Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The asymptotic behaviour of the $\pi^0$ $\gamma^\ast$ $\gamma^\ast$
  vertex   The Bjorken-Johnson-Low theorem applied to the $\gamma^\ast \to \gamma^\ast
\pi^0$ process provides us with a rather remarkable asymptotic behaviour for
the $\pi^0 \gamma^\ast \gamma^\ast$ vertex. We compare our result with previous
QCD- inspired estimates and argue that the predicted behaviour is quite
consistent with the present data on hadronic $J/\Psi$ decays and ensures the
matching of long- and short-distance radiative corrections to $\pi^+ \to e^+
\nu_e$.

10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph