Fermion masses, mixings and proton decay in a Randall-Sundrum model

We consider a Randall-Sundrum model in which the Standard Model fermions an d gauge bosons correspond to bulk fields. We show how the observed charged fermion masses and CKM mixings can be explained, without introducing hierar chical Yukawa couplings. We then study the impact on the mass scales associ ated with non-renormalizable operators responsible for proton decay, neutri no masses, and flavor changing neutral currents. Although mass scales as hi gh as 10(11)-10(12) GeV are in principle possible, dimensionless couplings of order 10(-8) are still needed to adequately suppress proton decay. Large neutrino mixings seem to require new physics beyond the Standard Model. (C ) 2001 Published by Elsevier Science B.V.