Rare Decay $B\rightarrow X_s\nu\bar\nu$ in the Two-Higgs-Doublet Model of Type-III

Abstract

In this paper, we calculated the new physics contribution to theoretically very clean rare decay B → X s νν in the general two-Higgs-doublet model (model III). Within the considered parameter space, we found that (a) the new physics contribution can provide one to two orders of enhancement to the branching ratio B(B → X s νν) and can saturate the experimental bound on B(B → X s νν) in some regions of the parameter space; (b) besides the CLEO data of B → X s γ, the ALEPH upper limit on B(B → X s νν) also lead to further constraint on the size of the Yukawa coupling λ tt : λ tt < 6.4 for λ bb = 2.7 and m H + = 200 GeV.