Makke, N., Martin, A., Menon, G., Neyret, D., Novakova, K., Panzieri, D., Paul, S., Pereira, F. A., Polak, J., Rocco, E., Santos, C. A., Sbrizzai, G., Schiavon, P., Schopferer, S., Slunecka, M., Sozzi, F., Steiger, L., Sulc, M., Takekawa, S., Sub Subatomic Physics (SAP), Subatomic Physics, Département d'Electronique, des Détecteurs et d'Informatique pour la Physique (ex SEDI) (DEDIP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Département de Physique Nucléaire (ex SPhN) (DPHN), Physikalisches Institut [Freiburg], Albert-Ludwigs-Universität Freiburg, COMPASS, Sub Subatomic Physics (SAP), Subatomic Physics, Tessarotto, F, Abbon, P, Alexeev, M, Birsa, R, Bordalo, P, Bradamante, Franco, Bressan, Andrea, Büchele, M, Chiosso, M, Ciliberti, Piero, Dafni, T, Torre, S. Dalla, Dasgupta, SHUDDHA SHANKAR, Delagnes, E, Denisov, O, Duic, Venicio, Ferrero, A, Finger, M, M. Finger Jr, M. Finger Jr, Fischer, H, Franco, C, Gerassimov, S, Gobbo, B, Gregori, M, Herrmann, F, Ketzer, B, Königsmann, K, Konorov, I, Kunne, F, Levorato, Stefano, Maggiora, A, Makke, Nour, Martin, Anna, Menon, G, Neyret, D, Novakova, K, Panzieri, D, Paul, S, Pereira, F. A, Polak, J, Rocco, E, Santos, C. A, Sbrizzai, G, Schiavon, Paolo, Schopferer, S, Slunecka, M, Sozzi, Federica, Steiger, Luka, Sulc, M, and Takekawa, Stefano
Subjects: Physics::Instrumentation and Detectors, Cherenkov detector, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Particle detector, law.invention, Particle identification methods, Photon detectors for UV, visible and IR photons (vacuum), Optics, law, Compass, Carbon–fluorine bond, COMPASS experiment, visible and IR photons (gas), Photon detectors for UV, Instrumentation, Mathematical Physics, Physics, Large Hadron Collider, Spectrometer, business.industry, Cherenkov detectors, Photon detectors for UV, visible and IR photons (gas), Photon detectors for UV visible and IR photons (gas), visible and IR photons (vacuum), Upgrade, Physics::Accelerator Physics, Optoelectronics, High Energy Physics::Experiment, Photon detectors for UV visible and IR photons (vacuum), Particle identification methods, Cherenkov detectors, Photon detectors for UV visible and IR photons (gas), Photon detectors for UV visible and IR photons (vacuum), business
Abstract: International audience; COMPASS RICH-1 is a large size gaseous Imaging Cherenkov Detector providinghadron identification in the range from 3 to 55 GeV/c, in the wide acceptance spectrometer of theCOMPASS Experiment at CERN SPS.It uses a 3m long C4F10 radiator, a 21m2 large VUV mirror surface and two kinds of photondetectors: MAPMTs and MWPCs with CsI photocathodes, covering a total of 5.5m2. It is inoperation since 2002 and its performance increased thanks to progressive optimization and to amajor upgrade of its photon detection system, implemented in 2006; a new upgrade is foreseen for2016, with the use of MPGD-based photon detectors.The main characteristics of COMPASS RICH-1 components are described and the most criticalaspects related to the C4F10 radiator gas system, to the mirrors and their alignment, as well asthe performance of the photon detectors are presented and discussed. The response of the MWPCsand the observed evolution of the effective quantum efficiency of the CsI photocathodes is analyzed.The properties and performance of the MAPMTs with individual fused lens telescopes arepresented together with the readout characteristics. The PID performance of COMPASS RICH-1is discussed and the future upgrade program is mentioned.
Published: 2014

