Exclusive production of ρ0ρ0 mesons was studied at the COMPASS experiment by scattering 160 GeV/c160 GeV/c muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured as a function of Q2Q2, xBjxBj, or View the MathML sourcepT2. The View the MathML sourcesinϕS asymmetry is found to be −0.019±0.008(stat.)±0.003(syst.)−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.
Transverse target spin asymmetries in exclusive $ ho^0$ muoproduction / Adolph, C.; Alekseev, M. G.; Alexakhin, V. Y. u.; Alexandrov, Y. u.; 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, Franco; Braun, C.; Bravar, A.; Bressan, Andrea; Buechele, M.; Burtin, E.; Capozza, L.; Chiosso, M.; Chung, S. U.; Cicuttin, A.; Crespo, M. L.; Dalla Torre, S.; Dasgupta, S. S.; Dasgupta, S.; Denisov, O. Y. u.; Donskov, S. V.; Doshita, N.; Duic, Venicio; Duennweber, W.; Dziewiecki, M.; Efremov, A.; Elia, Carmine; 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.; Garfagnini, R.; Gautheron, F.; Gavrichtchouk, O. P.; Gerassimov, S.; Geyer, R.; Giorgi, Marcello; 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, C. h.; Horikawa, N.; D'Hose, N.; Huber, S.; Ishimoto, S.; Ivanshin, Y. u.; Iwata, T.; Jahn, R.; Jary, V.; Jasinski, P.; Joosten, R.; Kabuss, E.; Kang, D.; Ketzer, B.; Khaustov, G. V.; Khokhlov, Y. u. A.; Kisselev, Y. u.; 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, 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.; 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, Elena; Rodionov, V.; Rondio, E.; Rossiyskaya, N. S.; Ryabchikov, D. I.; Samoylenko, V. D.; Sandacz, A.; Sapozhnikov, M. G.; Sarkar, S.; Savin, I. A.; Sbrizzai, Giulio; Schiavon, Paolo; Schill, C.; Schlueter, T.; Schmidt, A.; Schmidt, K.; Schmitt, L.; Schmieden, H.; Schoenning, 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.; Sznajder, P.; Takekawa, S.; Ter~wolbeek, J.; Tessaro, Susanna; 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.; Ziembicki, M.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 731/2014:(2014), pp. 19-26. [10.1016/j.physletb.2014.02.005]
Transverse target spin asymmetries in exclusive $ ho^0$ muoproduction
BRADAMANTE, FRANCO;BRESSAN, Andrea;S. Dalla Torre;DUIC, VENICIO;ELIA, CARMINE;GIORGI, MARCELLO;LEVORATO, STEFANO;Makke, Nour;MARTIN, ANNA;MATOUSEK, JAN;ROCCO, ELENA;SBRIZZAI, GIULIO;SCHIAVON, PAOLO;SOZZI, FEDERICA;TESSARO, SUSANNA;
2014-01-01
Abstract
Exclusive production of ρ0ρ0 mesons was studied at the COMPASS experiment by scattering 160 GeV/c160 GeV/c muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured as a function of Q2Q2, xBjxBj, or View the MathML sourcepT2. The View the MathML sourcesinϕS asymmetry is found to be −0.019±0.008(stat.)±0.003(syst.)−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.| File | Dimensione | Formato | |
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