D0-D-bar 0 mixing in the presence of isosinglet quarks.


We analyse ∆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 − ¯ D 0 mixing is sufficiently enhanced to be… (More)


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