Neutrino mass generation and leptogenesis via pseudo-Nambu-Goldstone Higgs portal

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http://hdl.handle.net/10138/228973

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Alanne , T , Meroni , A & Tuominen , K 2017 , ' Neutrino mass generation and leptogenesis via pseudo-Nambu-Goldstone Higgs portal ' , Physical Review D , vol. 96 , no. 9 , 095015 . https://doi.org/10.1103/PhysRevD.96.095015

Title: Neutrino mass generation and leptogenesis via pseudo-Nambu-Goldstone Higgs portal
Author: Alanne, Tommi; Meroni, Aurora; Tuominen, Kimmo
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
Date: 2017-11-16
Language: eng
Number of pages: 10
Belongs to series: Physical Review D
ISSN: 2470-0010
URI: http://hdl.handle.net/10138/228973
Abstract: We consider an extension of the Standard Model with the global symmetry-breaking pattern SO(5)/SO(4), where the Higgs boson arises as a pseudo-Nambu-Goldstone boson. The scalar content of the theory consists of a Standard-Model-like Higgs field and an extra real scalar field. The flavor sector of the model is extended by two right-handed neutrinos compatible with the observed light-neutrino phenomenology, and we find that the correct vacuum alignment determines the mass of the heavier neutrino eigenstate to be around 80 TeV. The new singlet-scalar state generates dynamically a Majorana mass term for the heavy-neutrino states. We show how the model leads to the correct baryon asymmetry of the Universe via leptogenesis in the case of two degenerate or hierarchical heavy neutrinos.
Subject: DARK-MATTER
RESONANT LEPTOGENESIS
NON-CONSERVATION
CP-VIOLATION
BARYOGENESIS
UNIVERSE
NUMBER
VMSM
114 Physical sciences
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