Chiral symmetry breaking parameters from QCD sum rules
1982; Elsevier BV; Volume: 206; Issue: 1 Linguagem: Inglês
10.1016/0550-3213(82)90490-4
ISSN1873-1562
Autores Tópico(s)High-Energy Particle Collisions Research
ResumoWe obtain new QCD sum rules by considering vacuum expectation values of two-point functions, taking all the five quark bilinears into account. These sum rules are employed to extract values of different chiral symmetry breaking parameters in QCD theory. We find masses of light quarks, m̂ = 12(mu+md) = 8.4 ± 1.2 MeV, ms = 205 ± 65 MeV. Further, we obtain corrections to certain soft pion (kaon) PCAC relations and the violation of SU(3) flavour symmetry by the non-strange and strange quark-antiquark vacuum condensate.
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