2011/03/10 by M. Boglione, S. Melis · 5 citations
Physics and Astronomy · #Deep inelastic scattering #Distribution function #Drell–Yan process #Factorization #Hadron #Helicity #High-Energy Particle Collisions Research #Inelastic scattering #Invariant mass #Particle physics #Particle physics theoretical and experimental studies #Parton #Perturbative QCD #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Rest frame #Scattering #hep-ph
paper · pdf · doi:10.1103/physrevd.84.034038
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 84(3) (American Physical Society)
arxiv created 2011/03/10 · openalex publication_date 2011/08/24 · arxiv updated 2011/09/15 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present a decomposition of the hadronic tensor for a general polarized Drell-Yan process AB\ensuremath→\ensuremathℓ+\ensuremathℓ^\ensuremath-X in terms of helicity structure functions using the helicity axes of the dilepton rest frame as a basis. Next, we consider a QCD parton model in the framework of a generalized QCD factorization scheme, which applies when the dilepton invariant mass M is much larger than the transverse component of the photon momentum, qT, in the hadronic center of mass frame. In this approximation we compute the angular distribution of the unpolarized Drell-Yan cross section and of the Sivers effect, in single polarized Drell-Yan scattering, by taking into account the transverse motion of partons inside the initial hadrons, k_\ensuremath⊥. Interesting and simple results are found in the kinematical region k_\ensuremath⊥\ensuremath≃qT\ensuremath≪M, to first order in a qT/M expansion. Finally, explicit analytical expressions, convenient for phenomenological studies, are obtained assuming a factorized Gaussian dependence on intrinsic momenta for the unpolarized and Sivers distribution functions, in analogy to those obtained for semi-inclusive deep inelastic scattering.