Sivers asymmetry extracted in SIDIS at the hard scales of the Drell–Yan process at COMPASS

C Adolph , M Aghasyan , R Akhunzyanov , M G Alexeev , G D Alexeev , A Amoroso , V Andrieux (1) , N V Anfimov , V Anosov , K Augsten , W Augustyniak , A Austregesilo , C D R Azevedo , B Badełek , F Balestra , M Ball , J Barth , R Beck , Y Bedfer (1) , J Bernhard , K Bicker , E R Bielert , R Birsa , M Bodlak , P Bordalo , F Bradamante , C Braun , A Bressan , M Buchele , W-C Chang , C Chatterjee , M Chiosso , I Choi , S-U Chung , A Cicuttin , M L Crespo , Q Curiel (1) , S Dalla Torre , S S Dasgupta , O Yu Denisov , L Dhara , S V Donskov , N Doshita , Ch Dreisbach , V Duic , W Dünnweber , M Dziewiecki , A Efremov , P D Eversheim , W Eyrich , M Faessler , A Ferrero (1) , M. Finger , H Fischer , C Franco , N Du Fresne von Hohenesche , J M Friedrich , V Frolov , E Fuchey (1) , F Gautheron , O P Gavrichtchouk , S Gerassimov , J Giarra , F Giordano , I Gnesi , M Gorzellik , S Grabmuller , A Grasso , M Grosse Perdekamp , B Grube , T Grussenmeyer , A Guskov , F Haas , D Hahne , G Hamar , D von Harrach , F H Heinsius , R Heitz , F Herrmann , N Horikawa , N d'Hose (1) , C-y Hsieh , S Huber , S Ishimoto , A Ivanov , Yu Ivanshin , T Iwata , V Jary , R Joosten , P Jorg , E Kabuss , B Ketzer , G V Khaustov , Yu A Khokhlov , Yu Kisselev , F Klein , K Klimaszewski , J H Koivuniemi , V N Kolosov , K Kondo , K Konigsmann , I Konorov , V F Konstantinov , a M Kotzinian , O M Kouznetsov , M Kramer , P Kremser , F Krinner , Z V Kroumchtein , Y Kulinich , F Kunne (1) , K Kurek , R P Kurjata , a A Lednev , A Lehmann , M Levillain (1) , S Levorato , Y-S Lian , J Lichtenstadt , R Longo , A Maggiora , A Magnon (1) , N Makins , N Makke , G K Mallot , B Marianski , A Martin , J Marzec , J Matousek , H Matsuda , T Matsuda , G V Meshcheryakov , M Meyer (1) , W Meyer , Yu V Mikhailov , M Mikhasenko , E Mitrofanov , N Mitrofanov , Y Miyachi , A Nagaytsev , F Nerling , D Neyret (1) , J Novy , W-D Nowak , G Nukazuka , a S Nunes , a G Olshevsky , I Orlov , M Ostrick , D Panzieri , B Parsamyan , S Paul , J-C Peng , F Pereira , M Pesek , D V Peshekhonov , N Pierre (1) , S Platchkov (1) , J Pochodzalla , V A Polyakov , J Pretz , M Quaresma , C Quintans , S Ramos , C Regali , G Reicherz , C Riedl , M Roskot , N S Rossiyskaya , D I Ryabchikov , A Rybnikov , A Rychter , R Salac , V D Samoylenko , A Sandacz , C Santos , S Sarkar , I A Savin , T Sawada , G Sbrizzai , P Schiavon , K Schmidt , H Schmieden , K Schonning , E Seder (1) , A Selyunin , L Silva , L Sinha , S Sirtl , M Slunecka , J Smolik , A Srnka , D Steffen , M Stolarski , O Subrt , M Sulc , H Suzuki , A Szabelski , T Szameitat , P Sznajder , S Takekawa , M Tasevsky , S Tessaro , F Tessarotto , F Thibaud (1) , A Thiel , F Tosello , V Tskhay , S Uhl , J Veloso , M Virius , J Vondra , S Wallner , T Weisrock , M Wilfert , J ter Wolbeek , K Zaremba , P Zavada , M Zavertyaev , E Zemlyanichkina , N Zhuravlev , M Ziembicki , A Zink

1 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers

Eight proton transverse-spin-dependent azimuthal asymmetries are extracted in four regions of the photon virtuality Q2 from the COMPASS 2010 semi-inclusive hadron measurements in deep inelastic muon–nucleon scattering. These Q2 regions correspond to the four regions of the di-muon mass Q2 used in the ongoing analyses of the COMPASS Drell–Yan measurements, which allows for a future direct comparison of the nucleon transverse-momentum-dependent parton distribution functions extracted from these two alternative measurements. In addition, for the azimuthal asymmetries induced by the Sivers transverse-momentum-dependent parton distribution function various two-dimensional kinematic dependences are presented. The integrated Sivers asymmetries are found to be positive with an accuracy that appears to be sufficient to test the sign change of the Sivers function predicted by Quantum Chromodynamics.

Mots clés: SIDIS; Drell–Yan; Spin; Azimuthal asymmetries; Sivers; TMDs; muon+ p: deep inelastic scattering; polarized beam: longitudinal; parton: distribution function; angular distribution: asymmetry; deep inelastic scattering: semi-inclusive reaction; muon nucleon: deep inelastic scattering; muon nucleon: scattering; polarized target: transverse; dimension: 2; Sivers function; spin: asymmetry; COMPASS; CERN SPS; transverse momentum dependence; Drell-Yan process; quantum chromodynamics; kinematics; nucleon: transverse momentum; photon; experimental results; 160 GeV/c

Domaines: Physique des Hautes Energies - Expérience [hep-ex]; Physique des Hautes Energies - Phénoménologie [hep-ph]

C Adolph, M Aghasyan, R Akhunzyanov, M G Alexeev, G D Alexeev, et al.. Sivers asymmetry extracted in SIDIS at the hard scales of the Drell–Yan process at COMPASS. Phys.Lett.B, 2017, 770, pp.138-145. ⟨10.1016/j.physletb.2017.04.042⟩. ⟨hal-01554653⟩