Explicit parametrization of more than one vectorlike quark of Nelson-Barr type
Metadatos
Mostrar el registro completo del ítemEditorial
American Physical Society
Fecha
2023-08-23Referencia bibliográfica
G. H. S. Alves, A. L. Cherchiglia, and C. C. Nishi. Explicit parametrization of more than one vectorlike quark of Nelson-Barr type. Phys. Rev. D 108, 035049. [https://doi.org/10.1103/PhysRevD.108.035049]
Patrocinador
Fundação de Amparo à Pesquisa do Estado de São Paulo 2014/19164-6, 312866/2022-4 FAPESP; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior CAPES; Conselho Nacional de Desenvolvimento Científico e Tecnológico 166523/2020-8, 201013/2022-3 CNPqResumen
Nelson-Barr models solve the strong CP problem based on spontaneous CP violation and generically require vectorlike quarks (VLQs) mixing with standard quarks to transmit the CP violation. We devise an explicit parametrization for the case of two VLQs of either down or up type and quantitatively study several aspects including the hierarchy of the VLQ Yukawas and their irreducible contribution to θ¯. In particular, with the use of the parametrization, we show that a big portion of the parameter space for two up-type VLQs at the TeV scale is still allowed by the constraint on θ¯, although this case had been previously shown to be very restricted based on estimates.