Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Consistent Prediction for Direct CP Violation and \Delta I = 1/2 Rule   The theoretical status of direct CP violation $\epsilon'/\epsilon$ is briefly
reviewed. Special attention is paid to the recent new consistent predictions
for both the ratio $\epsilon'/\epsilon$ and the $\Delta I = 1/2$ rule within
the standard model. In particular, two matching conditions resulting from the
matching between the QCD and chiral perturbation theory(ChPT), and also some
algebraic relations of chiral operators are found to be very useful. It is of
interest that the new predictions are no longer sensitive to the strange quark
mass, and are also renormalization scale and scheme independent in the leading
QCD and chiral loop approximation with large $N_c$ approach. The new prediction
for the direct CP violation with the value $\epsilon'/\epsilon= (20 \pm 4)
\times 10^{-4} [Im\lambda_t /1.2\times 10^{-4}]$ is consistent with the most
recent experimental results reported by the NA48 and KTeV groups.

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The categories of this paper are: q-bio
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The categories of this paper are: comp-gas
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex