Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electromagnetic corrections for the analysis of low energy $\pi^- p$
  scattering data   We calculate the electromagnetic corrections to the isospin invariant mixing
angle and to the two eigenphases for the $s$-, $p_{1/2}$- and $p_{3/2}$-partial
waves for $\pi^- p$ elastic and charge exchange scattering. These corrections
have to be applied to the nuclear quantities in order to obtain the two
hadronic phase shifts for each partial wave. The calculation uses relativised
Schr\"{o}dinger equations containing the sum of an electromagnetic potential
and an effective hadronic potential. The mass differences between $\pi^-$ and
$\pi^0$ as well as between $p$ and $n$ are taken into account. We compare our
results with those of previous calculations and qualitatively estimate the
uncertainties in the corrections.

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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
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The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: astro-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
2
The categories of this paper are: math
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
5
The categories of this paper are: gr-qc