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We study the transverse momentum spectrum of dilepton produced in theunpolarized $\pi^- N$ Drell-Yan process, using transverse momentum dependentfactorization up to next-to-logarithmic order of QCD. We extract thenonperturbative Sudakov form factor for the pion in the evolution formalism ofthe unpolarized TMD distribution function, by fitting the experimental datacollected by the E615 Collaboration at Fermilab. With the extracted Sudakovfactor, we calculate the normalized differential cross section with respect totransverse momentum of the dimuon and compare it with the recent measurement bythe COMPASS Collaboration.

Transverse momentum spectrum of dilepton pair in the unpolarized $\pi^-N$ Drell-Yan process within TMD factorization