Measurement of the B to Xs gammaBranching Fraction and Photon Energy Spectrum usingthe Recoil Method
We present a measurement of the branching fraction and photon energy spectrum for the decay B {yields} X{sub s}{gamma} using data from the BABAR experiment. The data sample corresponds to an integrated luminosity of 210 fb{sup -1}, from which approximately 680,000 B{bar 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 {Beta}(B {yields} X{sub s}{gamma}) = (3.66 {+-} 0.85{sub stat} {+-} 0.60{sub syst}) x 10{sup -4} for photon energies E{sub {gamma}} 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{sub b} and {mu}{sub {pi}}{sup 2}. In addition, measurements of the direct CP asymmetry and isospin asymmetry are presented.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 920596
- Report Number(s):
- SLAC-PUB-13021; arXiv:0711.4889; TRN: US0805324
- Journal Information:
- Submitted to Physical Review D, Rapid Communications, Journal Name: Submitted to Physical Review D, Rapid Communications
- Country of Publication:
- United States
- Language:
- English
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Measurements of the B to Xs gamma Branching Fraction and Spectral Shape from a Sum of Exclusive Final States
Measurements of the B{yields}X{sub s}{gamma} branching fraction and photon spectrum from a sum of exclusive final states