Rho meson properties from combining QCD-based models

Details Rho meson properties from combining QCD-based models Rho meson properties from combining QCD-based models

2003-03-04

arxiv.org/abs/hep-ph/0303020v1

Nucl.Phys. A743 (2004) 283-302

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 1 figure, Revtex4

Scientific paper

10.1016/j.nuclphysa.2004.08.005

Aiming at the calculation of the properties of rho-mesons, non-perturbative QCD-based methods are discussed concerning their potentials as well as their short-comings. The latter are overcome by combining these techniques. The utilized methods are (i) the chiral constituent quark model deduced from the instanton vacuum model and large-N_c arguments, (ii) chiral perturbation theory unitarized by the inverse amplitude method and (iii) QCD sum rules. Advantages of the combination of these methods are especially the absence of un-physical quark-production thresholds and parameter-free results. Already in the chiral limit and in leading order in 1/N_c one obtains a reasonable result for the mass of the rho-meson, namely m_rho = 790 \pm 30 MeV. Using the KSFR relation the universality of the rho-meson coupling is recovered. The latter is found to be g = 6.0 \pm 0.3.

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