Lees, J. P.Poireau, V.Tisserand, V.Garra Tico, J.Grauges, E.Palano, A.Eigen, G.Izen, Joseph M.Lou, XinchouBaBar Collaboration2014-02-262014-02-262012-11-092012-11-090031-9007http://hdl.handle.net/10735.1/3086The photon spectrum in the inclusive electromagnetic radiative decays of the B meson, B→X_sγ plus B→X_dγ, is studied using a data sample of (382.8 ± 4.2)×10⁶Υ(4S) →BB̄ decays collected by the BABAR experiment at SLAC. The spectrum is used to extract the branching fraction ℬ(B→X_sγ)=(3. 21 ± 0.33) ×10⁻⁴ for E_γ > 1.8 GeV and the direct CP asymmetry A_{CP} (B→X_{s+d}γ)=0. 057 ± 0.063. The effects of detector resolution and Doppler smearing are unfolded to measure the photon energy spectrum in the B meson rest frame.en-US© 2012 American Physical SocietyB mesonsBranching fractions (Nuclear physics)HadronsTextLees, J. P., V. Poireau, V. Tisserand, J. Garra Tico, et al. 2012. "Precision measurement of the B → X_sγ photon energy spectrum, branching fraction, and direct CP asymmetry A_{CP}(B → X_{s+d}γ))." Physical Review Letters 109(19), doi:10.1103/PhysRevLett.109.19180110919