The decayH 2 0 →gg within the Minimal Supersymmetric Standard Model

Abstract

I present a detailed SUSY QCD calculation of the decay rate of the lightest Higgs bosonH20 into two gluons, where all quarks and scalar quarks are taken within the relevant loop diagrams. I include the mixing of all the scalar partners of the left and right handed quarks and show that their contribution is more than several tens of per cent compared to the quark contribution in the MSSM for some SUSY parameter space. Furthermore the MSSM fermionic contribution is enhanced by several factors for large tanβ and large Higgs masses. As a result, the two gluon decay rate ofH20 is much larger than the two gluon decay rate of an equal mass standard model Higgs boson. I further compare the decay mode ofH20→gg to the similar decay modes ofH20→cc andH20→bb including one loop QCD corrections and show that in some casesΓ(H20→gg) is even higher thanΓ(H20→cc), although still much smaller thanΓ(H20→bb).