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Measurement of D0-D0bar mixing parameters and search for CP violation using D0->K+pi- decays

Abstract : Measurements of charm mixing parameters from the decay-time-dependent ratio of D0->K+pi- to D0->K-pi+ 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)x10^{-5}, y'= (4.8 +- 1.0)x10^{-3}, and R_D=(3.568 +- 0.066)x10^{-3}. Allowing for CP violation, the mixing parameters are determined separately for D0 and D0bar 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, where q and p are parameters that describe the mass eigenstates of the neutral charm mesons in terms of the flavor eigenstates. This is the most precise determination of these parameters from a single experiment and shows no evidence for CP violation.
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http://hal.in2p3.fr/in2p3-00866208
Contributor : Sabine Starita <>
Submitted on : Thursday, September 26, 2013 - 11:33:55 AM
Last modification on : Tuesday, April 20, 2021 - 12:00:12 PM

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R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, et al.. Measurement of D0-D0bar mixing parameters and search for CP violation using D0->K+pi- decays. Physical Review Letters, American Physical Society, 2013, 111, pp.251801. ⟨10.1103/PhysRevLett.111.251801⟩. ⟨in2p3-00866208⟩

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