Discriminating between SUSY and Non-SUSY Higgs Sectors through the Ratio $H \to b \bar b / H \to \tau^+ \tau^-$ with a 125 GeV Higgs boson

TL;DR

This paper investigates how the ratio of Higgs decay branching fractions to bottom quarks and tau leptons can distinguish between the Standard Model, MSSM, and 2HDM, using current and future collider data.

Contribution

It provides an updated analysis of the decay ratio R, highlighting its potential to differentiate SUSY from non-SUSY Higgs sectors with improved accuracy.

Findings

The ratio R is sensitive to SUSY radiative corrections at large tanβ.

Current LHC data constrains the Higgs sector models.

Future collider measurements can enhance model discrimination.

Abstract

It is still an open question whether the new scalar particle discovered at the LHC with a mass of 125 GeV is the SM Higgs boson or it belongs to models of new physics with an extended Higgs sector, as the MSSM or 2HDM. The ratio of branching fractions $R$ = BR($H \to b \bar b$)/BR($H \to \tau^+ \tau^-$) of Higgs boson decays is a powerful tool in order to distinguish the MSSM Higgs sector from the SM or non-supersymmetric 2HDM. This ratio receives large renormalization-scheme independent radiative corrections in supersymmetric models at large $\tan\beta$, which are insensitive to the SUSY mass scale and absent in the SM or 2HDM. Making use of the current LHC data and the upcoming new results on Higgs couplings to be reported by ATLAS and CMS collaborations and in a future linear collider, we develop a detailed and updated study of this ratio $R$ which improves previous analyses and sets the level of accuracy needed to discriminate between models.