Towards the NNLL precision in B Xs γ
H. Asatrian, A. Hovhannisyan, V. Poghosyan, C. Greub, T. Hurth
Abstract
The present NLL prediction for the decay rate of the rare inclusive process B Xs γ has a large uncertainty due to the charm mass renormalization scheme ambiguity. We estimate that this uncertainty will be reduced by a factor of 2 at the NNLL level. This is a strong motivation for the on-going NNLL calculation, which will thus significantly increase the sensitivity of the observable B Xs γ to possible new degrees of freedom beyond the SM. We also give a brief status report of the NNLL calculation.
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