Is there a (Pseudo)Scalar at 95 GeV?

TL;DR

This paper explores whether a 95 GeV scalar or pseudoscalar resonance, suggested by recent experiments, can be explained by extended Higgs models like 2HDM+s or 2HDM+a, considering theoretical and experimental constraints.

Contribution

It provides a comprehensive analysis of the 2HDM+s and 2HDM+a models in light of recent 95 GeV resonance hints, including various Yukawa coupling configurations and constraints.

Findings

Certain 2HDM+s and 2HDM+a scenarios can accommodate the 95 GeV resonance.

The models are consistent with flavor physics and collider bounds under specific parameter choices.

The analysis identifies viable regions in parameter space for the extended Higgs models.

Abstract

We discuss the possibility of interpreting the recent experimental hints, in favour of a 95 GeV resonance, with extensions of the Standard Model featuring an extra Higgs doublet and SM scalar (2HDM+s) or pseudoscalar singlet (2HDM+a). The possibility of reproducing the experimental anomalies will be compared with the theoretical constraints on the extended Higgs sector as well as complementary bounds coming from flavour physics as well as other colliders searchers. For both the 2HDM+s and 2HDM+a we will consider a generic natural flavour conserving (NFC) as well as the customary Type-I, -II, -X and -Y configurations of the Yukawa coupling to the BSM Higgs bosons.