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>1.8  GeV 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.

Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., et al. (2012). Precision Measurement of the B -> Xs gamma Photon Energy Spectrum, Branching Fraction, and Direct CP Asymmetry ACP(B -> Xs+d gamma). PHYSICAL REVIEW LETTERS, 109(19), 1-8 [10.1103/PhysRevLett.109.191801].

Precision Measurement of the B -> Xs gamma Photon Energy Spectrum, Branching Fraction, and Direct CP Asymmetry ACP(B -> Xs+d gamma)

PATRIGNANI, CLAUDIA;
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>1.8  GeV 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.
2012
Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., et al. (2012). Precision Measurement of the B -> Xs gamma Photon Energy Spectrum, Branching Fraction, and Direct CP Asymmetry ACP(B -> Xs+d gamma). PHYSICAL REVIEW LETTERS, 109(19), 1-8 [10.1103/PhysRevLett.109.191801].
Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Brown, D. N.; Kerth, L. T.; Kolomensky, Yu. G....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/537369
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