Abstract
Charm meson oscillations are observed in a time-dependent analysis of the ratio of to decay rates, using data corresponding to an integrated luminosity of recorded by the LHCb experiment. The measurements presented are sensitive to the phase-space averaged ratio of doubly Cabibbo-suppressed to Cabibbo-favored amplitudes and the product of the coherence factor and a charm mixing parameter . The constraints measured are , which is the most precise determination to date, and , which provides useful input for determinations of the CP-violating phase in , decays. The analysis also gives the most precise measurement of the branching fraction, and the first observation of – oscillations in this decay mode, with a significance of 8.2 standard deviations.
- Received 24 February 2016
DOI:https://doi.org/10.1103/PhysRevLett.116.241801
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© 2016 CERN, for the LHCb Collaboration