Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Perturbative pion form factor reexamined   We recalculate the pion electromagnetic form factor based on the perturbative
QCD formalism that includes the Sudakov resummation. We take into account the
evolution of the pion wave function in $b$, which represents the transverse
extent of the pion. An infrared enhancement is observed when $1/b$ approaches
$\Lambda_{QCD}$. We propose to freeze the evolution of the wave function at
some scale above $\Lambda_{QCD}$, such that perturbative contributions are
stablized. Our predictions are consistent with experimental data, and
insensitive to the variation of relevant parameters.

15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph