/ Experiment-HEP arXiv:1007.1562


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


Alekseev, M G (INFN, Turin) ; Alexakhin, V Yu (Dubna, JINR) ; Alexandrov, Yu (Lebedev Inst.) ; Alexeev, G D (Dubna, JINR) ; Amoroso, A (Turin U.) ; Austregesilo, A (CERN) ; Badelek, B (Warsaw, Inst. Nucl. Studies) ; Balestra, F (Turin U.) ; Barth, J (Bonn U.) ; Baum, G (Bielefeld U.) ; Bedfer, Y (SPhN, DAPNIA, Saclay) ; Bernhard, J (Mainz U., Inst. Kernphys.) ; Bertini, R (Turin U.) ; Bettinelli, M (Munich U.) ; Birsa, R (INFN, Trieste) ; Bisplinghoff, J (Bonn U., HISKP) ; Bordalo, P (Lisbon, LIFEP) ; Bradamante, F (Trieste U.) ; Bravar, A (INFN, Trieste) ; Bressan, A (Trieste U.) ; Brona, G (CERN) ; Burtin, E (SPhN, DAPNIA, Saclay) ; Bussa, M P (Turin U.) ; Chaberny, D (Mainz U., Inst. Kernphys.) ; Chiosso, M (Turin U.) ; Chung, S U (Munich, Tech. U.) ; Cicuttin, A (ICTP, Trieste) ; Colantoni, M (INFN, Turin) ; Crespo, M L (ICTP, Trieste) ; Dalla Torre, S (INFN, Trieste) ; Das, S (Matrivani Inst., Calcutta) ; Dasgupta, S S (Matrivani Inst., Calcutta) ; Denisov, O Yu (CERN) ; Dhara, L (Matrivani Inst., Calcutta) ; Diaz, V (ICTP, Trieste) ; Donskov, S V (Serpukhov, IHEP) ; Doshita, N (Bochum U.) ; Duic, V (Trieste U.) ; Dnnweber, W (Munich U.) ; Efremov, A (Dubna, JINR) ; El Alaoui, A (SPhN, DAPNIA, Saclay) ; Eversheim, P D (Bonn U., HISKP) ; Eyrich, W (Erlangen - Nuremberg U.) ; Faessler, M (Munich U.) ; Ferrero, A (SPhN, DAPNIA, Saclay) ; Filin, A (Serpukhov, IHEP) ; Finger, M (Charles U.) ; Finger, M Jr (Dubna, JINR) ; Fischer, H (Freiburg U.) ; Franco, C (Lisbon, LIFEP) ; Friedrich, J M (Munich, Tech. U.) ; Garfagnini, R (Turin U.) ; Gautheron, F (Bochum U.) ; Gavrichtchouk, O P (Dubna, JINR) ; Gazda, R (Warsaw, Inst. Nucl. Studies) ; Gerassimov, S (Lebedev Inst.) ; Geyer, R (Munich U.) ; Giorgi, M (Trieste U.) ; Gnesi, I (Turin U.) ; Gobbo, B (Bochum U.) ; Goertz, S (Bochum U.) ; Grabmller, S (Munich, Tech. U.) ; Grasso, A (Turin U.) ; Grube, B (Munich, Tech. U.) ; Gushterski, R (Dubna, JINR) ; Guskov, A (Dubna, JINR) ; Haas, F (Munich, Tech. U.) ; von Harrach, D (Mainz U., Inst. Kernphys.) ; Hasegawa, T (Miyazaki U.) ; Heinsius, F H (Freiburg U.) ; Herrmann, F (Freiburg U.) ; He, C (Bochum U.) ; Hinterberger, F (Bonn U., HISKP) ; Horikawa, N (Nagoya U.) ; Hppner, Ch (Munich, Tech. U.) ; dHose, N (SPhN, DAPNIA, Saclay) ; Ilgner, C (CERN) ; Ishimoto, S (Nagoya U.) ; Ivanov, O (Dubna, JINR) ; Ivanshin, Yu (Dubna, JINR) ; Iwata, T (Yamagata U.) ; Jahn, R (Bonn U., HISKP) ; Jasinski, P (Mainz U., Inst. Kernphys.) ; Jegou, G (SPhN, DAPNIA, Saclay) ; Joosten, R (Bonn U., HISKP) ; Kabu, E (Mainz U., Inst. Kernphys.) ; Kang, D (Freiburg U.) ; Ketzer, B (Munich, Tech. U.) ; Khaustov, G V (Serpukhov, IHEP) ; Khokhlov, Yu A (Serpukhov, IHEP) ; Kisselev, Yu (Bochum U.) ; Klein, F (Bonn U.) ; Klimaszewski, K (Warsaw, Inst. Nucl. Studies) ; Koblitz, S (Mainz U., Inst. Kernphys.) ; Koivuniemi, J H (Bochum U.) ; Kolosov, V N (Serpukhov, IHEP) ; Kondo, K (Bochum U.) ; Knigsmann, K (Freiburg U.) ; Konopka, R (Munich, Tech. U.) ; Konorov, I (Lebedev Inst.) ; Konstantinov, V F (Serpukhov, IHEP) ; Korzenev, A (Mainz U., Inst. Kernphys.) ; Kotzinian, A M (Turin U.) ; Kouznetsov, O (Dubna, JINR) ; Kowalik, K (Warsaw, Inst. Nucl. Studies) ; Krmer, M (Munich, Tech. U.) ; Kral, A (Prague, Tech. U.) ; Kroumchtein, Z V (Dubna, JINR) ; Kuhn, R (Munich, Tech. U.) ; Kunne, F (SPhN, DAPNIA, Saclay) ; Kurek, K (Warsaw, Inst. Nucl. Studies) ; Lauser, L (Freiburg U.) ; Le Goff, J M (SPhN, DAPNIA, Saclay) ; Lednev, A A (Serpukhov, IHEP) ; Lehmann, A (Erlangen - Nuremberg U.) ; Levorato, S (Trieste U.) ; Lichtenstadt, J (Tel Aviv U.) ; Liska, T (Prague, Tech. U.) ; Maggiora, A (INFN, Turin) ; Maggiora, M (Turin U.) ; Magnon, A (SPhN, DAPNIA, Saclay) ; Mallot, G K (CERN) ; Mann, A (Munich, Tech. U.) ; Marchand, C (SPhN, DAPNIA, Saclay) ; Martin, A (Trieste U.) ; Marzec, J (Warsaw U. of Tech.) ; Massmann, F (Bonn U., HISKP) ; Matsuda, T (Miyazaki U.) ; Meyer, W (Bochum U.) ; Michigami, T (Yamagata U.) ; Mikhailov, Yu V (Serpukhov, IHEP) ; Moinester, M A (Tel Aviv U.) ; Mutter, A (Freiburg U.) ; Nagaytsev, A (Dubna, JINR) ; Nagel, T (Munich, Tech. U.) ; Nassalski, J (Warsaw, Inst. Nucl. Studies) ; Negrini, T (Bonn U., HISKP) ; Nerling, F (Freiburg U.) ; Neubert, S (Munich, Tech. U.) ; Neyret, D (SPhN, DAPNIA, Saclay) ; Nikolaenko, V I (Serpukhov, IHEP) ; Nunes, A S (Lisbon, LIFEP) ; Olshevsky, A G (Dubna, JINR) ; Ostrick, M (Mainz U., Inst. Kernphys.) ; Padee, A (Warsaw U. of Tech.) ; Panknin, R (Bonn U.) ; Panzieri, D (Piemonte Orientale U., Alessandria) ; Parsamyan, B (Turin U.) ; Paul, S (Munich, Tech. U.) ; Pawlukiewicz-Kaminska, B (Warsaw, Inst. Nucl. Studies) ; Perevalova, E (Dubna, JINR) ; Pesaro, G (Trieste U.) ; Peshekhonov, D V (Dubna, JINR) ; Piragino, G (Turin U.) ; Platchkov, S (SPhN, DAPNIA, Saclay) ; Pochodzalla, J (Mainz U., Inst. Kernphys.) ; Polak, J (Liberec Tech. U.) ; Polyakov, V A (Serpukhov, IHEP) ; Pontecorvo, G (Dubna, JINR) ; Pretz, J (Bonn U.) ; Quintans, C (Lisbon, LIFEP) ; Rajotte, J F (Munich U.) ; Ramos, S (Lisbon, LIFEP) ; Rapatsky, V (Dubna, JINR) ; Reicherz, G (Bochum U.) ; Richter, A (Erlangen - Nuremberg U.) ; Robinet, F (SPhN, DAPNIA, Saclay) ; Rocco, E (Turin U.) ; Rondio, E (Warsaw, Inst. Nucl. Studies) ; Ryabchikov, D I (Serpukhov, IHEP) ; Samoylenko, V D (Serpukhov, IHEP) ; Sandacz, A (Warsaw, Inst. Nucl. Studies) ; Santos, H (Lisbon, LIFEP) ; Sapozhnikov, M G (Dubna, JINR) ; Sarkar, S (Matrivani Inst., Calcutta) ; Savin, Igor A. (Dubna, JINR) ; Sbrizzai, G (Trieste U.) ; Schiavon, P (Trieste U.) ; Schill, C (Freiburg U.) ; Schlter, T (Munich U.) ; Schmitt, L (Munich, Tech. U.) ; Schopferer, S (Freiburg U.) ; Schrder, W (Erlangen - Nuremberg U.) ; Shevchenko, O Yu (Dubna, JINR) ; Siebert, H W (Mainz U., Inst. Kernphys.) ; Silva, L (Lisbon, LIFEP) ; Sinha, L (Matrivani Inst., Calcutta) ; Sissakian, A N (Dubna, JINR) ; Slunecka, M (Dubna, JINR) ; Smirnov, G I (Dubna, JINR) ; Sosio, S (Turin U.) ; Sozzi, F (Trieste U.) ; Srnka, A (Inst. Sci. Instruments, Brno) ; Stolarski, M (CERN) ; Sulc, M (Liberec Tech. U.) ; Sulej, R (Warsaw U. of Tech.) ; Takekawa, S (Trieste U.) ; Tessaro, S (INFN, Trieste) ; Tessarotto, F (INFN, Trieste) ; Teufel, A (Erlangen - Nuremberg U.) ; Tkatchev, L G (Dubna, JINR) ; Uhl, S (Munich, Tech. U.) ; Uman, I (Munich U.) ; Virius, M (Prague, Tech. U.) ; Vlassov, N V (Dubna, JINR) ; Vossen, A (Freiburg U.) ; Weitzel, Q (Munich, Tech. U.) ; Windmolders, R (Bonn U.) ; Wislicki, W (Warsaw, Inst. Nucl. Studies) ; Wollny, H (Freiburg U.) ; Zaremba, K (Warsaw U. of Tech.) ; Zavertyaev, M (Lebedev Inst.) ; Zemlyanichkina, E (Dubna, JINR) ; Ziembicki, M (Warsaw U. of Tech.) ; Zhao, J (Mainz U., Inst. Kernphys.) ; Zhuravlev, N (Dubna, JINR) ; Zvyagin, A (Munich U.)

Published in: Eur. Phys. J. C
Pages: 12

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.

Keyword(s): lepton deep inelastic scattering ; polarisation ; spin asymmetry ; parton distribution functions


Note: COMPASS Collaboration

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 Record created 2010-10-29, last modified 2014-01-30



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