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A grand-unified Nelson–Barr model

Schwichtenberg, Jakob; Tremper, Paul; Ziegler, Robert

We argue that the Nelson–Barr solution to the Strong CP Problem can be naturally realized in an E₆ grand-unified theory. The chiral SM fermions reside in three generations of E₆ fundamentals together with heavy vectorlike down quarks, leptons doublets and right-handed neutrinos. CP is imposed on the Lagrangian and broken only spontaneously at high scales, leading to a mixing between chiral and vectorlike fields that allows to solve the Strong CP Problem through the Nelson–Barr mechanism. The main benefit of the E₆ GUT structure is the predictivity in the SM fermion sector, and a perfect fit to all SM observables can be obtained despite being over-constrained. Definite predictions are made for the neutrino sector, with a Dirac CP phase that is correlated to the CKM phase, allowing to test this model in the near future.

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Verlagsausgabe §
DOI: 10.5445/IR/1000087612
Veröffentlicht am 19.11.2018
DOI: 10.1140/epjc/s10052-018-6388-6
Zitationen: 4
Web of Science
Zitationen: 3
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theoretische Teilchenphysik (TTP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 11.2018
Sprache Englisch
Identifikator ISSN: 1434-6044, 1434-6052
KITopen-ID: 1000087612
Erschienen in The European physical journal / C
Verlag Springer Verlag
Band 78
Heft 11
Seiten Article: 910
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Vorab online veröffentlicht am 10.11.2018
Nachgewiesen in Web of Science
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