Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The relevance of pion-exchange contributions versus contact terms in the
  chiral effective field theory description of nucleon-nucleon scattering   The standard way to demonstrate the relevance of chiral symmetry for the NN
interaction is to consider higher partial waves of NN scattering which are
controlled entirely by chiral pion-exchanges (since contacts vanish). However,
in applications of NN-potentials to nuclear structure and reactions, the lower
partial waves are the important ones, making the largest contributions. Lower
partial waves are sensitive to the short-range potential, and so, when the
short-range contacts were to dominate over the chiral pion-contributions in
lower partial waves, then the predictions from "chiral potentials" would have
little to do with chiral symmetry. To address this issue, we investigate
systematically the role of the (chiral) one- and two-pion exchanges, on the one
hand, and the effect of the contacts, on the other hand, in the lower partial
waves of NN scattering. We are able to clearly identify the signature of chiral
symmetry in lower partial waves. Our study has also a pedagogical spin-off as
it demonstrates in detail how the reproduction of the lower partial-wave phase
shifts comes about from the various ingredients of the theory.

20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio