Home > CERN Experiments > SPS Experiments > COMPASS > COMPASS Conference Proceedings > Experimental investigation of transverse spin asymmetries in muon-p SIDIS processes: Sivers asymmetries |
Article | |
Report number | arXiv:1205.5122 ; CERN-PH-EP-2012-147 ; CERN-PH-EP-2012-147 |
Title | Experimental investigation of transverse spin asymmetries in muon-p SIDIS processes: Sivers asymmetries |
Author(s) |
Adolph, C. (Erlangen - Nuremberg U.) ; Alekseev, M.G. (INFN, Trieste) ; Alexakhin, V.Yu. (Dubna, JINR) ; Alexandrov, Yu. (Lebedev Inst.) ; Alexeev, G.D. (Dubna, JINR) ; Amoroso, A. (INFN, Turin ; Turin U.) ; Antonov, A.A. (Dubna, JINR) ; Austregesilo, A. (Munich, Tech. U. ; CERN) ; Badelek, B. (Warsaw U. ; Democritos Nucl. Res. Ctr.) ; Balestra, F. (INFN, Turin ; Turin U.) ; Barth, J. (Bonn U.) ; Baum, G. (Bielefeld U.) ; Bedfer, Y. (DAPNIA, Saclay) ; Bernhard, J. (Mainz U., Inst. Kernphys.) ; Bertini, R. (INFN, Turin ; Turin U.) ; Bettinelli, M. (Munich U.) ; Bicker, K. (Munich, Tech. U. ; CERN) ; Bieling, J. (Bonn U.) ; Birsa, R. (INFN, Trieste) ; Bisplinghoff, J. (Bonn U.) ; Bordalo, P. (LIP, Lisbon) ; Bradamante, F. (INFN, Trieste ; Trieste U.) ; Braun, C. (Erlangen - Nuremberg U.) ; Bravar, A. (INFN, Trieste) ; Bressan, A. (INFN, Trieste ; Trieste U.) ; Burtin, E. (DAPNIA, Saclay) ; Capozza, L. (DAPNIA, Saclay) ; Chiosso, M. (INFN, Turin ; Turin U.) ; Chung, S.U. (Munich, Tech. U.) ; Cicuttin, A. (INFN, Trieste ; ICTP, Trieste) ; Crespo, M.L. (INFN, Trieste ; ICTP, Trieste) ; Dalla Torre, S. (INFN, Trieste) ; Das, S. (Matrivani Inst., Calcutta) ; Dasgupta, S.S. (Matrivani Inst., Calcutta) ; Dasgupta, S. (Matrivani Inst., Calcutta) ; Denisov, O.Yu. (INFN, Turin) ; Dhara, L. (Matrivani Inst., Calcutta) ; Donskov, S.V. (Serpukhov, IHEP) ; Doshita, N. (Yamagata U.) ; Duic, V. (INFN, Trieste ; Trieste U.) ; Dunnweber, W. (Munich U.) ; Dziewiecki, M. (Warsaw U. of Tech.) ; Efremov, A. (Dubna, JINR) ; Elia, C. (INFN, Trieste ; Trieste U.) ; Eversheim, P.D. (Bonn U.) ; Eyrich, W. (Erlangen - Nuremberg U.) ; Faessler, M. (Munich U.) ; Ferrero, A. (DAPNIA, Saclay) ; Filin, A. (Serpukhov, IHEP) ; Finger, Miroslav (Charles U.) ; Finger, Michael, Jr. (Dubna, JINR) ; Fischer, H. (Freiburg U.) ; Franco, C. (LIP, Lisbon) ; von Hohenesche, N.du Fresne (CERN ; Mainz U., Inst. Kernphys.) ; Friedrich, J.M. (Munich, Tech. U.) ; Frolov, V. (CERN) ; Garfagnini, R. (INFN, Turin ; Turin U.) ; Gautheron, F. (Ruhr U., Bochum) ; Gavrichtchouk, O.P. (Dubna, JINR) ; Gerassimov, S. (Munich, Tech. U. ; Lebedev Inst.) ; Geyer, R. (Munich U.) ; Giorgi, M. (INFN, Trieste ; Trieste U.) ; Gnesi, I. (INFN, Turin ; Turin U.) ; Gobbo, B. (INFN, Trieste) ; Goertz, S. (Bonn U.) ; Grabmuller, S. (Munich, Tech. U.) ; Grasso, A. (INFN, Turin ; Turin U.) ; Grube, B. (Munich, Tech. U.) ; Gushterski, R. (Dubna, JINR) ; Guskov, A. (Dubna, JINR) ; Guthorl, T. (Freiburg U.) ; Haas, F. (Munich, Tech. U.) ; von Harrach, D. (Mainz U., Inst. Kernphys.) ; Heinsius, F.H. (Freiburg U.) ; Herrmann, F. (Freiburg U.) ; Hess, C. (Ruhr U., Bochum) ; Hinterberger, F. (Bonn U.) ; Horikawa, N. (Nagoya U.) ; Hoppner, Ch. (Munich, Tech. U.) ; d'Hose, N. (DAPNIA, Saclay) ; Ishimoto, S. (Yamagata U.) ; Ivanov, O. (Dubna, JINR) ; Ivanshin, Yu. (Dubna, JINR) ; Iwata, T. (Yamagata U.) ; Jahn, R. (Bonn U.) ; Jary, V. (Prague, Tech. U.) ; Jasinski, P. (Mainz U., Inst. Kernphys.) ; Joosten, R. (Bonn U.) ; Kabuss, E. (Mainz U., Inst. Kernphys.) ; Kang, D. (Mainz U., Inst. Kernphys.) ; Ketzer, B. (Munich, Tech. U.) ; Khaustov, G.V. (Serpukhov, IHEP) ; Khokhlov, Yu.A. (Serpukhov, IHEP) ; Kisselev, Yu. (Ruhr U., Bochum) ; Klein, F. (Bonn U.) ; Klimaszewski, K. (Warsaw U. ; Democritos Nucl. Res. Ctr.) ; Koblitz, S. (Mainz U., Inst. Kernphys.) ; Koivuniemi, J.H. (Ruhr U., Bochum) ; Kolosov, V.N. (Serpukhov, IHEP) ; Kondo, K. (Yamagata U.) ; Konigsmann, K. (Freiburg U.) ; Konorov, I. (Munich, Tech. U. ; Lebedev Inst.) ; Konstantinov, V.F. (Serpukhov, IHEP) ; Korzenev, A. (DAPNIA, Saclay) ; Kotzinian, A.M. (INFN, Turin ; Turin U.) ; Kouznetsov, O. (DAPNIA, Saclay ; Dubna, JINR) ; Kramer, M. (Munich, Tech. U.) ; Kroumchtein, Z.V. (Dubna, JINR) ; Kunne, F. (DAPNIA, Saclay) ; Kurek, K. (Warsaw U. ; Democritos Nucl. Res. Ctr.) ; Lauser, L. (Freiburg U.) ; Lednev, A.A. (Serpukhov, IHEP) ; Lehmann, A. (Erlangen - Nuremberg U.) ; Levorato, S. (INFN, Trieste ; Trieste U.) ; Lichtenstadt, J. (Tel Aviv U.) ; Liska, T. (Prague, Tech. U.) ; Maggiora, A. (INFN, Turin) ; Magnon, A. (DAPNIA, Saclay) ; Makke, N. (INFN, Trieste ; Trieste U. ; DAPNIA, Saclay) ; Mallot, G.K. (CERN) ; Mann, A. (Munich, Tech. U.) ; Marchand, C. (DAPNIA, Saclay) ; Martin, A. (INFN, Trieste ; Trieste U.) ; Marzec, J. (Warsaw U. of Tech.) ; Matsuda, T. (Miyazaki U.) ; Meshcheryakov, G. (Dubna, JINR) ; Meyer, W. (Ruhr U., Bochum) ; Michigami, T. (Yamagata U.) ; Mikhailov, Yu.V. (Serpukhov, IHEP) ; Moinester, M.A. (Tel Aviv U.) ; Morreale, A. (DAPNIA, Saclay) ; Mutter, A. (Mainz U., Inst. Kernphys. ; Freiburg U.) ; Nagaytsev, A. (Dubna, JINR) ; Nagel, T. (Munich, Tech. U.) ; Negrini, T. (Freiburg U.) ; Nerling, F. (Freiburg U.) ; Neubert, S. (Munich, Tech. U.) ; Neyret, D. (DAPNIA, Saclay) ; Nikolaenko, V.I. (Serpukhov, IHEP) ; Nowak, W.D. (Freiburg U.) ; Nunes, A.S. (LIP, Lisbon) ; Olshevsky, A.G. (Dubna, JINR) ; Ostrick, M. (Mainz U., Inst. Kernphys.) ; Padee, A. (Warsaw U. of Tech.) ; Panknin, R. (Bonn U.) ; Panzieri, D. (INFN, Turin ; Piemonte Orientale U., Alessandria) ; Parsamyan, B. (INFN, Turin ; Turin U.) ; Paul, S. (Munich, Tech. U.) ; Perevalova, E. (Dubna, JINR) ; Pesaro, G. (INFN, Trieste ; Trieste U.) ; Peshekhonov, D.V. (Dubna, JINR) ; Piragino, G. (INFN, Turin ; Turin U.) ; Platchkov, S. (DAPNIA, Saclay) ; Pochodzalla, J. (Mainz U., Inst. Kernphys.) ; Polak, J. (INFN, Trieste ; Trieste U. ; Liberec Tech. U.) ; Polyakov, V.A. (Serpukhov, IHEP) ; Pretz, J. (Bonn U.) ; Quaresma, M. (LIP, Lisbon) ; Quintans, C. (LIP, Lisbon) ; Rajotte, J.F. (Munich U.) ; Ramos, S. (LIP, Lisbon) ; Rapatsky, V. (Dubna, JINR) ; Reicherz, G. (Ruhr U., Bochum) ; Richter, A. (Erlangen - Nuremberg U.) ; Rocco, E. (CERN) ; Rondio, E. (Warsaw U. ; Democritos Nucl. Res. Ctr.) ; Rossiyskaya, N.S. (Dubna, JINR) ; Ryabchikov, D.I. (Serpukhov, IHEP) ; Samoylenko, V.D. (Serpukhov, IHEP) ; Sandacz, A. (Warsaw U. ; Democritos Nucl. Res. Ctr.) ; Sapozhnikov, M.G. (Dubna, JINR) ; Sarkar, S. (Matrivani Inst., Calcutta) ; Savin, I.A. (Dubna, JINR) ; Sbrizzai, G. (INFN, Trieste ; Trieste U.) ; Schiavon, P. (INFN, Trieste ; Trieste U.) ; Schill, C. (Freiburg U.) ; Schluter, T. (Munich U.) ; Schmidt, K. (Freiburg U.) ; Schmitt, L. (Munich, Tech. U.) ; Schonning, K. (CERN) ; Schopferer, S. (Freiburg U.) ; Schott, M. (CERN) ; Schroder, W. (Erlangen - Nuremberg U.) ; Shevchenko, O.Yu. (Dubna, JINR) ; Silva, L. (LIP, Lisbon) ; Sinha, L. (Matrivani Inst., Calcutta) ; Sissakian, A.N. (Dubna, JINR) ; Slunecka, M. (Dubna, JINR) ; Smirnov, G.I. (Dubna, JINR) ; Sosio, S. (INFN, Turin ; Turin U.) ; Sozzi, F. (INFN, Trieste) ; Srnka, A. (Inst. Sci. Instruments, Brno) ; Steiger, L. (INFN, Trieste) ; Stolarski, M. (LIP, Lisbon) ; Sulc, M. (Liberec Tech. U.) ; Sulej, R. (Warsaw U. ; Democritos Nucl. Res. Ctr.) ; Suzuki, H. (Yamagata U.) ; Sznajder, P. (Warsaw U. ; Democritos Nucl. Res. Ctr.) ; Takekawa, S. (INFN, Turin) ; Wolbeek, J.Ter (Freiburg U.) ; Tessaro, S. (INFN, Trieste) ; Tessarotto, F. (INFN, Trieste) ; Tkatchev, L.G. (Dubna, JINR) ; Uhl, S. (Munich, Tech. U.) ; Uman, I. (Munich U.) ; Vandenbroucke, M. (DAPNIA, Saclay) ; Virius, M. (Prague, Tech. U.) ; Vlassov, N.V. (Dubna, JINR) ; Wang, L. (Ruhr U., Bochum) ; Wilfert, M. (Mainz U., Inst. Kernphys.) ; Windmolders, R. (Bonn U.) ; Wislicki, W. (Warsaw U. ; Democritos Nucl. Res. Ctr.) ; Wollny, H. (DAPNIA, Saclay ; Freiburg U.) ; Zaremba, K. (Warsaw U. of Tech.) ; Zavertyaev, M. (Lebedev Inst.) ; Zemlyanichkina, E. (Dubna, JINR) ; Ziembicki, M. (Warsaw U. of Tech.) ; Zhuravlev, N. (Dubna, JINR) ; Zvyagin, A. (Munich U.) |
Publication | 2012-10-31 |
Imprint | 17 May 2012 |
Number of pages | 7 |
Note | Comments: 11 pages, 6 figures 11 pages, 6 figures |
In: | Phys. Lett. B 717 (2012) 383 |
DOI | 10.1016/j.physletb.2012.09.056 |
Subject category | Particle Physics - Experiment |
Accelerator/Facility, Experiment | CERN SPS ; COMPASS NA58 |
Free keywords | QCD ; experimental results ; COMPASS ; SIDIS ; SIVERS asymmetries |
Abstract | The COMPASS Collaboration at CERN has measured the transverse spin azimuthal asymmetry of charged hadrons produced in semi-inclusive deep inelastic scattering using a 160 GeV positive muon beam and a transversely polarised NH_3 target. The Sivers asymmetry of the proton has been extracted in the Bjorken x range 0.003<x<0.7. The new measurements have small statistical and systematic uncertainties of a few percent and confirm with considerably better accuracy the previous COMPASS measurement. The Sivers asymmetry is found to be compatible with zero for negative hadrons and positive for positive hadrons, a clear indication of a spin-orbit coupling of quarks in a transversely polarised proton. As compared to measurements at lower energy, a smaller Sivers asymmetry for positive hadrons is found in the region x > 0.03. The asymmetry is different from zero and positive also in the low x region, where sea-quarks dominate. The kinematic dependence of the asymmetry has also been investigated and results are given for various intervals of hadron and virtual photon fractional energy. In contrast to the case of the Collins asymmetry, the results on the Sivers asymmetry suggest a strong dependence on the four-momentum transfer to the nucleon, in agreement with the most recent calculations. |
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