Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-09-12
Physics
High Energy Physics
High Energy Physics - Phenomenology
Invited talk at the Hadron2011: XIV International Conference on Hadron Spectroscopy. TU Munich, 13-17 June 2011
Scientific paper
One-loop unitarized Chiral Perturbation Theory (UChPT) calculations, suggest a different Nc behaviour for the sigma or f0(600) and rho(770) mesons: while the rho meson becomes narrower with Nc, as expected for a qqbar meson, the f0(600) contribution to the total cross section below 1 GeV becomes less and less important. Here we review our recent work where we have shown, by means of finite energy sum rules, that a different Nc behaviour for these resonances may lead to a conflict with semi-local duality for large Nc, since local duality requires a cancellation between the f0(600) and rho(770) amplitudes. However, UChPT calculations also suggest a subdominant qqbar component for the f0(600) with a mass above 1 GeV and this can restore semi-local duality, as we show.
de Elvira Jacobo Ruiz
Pelaez Jose Ramon
Pennington M. R.
Wilson Dalziel J.
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