Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The D^0 -> K^0 \bar{K^0} decay beyond factorization   The decay mode D^0 -> K^0 \bar{K^0} has no factorizable contribution. We
calculate the nonfactorizable chiral loop contributions of order O(p^3)and then
we use a heavy-light type chiral quark model to calculate nonfactorizable tree
level terms, also of order O(p^3), proportional to the gluon condensate.
Calculated chiral loops and the gluon condensate contributions are of the same
order of magnitude as the experimental amplitude.

31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio