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Phys. Rev. Lett. 98, 022002 (2007) [4 pages]

Estimate of B(B̅ →Xsγ) at O(αs2)

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M. Misiak1,2, H. M. Asatrian3, K. Bieri4, M. Czakon5, A. Czarnecki6, T. Ewerth4, A. Ferroglia7, P. Gambino8, M. Gorbahn9, C. Greub4, U. Haisch10, A. Hovhannisyan3, T. Hurth2,11, A. Mitov12, V. Poghosyan3, M. Ślusarczyk6, and M. Steinhauser9
1Institute of Theoretical Physics, Warsaw University, PL-00-681 Warsaw, Poland
2Theoretical Physics Division, CERN, CH-1211 Geneva 23, Switzerland
3Yerevan Physics Institute, 375036 Yerevan, Armenia
4Institut für Theoretische Physik, Universität Bern, CH-3012 Bern, Switzerland
5Institut für Theoretische Physik und Astrophysik, Universität Würzburg, D-97074 Würzburg, Germany
6Department of Physics, University of Alberta, AB T6G 2J1 Edmonton, Canada
7Physikalisches Institut, Albert-Ludwigs-Universtität, D-79104 Freiburg, Germany
8INFN, Torino & Dipartimento di Fisica Teorica, Università di Torino, I-10125 Torino, Italy
9Institut für Theoretische Teilchenphysik, Universität Karlsruhe (TH), D-76128 Karlsruhe, Germany
10Institut für Theoretische Physik, Universität Zürich, CH-8057 Zürich, Switzerland
11SLAC, Stanford University, Stanford, California 94309, USA
12Deutsches Elektronen-Synchrotron DESY, D-15738 Zeuthen, Germany

Received 24 September 2006; published 12 January 2007

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 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.022002
DOI:
10.1103/PhysRevLett.98.022002
PACS:
12.38.Bx, 13.20.He

See Also

See Also: Thomas Becher and Matthias Neubert, Analysis of B(B̅ →Xsγ) at Next-to-Next-to-Leading Order with a Cut on Photon Energy, Phys. Rev. Lett. 98, 022003 (2007).

 
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