We report on the computation of the angle-between-leptons distribution in Drell-Yan processes. More precisely we study the recently introduced variable phi*, which provides us with a more accurate probe of the low Q_T domain of Z boson production at hadron colliders. Our theoretical prediction is obtained by matching a next-to-next-to leading logarithmic (NNLL) resummation to a fixed order calculation at next-to-leading order (NLO). We find that the result significantly differs from a pure fixed order calculation in a wide range of the observable we are interested in, clearly indicating the need for resummation. We also perform a first comparison to the measurement by the D0 collaboration, finding good agreement between theory and experiment.
@article{arxiv.1106.6294,
title = {Accurate QCD predictions for new variables to study dilepton transverse momentum},
author = {Simone Marzani and Andrea Banfi and Mrinal Dasgupta and Lee Tomlinson},
journal= {arXiv preprint arXiv:1106.6294},
year = {2011}
}
Comments
Talk given at the XIX International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS 2011), April 11-15, 2011; Newport News, Virginia, USA