We present a measurement of the branching fraction and photon-energy spectrum for the decay B→Xsγ using data from the BABAR experiment. The data sample corresponds to an integrated luminosity of 210fb-1, from which approximately 680000 BB̄ events are tagged by a fully reconstructed hadronic decay of one of the B mesons. In the decay of the second B meson, an isolated high-energy photon is identified. We measure B(B→Xsγ)=(3. 66±0.85stat±0.60syst)×10-4 for photon energies Eγ above 1.9GeV in the B rest frame. From the measured spectrum we calculate the first and second moments for different minimum photon energies, which are used to extract the heavy-quark parameters mb and μπ2. In addition, measurements of the direct CP asymmetry and isospin asymmetry are presented. © 2008 The American Physical Society.

Aubert, B., Bona, M., Karyotakis, Y., Lees, J.P., Poireau, V., Prudent, X., et al. (2008). Measurement of the B→Xsγ branching fraction and photon energy spectrum using the recoil method. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 77(5), 1-8 [10.1103/PhysRevD.77.051103].

Measurement of the B→Xsγ branching fraction and photon energy spectrum using the recoil method

PATRIGNANI, CLAUDIA;
2008

Abstract

We present a measurement of the branching fraction and photon-energy spectrum for the decay B→Xsγ using data from the BABAR experiment. The data sample corresponds to an integrated luminosity of 210fb-1, from which approximately 680000 BB̄ events are tagged by a fully reconstructed hadronic decay of one of the B mesons. In the decay of the second B meson, an isolated high-energy photon is identified. We measure B(B→Xsγ)=(3. 66±0.85stat±0.60syst)×10-4 for photon energies Eγ above 1.9GeV in the B rest frame. From the measured spectrum we calculate the first and second moments for different minimum photon energies, which are used to extract the heavy-quark parameters mb and μπ2. In addition, measurements of the direct CP asymmetry and isospin asymmetry are presented. © 2008 The American Physical Society.
2008
Aubert, B., Bona, M., Karyotakis, Y., Lees, J.P., Poireau, V., Prudent, X., et al. (2008). Measurement of the B→Xsγ branching fraction and photon energy spectrum using the recoil method. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 77(5), 1-8 [10.1103/PhysRevD.77.051103].
Aubert, B; Bona, M.; Karyotakis, Y.; Lees, J.P.; Poireau, V.; Prudent, X.; Tisserand, V.; Zghiche, A.; Tico, J. Garra; Grauges, E.; Lopez, L.; Palano,...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/548276
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