Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Weak Matrix Elements on the Lattice: Recent Developments in K-Physics   Some recent developments in the calculation of weak matrix elements on the
lattice are reviewed. In particular, we concentrate on the application of MPSTV
non-perturbative renormalization method to the operators relevant to kaon
physics. The chiral behaviour of the $B_K$ parameter and the long-standing
question of the $\Delta I=1/2$ rule are discussed.

2
The categories of this paper are: math
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
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The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
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The categories of this paper are: eess
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas