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DOI: 10.5445/IR/1000087612
Veröffentlicht am 19.11.2018

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.

Zugehörige Institution(en) am KIT Institut für Theoretische Teilchenphysik (TTP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 1434-6044, 1434-6052
URN: urn:nbn:de:swb:90-876123
KITopen-ID: 1000087612
Erschienen in The European physical journal / C
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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