Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Penguins diagrams in Delta I=1/2 rule and \epsilon'/\epsilon with \sigma
  models   We study the correlation between $\epe$ and $\Delta I=1/2$ rule in the
framework of non-linear $\sigma$ model including scalar mesons. The matrix
elements of QCD and Electroweak (EW) penguin operators are computed within
factorization approximation. Using the matrix elements and changing the scalar
meson mass, we find that there is correlation between $\epe$ and $\Delta I=1/2$
amplitude. However, it is difficult to explain both $\epe$ and $\Delta I=1/2$
amplitude simultaneously. In order to be compatible with $\epe$, typically,
about half of $\Delta I=1/2$ amplitude can be explained at most. Our result
suggests there may be substantial non-factorizable contribution to CP
conserving $K \to \pi \pi$ amplitudes.

17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph