Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nucleon-Nucleon Scattering with Coupled Nucleon-Delta Channels in Chiral
  Effective Field Theory   In this work the elastic scattering of two nucleons is calculated in chiral
effective field theory at next-to-leading order taking into account the coupled
N$\Delta$-, $\Delta$N- and $\Delta\Delta$-channels. To solve the coupled
channel scattering equation one needs as input the potentials for all
combinations of these initial and final states. Up to next-to leading order
these (transition) potentials arise from one-pion exchange, two-pion exchange
and contact interactions. For the two-pion exchange we give analytic
expressions for the spectral functions derived from all contributing one-loop
diagrams. The forms of the contact potentials at leading and next-to-leading
order are determined. We perform a fit of the low energy constants, that belong
to the $NN \rightarrow NN$ contact potential and contribute up to
next-to-leading order to $S$- and $P$-waves of NN scattering only. The
influence of the $\Delta$-isobar dynamics entering through the coupled channels
is studied in detail.

7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol