/ Experiment-HEP arXiv:1005.5609


Measurement of the Collins and Sivers asymmetries on transversely polarised protons


Alekseev, M.G. (INFN, Turin) ; Alexakhin, V.Yu. (Dubna, JINR) ; Alexandrov, Yu. (Lebedev Inst.) ; Alexeev, G.D. (Dubna, JINR) ; Amoroso, A. (INFN, Turin) ; Austregesilo, A. (Munich, Tech. U.) ; Badelek, B. (Warsaw, Inst. Nucl. Studies) ; Balestra, F. (INFN, Turin) ; Ball, J. (SPhN, DAPNIA, Saclay) ; Barth, J. (Bonn U.) ; Baum, G. (Bielefeld U.) ; Bedfer, Y. (SPhN, DAPNIA, Saclay) ; Bernhard, J. (Mainz U., Inst. Kernphys.) ; Bertini, R. (INFN, Turin) ; Bettinelli, M. (Munich U.) ; Birsa, R. (INFN, Trieste) ; Bisplinghoff, J. (Bonn U., HISKP) ; Bordalo, P. (Lisbon, LIFEP) ; Bradamante, F. (INFN, Trieste) ; Bravar, A. (INFN, Trieste) ; Bressan, A. (INFN, Trieste) ; Brona, G. (Warsaw, Inst. Nucl. Studies) ; Burtin, E. (SPhN, DAPNIA, Saclay) ; Bussa, M.P. (INFN, Turin) ; Chaberny, D. (Mainz U., Inst. Kernphys.) ; Chiosso, M. (INFN, Turin) ; Chung, S.U. (Munich, Tech. U.) ; Cicuttin, A. (INFN, Trieste) ; Colantoni, M. (INFN, Turin) ; Crespo, M.L. (INFN, Trieste) ; Dalla Torre, S. (INFN, Trieste) ; Das, S. (Matrivani Inst., Calcutta) ; Dasgupta, S.S. (Matrivani Inst., Calcutta) ; Denisov, O.Yu. (INFN, Turin) ; Dhara, L. (Matrivani Inst., Calcutta) ; Diaz, V. (INFN, Trieste) ; Donskov, S.V. (Serpukhov, IHEP) ; Doshita, N. (Yamagata U.) ; Duic, V. (INFN, Trieste) ; Dunnweber, W. (Munich U.) ; Efremov, A. (Dubna, JINR) ; El Alaoui, A. (SPhN, DAPNIA, Saclay) ; Elia, C. (INFN, Trieste) ; 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. (INFN, Turin) ; Gautheron, F. (Ruhr U., Bochum) ; Gavrichtchouk, O.P. (Dubna, JINR) ; Gazda, R. (Warsaw, Inst. Nucl. Studies) ; Gerassimov, S. (Munich, Tech. U.) ; Geyer, R. (Munich U.) ; Giorgi, M. (INFN, Trieste) ; Gnesi, I. (INFN, Turin) ; Gobbo, B. (INFN, Trieste) ; Goertz, S. (Bonn U.) ; Grabmuller, S. (Munich, Tech. U.) ; Grasso, A. (INFN, Turin) ; 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.) ; Hermann, R. (Mainz U., Inst. Kernphys.) ; Herrmann, F. (Freiburg U.) ; Hess, C. (Ruhr U., Bochum) ; Hinterberger, F. (Bonn U., HISKP) ; Horikawa, N. (Nagoya U.) ; Hoppner, Ch. (Munich, Tech. U.) ; d'Hose, N. (SPhN, DAPNIA, Saclay) ; Ilgner, C. (Munich U.) ; 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) ; Kabuss, E. (Mainz U., Inst. Kernphys.) ; Kafer, W. (Freiburg U.) ; Kang, D. (Freiburg U.) ; Ketzer, B. (Munich, Tech. U.) ; Khaustov, G.V. (Serpukhov, IHEP) ; Khokhlov, Yu.A. (Serpukhov, IHEP) ; Kiefer, J. (Freiburg U.) ; Kisselev, Yu. (Ruhr U., Bochum) ; Klein, F. (Bonn U.) ; Klimaszewski, K. (Warsaw, Inst. Nucl. Studies) ; Koblitz, S. (Mainz U., Inst. Kernphys.) ; Koivuniemi, J.H. (Ruhr U., Bochum) ; Kolosov, V.N. (Serpukhov, IHEP) ; Komissarov, E.V. (Dubna, JINR) ; Kondo, K. (Yamagata U.) ; Konigsmann, K. (Freiburg U.) ; Konopka, R. (Munich, Tech. U.) ; Konorov, I. (Munich, Tech. U.) ; Konstantinov, V.F. (Serpukhov, IHEP) ; Korzenev, A. (Mainz U., Inst. Kernphys.) ; Kotzinian, A.M. (INFN, Turin) ; Kouznetsov, O. (SPhN, DAPNIA, Saclay) ; Kowalik, K. (SPhN, DAPNIA, Saclay) ; Kramer, 