Probing small-x gluons by low-mass Drell-Yan pairs at RHIC and LHC
  We calculate the transverse momentum distribution of low-mass Drell-Yan pairs in QCD perturbation theory with all-order resummation. We demonstrate that the transverse momentum distribution of low-mass Drell-Yan pairs is an advantageous source of constraints on the gluon distribution and its nuclear dependence. With the reduction in background, we argue that low-mass Drell-Yan pairs in the forward region provide a good and clean probe of small-x gluons at RHIC and LHC. 
George Fai (Kent State University), Jianwei Qiu (Iowa State   University), and Xiaofei Zhang (Kent State University)