Vector mesons in the Extended Chiral Quark Model

Details Vector mesons in the Extended Chiral Quark Model Vector mesons in the Extended Chiral Quark Model

1999-06-23

arxiv.org/abs/hep-ph/9906459v3

JHEP 9910 (1999) 022

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, Latex, JHEP class, more typos removed, few refs.added

Scientific paper

10.1088/1126-6708/1999/10/022

We extend our previous formulation of low-energy QCD in terms of an effective lagrangian containing operators of dimensionality $d\le 6$ constructed with pseudoscalars and quark fields, describing physics below the scale of chiral symmetry breaking. We include in this paper the vector and axial-vector channels. We follow closely the Extended Chiral Quark Model approach and consistently work in the large-$N_c$ and leading log approximation and take into account the constraints from chiral symmetry and chiral symmetry restoration. The optimal fit of all parameters gives further support to a heavy scalar meson with a mass $\sim 1$ GeV and a value of the axial pion-quark coupling constant $g_A \simeq 0.55$ to 0.66, depending on some assumptions concerning the Weinberg sum rules.

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