Physics PAN Seminar: Anomaly free Froggatt-Nielsen models of flavor
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Detroit, MI 48201
Speaker: Prof. Jure Zupan
Affiliation: University of Cincinnati
Abstract: We introduce two anomaly free versions of Froggatt-Nielsen (FN) models, based on either G_FN=U(1)^3 or G_FN}=U(1) horizontal symmetries, that generate the SM quark and lepton flavor structures. The structure of these ``inverted'' FN models is motivated by the clockwork mechanism: the chiral fields, singlets under G_FN, are supplemented by chains of vector-like fermions charged under G_FN. Unlike the traditional FN models the hierarchy of quark and lepton masses is obtained as an expansion in M/phi, where M is the typical vector-like fermion mass, and phi the flavon vacuum expectation value. The models can be searched for through deviations in flavor observables such as K-Kbar mixing, mu to e conversion, etc., where the present bounds restrict the masses of vector-like fermions to be above O(10^7 GeV). If G_FN is gauged, the models can also be probed by searching for the flavorful Z' gauge bosons. In principle, the Z's can be very light, and can be searched for using precision flavor, astrophysics, and beam dump experiments.