Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Saturation of counterterms by resonances in $K \to \pi e^{+} e^{-}$
  decays   The decays $K^{+} \rightarrow \pi^{+} e^{+} e^{-}$, $K_{S} \rightarrow
\pi^{0} e^{+} e^{-}$ and $K_{L} \rightarrow \pi^{0} e^{+} e^{-}$ are
reinvestigated within the framework of chiral perturbation theory. The
counterterms induced by strong, electromagnetic and weak interactions are
determined assuming the resonance exchange. The weak deformation model, the
factorization model and the large $N_{c}$ limit are used to create a weak
Lagrangian. It is found that the results of the first two approaches depend on
the $H_{1}$ coupling, defined in the effective chiral Lagrangian of the ${\it
O} (p^{4})$ order. The set of parameters used in the extended Nambu and
Jona-Lasinio model can accommodete $K^{+} \rightarrow \pi^{+} e^{+} e^{-}$
decay rate within the factorization approach. The CP violating $K_{L}
\rightarrow \pi^{0} e^{+} e^{-}$ decay rate is discussed.

14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat