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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
W.C. Chang,* R.E. McClellan", J.C. Peng, O. Teryaev
*corresponding author
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Pre-published on: 2019 July 12
Published on: 2019 October 04
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.
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