Higgs sector in NMSSM with right-handed neutrinos and spontaneous R-parity violation

TL;DR

This paper explores a variant of the NMSSM with right-handed neutrinos and spontaneous R-parity violation, analyzing its impact on Higgs phenomenology, including mass predictions and decay modes, consistent with experimental constraints.

Contribution

It introduces a model with spontaneous R-parity violation in NMSSM featuring right-handed neutrinos, highlighting its effects on Higgs properties and particle spectra.

Findings

Light sneutrino can raise Higgs mass to observed value

Lighter stop masses are compatible with experimental data

Higgs decay rates show universal suppression due to scalar mixing

Abstract

R-parity violation modifies the phenomenology of supersymmetric models considerably. We study a version of NMSSM, which contains right-handed neutrinos and in which spontaneous R-parity violation is possible. We study the ensuing effects of spontaneous breaking to the Higgs decay modes, taking into account the measured mass of the Higgs boson and experimental constraints, including rare decays. We find that a possible light scalar, dominantly a sneutrino, helps to increase the Standard Model (SM) Higgs-like scalar mass to the measured value. At the same time, a lighter stop than in the MSSM is allowed. The Higgs decay rates in the studied model can somewhat differ from the SM expectations, although the most prominent difference is a universal suppression in the couplings due to the mixing of doublet scalars with singlets. The charged, pseudoscalar, and other than the two lightest scalar Higgses are typically heavier than 1 TeV in the parameter region where R-parity is spontaneously broken.