Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Heavy Baryon Chiral Perturbation Theory and the Spin 3/2 Delta
  Resonances   Heavy baryon chiral perturbation theory is briefly reviewed, paying
particular attention to the role of the spin 3/2 delta resonances. The concept
of resonance saturation for the baryonic sector is critically discussed.
Starting from a relativistic formulation of the pion-nucleon-delta system, the
heavy baryon chiral lagrangian including spin 3/2 resonances is constructed by
means of a 1/m-expansion. The effective theory obtained admits a systematic
expansion in terms of soft momenta, the pion mass $M_\pi$ and the delta-nucleon
mass difference $\Delta$.

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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: math
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The categories of this paper are: math-ph
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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: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
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The categories of this paper are: cond-mat