Mass Spectrum and Higgs Profile in BLSSM

TL;DR

This paper explores the mass spectrum and Higgs decay predictions in the BLSSM, a supersymmetric model extended by U(1)_B-L symmetry, highlighting potential new Higgs states and their phenomenological implications.

Contribution

It provides detailed predictions of particle masses and Higgs decay channels in the BLSSM, including the possibility of a lighter Higgs boson and explanations for observed anomalies.

Findings

Degenerate right-handed neutrino masses (1.7-2.2 TeV)

Second Higgs boson lighter than 150 GeV

Potential explanation for h -> 4l excess at 145 GeV

Abstract

We investigate the predictions on the mass spectrum and Higgs boson decays in the supersymmetric standard model extended by U(1)_B-L symmetry (BLSSM). The model requires two singlet Higgs fields, which are responsible for the radiative breaking of U(1)_B-L symmetry. It predicts degenerate right-handed neutrino masses (1.7-2.2 TeV) as well as the right-handed sneutrinos of mass <~ 4 TeV. The presence of right-handed neutrinos and sneutrinos trigger the baryon and lepton number violation processes, until they decouple from the Standard model particles. Besides, the model predicts rather heavy colored particles; stop and sbottom massesare >~ 1.5 TeV, while stau mass >~ 100 GeV and chargino mass >~ 600 GeV. Even though, the implications are similar to minimal supersymmetric standard model, BLSSM can predict another Higgs boson lighter than 150 GeV. We find that the second Higgs boson can be degenerate with the lightest CP-even Higgs boson of mass about 125 GeV and contribute to the Higgs decay into two photons. In addition, it can provide an explanation for the excess in h -> 4l at the mass scale ~ 145 GeV.