Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Consequences of vector-like quarks of Nelson-Barr type   The Nelson-Barr mechanism to solve the strong CP problem requires vector-like
quarks (VLQs) to transmit the spontaneous CP breaking to the SM. We study the
scenario where only these VLQs are within reach at the TeV scale while the
spontaneous CP breaking sector is inaccessible. We investigate how these VLQs
of Nelson-Barr type differ from generic VLQs and find from parameter counting
that one less parameter is needed. In particular, for one VLQ of Nelson-Barr
type, there is only one CP odd quantity that is responsible for all CP
violation. In this case, we solve the technical problem of parametrizing only
the new physics parameters while keeping the SM parameters as independent
inputs. For one down-type VLQ, the model is largely flavor safe because the VLQ
couplings to the SM up quarks and the $W$ are hierarchically smaller for
lighter quarks.

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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: hep-th
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The categories of this paper are: alg-geom
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: q-alg
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The categories of this paper are: cs
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The categories of this paper are: cond-mat
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The categories of this paper are: math
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol