Measurements of charm mixing and violation using decays

Journal article

Measurements of charm mixing and CP violation parameters from the decay-time-dependent ratio of D⁰K+π- to D⁰K-π+ decay rates and the charge-conjugate ratio are reported. The analysis uses &Bmacr;D^*+μ-X, and charge-conjugate decays, where D^*+D⁰π+, and D⁰K∓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 D⁰Kπ 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.

Authors: Aaij, R; Adeva, B; Adinolfi, M; Ajaltouni, Z; Akar, S

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Physical Society
• Journal: Physical Review D
• Volume: 95
• Issue: 5
• Pages: 052004
• Publication date: 2017-03-23
• Acceptance date: 2017-02-22
• DOI: 10.1103/PhysRevD.95.052004
• EISSN: 2470-0029
• ISSN: 2470-0010
• Keywords: hep-ex