Since the D mesons are the lightest mesons containing a single charm quark (or antiquark), they must change the charm (anti)quark into an (anti)quark of another type to decay. Such transitions involve a change of the internal charm quantum number, and can take place only via the weak interaction. In D mesons, the charm quark preferentially changes into a strange quark via an exchange of a W particle, therefore the D meson preferentially decays into kaons ( K ) and pions ( π ).
‡ ^ PDG reports the resonance width Here the conversion is given instead.
D – D oscillationsEdit
In 2021 it was confirmed with a significance of more than seven standard deviations, that the neutral D0 meson spontaneously transforms into its own antiparticle and back. This phenomenon is called flavor oscillation and was prior known to exist in the neutral B mesons.
^Aaij, R.; et al. (LHCb collaboration) (14 September 2021) [7 June 2021]. "Observation of the mass difference between neutral charm-meson eigenstates". Physical Review Letters. 127 (11): 111801. arXiv:2106.03744. Bibcode:2021PhRvL.127k1801A. doi:10.1103/PhysRevLett.127.111801. PMID34558945. S2CID 235358523. 2106.03744. Published 2021 in Physical Review Letters127, 111801. Report numbers: LHCb-PAPER-2021-009, CERN-EP-2021-099.