Nelson-Barr models with vector-like quark doublets suppress hadronic CP violation to three loops via an accidental symmetry in the renormalizable theory, yielding phenomenologically viable solutions distinct from singlet-based models.
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In minimal benchmarks with a vector-like down quark D and singlet scalar, the new-physics contribution to B to X_s gamma is only 0.4 percent of the Standard Model value at TeV scales, while B_s mixing imposes stronger limits on the complex-scalar case.
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Nelson-Barr Models with Vector-Like Quark Doublets
Nelson-Barr models with vector-like quark doublets suppress hadronic CP violation to three loops via an accidental symmetry in the renormalizable theory, yielding phenomenologically viable solutions distinct from singlet-based models.
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Real and Complex Singlet-Scalar Benchmarks with a Vector-Like Down Quark for $B\to X_s\gamma$ and $B_s-\bar B_s$ Mixing
In minimal benchmarks with a vector-like down quark D and singlet scalar, the new-physics contribution to B to X_s gamma is only 0.4 percent of the Standard Model value at TeV scales, while B_s mixing imposes stronger limits on the complex-scalar case.