Precise prediction for the Higgs-Boson Masses in the $\mu \nu$SSM

Abstract

The $\mu \nu$SSM is a simple supersymmetric extension of the Standard Model (SM) capable of predicting neutrino physics in agreement with experiment. In this paper we perform the complete one-loop renormalization of the neutral scalar sector of the $\mu \nu$SSM with one generation of right-handed neutrinos in a mixed on-shell/$\overline{\mathrm{DR}}$ scheme. The renormalization procedure is discussed in detail, emphasizing conceptual differences to the minimal (MSSM) and next-to-minimal (NMSSM) supersymmetric standard model regarding the field renormalization and the treatment of non-flavor-diagonal soft mass parameters, which have their origin in the breaking of $R$-parity in the $\mu \nu$SSM. We calculate the full one-loop corrections to the neutral scalar masses of the $\mu \nu$SSM. The one-loop contributions are supplemented by available MSSM higher-order corrections. We obtain numerical results for a SM-like Higgs boson mass consistent with experimental bounds. We compare our results to predictions in the NMSSM to obtain a measure for the significance of genuine $\mu \nu$SSM-like contributions. We only find minor corrections due to the smallness of the neutrino Yukawa couplings, indicating that the Higgs boson mass calculations in the $\mu \nu$SSM are at the same level of accuracy as in the NMSSM. Finally we show that the $\mu \nu$SSM can accomodate a Higgs boson that could explain an excess of $\gamma \gamma$ events at $\sim 96\mathrm{GeV}$ as reported by CMS, as well as the $2\sigma$ excess of $b\bar{b}$ events observed at LEP at a similar mass scale.

Version published in EPJC. Numerical analysis improved, numerical results for NMSSM comparison changed accordingly, overall conclusions unchanged. 56 pages, 12 figures

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