Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Indirect Signs of the Peccei-Quinn Mechanism   In the Standard Model, the renormalization of the QCD vacuum angle $\theta$
is extremely tiny, and small $\theta$ is technically natural. In the general
Standard Model effective field theory (SMEFT), however, $\Delta\theta$ is
quadratically divergent, reflecting the fact that new sources of hadronic
CP-violation typically produce $\mathcal O(1)$ threshold corrections to
$\theta$. The observation of such CP-violating interactions would therefore be
in tension with solutions to the strong CP problem in which $\theta=0$ is an
ultraviolet boundary condition, pointing to the Peccei-Quinn mechanism as the
explanation for why $\theta$ is small in the infrared. We study the quadratic
divergences in $\theta$ arising from dimension-6 SMEFT operators and discuss
the discovery prospects for these operators at electric dipole moment
experiments, the LHC, and future proton-proton colliders.

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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
1
The categories of this paper are: cs
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex