Gluon penguin enhancements to inclusive charmless decays of b quark in the 2HDM with flavor changing couplings

Abstract

We calculate the enhancements to the inclusive charmless decays of b quark, b→sg,sq q ̄ ,sgg , from gluon penguin diagrams induced by the charged and neutral Higgs bosons ( H ±, h 0, H 0, and A 0) in the Two-Higgs-Doublet Model with flavor-changing couplings. Within the considered parameter space, the new contributions from charged Higgs boson are dominant. After including the new contributions, the branching ratio BR( b→ sg) ( q 2=0) can be increased form ∼0.2% in the standard model to 4.4% and 2.6% in the two-Higgs-doublet model for m H + =100 and 200 GeV, respectively. The new contribution to the decay mode b→sq q ̄ with q=( u, d, s) is, however, numerically small and peaked at the lower q 2 region. The new contribution to b→ sgg can also be neglected.