The photon spectrum in the inclusive electromagnetic radiative decays of the B meson, B→Xsγ plus B→Xdγ, is studied using a data sample of (382.8±4.2)×106Υ(4S)→BB¯ decays collected by the BABAR experiment at SLAC. The spectrum is used to extract the branching fraction B(B→Xsγ)=(3.21±0.33)×10-4 for Eγ>1.8GeV and the direct CP asymmetry ACP(B→Xs+dγ)=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.

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

LANCERI, LIVIO;VITALE, LORENZO;
2012

Abstract

The photon spectrum in the inclusive electromagnetic radiative decays of the B meson, B→Xsγ plus B→Xdγ, is studied using a data sample of (382.8±4.2)×106Υ(4S)→BB¯ decays collected by the BABAR experiment at SLAC. The spectrum is used to extract the branching fraction B(B→Xsγ)=(3.21±0.33)×10-4 for Eγ>1.8GeV and the direct CP asymmetry ACP(B→Xs+dγ)=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.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11368/2767932
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