Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New-physics signatures via $C\!P$ violation in
  $\eta^{(\prime)}\to\pi^0\mu^+\mu^-$ and $\eta^\prime\to\eta\mu^+\mu^-$ decays   In this work we investigate the prospect of observing new-physics signatures
via $C\!P$ violation in $\eta^{(\prime)}\to\pi^0\mu^+\mu^-$ and
$\eta^\prime\to\eta\mu^+\mu^-$ decays at the REDTOP experiment. We make use of
the SMEFT to parametrise the new-physics $C\!P$-violating effects and find that
the projected REDTOP statistics are not competitive with respect to nEDM
experiments. This reasserts the $\eta\to\mu^+\mu^-$ process as the most
promising channel to find $C\!P$-violation at this experimental facility.

28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
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The categories of this paper are: stat
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph