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The branching ratio of the rare decay B->X_s gamma provides potentiallystrong constraints on models beyond the Standard Model. Considering a generalscenario with new heavy neutral gauge bosons, present in particular in Z' andgauge flavour models, we point out two new contributions to the B->X_s gammadecay. The first one originates from one-loop diagrams mediated by gauge bosonsand heavy exotic quarks with electric charge -1/3. The second contributionstems from the QCD mixing of neutral current-current operators generated byheavy neutral gauge bosons and the dipole operators responsible for the B->X_sgamma decay. The latter mixing is calculated here for the first time. Wediscuss general sum rules which have to be satisfied in any model of this type.We emphasise that the neutral gauge bosons in question could also significantlyaffect other fermion radiative decays as well as non-leptonic two-body Bdecays, epsilon'/epsilon, anomalous (g-2)_mu and electric dipole moments.

The Impact of Flavour Changing Neutral Gauge Bosons on B->X_s gamma