# $D^0 - ar D^0$ Mixing in the Presence of Isosinglet Quarks

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We analyse $\Delta C=2$ transitions in the framework of a minimal extension of the Standard Model where either a $Q=2-3$ or a $Q=-1-3$ isosinglet quark is added to the standard quark spectrum. In the case of a $Q=2-3$ isosinglet quark, it is shown that there is a significant region of parameter space where $D^0 - \bar D^0$ mixing is sufficiently en

Autor: G. C. Branco; P. A. Parada; M. N. Rebelo

Fuente: https://archive.org/