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High Energy Physics - Phenomenology

arXiv:2304.06078 (hep-ph)
[Submitted on 12 Apr 2023]

Title:Explicit parametrization of more than one vector-like quark of Nelson-Barr type

Authors:G. H. S. Alves, A. L. Cherchiglia, C. C. Nishi
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Abstract:Nelson-Barr models solve the strong CP problem based on spontaneous CP violation and generically requires vector-like 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-type or up-type and quantitatively study several aspects including the hierarchy of the VLQ Yukawas and their irreducible contribution to $\bar{\theta}$. 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 $\bar{\theta}$, although this case had been previously shown to be very restricted based on estimates.
Subjects: High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:2304.06078 [hep-ph]
  (or arXiv:2304.06078v1 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.2304.06078
Related DOI: https://doi.org/10.1103/PhysRevD.108.035049

Submission history

From: Adriano Lana Cherchiglia [view email]
[v1] Wed, 12 Apr 2023 18:00:05 UTC (7,066 KB)
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