Electroweak corrections to Neutralino and Chargino decays into a W-boson in the (N)MSSM

TL;DR

This paper calculates the complete electroweak one-loop corrections to chargino and neutralino decays into W-bosons within the (N)MSSM, highlighting significant parameter-dependent effects and providing a public computational tool.

Contribution

It provides the first comprehensive electroweak correction calculations for these decays in the (N)MSSM using an on-shell scheme with gauge invariance ensured by the pinch technique.

Findings

Corrections range from 1-10% for higgsino/wino-like states.

Corrections can exceed 50% for bino-like or singlino-like neutralinos.

The public program CNNDecays implements these calculations.

Abstract

We present the complete electroweak one-loop corrections to the partial widths for two-body decays of a chargino (neutralino) into a W-boson and a neutralino (chargino). We perform the calculation for the minimal and the next-to-minimal supersymmetric standard model using an on-shell renormalization scheme. Particular attention is paid to the question of gauge invariance which is achieved using the so-called pinch technique. Furthermore we show that these corrections show a strong parameter dependence and usually are in the range of 1-10 percent if the neutralino involved is a higgsino or wino like state. However, in case of a bino-like or a singlino-like neutralino the corrections can go up to 50% and more. Moreover we present the public program CNNDecays performing these calculations.