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 D. Chaberny 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 14 D. von Harrach S. Hedicke F.H. Heinsius F. Herrmann 15 C. Heß F. Hinterberger N. Horikawa Ch. Höppner N. Dʼhose 3 S. Huber 16 S. Ishimoto O. Ivanov Yu. Ivanshin T. Iwata 17 R. Jahn P. Jasinski R. Joosten 18 E. Kabuß D. Kang B. Ketzer G.V. Khaustov Yu.A. Khokhlov Yu. Kisselev F. Klein 19 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 20 Z.V. Kroumchtein F. Kunne 3 K. Kurek L. Lauser J.-M. Le Goff 21, 22 A.A. Lednev A. Lehmann 23, 24, 25 S. Levorato J. Lichtenstadt A. Maggiora A. Magnon 3 N. Makke 3 G.K. Mallot A. Mann 26 C. Marchand 3 A. Martin 27 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 28 E. Perevalova G. Pesaro D.V. Peshekhonov G. Piragino S. Platchkov 3 J. Pochodzalla J. Polak 29 V.A. Polyakov G. Pontecorvo J. Pretz S.L. Procureur M. Quaresma C. Quintans J.-F. Rajotte S. Ramos 30 V. Rapatsky G. Reicherz A. Richter 31 E. Rocco E. Rondio N.S. Rossiyskaya D.I. Ryabchikov V.D. Samoylenko A. Sandacz M.G. Sapozhnikov S. Sarkar 32 I.A. Savin G. Sbrizzai P. Schiavon C. Schill T. Schlüter K. Schmidt L. Schmitt 33 K. Schönning S. Schopferer M. Schott 34 O.Yu. Shevchenko L. Silva 35 L. Sinha A.N. Sissakian M. Slunecka George Smirnov 36 S. Sosio F. Sozzi A. Srnka M. Stolarski M. Sulc R. Sulej 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 37 R. Windmolders W. Wiślicki H. Wollny 3 K. Zaremba M. Zavertyaev E. Zemlyanichkina M. Ziembicki N. Zhuravlev A. Zvyagin
37 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. ⟨hal-01128824⟩

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