The lepton angular distributions of the Drell-Yan process in
the fixed-target experiments are investigated by NLO and NNLO
perturbative QCD. We present the calculated angular parameters
$\lambda$, $\mu$, $\nu$ and the degree of violation of the Lam-Tung
relation, $1-\lambda-2\nu$, for the E615 experiment as well as
predictions for the COMPASS experiment. Many salient features of
transverse momentum and rapidity dependence could be qualitatively
understood by a geometric approach.
Volume 352 -
XXVII International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2019) -
Working Group 6: Spin and 3D Structure
Lepton angular distributions of Drell-Yan process in pQCD and a geometric approach
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Pre-published on:
July 12, 2019
Published on:
October 04, 2019
Abstract
DOI: https://doi.org/10.22323/1.352.0172
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.