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Precision Measurement of the B→X_{s}γ Photon Energy Spectrum, Branching Fraction, and Direct CP Asymmetry A_{CP}(B→X_{s+d}γ).

著者 Lees JP , Poireau V , Tisserand V , Garra Tico J , Grauges E , Palano A , Eigen G , Stugu B , Brown DN , Kerth LT , Kolomensky YG , Lynch G , Koch H , Schroeder T , Asgeirsson DJ , Hearty C , Mattison TS , McKenna JA , So RY , Khan A , Blinov VE , Buzykae
Phys Rev Lett.2012 Nov 9 ; 109(19):191801.
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Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), Université de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux, France.

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The photon spectrum in the inclusive electromagnetic radiative decays of the B meson, B→X_{s}γ plus B→X_{d}γ, is studied using a data sample of (382.8±4.2)×10^{6}Υ(4S)→BB[over ¯] decays collected by the BABAR experiment at SLAC. The spectrum is used to extract the branching fraction B(B→X_{s}γ)=(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.
PMID: 23215373 [PubMed - in process]
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