Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rare Decays of K and B Mesons Revisited   The rare decays of mesons are higher order effects in weak interactions. The
main contributions to such decay processes are from the Z-penguin, the
photonpenguin and the box diagram. At the quark level, these contributions are
well known. However, when considering the corresponding physical hadronic
processes, a knowledge of how hadronic states are expressed in terms of quarks.
In this paper, we suggest a simplistic way to relate the quark level process to
the hadronic process. For simplicity, we consider here only the decays of
pseudoscalar mesons. The meson-quark coupling is described in terms of a
gamma-5 coupling with a constant coupling constant. We apply the model to
processes in which meson M1 decays to meson M2 with the emissions of neutrino
pair and charged lepton pair. In calculating the decay rates, a cut-off
momentum lamda is introduced to control the divergent triangle integral over
the internal momentum. The results of our calculation is compared to
experimental data on the decay rates for K- and B-meson decays.

26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin