Footprints of Supersymmetry on Higgs Decay

TL;DR

This paper investigates how supersymmetry could cause observable deviations in Higgs decay widths at future colliders, even when superparticles are beyond current detection capabilities.

Contribution

It analyzes the potential deviations in Higgs decay widths within the MSSM under realistic constraints, highlighting the possibility of detecting supersymmetry effects at future colliders.

Findings

Large deviations are excluded by current constraints.

Deviations may still be observable at future $e^+e^-$ colliders.

Most parameter regions with significant deviations are ruled out by phenomenological constraints.

Abstract

Motivated by future collider proposals that aim to measure the Higgs properties precisely, we study the partial decay widths of the lightest Higgs boson in the minimal supersymmetric standard model with an emphasis on the parameter region where all superparticles and heavy Higgs bosons are not accessible at the LHC. Taking account of phenomenological constraints such as the Higgs mass, flavor constraints, vacuum stability, and perturbativity of coupling constants up to the grand unification scale, we discuss how large the deviations of the partial decay widths from the standard model predictions can be. These constraints exclude large fraction of the parameter region where the Higgs widths show significant deviation from the standard model predictions. Nevertheless, even if superparticles and the heavy Higgses are out of the reach of 14TeV LHC, the deviation may be large enough to be observed at future $e^+e^-$ collider experiments.