The photon spectrum in B→Xsγ decay, where Xs is any strange hadronic state, is studied using a data sample of (382.8±4.2)×106 e+e−→Υ(4S)→BB⎯⎯⎯ events collected by the BABAR experiment at the PEP-II collider. The spectrum is used to measure the branching fraction ℬ(B→Xsγ)=(3.21±0.15±0.29±0.08)×10−4 and the first, second, and third moments ⟨Eγ⟩=2.267±0.019±0.032±0.003  GeV, ⟨(Eγ−⟨Eγ⟩)2⟩=0.0484±0.0053±0.0077±0.0005  GeV2, and ⟨(Eγ−⟨Eγ⟩)3⟩=−0.0048±0.0011±0.0011±0.0004  GeV3, for the range Eγ>1.8  GeV, where Eγ is the photon energy in the B-meson rest frame. Results are also presented for narrower Eγ ranges. In addition, the direct CP asymmetry ACP(B→Xs+dγ) is measured to be 0.057±0.063. The spectrum itself is also unfolded to the B-meson rest frame; that is the frame in which theoretical predictions for its shape are made.

Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., et al. (2012). Measurement of B (B -> Xs gamma), the B -> Xs gamma photon energy spectrum, and the direct CP asymmetry in B -> Xs+d gamma decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 86(11), 1-33 [10.1103/PhysRevD.86.112008].

Measurement of B (B -> Xs gamma), the B -> Xs gamma photon energy spectrum, and the direct CP asymmetry in B -> Xs+d gamma decays

PATRIGNANI, CLAUDIA;
2012

Abstract

The photon spectrum in B→Xsγ decay, where Xs is any strange hadronic state, is studied using a data sample of (382.8±4.2)×106 e+e−→Υ(4S)→BB⎯⎯⎯ events collected by the BABAR experiment at the PEP-II collider. The spectrum is used to measure the branching fraction ℬ(B→Xsγ)=(3.21±0.15±0.29±0.08)×10−4 and the first, second, and third moments ⟨Eγ⟩=2.267±0.019±0.032±0.003  GeV, ⟨(Eγ−⟨Eγ⟩)2⟩=0.0484±0.0053±0.0077±0.0005  GeV2, and ⟨(Eγ−⟨Eγ⟩)3⟩=−0.0048±0.0011±0.0011±0.0004  GeV3, for the range Eγ>1.8  GeV, where Eγ is the photon energy in the B-meson rest frame. Results are also presented for narrower Eγ ranges. In addition, the direct CP asymmetry ACP(B→Xs+dγ) is measured to be 0.057±0.063. The spectrum itself is also unfolded to the B-meson rest frame; that is the frame in which theoretical predictions for its shape are made.
2012
Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., et al. (2012). Measurement of B (B -> Xs gamma), the B -> Xs gamma photon energy spectrum, and the direct CP asymmetry in B -> Xs+d gamma decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 86(11), 1-33 [10.1103/PhysRevD.86.112008].
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/11585/537411
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