Lightest Scalar Resonances and the Dynamics of the γγ\toππReactions

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dc.creatorAchasov, N. N.
dc.creatorShestakov, G. N.
dc.date2008-10-13
dc.date.accessioned2026-07-07T12:43:16Z
dc.date.available2026-07-07T12:43:16Z
dc.descriptionThe high-statistics Belle data on the γγ\toπ^+π^- and γγ\toπ^0π^0 reactions have been jointly analyzed. The main dynamical mechanisms of these reactions for energies below 1.5 GeV have been revealed. It has been shown that the direct coupling constants of the σ(600) and f_0(980) resonances with a γγpair are small and that the σ(600)\toγγand f_0(980)\toγγdecays are four-quark transitions due primarily to π^+π^- and K^+K^- loop mechanisms, respectively. The role of the chiral shielding of the σ(600) resonance is emphasized. The widths of the f_0(980)\toγγand σ(600)\toγγdecays averaged over the resonance mass distributions, as well as the width of the f_2(1270)\toγγdecay, are estimated as (Γ_{f_0\toγγ})_{ππ}\approx 0.19 keV, (Γ_{σ\toγγ})_{ππ}\approx 0.45 keV, and Γ_{f_2\toγγ}(m^2_{f_2})\approx 3.8$ keV.
dc.description6 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/0810.2201
dc.identifierhttp://arxiv.org/abs/0810.2201
dc.identifierJETP Lett.88:295-301,2008; Pisma Zh.Eksp.Teor.Fiz.88:345-350,2008
dc.identifierdoi:10.1134/S0021364008170025
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/220359
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.subjectNuclear Theory
dc.titleLightest Scalar Resonances and the Dynamics of the γγ\toππReactions
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