Accurate QCD predictions for new variables to study dilepton transverse momentum

Details Accurate QCD predictions for new variables to study dilepton transverse momentum Accurate QCD predictions for new variables to study dilepton transverse momentum

2011-06-30

arxiv.org/abs/1106.6294v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at the XIX International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS 2011), April 11-15, 2011;

Scientific paper

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.

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