Seesaw limit of the Nelson-Barr mechanism

Year: 2024

Type: article

Abstract: We investigate how the solution to the strong CP problem and the explanation for the observed fermion mass hierarchies can be intrinsically related. Specifically, we explore the Nelson-Barr mechanism and identify its “seesaw limit”, where light quark masses are suppressed by large CP-violating terms. Upon adding three (two) vector-like quarks that mix with the down-type (up-type) quark sector of the Standard Model, we demonstrate how the lack of CP violation in the strong sector and the observed quark mass hierarchy can be simultaneously achieved.

Source: Physics Letters B

DOI: 10.1016/j.physletb.2024.139222

Authors: A.L. Cherchiglia, A.G. Dias, J. Leite, C.C. Nishi

Institutions: Universidade Estadual de Campinas (UNICAMP), Universidade Federal do ABC, Consejo Superior de Investigaciones Científicas, Universitat de València, Parc Científic de la Universitat de València, Instituto de Física Corpuscular

Language: English

Topic: Particle physics theoretical and experimental studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funders: Fundação de Amparo à Pesquisa do Estado de São Paulo, Generalitat Valenciana, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Agencia Estatal de Investigación

OpenAlex ID: W4405847369