Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2007-11-30
Phys.Rev.D77:051103,2008
Physics
High Energy Physics
High Energy Physics - Experiment
9 pages, 2 postscript figures, updated references for v2
Scientific paper
10.1103/PhysRevD.77.051103
We present a measurement of the branching fraction and photon energy spectrum for the decay B --> X_s gamma using data from the BaBar experiment. The data sample corresponds to an integrated luminosity of 210 fb^{-1}, from which approximately 680 000 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. We measure BR(B --> X_s gamma) = (3.66 +- 0.85_{stat} +- 0.60_{syst}) x 10^{-4} for photon energies E_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_b and mu_{pi}^2. In addition, measurements of the direct CP asymmetry and isospin asymmetry are presented.
"The BABAR Collaboration
Aubert B.
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