Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Form-factors and current correlators: chiral couplings L_10(mu) and
  C_87(mu) at NLO in 1/N(C)   Using the resonance chiral theory Lagrangian, we perform a calculation of the
vector and axial-vector two-point functions at the next-to-leading order (NLO)
in the 1/N(C) expansion. We have analyzed these correlators within the
single-resonance approximation and have also investigated the corrections
induced by a second multiplet of vector and axial-vector resonance states.
Imposing the correct QCD short-distance constraints, one determines the
difference of the two correlators Pi(t) = Pi_VV(t)- Pi_AA(t) in terms of the
pion decay constant and resonance masses. Its low momentum expansion fixes then
the low-energy chiral couplings L_10 and C_87 at NLO, keeping full control of
their renormalization scale dependence. At mu_0=0.77 GeV, we obtain L_10(mu_0)
= (-4.4 \pm 0.9)10^{-3} and C_87^r(mu_0)=(3.1 \pm 1.1)10^{-5}.

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The categories of this paper are: astro-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph
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The categories of this paper are: q-bio
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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: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph