 DOCUMENT METADATASLAC Publication: SLAC-PUB-15180
SLAC Release Date: November 1, 2013
Precision Measurement of the B to X_s \gamma Photon Energy Spectrum, Branching Fraction, and Direct CP Asymmetry A_{CP}(B to X_{s+d} \gamma
Lees, J. P..
The photon spectrum in the inclusive electromagnetic radiative decays of the B meson, B \to X_{s} \gamma plus B \to X_{d} \gamma, is studied using a data sample of (382.8 \pm 4.2) \times 10^6 \Upsilon(4S) \to B\overli\ ne{B} decays collected by the \babar\ experiment at SLAC. The spectrum is used to extract the branching fraction {\cal B}(B \to X_{s} \gamma)=(3.21 \pm 0.33)\times 10^{-4} for E_{\gamma}>1.8 \gev and the direct CP asymmetry A_{CP}(B \to X_{s+d} \gamma)=0.057 \pm 0.063. The effects... Show Full Abstract
The photon spectrum in the inclusive electromagnetic radiative decays of the B meson, B \to X_{s} \gamma plus B \to X_{d} \gamma, is studied using a data sample of (382.8 \pm 4.2) \times 10^6 \Upsilon(4S) \to B\overli\ ne{B} decays collected by the \babar\ experiment at SLAC. The spectrum is used to extract the branching fraction {\cal B}(B \to X_{s} \gamma)=(3.21 \pm 0.33)\times 10^{-4} for E_{\gamma}>1.8 \gev and the direct CP asymmetry A_{CP}(B \to X_{s+d} \gamma)=0.057 \pm 0.063. The effects of detector resolution and Doppler smearing are unfolded to\ measure the photon energy spectrum in the B meson rest frame. Show Partial Abstract
Download File:
|
