One-loop renormalisation of the NMSSM in SloopS : 1. the neutralino-chargino and sfermion sectors

TL;DR

This paper completes the one-loop renormalisation of the NMSSM, focusing on neutralino-chargino and sfermion sectors, and implements the results in the SloopS code for automated calculations.

Contribution

It provides a detailed renormalisation scheme for the NMSSM's neutralino-chargino and sfermion sectors and integrates these into the SloopS computational framework.

Findings

One-loop corrections to neutralino masses calculated.

Partial widths of neutralinos and charginos into gauge bosons computed.

Electroweak and QCD corrections to third-generation sfermion decays obtained.

Abstract

We have completed the one-loop renormalisation of the Next-to-Minimal Supersymmetric Standard Model (NMSSM) allowing for and comparing between different renormalisation schemes. A special attention is paid to on-shell schemes. We study a variety of these schemes based on alternative choices of the physical input parameters. In this paper we present our approach to the renormalisation of the NMSSM and report on our results for the neutralino-chargino and sfermion sectors. We will borrow some results from our study of the Higgs sector whose full discussion is left for a separate publication. We have implemented the set up for all the sectors of the NMSSM within \sloops, a code for the automatic computation of one-loop corrections initially developed for the standard model and the MSSM. Among the many applications that allows the code, we present here the one-loop corrections to neutralino masses and to partial widths of neutralinos and charginos into final states with one gauge boson. One-loop electroweak and QCD corrections to the partial widths of third generation sfermions into a fermion and a chargino or a neutralino are also computed.