Combining our results for various O(αs2) corrections to the weak radiative B-meson decay, we are able to present the first estimate of the branching ratio at the next-to-next-to-leading order in QCD. We find B(B̅ →Xsγ)=(3.15±0.23)×10-4 for Eγ>1.6  GeV in the B̅ -meson rest frame. The four types of uncertainties: nonperturbative (5%), parametric (3%), higher-order (3%), and mc-interpolation ambiguity (3%) have been added in quadrature to obtain the total error.

Estimate of B(anti-B ---> X(s) gamma) at O(alpha(s)**2)

GAMBINO, Paolo;
2007-01-01

Abstract

Combining our results for various O(αs2) corrections to the weak radiative B-meson decay, we are able to present the first estimate of the branching ratio at the next-to-next-to-leading order in QCD. We find B(B̅ →Xsγ)=(3.15±0.23)×10-4 for Eγ>1.6  GeV in the B̅ -meson rest frame. The four types of uncertainties: nonperturbative (5%), parametric (3%), higher-order (3%), and mc-interpolation ambiguity (3%) have been added in quadrature to obtain the total error.
2007
98
022002-1
022002-4
M. MISIAK; H. M. ASATRIAN; K. BIERI; M. CZAKON; A. CZARNECKI; T. EWERTH; A. FERROGLIA; P. GAMBINO; M. GORBAHN; C. GREUB; U. HAISCH; A. HOVHANNISYAN; T...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/6085
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