Anomaly free Froggatt-Nielsen models of flavor

A bstract 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 chir...

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Bibliographic Details
Published in:	The journal of high energy physics Vol. 2019; no. 10; pp. 1 - 50
Main Authors:	Smolkovič, Aleks, Tammaro, Michele, Zupan, Jure
Format:	Journal Article
Language:	English
Published:	Berlin/Heidelberg Springer Berlin Heidelberg 17-10-2019 Springer Nature B.V Springer Berlin SpringerOpen
Subjects:	Astrophysics Beyond Standard Model Bosons Classical and Quantum Gravitation Clockwork Elementary Particles Experiments Fermions Flavor (particle physics) Gauge Symmetry High energy physics Leptons Phenomenology Physics Physics and Astronomy PHYSICS OF ELEMENTARY PARTICLES AND FIELDS Quantum Field Theories Quantum Field Theory Quantum Physics Quark Masses and SM Parameters Quarks Regular Article - Theoretical Physics Relativity Theory String Theory Symmetry Gauge Symmetry Beyond Standard Model Quark Masses and SM Parameters
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Summary:	A bstract 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 /〈 ϕ 〉, where M is the typical vector-like fermion mass, and 〈 ϕ 〉 the flavon vacuum expectation value. The models can be searched for through deviations in flavor observables such as K − K ¯ mixing, μ → 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.
Bibliography:	SC0011784; 50510; P1-0035 USDOE Office of Science (SC), High Energy Physics (HEP) Slovenian Research Agency
ISSN:	1029-8479 1029-8479
DOI:	10.1007/JHEP10(2019)188