Measurement of CP observables in B±-->DCPK± decays and constraints on the CKM angle gamma
Name
Sanchez-2010-Measurement of CP ob.pdf
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Author(s)
Sciolla, Gabriella
Zhao, M.
Dujmic, Denis
Fisher, Peter H
Cowan, Ray F
Alternative Title
Measurement of CP observables in B±→DCPK± decays and constraints on the CKM angle γ
Date Issued
October 2010
Journal
Physical Review D
Publisher
American Physical Society
Citation
del Amo Sanchez, P. et al. “Measurement of CP observables in B^{±}-->D_{CP}K^{±} decays and constraints on the CKM angle gamma.” Physical Review D 82.7 (2010): 072004. © 2010 The American Physical Society.
Version
Final published version
Abstract
Using the entire sample of 467×106 Υ(4S)-->BB[over-bar] decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at the SLAC National Accelerator Laboratory, we perform an analysis of B±-->DK± decays, using decay modes in which the neutral D meson decays to either CP-eigenstates or non-CP-eigenstates. We measure the partial decay rate charge asymmetries for CP-even and CP-odd D final states to be ACP+=0.25±0.06±0.02 and ACP-=-0.09±0.07±0.02, respectively, where the first error is the statistical and the second is the systematic uncertainty. The parameter ACP+ is different from zero with a significance of 3.6 standard deviations, constituting evidence for direct CP violation. We also measure the ratios of the charged-averaged B partial decay rates in CP and non-CP decays, RCP+=1.18±0.09±0.05 and RCP-=1.07±0.08±0.04. We infer frequentist confidence intervals for the angle gamma of the unitarity triangle, for the strong phase difference deltaB, and for the amplitude ratio rB, which are related to the B--->DK- decay amplitude by rBei(deltaB-gamma)=A(B--->D̅ 0K-)/A(B--->D0K-). Including statistical and systematic uncertainties, we obtain 0.24
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.82.072004
