Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Decay constants from twisted mass QCD   We present results for chiral extrapolations of the mass and decay constants
of the rho meson. The data sets used are the nf=2 unquenched gauge
configurations generated with twisted mass fermions by the European Twisted
Mass Collaboration. We describe a calculation of three decay constants in
charmonium and explain why they are required.

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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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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: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn