Measurements of Indirect CP Asymmetries in D[superscript 0] → K[superscript −K[superscript +] and D[superscript 0] → π[superscript −]π[superscript +] Decays
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Aaij-2014-Measurement of Indirect CP.pdf
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Author(s)
Williams, Michael
Date Issued
January 2014
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R., B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, et al. “Measurements of Indirect CP Asymmetries in D[superscript 0] → K[superscript −K[superscript +] and D[superscript 0] → π[superscript −]π[superscript +] Decays.” Physical Review Letters 112, no. 4 (January 2014). © 2014 CERN, for the LHCb Collaboration
Version
Final published version
Abstract
A study of indirect CP violation in D[superscript 0] mesons through the determination of the parameter A[subscript Γ] is presented using a data sample of pp collisions, corresponding to an integrated luminosity of 1.0 fb[superscript −1], collected with the LHCb detector and recorded at the center-of-mass energy of 7 TeV at the LHC. The parameter A[subscript Γ] is the asymmetry of the effective lifetimes measured in decays of D[superscript 0] and [¯ over D][superscript 0] mesons to the CP eigenstates K[superscript −]K[superscript +] and π[superscript −]π[superscript +]. Fits to the data sample yield A[subscript Γ](KK) = (−0.35±0.62±0.12) × 10[superscript −3] and A[subscript Γ](ππ) = (0.33±1.06±0.14) × 10[superscript −3], where the first uncertainties are statistical and the second systematic. The results represent the world’s best measurements of these quantities. They show no difference in A[subscript Γ] between the two final states and no indication of CP violation.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.112.041801
