Measurement of D-0-(D)over-bar(0) Mixing Parameters and Search for CP Violation Using D-0 -> K+ pi(-) Decays

Measurements of charm mixing parameters from the decay-time-dependent ratio of D0→K ⁺π ^- to D0→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 R _D=(3.568±0.066)×10 ^-3. Allowing for CP violation, the measurement is performed separately for D0 and D ^̄0 mesons yielding A _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.