Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A formulation without partial wave decomposition for scattering of
  spin-1/2 and spin-0 particles   A new technique has been developed to calculate scattering of spin-1/2 and
spin-0 particles. The so called momentum-helicity basis states are constructed
from the helicity and the momentum states, which are not expanded in the
angular momentum states. Thus, all angular momentum states are taken into
account. Compared with the partial-wave approach this technique will then give
more benefit especially in calculations for higher energies. Taking as input a
simple spin-orbit potential, the Lippman-Schwinger equations for the T-matrix
elements are solved and some observables are calculated.

18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg