An analysis of the flavour oscillations of the charmed neutral meson is presented. The ratio of D0 → K+ π− and D0 → K− π+ decay rates is measured as a function of the decay time of the D0 meson and compared with the charge-conjugated system to search for charge-parity violation. The meson flavour at production is double-tagged by the charges of the muon and pion in the preceding anti-B → D*(2010)+ μ− X and D*(2010)+ → D0 π+ decays, respectively. These decays are selected from proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 5.4 fb^−1. The flavour oscillation parameters, relating to the differences in mass and width of the mass eigenstates, are found to be y′ = (5.8 ± 1.6) × 10^−3 and (x′)^2 = (0.0 ± 1.2) × 10^−4. No evidence for charge-parity violation is seen either in the flavour oscillations or in the decay, where the direct charge-parity asymmetry is measured to be A_D = (2.3 ± 1.7)%.

Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A.A., et al. (2025). Search for charge-parity violation in semileptonically tagged D0 → K+ π− decays. JOURNAL OF HIGH ENERGY PHYSICS, 2025(3), 0-29 [10.1007/jhep03(2025)149].

Search for charge-parity violation in semileptonically tagged D0 → K+ π− decays

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;Zenesini, F.;
2025

Abstract

An analysis of the flavour oscillations of the charmed neutral meson is presented. The ratio of D0 → K+ π− and D0 → K− π+ decay rates is measured as a function of the decay time of the D0 meson and compared with the charge-conjugated system to search for charge-parity violation. The meson flavour at production is double-tagged by the charges of the muon and pion in the preceding anti-B → D*(2010)+ μ− X and D*(2010)+ → D0 π+ decays, respectively. These decays are selected from proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 5.4 fb^−1. The flavour oscillation parameters, relating to the differences in mass and width of the mass eigenstates, are found to be y′ = (5.8 ± 1.6) × 10^−3 and (x′)^2 = (0.0 ± 1.2) × 10^−4. No evidence for charge-parity violation is seen either in the flavour oscillations or in the decay, where the direct charge-parity asymmetry is measured to be A_D = (2.3 ± 1.7)%.
2025
Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A.A., et al. (2025). Search for charge-parity violation in semileptonically tagged D0 → K+ π− decays. JOURNAL OF HIGH ENERGY PHYSICS, 2025(3), 0-29 [10.1007/jhep03(2025)149].
Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A. A.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapopoul...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1011191
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