Heavy-meson physics and flavour violation with a single generation

We study flavour-violating processes which involve heavy B-and D-mesons and are mediated by Kaluza-Klein modes of gauge bosons in a previously suggested model where three generations of the Standard Model fermions originate from a single generation in six dimensions. We find the bound on the size R of the extra spatial dimensions 1/R greater than or similar to 3.3 TeV, which arises from the three-body decay B-s(0) -> K mu e. Due to the still too low statistics this bound is much less stringent than the constraint arising from K -> mu e, 1/R greater than or similar to 64 TeV, which was found in a previous work [1]. Nevertheless, we argue that a clear signature of the model would be an observation of K -> mu e and B-s(0) -> K mu e decays without observations of other flavour and lepton number changing processes at the same precision level.