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A study of initial-state gluon radiation (ISR) in hadron collisions ispresented using Drell-Yan (DY) events produced in proton-antiproton collisionsby the Tevatron collider at a center-of-mass energy of 1.96 TeV. This paperadopts a novel approach which uses the mean value of the Z/$\gamma^*$transverse momentum $<p_T^{DY}>$ in DY events as a powerful observable tocharacterize the effect of ISR. In a data sample corresponding to an integratedluminosity of 9.4 fb$^{-1}$ collected with the CDF Run II detector,$<p_T^{DY}>$ is measured as a function of the Z/$\gamma^*$ invariant mass. Itis found that these two observables have a dependence, $<p_T^{DY}> = -8 + 2.2\ln m_{DY}^2$ [GeV/c], where $m_{DY}$ is the value of the Z/$\gamma^*$ massmeasured in units of GeV/$c^2$. This linear dependence is observed for thefirst time in this analysis. It may be exploited to model the effect of ISR andconstrain its impact in other processes.

A novel measurement of initial-state gluon radiation in hadron collisions using Drell-Yan events