Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Flavour-symmetry breaking of the quark condensate and chiral corrections
  to the Gell-Mann-Oakes-Renner relation   The relation between the chiral quark condensate in QCD sum rules and chiral
perturbation theory is clarified with the help of a low-energy theorem for the
scalar and pseudoscalar correlation functions. It is found that the quark
condensate should be identified with the non-normal-ordered vacuum expectation
value of quark-antiquark fields. Utilising results on flavour SU(3) breaking of
the quark condensate from QCD sum rules, the unphysical low-energy constant
H_2^r in the chiral Lagrangian, as well as next-to-leading order corrections to
the Gell-Mann-Oakes-Renner relation are estimated.

14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math