Volume 314 - The European Physical Society Conference on High Energy Physics (EPS-HEP2017) - QCD and Hadronic Physics (Parallel Session). Conveners: Ulla Blumenschein; Kostas Kousouris; Maria Ubiali. Scientific Secretary: Pierpaolo Mastrolia
COMPASS Measurements of Asymmetry Amplitudes in the Drell-Yan Process Observed from Scattering Pions off a Transversely Polarized Proton Target
R. Heitz*  on behalf of the COMPASS Collaboration
*: corresponding author
Full text: pdf
Pre-published on: January 14, 2018
Published on: March 20, 2018
Abstract
In 2015 the COMPASS collaboration at CERN studied the Drell-Yan
process with a 190 GeV/c π− beam on a transversely polarized
NH3 target. From single-spin asymmetries COMPASS was able to
determine amplitudes related to the proton Sivers, transversity and
prezelosity transverse momentum dependent (TMD) distributions. The most
notable of these TMDs is the semi-universal Sivers function which is theorized
to change sign between the Drell-Yan and semi-inclusive deep inelastic
scattering (SIDIS) processes. COMPASS has previously measured a non-zero
Sivers amplitude from SIDIS and therefore it offers a unique opportunity,
with a similar experimental setup and kinematic domain, to definitely conclude
on the sign change between the Drell-Yan and SIDIS processes. The
analysis and results of the 2015 Drell-Yan COMPASS data are presented.
DOI: https://doi.org/10.22323/1.314.0379
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