Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Differential cross sections for elastic and inelastic
  positronium-hydrogen-atom scattering   We report results of differential cross sections for elastic scattering,
target-elastic Ps excitations and target-inelastic excitation of hydrogen in a
five-state coupled-channel model allowing for Ps(1s)H(2s,2p) and Ps(2s,2p)H(1s)
excitations using a recently proposed time-reversal-symmetric regularized
electron-exchange model potential. The present model yields a singlet Ps-H
S-wave resonance at 4.01 eV of width 0.15 eV and a P-wave resonance at 5.08 eV
of width 0.004 eV. We also study the effect of the inclusion of the excited Ps
and H states on the convergence of the coupled-channel scheme.

37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio