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Anomaly free Froggatt-Nielsen models of flavor

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2];  [2]
  1. Jozef Stefan Inst. (IJS), Ljubljana (Slovenia); U. Cincinnati
  2. Univ. of Cincinnati, OH (United States)
We introduce two anomaly free versions of Froggatt-Nielsen (FN) models, based on either $$G_{\rm FN}=U(1)^3$$ or $$G_{\rm FN}=U(1)$$ 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 $$G_{\rm FN}$$, are supplemented by chains of vector-like fermions charged under $$G_{\rm FN}$$. Unlike the traditional FN models the hierarchy of quark and lepton masses is obtained as an expansion in $$M/\langle \phi\rangle$$, where $$M$$ is the typical vector-like fermion mass, and $$\langle \phi\rangle$$ the flavon vacuum expectation value. The models can be searched for through deviations in flavor observables such as $$K-\bar K$$ mixing, $$\mu\to e$$ conversion, etc., where the present bounds restrict the masses of vector-like fermions to be above $${\mathcal O}(10^7~{\rm GeV})$$. If $$G_{\rm FN}$$ 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.
Research Organization:
Univ. of Cincinnati, OH (United States)
Sponsoring Organization:
Slovenian Research Agency; USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Grant/Contract Number:
SC0011784
OSTI ID:
1593764
Journal Information:
Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 10 Vol. 2019; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Chiral Froggatt-Nielsen models, gauge anomalies and flavourful axions journal January 2020
Chiral Froggatt-Nielsen models, gauge anomalies and flavourful axions text January 2020

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