Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Disoriented Chiral Condensates and Anomalous Production of Pions   The leading-particle effect and the factorization property of the scattering
amplitude in the impact parameter space are used to study semiclassical
production of pions in the central region. The mechanism is related to the
isospin-uniform solution of the nonlinear $ \sigma $-model coupled to quark
degrees of freedom. The multipion exchange potential between two quarks is
derived. It is shown thatthe soft chiral pion bremsstralung also leads to
anomalously large fluctuations in the ratio of neutral to charged pions. We
show that only direct production ofpions in the form of an isoscalar coherent
pulse without isovector pairs can lead to large neutral-charged fluctuations.

16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an