Measurements of charm mixing and CP violation using D0→K±π∓ decays

Abstract : Measurements of charm mixing and CP violation parameters from the decay-time-dependent ratio of D0→K+π− to D0→K−π+ decay rates and the charge-conjugate ratio are reported. The analysis uses B¯¯¯¯→D∗+μ−X, and charge-conjugate decays, where D∗+→D0π+, and D0→K∓π±. The pp collision data are recorded by the LHCb experiment at center-of-mass energies s√ = 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1. The data are analyzed under three hypotheses: (i) mixing assuming CP symmetry, (ii) mixing assuming no direct CP violation in the Cabibbo-favored or doubly Cabibbo-suppressed decay amplitudes, and (iii) mixing allowing either direct CP violation and/or CP violation in the superpositions of flavor eigenstates defining the mass eigenstates. The data are also combined with those from a previous LHCb study of D0→Kπ decays from a disjoint set of D∗+ candidates produced directly in pp collisions. In all cases, the data are consistent with the hypothesis of CP symmetry.
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Submitted on : Monday, December 5, 2016 - 2:49:35 PM
Last modification on : Monday, June 3, 2019 - 1:38:03 PM

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R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Measurements of charm mixing and CP violation using D0→K±π∓ decays. Physical Review D, American Physical Society, 2017, 95, pp.052004 ⟨10.1103/PhysRevD.95.052004⟩. ⟨in2p3-01408895⟩

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