The $B->X_{s}gammagamma$ decay in the standard model and the general two-Higgs-doublet model

Abstract

Based on the low-energy effective Hamiltonian, we calculate the new physics corrections to the branching ratio and the differential distributions of the rare decay $B\to X_s\gamma \gamma$ induced by the new gluonic and electroweak charged-Higgs penguin diagrams in the general two-Higgs-doublet model with the restriction ${\lambda }_{ij}^{U,D}=0$ for $i\ne j$. Within the considered parameter space, we see the following: (a) the standard model predictions of $\mathcal{B}(B\to X_s\gamma \gamma )$ and $A_{FB}$ have a moderate $m_s$ dependence; (b) in model III, the prediction of the branching ratio $\mathcal{B}(B\to X_s\gamma \gamma )$ ranges from one third to three times of the standard model prediction, but is highly correlated with that of $(B\to X_s\gamma )$; (c) the new physics enhancement to the branching ratio $\mathcal{B}(B\to X_s\gamma \gamma )$ in model II can be as large as $(30-50)$; (d) the contribution from 1PR diagrams is dominant and hence four normalized differential distributions are insensitive to the variation of scale $\mu$ and possible new physics corrections; (e) due to the smallness of its decay rate and the long-distance background, the $B\to X_s\gamma \gamma$ decay is not a better process in detecting new physics than the $B\to X_s\gamma$ decay.

Comments: Latex file, 27 pages with 17 ps and eps figures. Accepted for publication in Phys.Rev. D