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We study D0-D0 mixing in the presence of a fourth generation of quarks. Inparticular, we calculate the size of the allowed CP violation which is found atthe observable level well beyond anything possible with CKM dynamics. Wecalculate the semileptonic asymmetry a_SL and the mixing induced CP asymmetryeta_fS_f which are correlated with each other. We also investigate thecorrelation of eta_fS_f with a number of prominent observables in other mesonicsystems like epsilon'/epsilon, Br(K_L -> pi0 nu nu), Br(K+ -> pi+ nu nu),Br(B_s ->mu+ mu-), Br(B_d -> mu+ mu-) and finally S_psi phi in the B_s system.We identify a clear pattern of flavour and CP violation predicted by the SM4model: While simultaneous large 4G effects in the K and D systems are possible,accompanying large NP effects in the B_d system are disfavoured. However thisbehaviour is not as pronounced as found for the LHT and RSc models. In contrastto this, sizeable CP violating effects in the B_s system are possible unlessextreme effects in eta_fS_f are found, and Br(B_s ->mu+ mu-) can be stronglyenhanced regardless of the situation in the D system. We find that, on theother hand, S_psi phi > 0.2 combined with the measured epsilon'/epsilonsignificantly diminishes 4G effects within the D system.

The Impact of a 4th Generation on Mixing and CP Violation in the Charm System