An analysis of the flavour oscillations of the charmed neutral meson is presented. The ratio of D0 -> K+pi- and D0 -> K-pi+ 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 B-->D*2010+mu-X and D*(2010)+ -> D0pi+ 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 \pm 1.6) x 10-3 and (x')2 = (0.0 \pm 1.2) x 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 AD = (2.3 \pm 1.7) %.

Search for charge-parity violation in semileptonically tagged D0-> K+pi- decays

Bassi G.
Membro del Collaboration Group
;
Kleijne N.
Membro del Collaboration Group
;
Morello M. J.
Membro del Collaboration Group
;
Passaro D.
Membro del Collaboration Group
;
Pica L.
Membro del Collaboration Group
;
Riccardi D.
Membro del Collaboration Group
;
2025

Abstract

An analysis of the flavour oscillations of the charmed neutral meson is presented. The ratio of D0 -> K+pi- and D0 -> K-pi+ 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 B-->D*2010+mu-X and D*(2010)+ -> D0pi+ 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 \pm 1.6) x 10-3 and (x')2 = (0.0 \pm 1.2) x 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 AD = (2.3 \pm 1.7) %.
2025
Settore FIS/01 - Fisica Sperimentale
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
Charm Physics; CP Violation; Hadron-Hadron Scattering; Oscillation
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/153964
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