Implementation of electroweak corrections in the POWHEG BOX: single W production

Luca Barzè,Oreste Nicrosini,Fulvio Piccinini,Guido Montagna,Paolo Nason

doi:10.1007/jhep04(2012)037

Abstract

Abstract We present a fully consistent implementation of electroweak and strong radiative corrections to single W hadroproduction in the POWHEG BOX framework, treating soft and collinear photon emissions on the same ground as coloured parton emissions. This framework can be easily extended to more complex electroweak processes. We describe how next-to-leading order (NLO) electroweak corrections are combined with the NLO QCD calculation, and show how they are interfaced to QCD and QED shower Monte Carlo. The resulting tool fills a gap in the literature and allows to study comprehensively the interplay of QCD and electroweak effects to W production using a single computational framework. Numerical comparisons with the predictions of the electroweak generator HORACE, as well as with existing results on the combination of electroweak and QCD corrections to W production, are shown for the LHC energies, to validate the reliability and accuracy of the approach.

Highlights

The determination of the measurement error of the total cross sections, as well as of the other observables of experimental interest
We present a fully consistent implementation of electroweak and strong radiative corrections to single W hadroproduction in the POWHEG BOX framework, treating soft and collinear photon emissions on the same ground as coloured parton emissions
We describe how next-to-leading order (NLO) electroweak corrections are combined with the NLO QCD calculation, and show how they are interfaced to QCD and QED shower Monte Carlo

Summary

Introduction

The determination of the measurement error of the total cross sections, as well as of the other observables of experimental interest. In the high energy regions of the phase space, where the searches for new physics beyond the SM are focused, the CC DY is the main background to unravel signatures due to the presence of heavy charged bosons predicted by many extensions of the SM In these high energy tails, the electroweak (EW) loop diagrams containing the exchange of massive gauge bosons give rise to large contributions to the experimental observables, because of the presence of EW Sudakov logarithms ∝ log2(s/MV2 ), log(s/MV2 ), where sis the squared partonic center of mass (c.m.) energy and MV , V = W, Z the gauge boson mass. The NNLO pQCD computation of DY observables in a fully differential form was completed only in recent years by two independent groups [3,4,5]

Objectives

Methods

Conclusion