Light charged Higgs at the beginning of the LHC era

TL;DR

This paper investigates the possibility of a light charged Higgs boson within various models, analyzing experimental constraints and implications for collider and indirect searches at the dawn of the LHC era.

Contribution

It provides a comprehensive analysis of the viability of light charged Higgs bosons in non-minimal Higgs sectors, especially within supersymmetric models, considering current experimental constraints.

Findings

Light charged Higgs bosons remain viable in certain supersymmetric scenarios.

Large tan beta enhances the parameter space for light Higgs bosons.

Decay B to tau nu constrains the charged-Higgs parameter space.

Abstract

The terascale will be explored with the start of the LHC. One of the most fundamental questions which we expect to be answered is the root of electroweak symmetry breaking and whether the Higgs mechanism is realized in nature or not. In this context we pose the question if existing experimental data still allow for a light non-minimal Higgs sector. We tackle this question first in the context of the two Higgs doublet model and then we concentrate in two supersymmetric models, the constrained MSSM and the MSSM with non-universal Higgs masses. In both supersymmetric scearios, light pseudoscalar and light charged-Higgs bosons are still viable provided tan beta is large. In this regime, we emphasize the importance of the constraints provided by the decay B to tau nu mediated by the charged-Higgs at tree-level. In addition we comment on generic predictions for hadronic colliders and indirect searches in such scenarios.