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, $b\to sg,sq\bar{q},sgg$, from gluon penguin diagrams induced by the charged and neutral Higgs bosons $(H^{\pm },h^0,H^0$, 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 $BR(b\to sg)$ (q^2 =0) can be increased form $\sim 0.2$ 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 $b\to sq\bar{q}$ with q=(u,d,s) is, however, numerically small and peaked at the lower q^2 region. The new contribution to $b\to sgg$ can also be neglected.

Comments: Latex file, 14 pages with 6 PS or EPS figures. corrected some typos, added new references