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

Author
Adolph C. Institute of Physics, University of Erlangen Nuremberg
Finger Miroslav, prof. Ing. DrSc. Faculty of Mathematics and Physics, Charles University in Prague
Finger Michael, M.Sc. CSc. Faculty of Mathematics and Physics, Charles University in Prague, JINR Dubna
Slunečka Miloš, Ing. Faculty of Mathematics and Physics, Charles University in Prague, JINR Dubna
Smolík Jan, Mgr. Ph.D. Faculty of Nuclear Sciences and Physical Engineering CTU
Taševský  Marek, Mgr. Ph.D. Institute of Physics ASCR
et al.  different institutions

Year
2017

Scientific journal
Physics Letters B, 770, 138-145

Web


Abstract
Eight proton transverse-spin-dependent azimuthal asymmetries are extracted in four regions of the photon virtuality Q(2) from the COMPASS 2010 semi-inclusive hadron measurements in deep inelastic muon nucleon scattering. These Q(2) regions correspond to the four regions of the di-muon mass root Q(2) 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 accutacy that appears to be sufficient to test the sign change of the Sivers function predicted by Quantum Chromodynamics. (C) 2017 The Authors. Published by Elsevier B.V.

Cite article as:
C. Adolph, M. Finger, M. Finger, M. Slunečka, J. Smolík, M. Taševský , . et al., "Sivers asymmetry extracted in SIDIS at the hard scales of the Drell-Yan process at COMPASS", Physics Letters B, 770, 138-145 (2017)