444 research outputs found
Drell-Yan process in TMD factorization
This article presents the review of the current understanding on the
pion-nucleon Drell-Yan process from the point of view of the TMD factorization.
Using the evolution formalism for the unpolarized and polarized TMD
distributions developed recently, we provide the theoretical expression of the
relevant physical observables, namely, the unpolarized cross section, the
Sivers asymmetry, and the asymmetry contributed by the double
Boer-Mulders effects. The corresponding phenomenology, particularly at the
kinematical configuration of the COMPASS Drell-Yan facility, is
displayed numerically.Comment: Version published in Advances in High Energy Physic
Transverse momentum spectrum of dilepton pair in the unpolarized Drell-Yan process within TMD factorization
We study the transverse momentum spectrum of dilepton produced in the
unpolarized Drell-Yan process, using transverse momentum dependent
factorization up to next-to-logarithmic order of QCD. We extract the
nonperturbative Sudakov form factor for the pion in the evolution formalism of
the unpolarized TMD distribution function, by fitting the experimental data
collected by the E615 Collaboration at Fermilab. With the extracted Sudakov
factor, we calculate the normalized differential cross section with respect to
transverse momentum of the dimuon and compare it with the recent measurement by
the COMPASS Collaboration.Comment: 17 pages, 3 figure
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