2025/01/20 by LHCb Collaboration, Aaij, R., Abdelmotteleb, A. S. W. +1132 · 2 voices · 1 citation
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)
paper · doi:10.48550/arxiv.2501.11635
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 B → D*(2010)+ μ- X and D*(2010)+ → D0π+ 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 AD=(2.3±1.7) %.