Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Helicity Formalism for NN Scattering without Partial Wave Decomposition   At intermediate energies it appears advantageous to work without partial wave
decomposition and use directly the momentum vectors. We derived a finite set of
coupled Lippmann-Schwinger equations using helicities. They can be used for any
type of realistic NN forces, which are given in operator form. As an example we
have chosen the Bonn OBEPR NN potential.

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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: nlin