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Measurements of Direct CP Asymmetries in B to X_s gamma decays using Sum of Exclusive Decays

Abstract : We measure the direct CP violation asymmetry, A_CP, in B to X_s gamma and the isospin difference of the asymmetry, Delta A_CP, using 429 fb^-1 of data collected at Upsilon(4S) resonance with the BaBar detector at the PEP-II asymmetric-energy e+e- storage rings operating at the SLAC National Accelerator Laboratory. B mesons are reconstructed from 10 charged B final states and 6 neutral B final states. We find A_CP = +(1.7 +- 1.9 +- 1.0)%, which is in agreement with the Standard Model prediction and provides an improvement on the world average. Moreover, we report the first measurement of the difference between A_CP for charged and neutral decay modes, Delta A_CP = +(5.0 +- 3.9 +- 1.5)%. Using the value of Delta A_CP, we also provide 68% and 90% confidence intervals on the imaginary part of the ratio of the Wilson coefficients corresponding to the chromo-magnetic dipole and the electromagnetic dipole transitions.
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http://hal.in2p3.fr/in2p3-00999799
Contributor : Sabine Starita <>
Submitted on : Wednesday, June 4, 2014 - 10:12:10 AM
Last modification on : Wednesday, September 16, 2020 - 4:26:29 PM

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J. P. Lees, V. Poireau, V. Tisserand, N. Arnaud, M. Davier, et al.. Measurements of Direct CP Asymmetries in B to X_s gamma decays using Sum of Exclusive Decays. Physical Review D, American Physical Society, 2014, 90 (9), pp.092001. ⟨10.1103/PhysRevD.90.092001⟩. ⟨in2p3-00999799⟩

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