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Measurement of the B --> X_s gamma Branching Fraction and Photon Energy Spectrum using the Recoil Method
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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.
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Reevaluating Uncertainties in $\bar B\to X_s\gamma$ Decay
New moment relations for the soft function g17, combined with a 2016 global fit of HQET parameters, tighten the resolved photon contribution to the B -> X_s gamma total rate to about [-0.3,+1.6]% but widen the CP-asym...
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