Probing small-$x$ gluons by low-mass Drell-Yan pairs at colliders

Abstract

The transverse-momentum ($Q_T$) distribution of low-mass Drell-Yan pairs is calculated in QCD perturbation theory with all-order resummation of ${\alpha }_s({\alpha }_s\ln (Q_T^2/Q^2){)}^n$ type terms. We demonstrate that the rapidity distribution of low-mass Drell-Yan pairs at large-enough transverse momentum is an advantageous source of constraints on the gluon distribution and its nuclear dependence. We argue that low-mass Drell-Yan pairs in the forward region provide a good and clean probe of small-$x$ gluons at collider energies.

arXiv comment25 pages, 16 figures

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Cited by in corpus (5)

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• Measurements of $\mu \mu$ pairs from open heavy flavor and Drell-Yan in $p+p$ collisions at $\sqrt{s}=200$ GeV
• Measuring gluon shadowing with prompt photons at RHIC and LHC
• Drell-Yan as a probe of small x partons at the LHC
• Inclusive and exclusive diffractive production of dilepton pairs in proton-proton collisions at high energies