Measurements of Direct CP Asymmetries in B→X_sγ Decays using Sum of Exclusive Decays

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Measurements of Direct CP Asymmetries in B→X_sγ Decays using Sum of Exclusive Decays

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Title: Measurements of Direct CP Asymmetries in B→X_sγ Decays using Sum of Exclusive Decays
Author(s):
Lees, J. P.;
Poireau, V.;
Tisserand, V.;
Grauges, E.;
Palano, A.;
Eigen, G.;
Stugu, B.;
Izen, Joseph M.;
Lou, Xinchou;
BaBar Collaboration
Date Created: 2014-11-05
Format: Text
Item Type: Article
Keywords: B mesons
CP violation (Nuclear physics)
Asymmetry
Isospin
Abstract: We measure the direct CP violation asymmetry, A_{CP}, in B→X_s and the isospin difference of the asymmetry, ΔA_{CP}, using 429 fb⁻¹ of data collected at ϒ(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 ten charged B final states and six 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, ΔA_{CP} = +(5.0 ± 3.9 ± 1.5)%. Using the value of ΔA(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.
Publisher: Amer Physical Soc
ISSN: 1550-7998
Source: Physical Review D
Link to Related Resource: http://dx.doi.org/10.1103/PhysRevD.90.092001
Persistent Link: http://hdl.handle.net/10735.1/4298
Bibliographic Citation: Lees, J. P., V. Poireau, V. Tisserand, E. Grauges, et al. 2014. "Measurements of direct CP asymmetries in B→Χ_sγ decays using sum of exclusive decays." Physical Review D 90(9), doi:10.1103/PhysRevD.90.092001
Terms of Use: ©2014 American Physical Society

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