96 GeV scalar boson in the 2HDM with U(1)H gauge symmetry

Abstract

In this paper, we study two Higgs doublet models with gauged U(1)H symmetry instead of the usual softly broken Z2 symmetry, motivated by the excesses around 96 GeV reported by the CMS collaboration in the searches for light resonances decaying to two photons and two τ’s. In this model, one Higgs doublet field is charged under the U(1)H symmetry, thereby one can avoid tree-level flavor changing neutral currents. The extra U(1)H gauge symmetry requires extra chiral fermions, in order to satisfy the anomaly-free conditions. We analyze the signals of the light resonances, taking into account the contribution of the extra fermions, and discuss the consistency with the experimental results in this model.