48. Exclusive rho^0 muoproduction on transversely polarised protons and deuterons

Author: Adolph, C., Alekseev, M. G., Alexakhin, V. Yu., Alexandrov, Yu., Alexeev, G. D., Amoroso, A., Antonov, A. A., Austregesilo, A., Badełek, B., Balestra, F., Barth, J., Baum, G., Bedfer, Y., Bernhard, J., Bertini, R., Bettinelli, M., Bicker, K., Bieling, J., Birsa, R., Bisplinghoff, J., Bordalo, P., Bradamante, F., Braun, C., Bravar, A., Bressan, A., Büchele, M., Burtin, E., Capozza, L., Chiosso, M., Chung, S. U., Cicuttin, A., Crespo, M. L., Torre, S. Dalla, Das, S., Dasgupta, S. S., Dasgupta, S., Denisov, O. Yu., Dhara, L., Donskov, S. V., Doshita, N., Duic, V., Dünnweber, W., Dziewiecki, M., Efremov, A., Elia, C., Eversheim, P. D., Eyrich, W., Faessler, M., Ferrero, A., Filin, A., Finger, M., Finger Jr, M., Fischer, H., Franco, C., von Hohenesche, N. du Fresne, Friedrich, J. M., Frolov, V., Garfagnini, R., Gautheron, F., Gavrichtchouk, O. P., Gerassimov, S., Geyer, R., Giorgi, M., Gnesi, I., Gobbo, B., Goertz, S., Grabmüller, S., Grasso, A., Grube, B., Gushterski, R., Guskov, A., Guthörl, T., Haas, F., von Harrach, D., Heinsius, F. H., Herrmann, F., Heß, C., Hinterberger, F., Horikawa, N., Höppner, Ch., d'Hose, N., Ishimoto, S., Ivanov, O., Ivanshin, Yu., Iwata, T., Jahn, R., Jary, V., Jasinski, P., Jegou, G., Joosten, R., Kabuß, E., Kang, D., Ketzer, B., Khaustov, G. V., Khokhlov, Yu. A., Kisselev, Yu., Klein, F., Klimaszewski, K., Koblitz, S., Koivuniemi, J. H., Kolosov, V. N., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V. F., Korzenev, A., Kotzinian, A. M., Kouznetsov, O., Krämer, M., Kroumchtein, Z. V., Kunne, F., Kurek, K., Lauser, L., Lednev, A. A., Lehmann, A., Levorato, S., Lichtenstadt, J., Liska, T., Maggiora, A., Magnon, A., Makke, N., Mallot, G. K., Mann, A., Marchand, C., Martin, A., Marzec, J., Matsuda, T., Meshcheryakov, G., Meyer, W., Michigami, T., Mikhailov, Yu. V., Moinester, M. A., Morreale, A., Mutter, A., Nagaytsev, A., Nagel, T., Negrini, T., Nerling, F., Neubert, S., Neyret, D., Nikolaenko, V. I., Nowak, W. -D., Nunes, A. S., Olshevsky, A. G., Ostrick, M., Padee, A., Panknin, R., Panzieri, D., Parsamyan, B., Paul, S., Perevalova, E., Pesaro, G., Peshekhonov, D. V., Piragino, G., Platchkov, S., Pochodzalla, J., Polak, J., Polyakov, V. A., Pretz, J., Quaresma, M., Quintans, C., Rajotte, J. -F., Ramos, S., Rapatsky, V., Reicherz, G., Richter, A., Rocco, E., Rondio, E., Rossiyskaya, N. S., Ryabchikov, D. I., Samoylenko, V. D., Sandacz, A., Sapozhnikov, M. G., Sarkar, S., Savin, I. A., Sbrizzai, G., Schiavon, P., Schill, C., Schlüter, T., Schmidt, K., Schmitt, L., Schönning, K., Schopferer, S., Schott, M., Schröder, W., Shevchenko, O. Yu., Silva, L., Sinha, L., Sissakian, A. N., Slunecka, M., Smirnov, G. I., Sosio, S., Sozzi, F., Srnka, A., Steiger, L., Stolarski, M., Sulc, M., Sulej, R., Suzuki, H., Sznajder, P., Takekawa, S., Ter Wolbeek, J., Tessaro, S., Tessarotto, F., Tkatchev, L. G., Uhl, S., Uman, I., Vandenbroucke, M., Virius, M., Vlassov, N. V., Wang, L., Wilfert, M., Windmolders, R., Wiślicki, W., Wollny, H., Zaremba, K., Zavertyaev, M., Zemlyanichkina, E., Ziembicki, M., Zhuravlev, N., and Zvyagin, A.
Subjects: High Energy Physics - Experiment (hep-ex), POLARIZED TARGET, Nuclear Theory, FOS: Physical sciences, High Energy Physics::Experiment, COMPASS, polarized beam, Nuclear Experiment, Particle Physics - Experiment, High Energy Physics - Experiment
Abstract: The transverse target spin azimuthal asymmetry A_UT in hard exclusive production of rho^0 mesons was measured at COMPASS by scattering 160 GeV/c muons off transversely polarised protons and deuterons. The measured asymmetry is sensitive to the nucleon helicity-flip generalised parton distributions E^q, which are related to the orbital angular momentum of quarks in the nucleon. The Q^2, x_B and p_t^2 dependence of A_UT is presented in a wide kinematic range. Results for deuterons are obtained for the first time. The measured asymmetry is small in the whole kinematic range for both protons and deuterons, which is consistent with the theoretical interpretation that contributions from GPDs E^u and E^d approximately cancel., Comment: 20 pages, 9 figures and 4 tables, updated author list
Published: 2012

