We evaluate the O( αem αs ) correction to the rate of B → X s γ decay, i.e. we resum all the.. . Our calculation differs from the previously available one by that it takes into account the complete relevant set of operators. The correction is found to be negligible, i.e. it is below 1%, in accordance with the former results. ⋆ This paper is based on the M.Sc. thesis of the first author.At present, the next-to-leading logarithmic QCD analysis of B → X s γ decay allows predicting its branching ratio with around 10% accuracy [1]. The current accuracy on the experimental side is around 15% [2], which is expected to be improved soon. Therefore, it is important to examine the size of the dominant electroweak corrections to this decay mode.
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