Cosmological constraints on light flavons

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http://hdl.handle.net/10138/304629

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Heikinheimo , M , Huitu , K , Keus , V & Koivunen , N 2019 , ' Cosmological constraints on light flavons ' , Journal of High Energy Physics , no. 6 , 065 . https://doi.org/10.1007/JHEP06(2019)065

Title: Cosmological constraints on light flavons
Author: Heikinheimo, Matti; Huitu, Katri; Keus, Venus; Koivunen, Niko
Contributor: University of Helsinki, Particle Physics and Astrophysics
University of Helsinki, Department of Physics
University of Helsinki, Particle Physics and Astrophysics
University of Helsinki, Helsinki Institute of Physics
Date: 2019-06-14
Language: eng
Number of pages: 19
Belongs to series: Journal of High Energy Physics
ISSN: 1029-8479
URI: http://hdl.handle.net/10138/304629
Abstract: The Froggatt-Nielsen mechanism is a well-motivated framework for generating the fermion mass hierarchy. This mechanism introduces flavons, complex scalars which are singlet under the Standard Model gauge symmetry and charged under a new global family symmetry. We make use of a leptophilic flavon to produce the charged lepton Yukawa matrix. The real part of the flavon mixes with the Higgs boson and introduces lepton flavour violating interactions which are bounded by experiment. The imaginary part of the flavon, , is a long-lived light particle, whose abundance is restricted by cosmological observations. For m<2m(e) where the decay of to charged leptons is kinematically forbidden, we identify allowed regions of m with respect to the vacuum expectation value of the flavon field where all experimental and cosmological constraints are satisfied.
Subject: Beyond Standard Model
Cosmology of Theories beyond the SM
Global Symmetries
SEARCH
115 Astronomy, Space science
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