Electroweak Sudakov Corrections to New Physics Searches at the LHC

Mauro Chiesa,Francesco Tramontano,Luca Barzè,Fulvio Piccinini,Mauro Moretti,Oreste Nicrosini,Guido Montagna

doi:10.1103/physrevlett.111.121801

Abstract

We compute the one-loop electroweak Sudakov corrections to the production process Z(νν)+n jets, with n=1, 2, 3, in pp collisions at the LHC. It represents the main irreducible background to new physics searches at the energy frontier. The results are obtained at the leading and next-to-leading logarithmic accuracy by implementing the general algorithm of Denner and Pozzorini in the event generator for multiparton processes alpgen. For the standard selection cuts used by the ATLAS and CMS Collaborations, we show that the Sudakov corrections to the relevant observables can grow up to -40% at sqrt[s ]= 14 TeV. We also include the contribution due to undetected real radiation of massive gauge bosons, to show to what extent the partial cancellation with the large negative virtual corrections takes place in realistic event selections.

Highlights

We compute the one-loop electroweak Sudakov corrections to the production process Zð"Þ þ n jets, with n 1⁄4 1, 2, 3, in pp collisions at the LHC
Important searches for new phenomena beyond the standard model (SM) of particle physics at the proton-proton collider LHC at the CERN laboratory are based on the analysis of events with jets and missing transverse momentum (p6 T)
We considered radiative processes: vector boson pairs plus jets, as enumerated in Table I, in order to give an estimate of the cancellation between virtual next-to-leading order (NLO) and real radiation in the presence of a realistic event selection [35]

Summary

Electroweak Sudakov Corrections to New Physics Searches at the LHC

Mauro Chiesa* and Guido Montagna† Dipartimento di Fisica, Universitadi Pavia, and INFN, Sezione di Pavia, Via A. Mauro Moretti§ Dipartimento di Fisica e Scienze della Terra, Universitadi Ferrara, and INFN, Sezione di Ferrara, Via Saragat 1, 44100 Ferrara, Italy. Oreste Nicrosini∥ and Fulvio Piccinini¶ INFN, Sezione di Pavia, via A.

Francesco Tramontano**

Findings

This work was supported in part by the Research