How light the lepton flavor changing gauge bosons can be

Spontaneous breaking of inter-family (horizontal) gauge symmetries can be at the origin of the mass hierarchy between the fermion families. The corresponding gauge bosons have flavor-nondiagonal couplings which generically induce the flavor changing phenomena, and this puts strong lower limits on th...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2019-03, Vol.79 (3), p.1-10, Article 202
Main Authors: Belfatto, Benedetta, Berezhiani, Zurab
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Cosmology
Bosons
Broken symmetry
Couplings
Elementary Particles
Fermions
Flavor (particle physics)
Hadrons
Heavy Ions
Leptons
Letter
Measurement Science and Instrumentation
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
String Theory
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Summary:Spontaneous breaking of inter-family (horizontal) gauge symmetries can be at the origin of the mass hierarchy between the fermion families. The corresponding gauge bosons have flavor-nondiagonal couplings which generically induce the flavor changing phenomena, and this puts strong lower limits on the flavor symmetry breaking scales. However, for special choices of chiral horizontal symmetries the flavor changing effects can be naturally suppressed. For the sake of demonstration, we consider the case of leptonic gauge symmetry S U ( 3 ) e acting between the right-handed leptons and show that the respective gauge bosons can have mass in the TeV range, without contradicting the existing experimental limits.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-019-6724-5