  We study radion phenomenology in an warped extra-dimension scenario with
Standard Model fields in the bulk, with and without an additional fourth family
of fermions. The radion couplings with the fermions will be generically
misaligned with respect to the Standard Model fermion mass matrices, therefore
producing some amount of flavor violating couplings and potentially influencing
production and decay rates of the radion. Simple analytic expressions for the
radion-fermion couplings are obtained with three or four families. We also
update and analyze the current experimental limits on radion couplings and on
the model parameters, again with both three and four families scenarios. We
finally present the modified decay branching ratios of the radion with an
emphasis on the new channels involving flavor diagonal and flavor violating
decays into fourth generation quarks and leptons.
