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Measurement of Dº-D-º mixing parameters and search for CP violation using Dº → K+ π- decays
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LHCb Collaboration (Including: Back, J. J., Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte, Whitehead, M. (Mark) and Williams, M. P.). (2013) Measurement of Dº-D-º mixing parameters and search for CP violation using Dº → K+ π- decays. Physical Review Letters, 111 (25). 251801. doi:10.1103/PhysRevLett.111.251801 ISSN 0031-9007.
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WRAP_LCHb_e251801.pdf - Published Version Available under License Creative Commons Attribution. Download (394Kb) | Preview |
Official URL: http://dx.doi.org/10.1103/PhysRevLett.111.251801
Abstract
Measurements of charm mixing parameters from the decay-time-dependent ratio of Dº → K+ π- to Dº → K- π+ rates and the charge-conjugate ratio are reported. The analysis uses data, corresponding to 3 fb−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'2=(5.5±4.9)×10−5, y′=(4.8±1.0)×10−3, and RD=(3.568±0.066)×10−3. Allowing for CP violation, the measurement is performed separately for D0 and D¯¯¯0 mesons yielding AD=(−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.
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