Speaker
Dr
Bakur Parsamyan
(University of Turin and INFN)
Description
The COMPASS experiment (SPS, CERN) covers a broad range of physics aspects in the field of hadron structure and spectroscopy. Particular focus is given to the exploration of the transverse spin structure of the nucleon via the study of spin (in)dependent azimuthal asymmetries measured in semi-inclusive deep inelastic scattering (SIDIS) and Drell-Yan (DY). Within QCD parton model approach, these phenomena give access to the set of transverse momentum dependent (TMD) parton distribution functions (PDFs) parametrizing the spin structure of the nucleon.
Between 2002 and 2010 COMPASS performed series of SIDIS measurements, using a longitudinally polarized muon beam of 160 GeV/c momentum and transversely polarized $^6LiD$ and $NH_3$ targets. First COMPASS Drell-Yan measurements with a 190 GeV/c pion beam and transversely polarized $NH_3$ target have been taken in 2015 and will be continued in 2018. The measurement of the Sivers and all other azimuthal asymmetries in polarized SIDIS and Drell-Yan at COMPASS provides a unique possibility to test predicted in QCD universal and process-dependent features of TMD PDFs using essentially the same experimental setup and exploring a comparable kinematic domain.
In this talk recent COMPASS SIDIS results and important aspects of Drell-Yan measurements will be reviewed together with the results from relevant theoretical calculations.
Primary author
Dr
Bakur Parsamyan
(University of Turin and INFN)
