Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-10-17
Physics
High Energy Physics
High Energy Physics - Phenomenology
(talk given at ICHEP '94), 2 pp (figures not included), LaTeX, INFN-ISS 94/9 (October 1994)
Scientific paper
Theoretical predictions for the branching ratios of the $B \rightarrow X_s\,\gamma$ and $B \rightarrow K^*\,\gamma$ decays are calculated in the Standard Model and in the (type II) two-Higgs-doublet model. Both the complete leading and the partially known next-to-leading order QCD corrections are included. The uncertainties due to the regularization scheme dependence introduced by the incomplete NLO terms are discussed. The results are compared with the recent CLEO II measurements and a new lower limit on the charged Higgs boson mass, $M_{H^\pm} > \sim 200$ GeV, is obtained.
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