QCD corrections to the t-->H+b decay within the minimal supersymmetric standard model

Abstract

I present the contribution of gluinos and scalar quarks to the decay rate of the top quark into a charged Higgs boson and a bottom quark within the minimal supersymmetric standard model, including the mixing of the scalar partners of the left- and right-handed top quark. I show that for certain values of the supersymmetric parameters the standard QCD loop corrections to this decay mode are diminished or enhanced by several 10 per cent. I show that not only a small value of 3 GeV for the gluino mass (small mass window) but also much larger values of several hundreds of GeV's have a non-neglible effect on this decay rate, against general belief. Last but not least, if the ratio of the vacuum expectation values of the Higgs bosons are taken in the limit of $v_1\ll v_2$ I obtain a drastic enhancement due to a $\tan \beta$\ dependence in the couplings.

UQAM-PHE-94/01, 6 pages, plain tex, 4 figures not included, available under request via mail or fax

References in corpus (6)

• Perturbative QCD data are consistent with light gluinos
• QCD corrections to the charged Higgs decay of a heavy quark
• Supersymmetric QCD corrections to quark pair production in e+ e- annihilation
• QCD Corrections to the Charged-Higgs-Boson Decay of a Heavy Top Quark
• On the QCD corrections to the charged Higgs decay of a heavy quark
• Electroweak corrections to decays involving a charged Higgs boson

Cited by in corpus (2)

• Supersymmetric QCD corrections to the top quark decay of a heavy charged higgs boson
• Supersymmetric QCD Corrections to the Charged Higgs Boson Decay of the Top Quark