Explicit parametrization of more than one vectorlike quark of Nelson-Barr type Silva Alves, Gustavo Henrique Cherchiglia, Adriano L. Nishi, Celso C. G. H. S. A. acknowledges financial support by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001. A. C. acknowledges support from National Council for Scientific and Technological Development—CNPq through projects 166523/2020-8 and 201013/2022-3. C. C. N. acknowledges partial support by Brazilian FAPESP Grant No. 2014/19164-6 and CNPq Grant No. 312866/2022-4. 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. 2023-11-02T12:58:37Z 2023-11-02T12:58:37Z 2023-08-23 info:eu-repo/semantics/article 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] https://hdl.handle.net/10481/85423 10.1103/PhysRevD.108.035049 eng http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Atribución 4.0 Internacional American Physical Society