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. (INFN, Trieste) ; Lichtenstadt, J. (Tel Aviv U.) ; Liska, T. (Prague, Tech. U.) ; Maggiora, A. (INFN, Turin) ; Maggiora, M. (INFN, Turin) ; Magnon, A. (SPhN, DAPNIA, Saclay) ; Mallot, G.K. (CERN) ; Mann, A. (Munich, Tech. U.) ; Marchand, C. (SPhN, DAPNIA, Saclay) ; Martin, A. (INFN, Trieste) ; Marzec, J. (Warsaw U. of Tech.) ; Massmann, F. (Bonn U., HISKP) ; Matsuda, T. (Miyazaki U.) ; Meyer, W. (Ruhr U., Bochum) ; Michigami, T. (Yamagata U.) ; Mikhailov, Yu.V. (Serpukhov, IHEP) ; Moinester, M.A. (Tel Aviv U.) ; Mutter, A. (Mainz U., Inst. Kernphys.) ; 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. (INFN, Turin) ; Parsamyan, B. (INFN, Turin) ; Paul, S. (Munich, Tech. U.) ; Pawlukiewicz-Kaminska, B. (Warsaw, Inst. Nucl. Studies) ; Perevalova, E. (Dubna, JINR) ; Pesaro, G. (INFN, Trieste) ; Peshekhonov, D.V. (Dubna, JINR) ; Piragino, G. (INFN, Turin) ; Platchkov, S. (SPhN, DAPNIA, Saclay) ; Pochodzalla, J. (Mainz U., Inst. Kernphys.) ; Polak, J. (INFN, Trieste) ; 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. (Ruhr U., Bochum) ; Richter, A. (Erlangen - Nuremberg U.) ; Robinet, F. (SPhN, DAPNIA, Saclay) ; Rocco, E. (INFN, Turin) ; 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, I.A. (Dubna, JINR) ; Sbrizza, G. (INFN, Trieste) ; Schiavon, P. (INFN, Trieste) ; Schill, C. (Freiburg U.) ; Schluter, T. (Munich U.) ; Schmitt, L. (Munich, Tech. U.) ; Schopferer, S. (Freiburg U.) ; Schroder, 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. (INFN, Turin) ; Sozzi, F. (INFN, Trieste) ; Srnka, A. (Inst. Sci. Instruments, Brno) ; Stolarski, M. (CERN) ; Sulc, M. (Liberec Tech. U.) ; Sulej, R. (Warsaw U. of Tech.) ; Takekawa, S. (INFN, Trieste) ; 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. (INFN, Trieste) ; Zhuravlev, N. (Dubna, JINR) ; Zvyagin, A. (Munich U.)

Published in: Phys.Lett.
Year: 2010
Vol.: B692
Page No: 240-246
Pages: 9

Abstract: The Collins and Sivers asymmetries for charged hadrons produced in deeply inelastic scattering on transversely polarised protons have been extracted from the data collected in 2007 with the CERN SPS muon beam tuned at 160 GeV/c. At large values of the Bjorken x variable non-zero Collins asymmetries are observed both for positive and negative hadrons while the Sivers asymmetry for positive hadrons is slightly positive over almost all the measured x range. These results nicely support the present theoretical interpretation of these asymmetries, in terms of leading-twist quark distribution and fragmentation functions.

Keyword(s): Transverse spin effects ; Proton ; Collins asymmetry ; Sivers asymmetry ; COMPASS

Web-Page: http://durpdg.dur.ac.uk/cgi-hepdata/hepreac/8666857; http://inspirebeta.net/record/856645/files/figs_fig1_c.png; http://inspirebeta.net/record/856645/files/figs_fig2_s.png; http://inspirebeta.net/record/856645/files/figs_fig3_k.png; http://inspirebeta.net/record/856645/files/figs_fig4_w.png; http://inspirebeta.net/record/856645/files/figs_fig5_wk.png

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