Low-mass dilepton production in pp and AA collisions Original Research Article

We adopt a factorized QCD formalism to describe the transverse momentum distribution of lowmass lepton pairs produced in pp collisions, when the pair transverse momentum QT4≫Q, with the pairʹs invariant mass Q as low as Q∼ΛQCD. We extend this formalism to dilepton production in AA collisions by including the nuclear-dependent power correction due to parton multiple scattering.