Abstract
We report on a calculation of Higgs-boson contributions to the decays and which are governed by the effective Hamiltonian describing Compact formulas for the Wilson coefficients are provided in the context of the type-II two-Higgs-doublet model (2HDM) and supersymmetry (SUSY) with minimal flavor violation, focusing on the case of large We derive, in a model-independent way, constraints on Higgs-boson-mediated interactions, using present experimental results on rare B decays including and In particular, we assess the impact of possible scalar and pseudoscalar interactions transcending the standard model (SM) on the branching ratio of and the forward-backward (FB) asymmetry of in decay. The average FB asymmetry, which is unobservably small within the SM, and therefore a potentially valuable tool to search for new physics, is predicted to be no greater than 4% for a nominal branching ratio of about Moreover, striking effects on the decay spectrum of are already ruled out by experimental data on the branching fraction. In addition, we study the constraints on the parameter space of the 2HDM and SUSY with minimal flavor violation. While the type-II 2HDM does not give any sizable contributions to the above decay modes, we find that SUSY contributions obeying the constraint on can significantly affect the branching ratio of We also comment on previous calculations contained in the literature.
- Received 2 May 2001
DOI:https://doi.org/10.1103/PhysRevD.64.074014
©2001 American Physical Society