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 y_CP^ππ − y_CP^Kπ and y_CP^KK − y_CP^Kπ, and are measured as y_CP^ππ − y_CP^Kπ = (6.57 ± 0.53 ± 0.16) × 10^−3, y_CP^KK − y_CP^Kπ = (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 y_CP − y_CP^Kπ = (6.96 ± 0.26 ± 0.13) × 10^−3, which is four times more precise than the previous world average.

Measurement of the charm mixing parameter yCP − y_CP^Kπ Using Two-Body D0 Meson Decays

Calabrese, R.;Capriotti, L.;Fiorini, M.;Franzoso, E.;Giugliano, C.;Guarise, M.;Kotriakhova, S.;Luppi, E.;Okamura, S.;Pappalardo, L. L.;Passalacqua, B.;Tomassetti, L.;
2022

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 y_CP^ππ − y_CP^Kπ and y_CP^KK − y_CP^Kπ, and are measured as y_CP^ππ − y_CP^Kπ = (6.57 ± 0.53 ± 0.16) × 10^−3, y_CP^KK − y_CP^Kπ = (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 y_CP − y_CP^Kπ = (6.96 ± 0.26 ± 0.13) × 10^−3, which is four times more precise than the previous world average.
2022
Aaij, R.; Abdelmotteleb, A. S. W.; Abellán Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Agapopoulou, C.; Aidala, C...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2500459
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