Low-mass lepton pair production at large transverse momentum

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dc.creatorKang, Zhong-Bo
dc.creatorQiu, Jian-Wei
dc.creatorVogelsang, Werner
dc.date2008-11-22
dc.date2009-02-20
dc.date.accessioned2026-07-07T12:55:19Z
dc.date.available2026-07-07T12:55:19Z
dc.descriptionWe 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, $Q_T \gg Q$, with the pair's invariant mass $Q$ as low as $Q \sim Λ_{\mathrm{QCD}}$, can be systematically factorized into universal parton-to-lepton pair fragmentation functions, parton distributions, and perturbatively calculable partonic hard parts evaluated at a short distance scale $\sim {\cal O}(1/Q_T)$. We introduce a model for the input lepton pair fragmentation functions at a scale $μ_0\sim 1$ GeV, which are then evolved perturbatively to scales relevant at RHIC. Using the evolved fragmentation functions, we calculate the transverse momentum distributions in hadron-hadron, hadron-nucleus, and nucleus-nucleus collisions at RHIC. We also discuss the sensitivity of the transverse momentum distribution of low-mass lepton pairs to the gluon distribution.
dc.description16 pages, 11 figures, revised version to appear in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/0811.3662
dc.identifierhttp://arxiv.org/abs/0811.3662
dc.identifierPhys.Rev.D79:054007,2009
dc.identifierdoi:10.1103/PhysRevD.79.054007
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/224214
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectNuclear Theory
dc.titleLow-mass lepton pair production at large transverse momentum
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