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

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

2004-08-31

arxiv.org/abs/hep-ph/0409003v1

Phys.Rev. C71 (2005) 014901

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, 16 figures

Scientific paper

10.1103/PhysRevC.71.014901

The transverse-momentum ($Q_T$) distribution of low-mass Drell-Yan pairs is calculated in QCD perturbation theory with all-order resummation of $\alpha_s (\alpha_s \ln(Q^2_T/Q^2))^n$ 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.

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