Measurements of Direct CP Asymmetries in B → X[subscript s]γ Decays Using Sum of Exclusive Decays
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PhysRevD.90.092001.pdf
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Author(s)
Lees, J. P.
Poireau, V.
Tisserand, V.
Grauges, E.
Palano, A.
Eigen, G.
Stugu, B.
Brown, D. N.
Kerth, L. T.
Kolomensky, Yu. G.
Date Issued
November 2014
Journal
Physical Review D
Publisher
American Physical Society
Citation
Lees, J. P., V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, B. Stugu, et al. “Measurements of Direct CP Asymmetries in B → X[subscript s]γ Decays Using Sum of Exclusive Decays.” Phys. Rev. D 90, no. 9 (November 2014). © 2014 American Physical Society
Version
Final published version
Abstract
We measure the direct CP violation asymmetry, A[subscript CP], in B → X[subscript s]γ and the isospin difference of the asymmetry, ΔA[subscript CP], using 429 fb[superscript -1] of data collected at ϒ(4S) resonance with the BABAR detector at the PEP-II asymmetric-energy e[superscript +]e[superscript -] storage rings operating at the SLAC National Accelerator Laboratory. B mesons are reconstructed from ten charged B final states and six neutral B final states. We find A[subscript 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[subscript CP] for charged and neutral decay modes, ΔA[subscript CP] = +(5.0 ± 3.9 ± 1.5)%. Using the value of ΔA[subscript CP], we also provide 68% and 90% confidence intervals on the imaginary part of the ratio of the Wilson coefficients corresponding to the chromomagnetic dipole and the electromagnetic dipole transitions.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.90.092001
