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Flavor constraints for a Vector-like quark of Nelson-Barr type

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arxiv 2103.04798 v2 pith:CD7QZSAY submitted 2021-03-08 hep-ph

A. L. Cherchiglia , G. De Conto , C. C. Nishi This is my paper · ORCID
classification hep-ph
keywords caseflavortypeconstraintsgenericnelson-barrvector-likeallowed
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abstract

The Nelson-Barr (NB) mechanism to solve the strong CP problem assumes CP conservation, arranges vanishing $\bar{\theta}$ at tree-level and requires vector-like quarks (VLQs) to transmit the CP breaking to the SM. We analyze the flavor constraints coming from the presence of one such down type VLQ of NB type by performing a global fit on the relevant flavor observables. A comparison is made to the case of one generic VLQ. We find that the allowed parameter space for the VLQ Yukawa couplings and the mixing to the SM are confined to a region much smaller than in the generic case, making the NB case falsifiable in principle.

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  1. Domain walls in Nelson-Barr axion model

    hep-ph 2024-12 conditional novelty 6.0 of 10

    The QCD instanton potential can act as a bias that collapses the domain walls of the Nelson-Barr axion, dynamically selecting the CP-conserving vacuum and yielding either dark matter or a NANOGrav-range gravitational ...

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