Nonperturbative contributions to a resummed leptonic angular distribution in inclusive $Z/{\gamma }^{\ast }$ boson production

Abstract

We summarize a new analysis of the distribution ${\varphi }_{\eta }^{\ast }$ of charged leptons produced in decays of $Z$ and ${\gamma }^{\ast }$ bosons in the Collins-Soper-Sterman (CSS) formalism for transverse momentum resummation. By comparing the ${\varphi }_{\eta }^{\ast }$ distribution measured at the Tevatron with the resummed CSS cross section with approximate $\mathcal{O}({\alpha }_s^2)$ Wilson coefficients, we constrain the magnitude of the nonperturbative Gaussian smearing factor and analyze its uncertainty caused by variations in scale parameters. We find excellent agreement between the ${\varphi }_{\eta }^{\ast }$ data and our theoretical prediction, provided by the \textsc{ResBos} resummation program. The nonperturbative factor that we obtained can be used to update resummed QCD predictions for precision measurements in inclusive $W$ and $Z$ production and for comparisons to various models of nonperturbative dynamics.

8 pages, 3 figures. Presented at conference: "The QCD Evolution Workshop", May 14-17 2012, Thomas Jefferson National Accelerator Facility, Newport News, VA

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• The CT10 NNLO Global Analysis of QCD
• Measurement of the transverse momentum and ${\varphi }_{\eta }^{\ast }$ distributions of Drell-Yan lepton pairs in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Nonperturbative contributions to a resummed leptonic angular distribution in inclusive neutral vector boson production
• Massive neutral gauge boson production as a probe of nuclear modifications of parton distributions at the LHC
• QCD Evolution Workshop: Introduction