Slepton pair production in association with a jet: NLO-QCD corrections and parton-shower effects

Barbara Jäger,Andreas Von Manteuffel,Stephan Thier

doi:10.1007/jhep02(2015)041

Abstract

We present a calculation of the next-to-leading order QCD corrections to slepton pair production in association with a jet at the LHC together with their implementation in the POWHEG BOX. For the simulation of parton-shower effects and the decays of the sleptons we employ the multi-purpose Monte-Carlo program PYTHIA. We discuss the impact of next-to-leading order QCD corrections on experimentally accessible distributions and illustrate how the parton shower can modify observables that are sensitive to QCD radiation effects. Having full control on the hard jet in the process, we provide precise predictions also for monojet analyses.

Highlights

Technical details of the calculationOur calculation of the NLO-(S)QCD corrections to slepton pair production in association with a jet proceeds along similar lines as our previous calculation [20] for slepton pair production at the LHC in the framework of the MSSM
LHC, are to be described realistically, the hard-scattering amplitudes themselves have to account for these jets
We present a calculation of the next-to-leading order QCD corrections to slepton pair production in association with a jet at the LHC together with their implementation in the POWHEG BOX

Summary

Technical details of the calculation

Our calculation of the NLO-(S)QCD corrections to slepton pair production in association with a jet proceeds along similar lines as our previous calculation [20] for slepton pair production at the LHC in the framework of the MSSM. For diagrams with Drell-Yan plus jet like structure, we apply the decomposition of the process q + q → γ∗/Z∗ + g into Lorentz structures, which we employed for the real-emission contributions to slepton pair production in ref. Since our setup encapsulates the (renormalized) loop contributions in scalar coefficient functions which are independent of the decay of the photon or Z boson, this comparison provides a very direct check on our calculation of the virtual corrections and their implementation in the POWHEG BOX. This provides a powerful test on the phase space integration and the overall normalization of the new code

Phenomenological results and discussion

Summary and conclusions