Charm multiplicity and the branching ratios of inclusive charmless b quarkdecays in the general two-Higgs-doublet models - art. no. 094008

In the framework of general two-Higgs-doublet models, we calculate the bran ching ratios of various inclusive charmless b decays by using the low-energ y effective Hamiltonian including next-to-leading order QCD corrections, an d examine the current status and the new physics effects on the determinati on of the charm multiplicity n(c) and semileptonic branching ratio B-SL Wit hin the considered parameter space, the enhancement to the ratio BR(b-->sg) due to the charged-Higgs penguin diagrams can be as large as a factor of 8 (3) in the model III (II), while the ratio BR(b-->no charm) can be increas ed from the standard model prediction of 2.49 to 4.91 % (2.99%) in model II I (II). Consequently, the value of B-SL and n(c) can be decreased simultane ously in model III. The central value of B-SL Will be lowered slightly by a bout 0.003, but the ratio n(c) can be reduced significantly from the theore tical prediction of n(c) = 1.28 +/- 0.05 in the SM to n(c) = 1.23 +/- 0.05, 1.18 +/- 0.05 for m(H+) = 200, 100 GeV, respectively. We find that the pre dicted n(c) and the measured n(c) now agree within roughly one standard dev iation after taking into account the effects of gluonic charged Higgs pengu in diagrams in model III with a relatively light charged Higgs boson.