Glueball nature of the sigma/f_0(600) from pi-pi and gamma-gamma scatterings

Details Glueball nature of the sigma/f_0(600) from pi-pi and gamma-gamma scatterings Glueball nature of the sigma/f_0(600) from pi-pi and gamma-gamma scatterings

2008-04-28

arxiv.org/abs/0804.4452v3

Phys.Lett.B665:205-211,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

Version to appear in Phys. Lett. B (some misprints corrected), 8 pages, 2 figures

Scientific paper

10.1016/j.physletb.2008.06.018

We estimate the I=0 scalar meson sigma/f_0(600) parameters from pi-pi and gamma-gamma scattering data below 700 MeV using an improved analytic K-matrix model. A fit of the hadronic data gives a complex pole mass M_sigma= 422-i290 MeV, while simultaneous best fits of the gamma-gamma to pi+pi-, pi0pi0 data give a direct width of (0.13+-0.05)keV, a rescattering component of (2.7+-0.4)keV and a total (direct+rescattering) width of (3.9+-0.6)keV. "Running" these results to the physical real axis, the small "direct" gamma-gamma and the large hadronic widths at the "on-shell" mass are compatible with QCD spectral sum rules (QSSR) and some low-energy theorems (LET) expectations for an unmixed lowest mass glueball/gluonium sigma_B of a mass around 1 GeV and a large OZI-violation decay into pi-pi.

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