Next-to-leading-order QCD corrections and parton-shower effects for weakino+squark production at the LHC

TL;DR

This paper calculates next-to-leading-order QCD corrections for weakino+squark production at the LHC, integrating these into a tool that combines fixed-order calculations with parton showers, and demonstrates its effectiveness with specific SUSY scenarios.

Contribution

It introduces a new NLO QCD correction calculation for weakino+squark production, implemented in the POWHEG-BOX framework, including resonance subtraction and decay simulations.

Findings

Perturbative stability confirmed for specific processes.

Distributions of decay products provided with PYTHIA 8.

Implementation enables more accurate collider predictions.

Abstract

We present a calculation of the next-to-leading order QCD corrections to weakino+squark production processes at hadron colliders and their implementation in the framework of the POWHEG-BOX, a tool for the matching of fixed-order perturbative calculations with parton-shower programs. Particular care is taken in the subtraction of on-shell resonances in the real-emission corrections that have to be assigned to production processes of a different type. In order to illustrate the capabilities of our code, representative results are shown for selected SUSY parameter points in the pMSSM11. The perturbative stability of the calculation is assessed for the $ pp \rightarrow \tilde{\chi}^0_1 \tilde{d}_L $ process. For the squark+chargino production process $ pp \rightarrow \tilde{\chi}_1^- \tilde{u}_L $ distributions of the chargino's decay products are provided with the help of the decay feature of PYTHIA 8.