2013/06/30 by B. Parsamyan, Parsamyan, Bakur
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Superconducting Materials and Applications
paper · pdf · doi:10.48550/arxiv.1307.0183
openalex publication_date 2013/06/30 · openalex created_date 2022/08/13 · openalex updated_date 2026/07/28
One of the important objectives of the COMPASS experiment (SPS, CERN)\n citeAbbon:2007pq is the exploration of the transverse spin structure of the\nnucleon via spin dependent azimuthal asymmetries in single-hadron production in\ndeep inelastic scattering of polarized leptons off transversely polarized\ntargets. For this purpose a series of measurements were made in COMPASS, using\n160 GeV/c longitudinally polarized muon beam and transversely polarized 6LiD\n(in 2002, 2003 and 2004) and NH3 (in 2007 and 2010) targets.\n In the past few years considerable theoretical interest and experimental\nefforts were focused on the study of Collins and Sivers transverse spin\nasymmetries. The experimental results obtained so far play an important role in\nthe general understanding of the three-dimensional nature of the nucleon in\nterms of transverse momentum dependent parton distribution functions.\n In addition to these two measured leading-twist effects, the SIDIS\ncross-section includes six more target transverse spin dependent azimuthal\nasymmetries, which have their own well defined leading or higher-twist\ninterpretation in terms of QCD parton model.\n COMPASS preliminary results for these six "beyond Collins and Sivers"\nasymmetries, obtained from transversely polarized deuteron and proton data have\nbeen presented at the previous conferences citeParsamyan:2007ju -\n citeParsamyan:2013ug. In this review we focus on the results obtained with\nthe last "proton-2010" data sample.\n