Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A New Estimate of $\varepsilon '/\varepsilon$   We discuss a new estimate of $\varepsilon '/\varepsilon$ in the kaon system.
The present approach is based on the evaluation of the hadronic matrix elements
of the \mbox{$\Delta S =1$} effective quark lagrangian by means of the chiral
quark model, with the inclusion of meson one-loop renormalization and NLO
Wilson coefficients. The estimate here reviewed is fully consistent with the
$\Delta I =1/2$ selection rule in $K\to \pi\pi$ decays, which is well
reproduced within the same framework.

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The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
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The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex