Estimate of B ( B ¯ → X s γ ) at O ( α s 2 )

Estimate of B ( B ¯ → X s γ ) at O ( α s 2 )

Combining our results for various O({alpha}{sub s}{sup 2}) 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(B{yields}X{sub s}{gamma})=(3.15{+-}0.23)x10{sup -4} for E{sub {gamma}}&g...

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Veröffentlicht in:Physical review letters 2007, Vol.98 (2), Article 022002
Hauptverfasser: Misiak, M., Asatrian, H. M., Bieri, K., Czakon, M., Czarnecki, A., Ewerth, T., Ferroglia, A., Gambino, P., Gorbahn, M., Greub, C., Haisch, U., Hovhannisyan, A., Hurth, T., Mitov, A., Poghosyan, V., Ślusarczyk, M., Steinhauser, M.
Format: Artikel
Sprache:eng
Schlagworte:
B MESONS
BRANCHING RATIO
CORRECTIONS
ERRORS
GEV RANGE 01-10
INTERPOLATION
PARTICLE DECAY
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
QUADRATURES
QUANTUM CHROMODYNAMICS
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Zusammenfassung:Combining our results for various O({alpha}{sub s}{sup 2}) 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(B{yields}X{sub s}{gamma})=(3.15{+-}0.23)x10{sup -4} for E{sub {gamma}}>1.6 GeV in the B-meson rest frame. The four types of uncertainties: nonperturbative (5%), parametric (3%), higher-order (3%), and m{sub c}-interpolation ambiguity (3%) have been added in quadrature to obtain the total error.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.98.022002