2018/01/04 by B. Parsamyan, Parsamyan, Bakur
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.1801.01488
openalex publication_date 2018/01/04 · openalex created_date 2022/10/03 · openalex updated_date 2026/07/28
Preliminary results obtained by the COMPASS experiment for\nlongitudinal-spin-dependent azimuthal asymmetries in single-hadron\nmuoproduction off protons are presented for the first time. The analysis was\ncarried out on the full data sample collected by COMPASS with longitudinally\npolarized proton (NH3) target in 2007 and 2011 using 160~ gvc and 200~ gvc\nmuon beams, correspondingly. Within QCD parton model approach extracted\nasymmetries are giving access to the specific convolutions of certain\ntransverse-momentum-dependent \twist-2 and \higher twist parton\ndistribution functions and fragmentation functions. In order to access\ndifferent features of the involved distributions, the asymmetries are extracted\nas functions of different kinematic variables for both positive and negative\nsingle-hadron productions. The significant amount of collected data and wide\nkinematic range give unique importance to the results. Obtained asymmetries are\ncompared with previous measurements performed by HERMES experiment and with\navailable model predictions.\n