The minimal axion minimal linear σ model
Entity
Instituto de Física Teórica (IFT); UAM. Departamento de Física TeóricaPublisher
Springer Verlag (Germany)Date
2018-05-01Citation
10.1140/epjc/s10052-018-5892-z
European Physical Journal C 78.5 (2018): 415
ISSN
1434-6044 (print); 1434-6052 (online)DOI
10.1140/epjc/s10052-018-5892-zFunded by
The authors acknowledge partial financial support by the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant agreements No 690575 and No 674896. L.M. acknowledges partial financial support by the Spanish MINECO through the “Ramón y Cajal” programme (RYC-2015- 17173), and by the Spanish “Agencia Estatal de Investigación” (AEI) and the EU “Fondo Europeo deDesarrollo Regional” (FEDER) through the project FPA2016-78645-P, and through the Centro de excelencia Severo Ochoa Program under Grant SEV-2016-0597Project
Gobierno de España. RYC-2015-17173; Gobierno de España. FPA2016-78645-P; Gobierno de España. SEV-2016-0597; EC/H2020/690575/EU//Marie Sklodowska-Curie; EC/H2020/674896/EU//Marie Sklodowska-CurieEditor's Version
https://doi.org/10.1140/epjc/s10052-018-5892-zSubjects
Minimal linear; Linear σ model; Axion; Scalar potential; FísicaRights
© 2018, The Author(s)Abstract
The minimal SO(5) / SO(4) linear σ model is extended including an additional complex scalar field, singlet under the global SO(5) and the Standard Model gauge symmetries. The presence of this scalar field creates the conditions to generate an axion à la KSVZ, providing a solution to the strong CP problem, or an axion-like-particle. Different choices for the PQ charges are possible and lead to physically distinct Lagrangians. The internal consistency of each model necessarily requires the study of the scalar potential describing the SO(5) → SO(4) , electroweak and PQ symmetry breaking. A single minimal scenario is identified and the associated scalar potential is minimised including counterterms needed to ensure one-loop renormalizability. In the allowed parameter space, phenomenological features of the scalar degrees of freedom, of the exotic fermions and of the axion are illustrated. Two distinct possibilities for the axion arise: either it is a QCD axion with an associated scale larger than ∼ 105TeV and therefore falling in the category of the invisible axions; or it is a more massive axion-like-particle, such as a 1 GeV axion with an associated scale of ∼ 200 TeV, that may show up in collider searches.
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Google Scholar:Merlo, Luca
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Pobbe, F.
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Rigolin, Stefano
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