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.

Aaij, R., Abdelmotteleb, A., Abellán Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2022). Measurement of the Charm Mixing Parameter y_CP − y_CP^Kπ Using Two-Body D0 Meson Decays. PHYSICAL REVIEW D, 105(9), 1-17 [10.1103/PhysRevD.105.092013].

Measurement of the Charm Mixing Parameter y_CP − y_CP^Kπ Using Two-Body D0 Meson Decays

Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Maccolini, S.;Manuzzi, D.;Patrignani, C.;Villa, A.;Zucchelli, S.;
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., Abellán Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2022). Measurement of the Charm Mixing Parameter y_CP − y_CP^Kπ Using Two-Body D0 Meson Decays. PHYSICAL REVIEW D, 105(9), 1-17 [10.1103/PhysRevD.105.092013].
Aaij, R.; Abdelmotteleb, A.S.W.; Abellán Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Agapopoulou, C.; Aidala, C.A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/900420
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