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Title: Measurement of the B→Xsγ branching fraction and photon energy spectrum using the recoil method
Author: Garra Ticó, Jordi
Graugés Pous, Eugeni
BABAR Collaboration
Keywords: Física de partícules
Particle physics
Issue Date: 12-Mar-2008
Publisher: American Physical Society
Abstract: We present a measurement of the branching fraction and photon-energy spectrum for the decay B → X s γ using data from the BABAR experiment. The data sample corresponds to an integrated luminosity of 210     fb − 1 , from which approximately 680 000 B ¯¯¯ B events are tagged by a fully reconstructed hadronic decay of one of the B mesons. In the decay of the second B meson, an isolated high-energy photon is identified. We measure B ( B → X s γ ) = ( 3.66 ± 0.85 stat ± 0.60 syst ) × 10 − 4 for photon energies E γ above 1.9 GeV in the B rest frame. From the measured spectrum we calculate the first and second moments for different minimum photon energies, which are used to extract the heavy-quark parameters m b and μ 2 π . In addition, measurements of the direct C P asymmetry and isospin asymmetry are presented.
Note: Reproducció del document publicat a:
It is part of: Physical Review D, 2008, vol. 77, num. 5, p. 051103
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ISSN: 1550-7998
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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