Calculation of gluon and four-quark condensates from the operator expansion

Details Calculation of gluon and four-quark condensates from the operator expansion Calculation of gluon and four-quark condensates from the operator expansion

2003-09-11

arxiv.org/abs/hep-ph/0309122v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, latex, changed content slightly

Scientific paper

10.1103/PhysRevD.70.074027

The magnitudes of gluon and four-quark condensates are found from the analysis of vector mesons consisting of light quarks (the families of $\rho$ and $\omega$ mesons) in the 3 loops approximation. The QCD model with infinite number of vector mesons is used to describe the function $R(s)$. This model describes well the experimental function $R(s)$. Polarization operators calculated with this model coincide with the Wilson operator expansion at large $Q^2$. The improved perturbative theory, such that the polarization operators have correct analytical properties, is used. The result is $<0 | (\alpha_s/\pi) G^2 | 0 > = 0.062 \pm 0.019 GeV^4$. The electronic widths of $\rho(1450)$ and $\omega(1420)$ are calculated.

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