Quark mass effects in B -> Xs gamma

By Paolo Gambino, M. Misiak. 2001

276 citations recorded by the source corpus.

The charm-loop contribution to B -> Xs gamma is found to be numerically dominant and very stable under logarithmic QCD corrections. The strong enhancement of the branching ratio by QCD logarithms is mainly due to the b-quark mass evolution in the top-quark sector. These observations allow us to achieve better control over residual scale dependence at the next-to-leading order. Furthermore, we observe that the sensitivity of the matrix element to mc/mb is the source of a sizeable uncertainty that has not been properly taken into account in previous analyses. Replacing mc^pole/mb^pole in this matrix element by the more appropriate mc(mu)/mb^pole with mc Xs gamma]. For E_gamma > 1.6 GeV in the B-meson rest frame, we find BR[ B -> Xs gamma]_{E_gamma > 1.6 GeV} = (3.60 +_ 0.30) * 10^-4. The difference between our result and the current experimental world average is consistent with zero at the level of 1 sigma. We also discuss the implementation of new physics effects in our calculation. The lower bound on the charged Higgs boson mass in 2HDM(II) is found the be higher than 350 GeV.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/03bd2f0b682e80a910882c58ff452042a81017ee

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In Nuclear and High Energy Physics

Citations in the corpus

The Next-to-Minimal Supersymmetric extension of the Standard Model reviewed (2009, background): “In contrast, the corresponding SM prediction [144] is, including the charm loop [145] as well as two-loop contributions [145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156] BR(b→ sγ) = (3.”
Present Status of Inclusive Rare B Decays (2002, methodology): “Moreover, there is a cut used in the Xs invariant mass spectrum at 2.1 GeV.”