The origin of the 95 GeV excess in the flavor-dependent $$U(1)_X$$ U ( 1 ) X model

Abstract

Abstract This study investigates the excesses observed in the CMS diphoton and ditau data around $$95~{\textrm{GeV}}$$ 95 GeV within the framework of the flavor-dependent $$U(1)_X$$ U ( 1 ) X model. The model introduces a singlet scalar to explain the nonzero neutrino masses. This newly introduced Higgs interacts directly with the quark sector, motivated by the aim to explain the flavor numbers of the fermion sector. Additionally, it undergoes mixing with the SM-like Higgs boson. The study suggests that designating this singlet Higgs state in this model as the lightest Higgs boson holds great potential for explaining the excesses around $$95~{\textrm{GeV}}.$$ 95 GeV . In the calculations, we maintained the masses of the lightest and next-to-lightest Higgs bosons at around $$95~{\textrm{GeV}}$$ 95 GeV and $$125~{\textrm{GeV}}$$ 125 GeV respectively. It was found that the theoretical predictions on the signal strengthes $$\mu (h_{95})_{\gamma \gamma },$$ μ ( h 95 ) γ γ , $$\mu (h_{95})_{\tau \tau }$$ μ ( h 95 ) τ τ in the flavor-dependent $$U(1)_X$$ U ( 1 ) X model can be fitted well to the excesses observed at CMS.