Electroweakino pair production at the LHC: NLO SUSY-QCD corrections and parton-shower effects

TL;DR

This paper introduces NLO SUSY-QCD calculations for electroweakino pair production at the LHC, incorporating parton-shower effects, and provides a computational tool for accurate phenomenological studies.

Contribution

It develops a new NLO SUSY-QCD computational framework with parton-shower matching for electroweakino production, enabling precise simulations with a SUSY Les Houches Accord interface.

Findings

NLO-QCD corrections significantly increase production rates.

Parton-shower effects have a small impact on weakino distributions.

Jet distributions are notably affected by parton-shower effects.

Abstract

We present a set of NLO SUSY-QCD calculations for the pair production of neutralinos and charginos at the LHC, and their matching to parton-shower programs in the framework of the POWHEG-BOX program package. The code we have developed provides a SUSY Les Houches Accord interface for setting supersymmetric input parameters. Decays of the neutralinos and charginos and parton-shower effects can be simulated with PYTHIA. To illustrate the capabilities of our program, we present phenomenological results for a representative SUSY parameter point. We find that NLO-QCD corrections increase the production rates for neutralinos and charginos significantly. The impact of parton-shower effects on distributions of the weakinos is small, but non-negligible for jet distributions.