Flavour violation with a single generation

We calculate probabilities of flavour violating processes mediated by Kalutza-Klein modes of gauge bosons in a model where three generations of the Standard Model fermions arise from a single generation in (5+1) dimensions. We discuss a distinctive feature of the model: while the processes in which the generation number G changes are strongly suppressed, the model is constrained by those with ΔG = 0, for instance K→μ±e. The bound on the size of the extra dimensions is 1/R64 TeV.