Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high $p_T$

We measured the longitudinal double spin asymmetries $A_{LL}$ for single hadron muo-production off protons and deuterons at photon virtuality $Q^2$ < 1(GeV/$\it c$)$^2$ for transverse hadron momenta $p_T$ in the range 0.7 GeV/$\it c$ to 4 GeV/$\it c$ . They were determined using COMPASS data take...

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Detalles Bibliográficos
Autores principales: Adolph, C, Akhunzyanov, R, Alexeev, M G, Alexeev, G D, Amoroso, A, Andrieux, 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, R, Bisplinghoff, J, Bodlak, M, Boer, M, Bordalo, P, Bradamante, F, Braun, C, Bressan, A, Büchele, M, Burtin, E, 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, Dünnweber, W, Dziewiecki, M, Efremov, A, Eversheim, P D, Eyrich, W, Faessler, M, Ferrero, A, Finger, M, Finger, M., Jr., 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, 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, Jörg, 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, Königsmann, K, Konorov, I, Konstantinov, V F, Kotzinian, A M, Kouznetsov, O, Krämer, M, Kremser, P, Krinner, F, 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, Longo, R, Maggiora, A, Magnon, A, Makins, N, Makke, N, Mallot, G K, Marchand, C, Marianski, B, Martin, A, Marzec, J, Matoušek, 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, 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, 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, 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, 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, Zink, A
Lenguaje:eng
Publicado: 2015
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1016/j.physletb.2015.12.035
http://cds.cern.ch/record/2052089
Descripción
Sumario:We measured the longitudinal double spin asymmetries $A_{LL}$ for single hadron muo-production off protons and deuterons at photon virtuality $Q^2$ < 1(GeV/$\it c$)$^2$ for transverse hadron momenta $p_T$ in the range 0.7 GeV/$\it c$ to 4 GeV/$\it c$ . They were determined using COMPASS data taken with a polarised muon beam of 160 GeV/$\it c$ or 200 GeV/$\it c$ impinging on polarised $\mathrm{{}^6LiD}$ or $\mathrm{NH_3}$ targets. The experimental asymmetries are compared to next-to-leading order pQCD calculations, and are sensitive to the gluon polarisation $\Delta G$ inside the nucleon in the range of the nucleon momentum fraction carried by gluons $0.05 < x_g < 0.2$.

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