Analysis ofat Next-to-Next-to-Leading Order with a Cut on Photon Energy
- 12 January 2007
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 98 (2) , 022003
- https://doi.org/10.1103/physrevlett.98.022003
Abstract
By combining a recent estimate of the total B-->X(s)gamma branching fraction at O(alpha(s)2) with a detailed analysis of the effects of a cut E(gamma)>or=1.6 GeV on photon energy, a prediction for the partial B-->Xsgamma branching fraction at next-to-next-to-leading order in renormalization-group improved perturbation theory is obtained, in which contributions from all relevant scales are factorized. The result B(B-->Xsgamma)=(2.98+/-0.26) x 10(-4) is about 1.4 sigma lower than the experimental world average. This opens a window for significant new physics contributions in rare radiative B decays.Keywords
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