/ hep-ex CERN-PH-EP-2015-245


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


Adolph, C (Erlangen - Nuremberg U.) ; Akhunzyanov, R (Dubna, JINR) ; Alexeev, M G (U. Turin, Exp. Phys.) ; Alexeev, G D (Dubna, JINR) ; Amoroso, A (INFN, Turin) ; Andrieux, V (IRFU, SPhN, Saclay) ; Anosov, V (Dubna, JINR) ; Augustyniak, W (Warsaw, Inst. Nucl. Studies) ; Austregesilo, A (Munich, Tech. U.) ; Azevedo, C D R (Aveiro U.) ; Badełek, B (Warsaw U.) ; Balestra, F (INFN, Turin) ; Barth, J (Bonn U.) ; Beck, R (Bonn U., HISKP) ; Bedfer, Y (CERN) ; Bernhard, J (CERN) ; Bicker, K (CERN) ; Bielert, E R (CERN) ; Birsa, R (INFN, Trieste) ; Bisplinghoff, J (Bonn U., HISKP) ; Bodlak, M (Charles U.) ; Boer, M (IRFU, SPhN, Saclay) ; Bordalo, P (IST, Lisbon (main)) ; Bradamante, F (INFN, Trieste) ; Braun, C (Erlangen - Nuremberg U.) ; Bressan, A (INFN, Trieste) ; Büchele, M (Freiburg U.) ; Burtin, E (IRFU, SPhN, Saclay) ; Chang, W-C (Taiwan, Inst. Phys.) ; Chiosso, M (INFN, Turin) ; Choi, I (Illinois U., Urbana) ; Chung, S U (Brookhaven) ; Cicuttin, A (INFN, Trieste) ; Crespo, M L (INFN, Trieste) ; Curiel, Q (IRFU, SPhN, Saclay) ; Dalla Torre, S (INFN, Trieste) ; Dasgupta, S S (Matrivani Inst., Calcutta) ; Dasgupta, S (INFN, Trieste) ; Denisov, O Yu (INFN, Turin) ; Dhara, L (Matrivani Inst., Calcutta) ; Donskov, S V (Kurchatov Inst., Moscow) ; Doshita, N (Yamagata U.) ; Duic, V (Trieste U.) ; Dünnweber, W (c) ; Dziewiecki, M (Warsaw U. of Tech., Inst. Radioelectr.) ; Efremov, A (Dubna, JINR) ; Eversheim, P D (Bonn U., HISKP) ; Eyrich, W (Erlangen - Nuremberg U.) ; Faessler, M ; Ferrero, A (IRFU, SPhN, Saclay) ; Finger, M (Charles U.) ; Finger jr , M (Charles U.) ; Fischer, H (Freiburg U.) ; Franco, C (LIP, Lisbon) ; du Fresne von Hohenesche, N (Mainz U., Inst. Kernphys.) ; Friedrich, J M (Munich, Tech. U.) ; Frolov, V (CERN) ; Fuchey, E (IRFU, SPhN, Saclay) ; Gautheron, F (Ruhr U., Bochum, Inst. Expt. Phys.) ; Gavrichtchouk, O P (Dubna, JINR) ; Gerassimov, S (Munich, Tech. U.) ; Giordano, F (Illinois U., Urbana) ; Gnesi, I (INFN, Turin) ; Gorzellik, M (Freiburg U.) ; Grabmüller, S (Munich, Tech. U.) ; Grasso, A (INFN, Turin) ; Grosse Perdekamp, M (Illinois U., Urbana) ; Grube, B (Munich, Tech. U.) ; Grussenmeyer, T (Freiburg U.) ; Guskov, A (Dubna, JINR) ; Haas, F (Munich, Tech. U.) ; Hahne, D (Bonn U.) ; von Harrach, D (Mainz U., Inst. Kernphys.) ; Hashimoto, R (Yamagata U.) ; Heinsius, F H (Freiburg U.) ; Herrmann, F (Freiburg U.) ; Hinterberger, F (Bonn U., HISKP) ; Horikawa, N (Chubu U.) ; d’Hose, N (IRFU, SPhN, Saclay) ; Hsieh, C-Y (Taiwan, Inst. Phys.) ; Huber, S (Munich, Tech. U.) ; Ishimoto, S (KEK, Tsukuba) ; Ivanov, A (Dubna, JINR) ; Ivanshin, Yu (Dubna, JINR) ; Iwata, T (Yamagata U.) ; Jahn, R (Bonn U., HISKP) ; Jary, V (CTU, Prague) ; Joosten, R (Bonn U., HISKP) ; Jörg, P (Freiburg U.) ; Kabuß, E (Mainz U., Inst. Kernphys.) ; Ketzer, B (Munich, Tech. U.) ; Khaustov, G V (Kurchatov Inst., Moscow) ; Khokhlov, Yu A (Moscow, MIPT) ; Kisselev, Yu (Dubna, JINR) ; Klein, F (Bonn U.) ; Klimaszewski, K (Warsaw, Inst. Nucl. Studies) ; Koivuniemi, J H (Ruhr U., Bochum, Inst. Expt. Phys.) ; Kolosov, V N (Kurchatov Inst., Moscow) ; Kondo, K (Yamagata U.) ; Königsmann, K (Freiburg U.) ; Konorov, I (Munich, Tech. U.) ; Konstantinov, V F (Kurchatov Inst., Moscow) ; Kotzinian, A M (INFN, Turin) ; Kouznetsov, O (Dubna, JINR) ; Krämer, M (Munich, Tech. U.) ; Kremser, P (Freiburg U.) ; Krinner, F (Munich, Tech. U.) ; Kroumchtein, Z V (Dubna, JINR) ; Kuchinski, N (Dubna, JINR) ; Kuhn, R (Munich, Tech. U.) ; Kunne, F (IRFU, SPhN, Saclay) ; Kurek, K (Warsaw, Inst. Nucl. Studies) ; Kurjata, R P (Warsaw U. of Tech., Inst. Radioelectr.) ; Lednev, A A (Kurchatov Inst., Moscow) ; Lehmann, A (Erlangen - Nuremberg U.) ; Levillain, M (IRFU, SPhN, Saclay) ; Levorato, S (INFN, Trieste) ; Lichtenstadt, J (Tel Aviv U. (main)) ; Longo, R (INFN, Turin) ; Maggiora, A (INFN, Turin) ; Magnon, A (IRFU, SPhN, Saclay) ; Makins, N (Illinois U., Urbana) ; Makke, N (INFN, Trieste) ; Mallot, G K (CERN) ; Marchand, C (IRFU, SPhN, Saclay) ; Marianski, B (Warsaw, Inst. Nucl. Studies) ; Martin, A (INFN, Trieste) ; Marzec, J (Warsaw U. of Tech., Inst. Radioelectr.) ; Matoušek, J (Charles U.) ; Matsuda, H (Yamagata U.) ; Matsuda, T (Miyazaki U.) ; Meshcheryakov, G (Dubna, JINR) ; Meyer, W (Ruhr U., Bochum, Inst. Expt. Phys.) ; Michigami, T (Yamagata U.) ; Mikhailov, Yu V (Kurchatov Inst., Moscow) ; Miyachi, Y (Yamagata U.) ; Montuenga, P (Illinois U., Urbana) ; Nagaytsev, A (Dubna, JINR) ; Nerling, F (Mainz U., Inst. Kernphys.) ; Neyret, D (IRFU, SPhN, Saclay) ; Nikolaenko, V I (Kurchatov Inst., Moscow) ; Nový, J (CERN) ; Nowak, W-D (Freiburg U.) ; Nukazuka, G (Yamagata U.) ; Nunes, A S (LIP, Lisbon) ; Olshevsky, A G (Dubna, JINR) ; Orlov, I (Dubna, JINR) ; Ostrick, M (Mainz U., Inst. Kernphys.) ; Panzieri, D (INFN, Turin) ; Parsamyan, B (INFN, Turin) ; Paul, S (Munich, Tech. U.) ; Peng, J-C (Illinois U., Urbana) ; Pereira, F (Aveiro U.) ; Pešek, M (Charles U.) ; Peshekhonov, D V (Dubna, JINR) ; Platchkov, S (IRFU, SPhN, Saclay) ; Pochodzalla, J (Mainz U., Inst. Kernphys.) ; Polyakov, V A (Kurchatov Inst., Moscow) ; Pretz, J (Bonn U.) ; Quaresma, M (LIP, Lisbon) ; Quintans, C (LIP, Lisbon) ; Ramos, S (IST, Lisbon (main)) ; Regali, C (Freiburg U.) ; Reicherz, G (Ruhr U., Bochum, Inst. Expt. Phys.) ; Riedl, C (Illinois U., Urbana) ; Rossiyskaya, N S (Dubna, JINR) ; Ryabchikov, D I (Kurchatov Inst., Moscow) ; Rychter, A (Warsaw U. of Tech., Inst. Radioelectr.) ; Samoylenko, V D (Kurchatov Inst., Moscow) ; Sandacz, A (Warsaw, Inst. Nucl. Studies) ; Santos, C (INFN, Trieste) ; Sarkar, S (Matrivani Inst., Calcutta) ; Savin, I A (Dubna, JINR) ; Sbrizzai, G (INFN, Trieste) ; Schiavon, P (INFN, Trieste) ; Schmidt, K (Freiburg U.) ; Schmieden, H (Bonn U.) ; Schönning, K (CERN) ; Schopferer, S (Freiburg U.) ; Selyunin, A (Dubna, JINR) ; Shevchenko, O Yu (Dubna, JINR) ; Silva, L (LIP, Lisbon) ; Sinha, L (Matrivani Inst., Calcutta) ; Sirtl, S (Freiburg U.) ; Slunecka, M (Dubna, JINR) ; Sozzi, F (INFN, Trieste) ; Srnka, A (Inst. Sci. Instruments, Brno) ; Stolarski, M (LIP, Lisbon) ; Sulc, M (Liberec Tech. U.) ; Suzuki, H (Chubu U.) ; Szabelski, A (Warsaw, Inst. Nucl. Studies) ; Szameitat, T (Freiburg U.) ; Sznajder, P (Warsaw, Inst. Nucl. Studies) ; Takekawa, S (INFN, Turin) ; Tessaro, S (INFN, Trieste) ; Tessarotto, F (INFN, Trieste) ; Thibaud, F (IRFU, SPhN, Saclay) ; Tosello, F (INFN, Turin) ; Tskhay, V (LPI, Moscow (main)) ; Uhl, S (Munich, Tech. U.) ; Veloso, J (Aveiro U.) ; Virius, M (CTU, Prague) ; Weisrock, T (Mainz U., Inst. Kernphys.) ; Wilfert, M (Mainz U., Inst. Kernphys.) ; ter Wolbeek, J (Freiburg U.) ; Zaremba, K (Warsaw U. of Tech., Inst. Radioelectr.) ; Zavertyaev, M (LPI, Moscow (main)) ; Zemlyanichkina, E (Dubna, JINR) ; Ziembicki, M (Warsaw U. of Tech., Inst. Radioelectr.) ; Zink, A (Erlangen - Nuremberg U.)

Pages: 12

Abstract: 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 $0.05 < x_g < 0.2$.

Web-Page: http://inspirehep.net/record/1393061/files/fig4b.png; http://inspirehep.net/record/1393061/files/fig4a.png; http://inspirehep.net/record/1393061/files/fig2.png; http://inspirehep.net/record/1393061/files/fig1a.png; http://inspirehep.net/record/1393061/files/fig1b.png; http://inspirehep.net/record/1393061/files/fig6.png; http://inspirehep.net/record/1393061/files/fig5.png; http://inspirehep.net/record/1393061/files/fig3.png; http://inspirehep.net/record/1393061/files/arXiv:1509.03526.pdf

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