The Drell-Yan process with pions and polarized nucleons

Abstract

The Drell-Yan process provides important information on the internal structure of hadrons including transverse momentum dependent parton distribution functions (TMDs). In this work we present calculations for all leading twist structure functions describing the pion induced Drell-Yan process. The non-perturbative input for the TMDs is taken from the light-front constituent quark model, the spectator model, and available parametrizations of TMDs extracted from the experimental data. TMD evolution is implemented at Next-to-Leading Logarithmic precision for the first time for all asymmetries. Our results are compatible with the first experimental information, help to interpret the data from ongoing experiments, and will allow one to quantitatively assess the models in future when more precise data will become available.

arXiv commentThe paper is restructured with new discussions and results, TMD evolution is implemented at Next-to-Leading Logarithmic accuracy for all asymmetries. 27 pages and 10 figures

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• The valence quark, sea, and gluon content of the pion from the parton distribution functions and the electromagnetic form factor
• Combining nonperturbative transverse momentum dependence with TMD evolution
• Study of worm-gear-T function $g_{1T}$ with semi-inclusive DIS data
• The resolution to the problem of consistent large transverse momentum in TMDs