# Measurement of the charm mixing parameter y(CP)-y(CP)(K pi) using two-body D-0 meson decays

Aaij, R, Abdelmotteleb, ASW, Beteta, C Abellan, Abudinen, F, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Agapopoulou, C, Aidala, CA
et al (show 998 more authors) (2022) Measurement of the charm mixing parameter y(CP)-y(CP)(K pi) using two-body D-0 meson decays. PHYSICAL REVIEW D, 105 (9).

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## Abstract

A measurement of the ratios of the effective decay widths of D0→π-π+ and D0→K-K+ decays over that of D0→K-π+ decays is performed with the LHCb experiment using proton-proton collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb-1. These observables give access to the charm mixing parameters yCPππ-yCPKπ and yCPKK-yCPKπ, and are measured as yCPππ-yCPKπ=(6.57±0.53±0.16)×10-3, yCPKK-yCPKπ=(7.08±0.30±0.14)×10-3, where the first uncertainties are statistical and the second systematic. The combination of the two measurements is yCP-yCPKπ=(6.96±0.26±0.13)×10-3, which is four times more precise than the previous world average.

Item Type: Article Faculty of Science and Engineering > School of Physical Sciences Symplectic Admin 31 Aug 2022 10:19 18 Jan 2023 20:46 10.1103/PhysRevD.105.092013 https://journals.aps.org/prd/pdf/10.1103/PhysRevD.... https://livrepository.liverpool.ac.uk/id/eprint/3162849