WHen CP violation occurs, the quarks in the proton and neutron can change into strange quarks through a change of state in the color force. This could cause a D-meson to form. The D-Meson can decay into Kaons, then to pions, then to muons, then to electrons.
The D mesons are the lightest particle containing charm quarks. They are often studied to gain knowledge on the weak interaction. 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 and pions.
Published by Leif Holmlid
Total rate estimation
10e7-10e10 s-1
DN(0) →···→···→ K± → π± → μ± → e±
Nx4x938MeV →···→···→ 493MeV → 139MeV → 105MeV → 0. 511MeV
See
http://hyperphysics.phy-astr.g…ase/particles/dmeson.html
An interesting example of a particle interaction which involves the D meson was observed in a bubble chamber at SLAC in 1982 (K. Abe et al., Phys. Rev. Lett. 48,1526 (1982)). Photons at about 20 GeV were produced by Compton scattering of radiation from a YAG laser from energetic electrons from the linear accelerator. The interaction is sketched from the bubble chamber photograph. The presumption is that the photon interacted with a proton, producing the D mesons indicated. The reaction which produced these products would appear to be the following.
Here two D mesons were produced. Holmlid specifies 4 mesons are produced.
