Invisible decays of the heavier Higgs boson in the minimal supersymmetric standard model

TL;DR

This paper explores the potential for the heavier Higgs boson in the MSSM to decay invisibly into neutralinos, analyzing how different gaugino mass boundary conditions affect these decays and their detectability at the LHC.

Contribution

It investigates the conditions under which the heavier MSSM Higgs boson can decay invisibly, especially focusing on arbitrary gaugino masses at the GUT scale, expanding previous analyses.

Findings

Invisible decays of the heavier Higgs are possible with arbitrary gaugino masses.

Universal and nonuniversal gaugino mass scenarios typically do not allow invisible decays of the 126 GeV Higgs.

The entire MSSM Higgs spectrum may be visible at the LHC even if some decay invisibly.

Abstract

We consider the possibility that the heavier CP-even Higgs boson~($H^0$) in the minimal supersymmetric standard model (MSSM) decays invisibly into neutralinos in the light of the recent discovery of the 126 GeV resonance at the CERN Large Hadron Collider (LHC). For this purpose we consider the minimal supersymmetric standard model with universal, non-universal and arbitrary boundary conditions on the supersymmetry breaking gaugino mass parameters at the grand unified scale. Typically, scenarios with universal and nonuniversal gaugino masses do not allow invisible decays of the lightest Higgs boson~($h^0$), which is identified with the $126$ GeV resonance, into the lightest neutralinos in the MSSM. With arbitrary gaugino masses at the grand unified scale such an invisible decay is possible. The second lightest Higgs boson can decay into various invisible final states for a considerable region of the MSSM parameter space with arbitrary gaugino masses as well as with the gaugino masses restricted by universal and nonuniversal boundary conditions at the grand unified scale.The possibility of the second lightest Higgs boson of the MSSM decaying into invisible channels is more likely for arbitrary gaugino masses at the grand unified scale. The heavier Higgs boson decay into lighter particles leads to the intriguing possibility that the entire Higgs boson spectrum of the MSSM may be visible at the LHC even if it decays invisibly, during the searches for an extended Higgs boson sector at the LHC. In such a scenario the nonobservation of the extended Higgs sector of the MSSM may carefully be used to rule out regions of the MSSM parameter space at the LHC.