W mass and Leptonic Z-decays in the NMSSM

TL;DR

This paper investigates electroweak precision observables related to leptonic Z-decays within the NMSSM, finding that the model aligns well with current experimental data under existing constraints.

Contribution

It provides a detailed analysis of leptonic Z-decay observables in the NMSSM, highlighting its consistency with measurements and exploring effects less discussed in prior models.

Findings

NMSSM is consistent with current measurements of leptonic Z-decays

Analysis of specific NMSSM scenarios under existing constraints

Highlights effects on $ au$ and $e$ decay ratios

Abstract

We study a subset of electroweak-precision observables consisting of $M_W$, $\sin^2\theta_{{\tiny eff}}^{\tau}$, $BR(Z\to\tau^+\tau^-)$ and $\Gamma(Z\to\tau^+\tau^-)/\Gamma(Z\to e^+e^-)-1$ (characterizing leptonic $Z$-decays) in the context of the NMSSM. After a brief review of common MSSM-NMSSM effects, e.g. for $\Gamma(Z\to\tau^+\tau^-)/\Gamma(Z\to e^+e^-)-1$, which has been little discussed, even in the MSSM), specific NMSSM scenarios are studied, with the result that the NMSSM, considering existing constraints on its spectrum, is essentially consistent with available measurements, given the current accuracy.