Gluino Decays in the Complex MSSM: A Full One-Loop Analysis

TL;DR

This paper provides a comprehensive one-loop calculation of gluino decay modes in the complex MSSM, highlighting significant corrections essential for accurate LHC phenomenology.

Contribution

It presents the first full one-loop analysis of all gluino two-body decays in the cMSSM, including QED and QCD radiation effects.

Findings

Decay widths and branching ratios can differ by up to 10% from simpler approximations.

Full one-loop corrections are crucial for precise interpretation of gluino decays at the LHC.

Results will be integrated into the FeynHiggs code for broader use.

Abstract

We evaluate all two-body decay modes of the gluino, in the Minimal Supersymmetric Standard Model with complex parameters (cMSSM). This constitutes an important step in the cascade decays of SUSY particles at the LHC. The evaluation is based on a full one-loop calculation of all two-body decay channels, also including hard QED and QCD radiation. The dependence of the gluino decay to a scalar quark and a quark on the relevant cMSSM parameters is analyzed numerically. We find sizable contributions to the decay widths and branching ratios. They are, roughly of O(5%), but can go up to +-10% or higher, where the pure SUSY QCD contributions alone can give an insufficient approximation to the full one-loop result. Therefore the full corrections are important for the correct interpretation of gluino decays at the LHC. The results will be implemented into the Fortran code FeynHiggs.