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Title: New chiral fermions, a new gauge interaction, Dirac neutrinos, and dark matter

Abstract

Here, we propose that all light fermionic degrees of freedom, including the Standard Model (SM) fermions and all possible light beyond-the-standard-model fields, are chiral with respect to some spontaneously broken abelian gauge symmetry. Hypercharge, for example, plays this role for the SM fermions. We introduce a new symmetry, U(1) ν , for all new light fermionic states. Anomaly cancellations mandate the existence of several new fermion fields with nontrivial U(1) ν charges. We develop a concrete model of this type, for which we show that (i) some fermions remain massless after U(1) ν breaking — similar to SM neutrinos — and (ii) accidental global symmetries translate into stable massive particles — similar to SM protons. These ingredients provide a solution to the dark matter and neutrino mass puzzles assuming one also postulates the existence of heavy degrees of freedom that act as “mediators” between the two sectors. The neutrino mass mechanism described here leads to parametrically small Dirac neutrino masses, and the model also requires the existence of at least four Dirac sterile neutrinos. Finally, we describe a general technique to write down chiral-fermions-only models that are at least anomaly-free under a U(1) gauge symmetry.

Authors:
 [1];  [1]
  1. Northwestern Univ., Evanston, IL (United States). Dept. of Physics & Astronomy
Publication Date:
Research Org.:
Northwestern Univ., Evanston, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1437227
Grant/Contract Number:  
FG02-91ER40684
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2015; Journal Issue: 10; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Beyond Standard Model; Cosmology of Theories beyond the SM; Neutrino Physics

Citation Formats

de Gouvea, Andre, and Hernandez, Daniel. New chiral fermions, a new gauge interaction, Dirac neutrinos, and dark matter. United States: N. p., 2015. Web. doi:10.1007/JHEP10(2015)046.
de Gouvea, Andre, & Hernandez, Daniel. New chiral fermions, a new gauge interaction, Dirac neutrinos, and dark matter. United States. doi:10.1007/JHEP10(2015)046.
de Gouvea, Andre, and Hernandez, Daniel. Wed . "New chiral fermions, a new gauge interaction, Dirac neutrinos, and dark matter". United States. doi:10.1007/JHEP10(2015)046. https://www.osti.gov/servlets/purl/1437227.
@article{osti_1437227,
title = {New chiral fermions, a new gauge interaction, Dirac neutrinos, and dark matter},
author = {de Gouvea, Andre and Hernandez, Daniel},
abstractNote = {Here, we propose that all light fermionic degrees of freedom, including the Standard Model (SM) fermions and all possible light beyond-the-standard-model fields, are chiral with respect to some spontaneously broken abelian gauge symmetry. Hypercharge, for example, plays this role for the SM fermions. We introduce a new symmetry, U(1) ν , for all new light fermionic states. Anomaly cancellations mandate the existence of several new fermion fields with nontrivial U(1)ν charges. We develop a concrete model of this type, for which we show that (i) some fermions remain massless after U(1)ν breaking — similar to SM neutrinos — and (ii) accidental global symmetries translate into stable massive particles — similar to SM protons. These ingredients provide a solution to the dark matter and neutrino mass puzzles assuming one also postulates the existence of heavy degrees of freedom that act as “mediators” between the two sectors. The neutrino mass mechanism described here leads to parametrically small Dirac neutrino masses, and the model also requires the existence of at least four Dirac sterile neutrinos. Finally, we describe a general technique to write down chiral-fermions-only models that are at least anomaly-free under a U(1) gauge symmetry.},
doi = {10.1007/JHEP10(2015)046},
journal = {Journal of High Energy Physics (Online)},
number = 10,
volume = 2015,
place = {United States},
year = {2015},
month = {10}
}

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Cited by: 11 works
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