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Measurement of the Collins and Sivers asymmetries on transversely polarised protons

  • M. G. Alekseev
  • , V. Yu Alexakhin
  • , Yu Alexandrov
  • , G. D. Alexeev
  • , A. Amoroso
  • , A. Austregesilo
  • , B. Badełek
  • , F. Balestra
  • , J. Ball
  • , J. Barth
  • , G. Baum
  • , Y. Bedfer
  • , J. Bernhard
  • , R. Bertini
  • , M. Bettinelli
  • , R. Birsa
  • , J. Bisplinghoff
  • , P. Bordalo
  • , F. Bradamante
  • , A. Bravar
  • A. Bressan, G. Brona, E. Burtin, M. P. Bussa, D. Chaberny, M. Chiosso, S. U. Chung, A. Cicuttin, M. Colantoni, M. L. Crespo, S. Dalla Torre, S. Das, S. S. Dasgupta, O. Yu Denisov, L. Dhara, V. Diaz, S. V. Donskov, N. Doshita, V. Duic, W. Dünnweber, A. Efremov, A. El Alaoui, C. Elia, P. D. Eversheim, W. Eyrich, M. Faessler, A. Ferrero, A. Filin, M. Finger, M. Finger, H. Fischer, C. Franco, J. M. Friedrich, R. Garfagnini, F. Gautheron, O. P. Gavrichtchouk, R. Gazda, S. Gerassimov, R. Geyer, M. Giorgi, I. Gnesi, B. Gobbo, S. Goertz, S. Grabmüller, A. Grasso, B. Grube, R. Gushterski, A. Guskov, F. Haas, D. von Harrach, T. Hasegawa, F. H. Heinsius, R. Hermann, F. Herrmann, C. Heß, F. Hinterberger, N. Horikawa, Ch Höppner, N. d'Hose, C. Ilgner, S. Ishimoto, O. Ivanov, Yu Ivanshin, T. Iwata, R. Jahn, P. Jasinski, G. Jegou, R. Joosten, E. Kabuß, W. Käfer, D. Kang, B. Ketzer, G. V. Khaustov, Yu A. Khokhlov, Yu Kisselev, F. Klein, K. Klimaszewski, S. Koblitz, J. H. Koivuniemi, V. N. Kolosov, K. Kondo, K. Königsmann, R. Konopka, I. Konorov, V. F. Konstantinov, A. Korzenev, A. M. Kotzinian, O. Kouznetsov, K. Kowalik, M. Krämer, A. Kral, Z. V. Kroumchtein, R. Kuhn, F. Kunne, K. Kurek, L. Lauser, J. M. Le Goff, A. A. Lednev, A. Lehmann, S. Levorato, J. Lichtenstadt, T. Liska, A. Maggiora, M. Maggiora, A. Magnon, G. K. Mallot, A. Mann, C. Marchand, A. Martin, J. Marzec, F. Massmann, T. Matsuda, W. Meyer, T. Michigami, Yu V. Mikhailov, M. A. Moinester, A. Mutter, A. Nagaytsev, T. Nagel, J. Nassalski, T. Negrini, F. Nerling, S. Neubert, D. Neyret, V. I. Nikolaenko, A. S. Nunes, A. G. Olshevsky, M. Ostrick, A. Padee, R. Panknin, D. Panzieri, B. Parsamyan, S. Paul, B. Pawlukiewicz-Kaminska, E. Perevalova, G. Pesaro, D. V. Peshekhonov, G. Piragino, S. Platchkov, J. Pochodzalla, J. Polak, V. A. Polyakov, G. Pontecorvo, J. Pretz, C. Quintans, J. F. Rajotte, S. Ramos, V. Rapatsky, G. Reicherz, A. Richter, F. Robinet, E. Rocco, E. Rondio, D. I. Ryabchikov, V. D. Samoylenko, A. Sandacz, H. Santos, M. G. Sapozhnikov, S. Sarkar, I. A. Savin, G. Sbrizzai, P. Schiavon, C. Schill, T. Schlüter, L. Schmitt, S. Schopferer, W. Schröder, O. Yu Shevchenko, H. W. Siebert, L. Silva, L. Sinha, A. N. Sissakian, M. Slunecka, G. I. Smirnov, S. Sosio, F. Sozzi, A. Srnka, M. Stolarski, M. Sulc, R. Sulej, S. Takekawa, S. Tessaro, F. Tessarotto, A. Teufel, L. G. Tkatchev, S. Uhl, I. Uman, M. Virius, N. V. Vlassov, A. Vossen, Q. Weitzel, R. Windmolders, W. Wiślicki, H. Wollny, K. Zaremba, M. Zavertyaev, E. Zemlyanichkina, M. Ziembicki, J. Zhao, N. Zhuravlev, A. Zvyagin
  • INFN Sez. di Torino
  • Joint Inst. for Nuclear Research
  • Institute of Scientific Instruments of the Academy of Sciences of the Czech Republic
  • University of Torino
  • European Organization for Nuclear Research
  • Technical University of Munich
  • Institute of Plasma Physics and Laser Microfusion
  • CEA Saclay
  • University of Bonn
  • Universität Bielefeld
  • Johannes Gutenberg University
  • University of Munich
  • INFN- Sezione di Trieste
  • LIP - Lisboa
  • University of Trieste Via A
  • Matrivani Inst. Exp. Res. and Educ.
  • Institute for High Energy Physics (IHEP)
  • Yamagata University
  • Friedrich Alexander Universität Erlangen-Nürnberg
  • Charles University
  • University of Freiburg
  • Max-Planck-lnstitut für Kohlenforschung
  • P.N. Lebedev Physical Institute of the Russian Academy of Sciences
  • University of Miyazaki
  • Nagoya University
  • Czech Technical University in Prague
  • Tel Aviv University
  • Warsaw Institute of Technology
  • University of Eastern Piedmont
  • Technical University of Liberec

Research output: Contribution to journalArticlepeer-review

185 Scopus citations

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 strongly support the present theoretical interpretation of these asymmetries, in terms of leading-twist quark distribution and fragmentation functions.

Original languageEnglish
Pages (from-to)240-246
Number of pages7
JournalPhysics Letters B
Volume692
Issue number4
DOIs
StatePublished - 2010

Keywords

  • COMPASS
  • Collins asymmetry
  • Proton
  • Sivers asymmetry
  • Transverse spin effects

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