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http://hdl.handle.net/2445/131545
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 Experiments Particle physics Experiments |
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: https://doi.org/10.1103/PhysRevD.77.051103 |
It is part of: | Physical Review D, 2008, vol. 77, num. 5, p. 051103 |
URI: | http://hdl.handle.net/2445/131545 |
Related resource: | https://doi.org/10.1103/PhysRevD.77.051103 |
ISSN: | 1550-7998 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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577699.pdf | 185.29 kB | Adobe PDF | View/Open |
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