Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chiral low-energy constants   The progress in determining the coupling constants of mesonic chiral
Lagrangians is reviewed, with emphasis on the work performed in three
successive European Networks (Eurodaphne I and II, Euridice). Reliable
estimates of those constants are essential for making full use of
next-to-next-to-leading-order calculations in chiral perturbation theory. The
precision in the values of the strong coupling constants of O(p^4) has been
increasing steadily over the years. The situation is less satisfactory in the
nonleptonic weak sector where further phenomenological input and more
theoretical work are needed. A lot of progress has recently been achieved for
electromagnetic coupling constants occurring in radiative corrections for
mesonic processes at low energies.

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The categories of this paper are: econ
5
The categories of this paper are: gr-qc
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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: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
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The categories of this paper are: cond-mat
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom