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

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dc.creatorMennessier, G.
dc.creatorNarison, S.
dc.creatorOchs, W.
dc.date2008-04-28
dc.date2008-06-20
dc.date.accessioned2026-07-07T11:33:43Z
dc.date.available2026-07-07T11:33:43Z
dc.descriptionWe 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.
dc.descriptionVersion to appear in Phys. Lett. B (some misprints corrected), 8 pages, 2 figures
dc.identifierhttps://arxiv.org/abs/0804.4452
dc.identifierhttp://arxiv.org/abs/0804.4452
dc.identifierPhys.Lett.B665:205-211,2008
dc.identifierdoi:10.1016/j.physletb.2008.06.018
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/197991
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.subjectHigh Energy Physics - Lattice
dc.subjectNuclear Theory
dc.titleGlueball nature of the sigma/f_0(600) from pi-pi and gamma-gamma scatterings
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