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Title: Measurement of the photon energy spectrum and branching fraction for the decay B --> Xsγ using the BaBar Detector
Author: Hopkins, David Anthony
ISNI:       0000 0004 2670 2836
Awarding Body: Royal Holloway, University of London
Current Institution: Royal Holloway, University of London
Date of Award: 2008
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A measurement of the branching fraction and photon energy spectrum for the decay B --> Xsγ using data from the BABAR experiment is presented. The data sample corresponds to an integrated luminosity of 210 fb⁻¹ , from which approximately 680000 BB 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. The full reconstruction of one of the B mesons allows for an inclusive measurement of the photon energy spectrum in the B rest frame. A branching fraction of B(B --> Xsγ) = (3.66 ± O.85stat ± O.60sysd x 10-4) was measured for photon energies Er above 1.9 GeV. From the measured spectrum the first and second moments for different minimum photon energies are calculated, which are used to extract the heavy quark parameters mb and μ ²/π. In addition, measurements of the direct GP asymmetry and the isospin asymmetry are presented.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available