D0−D0 mixing in the weak-gauged U(4)L⊗U(4)R chiral lagrangian model

The D0–D0 mixing is analyzed in a weak gauged U(4)L⊗U(4)R chiral lagrangian model where the electroweak interaction is introduced as a gauge theory over the meson degrees of freedom. This model allows a particular realization of the G.I.M. mechanism and then could be useful in the study of processes where G.I.M. suppression is effective. As a test of the model we have also analyzed the K0–K0 mixing. We find ΔmK in good agreement with the experimental result and we show that the D0–D0 mixing is very much suppressed in agreement with previous estimates in the Heavy Quark expansion framework.