49. D* and D meson production in muon nucleon interactions at 160 GeV/c

Author: Adolph, C., Bedfer, Y., Burtin, E., Capozza, L., Ferrero, A., D'Hose, N., Korzenev, A., Kunne, F., Magnon, A., Makke, N, Marchand, C., Morreale, A., Neyret, D., Platchkov, S., Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and COMPASS
Subjects: High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: International audience; The production of D* and D mesons in inelastic scattering of 160 GeV/c muons off a (LiD)-Li-6 target has been investigated with the COMPASS spectrometer at CERN for 0.003 (GeV/c)(2) < Q(2) < 10 (GeV/c)(2) and 3 x 10(-5) < x(Bj) < 0.1. The study is based on 8100 events where a D-0 or (D) over bar (0) is detected subsequently to a D*(+) or D*(-) decay, and on 34000 events, where only a D-0 or (D) over bar (0) is detected. Kinematic distributions of D*, D and K-2* (1430) are given as a function of their energy E, transverse momentum p(T), energy fraction z, and of the virtual photon variables nu, Q(2) and x(Bj). Semi-inclusive differential D* production cross-sections are compared with theoretical predictions for D* production via photon-gluon fusion into open charm. The total observed production cross-section for D*(+/-) mesons with laboratory energies between 22 and 86 GeV is (1.9 +/- 0.4) nb. Significant cross-section asymmetries are observed between D*(+) and D*(-) production for nu < 40 GeV and z > 0.6.
Published: 2012

50. Transverse spin effects in hadron-pair production from semi-inclusive deep inelastic scattering

Author: Adolph, C., Bedfer, Y., Burtin, E., Ferrero, A., D'Hose, N., Korzenev, A., Kunne, F., Magnon, A., Marchand, C., Makke, N, Morreale, A., Neyret, D., Platchkov, S., Vandenbroucke, M., Wollny, H., COMPASS, Collaboration, Physikalisches Institut [Erlangen], Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and COMPASS
Subjects: High Energy Physics::Phenomenology, Nuclear Theory, High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: International audience; First measurements of azimuthal asymmetries in hadron-pair production in deep-inelastic scattering of muons on transversely polarised (LiD)-Li-6 (deuteron) and NH3 (proton) targets are presented. The data were taken in the years 2002-2004 and 2007 with the COMPASS spectrometer using a muon beam of 160 GeV/c at the CERN SPS. The asymmetries provide access to the transversity distribution functions, without involving the Collins effect as in single hadron production. The sizeable asymmetries measured on the NH3 target indicate non-vanishing u-quark transversity and two-hadron interference fragmentation functions. The small asymmetries measured on the (LiD)-Li-6 target can be interpreted as indication for a cancellation of u- and d-quark transversities.
Published: 2012

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