Analysis of the parameter space and spectrum of the $\mu \nu$SSM

TL;DR

This paper thoroughly analyzes the parameter space and spectrum of the $mbda u$SSM, a supersymmetric model addressing the ta problem, neutrino masses, and avoiding Goldstone bosons, with focus on Higgs and neutralino-neutrino mixing.

Contribution

It provides a detailed analysis of the viable parameter space, spectrum, and Higgs mass in the mbda u$SSM, including effects of sneutrino VEVs and neutralino-neutrino mixing.

Findings

Identified regions avoiding false minima and tachyons.

Computed the Higgs mass spectrum with sneutrino VEVs.

Analyzed neutralino-neutrino and Higgs-sneutrino mixing effects.

Abstract

The $\mu\nu$SSM is a supersymmetric standard model that solves the $\mu$ problem of the MSSM using the R-parity breaking couplings between the right-handed neutrino superfields and the Higgses in the superpotential, $\lambda_{i} \hat \nu^c_i \hat H_d \hat H_u$. The $\mu$ term is generated spontaneously through sneutrino vacuum expectation values, $\mu=\lambda_i < \tilde \nu^c_i>$, once the electroweak symmetry is broken. In addition, the couplings $\kappa_{ijk} \hat \nu^c_i\hat \nu^c_j\hat \nu^c_k$ forbid a global U(1) symmetry avoiding the existence of a Goldstone boson, and also contribute to spontaneously generate Majorana masses for neutrinos at the electroweak scale. Following this proposal, we have analysed in detail the parameter space of the $\mu\nu$SSM. In particular, we have studied viable regions avoiding false minima and tachyons, as well as fulfilling the Landau pole constraint. We have also computed the associated spectrum, paying special attention to the mass of the lightest Higgs. The presence of right and left-handed sneutrino vacuum expectation values leads to a peculiar structure for the mass matrices. The most important consequence is that neutralinos are mixed with neutrinos, and neutral Higgses with sneutrinos.