Measurement of D[superscript 0]–[line over D][subscript 0] Mixing Parameters and Search for CP Violation Using D[subscript 0] → K[subscript +]π[subscript -] Decays
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Aaij-2013-Measurement of D-0-(.pdf
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Author(s)
Williams, Michael
Date Issued
December 2013
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. “Measurement of D[superscript 0]–[line over D][subscript 0] Mixing Parameters and Search for CP Violation Using D[subscript 0] → K[subscript +]π[subscript -] Decays.” Physical Review Letters 111, no. 25 (December 2013). © 2013 CERN, for the LHCb Collaboration
Version
Final published version
Abstract
Measurements of charm mixing parameters from the decay-time-dependent ratio of D[superscript 0] → K[superscript +]π[superscript −] to D[superscript 0] → K[superscript −]π[superscript +] rates and the charge-conjugate ratio are reported. The analysis uses data, corresponding to 3 fb[superscript −1] of integrated luminosity, from proton-proton collisions at 7 and 8 TeV center-of-mass energies recorded by the LHCb experiment. In the limit of charge-parity (CP ) symmetry, the mixing parameters are determined to be x[superscript '2] = (5.5 ± 4.9) × 10[superscript −5], y[superscript ′] = (4.8 ± 1.0) × 10[superscript −3], and R[subscript D] = (3.568 ± 0.066) × 10[superscript −3]. Allowing for CP violation, the measurement is performed separately for D[superscript 0] and [line over D][superscript 0] mesons yielding A[subscript D] = (−0.7 ± 1.9)%, for the direct CP-violating asymmetry, and 0.75 < |q/p| < 1.24 at the 68.3% confidence level, for the parameter describing CP violation in mixing. This is the most precise determination of these parameters from a single experiment and shows no evidence for 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.111.251801
