Lightest scalar and tensor resonances in $γγ\toππ$ after the Belle experiment

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dc.creatorAchasov, N. N.
dc.creatorShestakov, G. N.
dc.date2007-12-06
dc.date2008-04-28
dc.date.accessioned2026-07-07T11:39:11Z
dc.date.available2026-07-07T11:39:11Z
dc.descriptionNew high statistics Belle data on the $γγ\toπ^+π^-$ reaction cross section measured in the range of pion-pair invariant masses $\sqrt{s}$ between 0.8 GeV and 1.5 GeV are analyzed to clarify the current situation around the $σ(600)$, $f_0(980)$, and $f_2(1270)$ resonances in $γγ$ collisions. The present analysis shows that the direct coupling constants of the $σ(600)$ and $f_0(980)$ resonances to $γγ$ are small, and the $σ(600)\toγγ$ and $f_0(980)\toγγ$ decays are four-quark transitions caused by the $π^+π^-$ and $K^+K^-$ loop mechanisms, respectively. The chiral shielding of the $σ(600)$ resonance takes place in the reactions $γγ\toππ$ as well as in $ππ$ scattering. Some results of a simultaneous description of the $γγ\toπ^+π^-$ and $γγ\toπ^0π^0$ Belle data are also presented. In particular, the following tentative estimate of the $f_2(1270)\toγγ$ decay width is obtained: $Γ_{f_2\toγγ}(m^2_{f_2})\approx 3.68$ keV.
dc.description14 pages, 5 figures. Fitted for the publication in Physical Review D
dc.identifierhttps://arxiv.org/abs/0712.0885
dc.identifierhttp://arxiv.org/abs/0712.0885
dc.identifierPhys.Rev.D77:074020,2008
dc.identifierdoi:10.1103/PhysRevD.77.074020
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/199829
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.subjectNuclear Theory
dc.titleLightest scalar and tensor resonances in $γγ\toππ$ after the Belle experiment
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