First Observation of D0-D0bar Oscillations in D0K+π-π+π- Decays and Measurement of the Associated Coherence Parameters.

R Aaij, Marco Adinolfi, Nick Brook, Emma Buchanan, Andrew Cook, Matthew Coombes, Jeremy Dalseno, Sam Harnew, Paras Naik, Konstantinos Petridis, Eugenia Price, Claire Prouve, Renato Quagliani, Sophie Richards, Daniel Saunders, Nicola Skidmore, Daniel Souza Covacich, Jaap Velthuis, David Voong, LHCb Collaboration

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Charm meson oscillations are observed in a time-dependent analysis of the ratio of D0K+π-π+π- to D0K-π+π-π+ decay rates, using data corresponding to an integrated luminosity of 3.0 fb-1 recorded by the LHCb experiment. The measurements presented are sensitive to the phase-space averaged ratio of doubly Cabibbo-suppressed to Cabibbo-favoured amplitudes rDK3π and the product of the coherence factor RDK3π and a charm mixing parameter y'K3π. The constraints measured are rDK3π=(5.67 ± 0.12) × 10-2, which is the most precise determination to date, and RDK3π · y'K3π = (0.3 ± 1.8) × 10-3, which provides useful input for determinations of the CP-violating phase γ in B±DK±, D0K+π-π+π- decays.  The analysis also gives the most precise measurement of the D0K+π-π+π- branching fraction, and the first observation of D0-D0bar oscillations in this decay mode, with a significance of 8.2 standard deviations.
Original languageEnglish
Article number241801
Number of pages10
JournalPhysical Review Letters
Issue number24
Publication statusPublished - 17 Jun 2016

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