Oblique Corrections in the MSSM at One Loop. II. Fermions

TL;DR

This paper completes the calculation of one-loop oblique corrections in the MSSM, focusing on fermion superpartners and using a novel two-component spinor formalism to derive contributions to electroweak gauge boson self-energies.

Contribution

It introduces a new two-component spinor formalism for calculating oblique corrections in the MSSM and provides detailed fermionic sector contributions to the S, T, and U parameters.

Findings

Calculated fermion superpartner contributions to gauge boson self-energies.

Validated results through two independent methods.

Analyzed implications for electroweak precision tests.

Abstract

This paper is the completion of an earlier work arXiv:1207.4867 which involves the derivation of oblique corrections in the MSSM at one loop. In terms of the two-component spinor formalism, which is new in compared with those used in the literature, the contributions arising from the fermion superpartners i.e, neutralino-chargino sector to self-energy of standard model electroweak gauge bosons are calculated. Corresponding descendants the $S$, $T$ and $U$ parameters are presented. The validity of our results is examined in two ways, which are then followed by detailed analysis on the results in the literature.