Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Partially Quenched and Three Flavour ChPT at Two Loops   A summary of recent progress in Chiral Perturbation Theory (ChPT) at the
two-loop level is given. A short introduction to ChPT is included, along with
an explanation of the usefulness of developing ChPT for partially quenched QCD.
Further, our recent work in partially quenched ChPT is reviewed, and a few
comments are given on older work in mesonic ChPT at the two-loop level. In
particular, we quote the present best values for the low-energy constants of
the $\mathcal{O}(p^4)$ chiral Lagrangian.

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The categories of this paper are: astro-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn
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The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-th
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The categories of this paper are: stat
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an
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The categories of this paper are: gr-qc