I - Experimental investigation of transverse spin asymmetries in mu-p SIDIS processes: Collins 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 Collins asymmetry of the proton was extracted in the Bjorken x range 0.003 < x < 0.7. These new precise measurements confirm previous measurements from the COMPASS and HERMES Collaborations, which exhibit a definite effect in the valence quark region. The asymmetries for negative and positive hadrons are similar in magnitude and opposite in sign. They are compatible with model calculations in which the u-quark transversity is opposite in sign and somewhat larger than the d-quark transversity distribution function. The asymmetry is extracted as a function of Bjorken x, the relative hadron energy z and the hadron transverse momentum p(T)(h). The high statistics and quality of the data also allow for more detailed investigations of the dependence on the kinematic variables. These studies confirm the leading-twist nature of the Collins asymmetry.
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C. Adolph, M.G. Alekseev, V.Yu. Alexakhin, Yu. Alexandrov, G.D. Alexeev, et al.. I - Experimental investigation of transverse spin asymmetries in mu-p SIDIS processes: Collins asymmetries. Physics Letters B, Elsevier, 2012, 717 (4-5), pp.376. ⟨hal-01128815⟩

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