Low-mass lepton pair production at large transverse momentum
Low-mass lepton pair production at large transverse momentum
We study the transverse momentum distribution of low-mass lepton pairs produced in hadronic scattering, using the perturbative QCD factorization approach. We argue that the distribution at large transverse momentum, ${Q}_{T}\ensuremath{\gg}Q$, with the pair's invariant mass $Q$ as low as $Q\ensuremath{\sim}{\ensuremath{\Lambda}}_{\mathrm{QCD}}$, can be systematically factorized into universal parton-to-lepton pair fragmentation functions, …