Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chiral Perturbation Theory with Photons and Leptons   I discuss a low-energy effective field theory which permits the full
treatment of isospin-breaking effects in semileptonic weak interactions. In
addition to the pseudoscalars and the photon, also the light leptons have to be
included as dynamical degrees of freedom in an appropriate chiral Lagrangian. I
describe the construction of the local action at next-to-leading order.

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The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
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The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: funct-an
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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
2
The categories of this paper are: math