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

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 i...

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Detalles Bibliográficos
Autores principales: 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, Büchele, 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 Yu, 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, M., Jr., 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, M, Gnesi, I, Gobbo, B, Goertz, S, Grabmüller, S, Grasso, A, Grube, B, Gushterski, R, Guskov, A, Guthörl, T, Haas, F, von Harrach, D, Hahne, D, Heinsius, F H, Herrmann, F, Hess, C, Hinterberger, F, Höppner, 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, Königsmann, K, Konorov, I, Konstantinov, V F, Kotzinian, A M, Kouznetsov, O, Krämer, 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, Schlüter, T, Schmidt, A, Schmidt, K, Schmitt, L, Schmïden, H, Schönning, 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, Ziembicki, M
Lenguaje:eng
Publicado: 2013
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1016/j.physletb.2014.02.005
http://cds.cern.ch/record/1604430
Descripción
Sumario: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.

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