Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unfactorizing Polychromatic Penguins   Firstly, I report on a recent work --carried out with T. Hambye and E. de
Rafael-- on how to use the large-Nc expansion to calculate unfactorized
contributions from the strong penguin operators, and their impact on
observables such as epsilon'/epsilon and the Delta I = 1/2 rule. Secondly,
based on work done with M. Golterman, I explain how this calculation allows one
to predict some rather dramatic consequences for quenched QCD. This may help
explain the present discrepancy between lattice and experimental results for
epsilon'/epsilon. The emphasis of this article is put on the explanation of the
method of calculation used, which is fully analytic. This allows one to build
some intuition and understand the role played by the different hadronic scales
in determining the size of the different contributions.

31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th