Lessons from B → X S Γ in Two Higgs Doublet Models

Lessons from B → X S Γ in Two Higgs

The next–to–leading order predictions for the branching ratio BR(B → X s γ) are given in a generalized class of two Higgs doublets models. Included are the recently calculated leading QED corrections. It is shown that the high accuracy of the Standard Model calculation is in general not shared by these models. Updated lower limits on the mass of the charged Higgs boson in Two Higgs Doublet Mode...

Next - to - Leading QCD Corrections to B → X s γ : Standard Model and Two - Higgs Doublet Model

We present the QCD corrections to the matching conditions of the ∆B = 1 magnetic and chromo-magnetic operators in the Standard Model and in two-Higgs doublet models. We use an off-shell matching procedure which allows us to perform the computation using Taylor series in the external momenta, instead of asymptotic expansions. In the Standard Model case, we confirm previous results derived on-she...

April 1997 b → s l l process and multi - Higgs doublet model

Rare b decay processes are analyzed in the multi-Higgs doublet model. Taking account of the constraint from the b → s γ process, the branching ratio and the forward-backward asymmetry of the final leptons for the b → s ll process are calculated. It is shown that the branching ratio can be a few times larger than the standard model prediction and the asymmetry can be significantly different from...

Separating Different Models from Measuring α , β , γ

New physics effects on the B 0 − ¯ B 0 mixing and B-decay amplitudes are discussed. By a combined analysis, the models of new physics can be partially distinguished. It is emphasized that the extraction of unitarity angles β and γ through rare decay K → πν˜ν and charged B decay B ± → DK ± respectively is not likely to be affected by new physics. Such an observation could be used to distinguish ...

Addendum to : “ Two Higgs Doublet Model predictions for B → X s γ in NLO QCD ” ∗