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II - Experimental investigation of transverse spin asymmetries in mu-p SIDIS processes: Sivers asymmetries

C. Adolph 1 M.G. Alekseev V.Yu. Alexakhin Yu. Alexandrov G.D. Alexeev A. Amoroso A.A. Antonov A. Austregesilo B. Badełek F. Balestra 2 J. Barth G. Baum Y. Bedfer 3 J. Bernhard R. Bertini M. Bettinelli 4 K. Bicker J. Bieling R. Birsa J. Bisplinghoff P. Bordalo F. Bradamante C. Braun A. Bravar A. Bressan 5 E. Burtin 3 Leonardo Scapozza M. Chiosso S.U. Chung 6 A. Cicuttin 7 M.L. Crespo S. Dalla Torre S. Das 8 S.S. Dasgupta 9 O.Yu. Denisov L. Dhara S.V. Donskov N. Doshita V. Duic W. Dünnweber M. Dziewiecki A. Efremov C. Elia 10 P.D. Eversheim W. Eyrich M. Faessler A. Ferrero 3 A. Filin M. Finger H. Fischer 11 C. Franco 12 N. Du Fresne von Hohenesche 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 13 B. Grube R. Gushterski A. Guskov T. Guthörl F. Haas D. von Harrach S. Hedicke F.H. Heinsius F. Herrmann 14 C. Heß F. Hinterberger N. Horikawa Ch. Höppner N. Dʼhose 3 S. Huber 15 S. Ishimoto O. Ivanov Yu. Ivanshin T. Iwata 16 R. Jahn P. Jasinski R. Joosten 17 E. Kabuß D. Kang B. Ketzer G.V. Khaustov Yu.A. Khokhlov Yu. Kisselev F. Klein 18 K. Klimaszewski S. Koblitz J.H. Koivuniemi V.N. Kolosov K. Kondo K. Königsmann I. Konorov V.F. Konstantinov A. Korzenev 3 A.M. Kotzinian O. Kouznetsov M. Krämer 19 Z.V. Kroumchtein F. Kunne 3 K. Kurek L. Lauser J.-M. Le Goff 20, 21 A.A. Lednev A. Lehmann 22, 23, 24 S. Levorato J. Lichtenstadt A. Maggiora A. Magnon 3 N. Makke 3 G.K. Mallot A. Mann 25 C. Marchand 3 A. Martin 26 J. Marzec T. Matsuda W. Meyer T. Michigami Yu.V. Mikhailov M.A. Moinester A. Morreale 3 A. Mutter A. Nagaytsev T. Nagel J.P. Nassalski F. Nerling S. Neubert D. Neyret 3 V.I. Nikolaenko W.D. Nowak A.S. Nunes A.G. Olshevsky M. Ostrick A. Padee R. Panknin D. Panzieri B. Parsamyan S. Paul 27 E. Perevalova G. Pesaro D.V. Peshekhonov G. Piragino S. Platchkov 3 J. Pochodzalla J. Polak 28 V.A. Polyakov G. Pontecorvo J. Pretz S.L. Procureur M. Quaresma C. Quintans J.-F. Rajotte S. Ramos 29 V. Rapatsky G. Reicherz A. Richter 30 E. Rocco E. Rondio N.S. Rossiyskaya D.I. Ryabchikov V.D. Samoylenko A. Sandacz M.G. Sapozhnikov S. Sarkar 31 I.A. Savin G. Sbrizzai P. Schiavon C. Schill T. Schlüter K. Schmidt L. Schmitt 32 K. Schönning S. Schopferer M. Schott 33 O.Yu. Shevchenko L. Silva 34 L. Sinha A.N. Sissakian M. Slunecka George Smirnov 35 S. Sosio F. Sozzi A. Srnka M. Stolarski M. Sulc R. Sulej H. Suzuki P. Sznajder S. Takekawa J. ter Wolbeek S. Tessaro F. Tessarotto L.G. Tkatchev S. Uhl I. Uman M. Vandenbroucke 3 M. Virius N.V. Vlassov L. Wang 36 M. Wilfert R. Windmolders W. Wiślicki H. Wollny 3 K. Zaremba M. Zavertyaev E. Zemlyanichkina M. Ziembicki N. Zhuravlev A. Zvyagin
36 MOTIVATE - Imagerie et modélisation Vasculaires, Thoraciques et Cérébrales
CREATIS - Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé : 139739
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 mu(+) beam and a transversely polarised NH3 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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C. Adolph, M.G. Alekseev, V.Yu. Alexakhin, Yu. Alexandrov, G.D. Alexeev, et al.. II - Experimental investigation of transverse spin asymmetries in mu-p SIDIS processes: Sivers asymmetries. Physics Letters B, Elsevier, 2012, 717 (4-5), pp.383. ⟨10.1016/j.physletb.2012.09.056⟩. ⟨hal-01128824⟩

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