| |
Record |
Links |
|
Author  |
Centelles Chulia, S.; Herbermann, T.; Herrero-Brocal, A.; Vicente, A. |
|
| |
Title |
Flavour and cosmological probes of Diracon models |
Type |
Journal Article |
| |
Year |
2025 |
Publication |
Journal of High Energy Physics |
Abbreviated Journal |
J. High Energy Phys. |
|
| |
Volume |
09 |
Issue |
9 |
Pages |
110 - 36pp |
|
| |
Keywords |
Cosmology of Theories BSM; Early Universe Particle Physics; Lepton Flavour Violation (charged); New Light Particles |
|
| |
Abstract |
We present and analyze two minimal extensions of the Standard Model featuring a spontaneously broken global, chiral, and anomaly-free U(1)D symmetry. This breaking generates naturally small Dirac neutrino masses via a seesaw mechanism and yields a physical massless Goldstone boson, the Diracon. Although both models share the same particle content and scalar potential, their distinct symmetry breaking pattern leads to remarkably different phenomenological and cosmological signatures. In the first model, the Diracon couples weakly to charged leptons but right-handed neutrinos can be efficiently produced in the early Universe, resulting in stringent constraints from the effective number of relativistic species, triangle Neff. Conversely, in the second one, right-handed neutrino production is suppressed, and flavour-violating processes such as μ-> eD\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \mu \to e\mathcal{D} $$\end{document} provide the most promising probes. These simple but elegant models showcase the complementarity between cosmological observations and low-energy flavour experiments in the search for physics beyond the Standard Model. |
|
| |
Address |
[Chulia, Salvador Centelles; Herbermann, Tim] Max Planck Inst Kernphys, Saupfercheckweg 1, D-69117 Heidelberg, Germany, Email: salcen@ific.uv.es; |
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
Springer |
Place of Publication |
|
Editor |
|
|
| |
Language |
English |
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
|
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
WOS:001570402700001 |
Approved |
no |
|
| |
Is ISI |
yes |
International Collaboration |
yes |
|
| |
Call Number |
IFIC @ pastor @ |
Serial |
6844 |
|
| Permanent link to this record |
