2010/09/30 by G. Mennessier, Stéphan Narison, S. Narison +2 · 40 citations
Mathematics · Physics and Astronomy · #Amplitude #Geometry #Hadron #High-Energy Particle Collisions Research #Mathematics #Meson #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #Scalar (mathematics) #hep-ex #hep-lat #hep-ph #nucl-th
paper · pdf · doi:10.1016/j.physletb.2010.12.001
published in Physics Letters B 696(1-2), 40-50 (Elsevier BV) · 11 pages, 6 figures (1 more figure added in Fig 6), 4 tables : version appeared on-line in doi:10.1016/j.physletb.2010.12.001
openalex publication_date 2010/12/06 · arxiv created 2010/12/26 · arxiv updated 2011/01/04 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Using an improved "analytic K-matrix model", we reconsider the extraction of the sigma/f0(600) and f0(980) gamma-gamma widths from gamma-gamma to pi-pi scatterings data of Crystal Ball and Belle. Our main results are summarized in Tables 3 and 4. The averaged sigma "direct width" to gamma-gamma is 0.16(3) keV which confirms a previous result of [1] and which does neither favour a large four-quark (diquark-antidiquark) nor a molecule nor a pure qq component. The "direct width" of the f0(980) of 0.28(2) keV is much larger than the four-quark expectation but can be compatible with a ss or gluonium component. We also found that the rescattering part of the amplitude is relatively large indicating an important contribution of the meson loops in the determination of the gamma-gamma total widths. This is mainly due to the large couplings of the sigma and f0(980) to pi-pi and/or KK, which can also be due to a light scalar gluonium with large OZI violating couplings but not necessary to a four-quark or molecule state. Our average results for the total (direct+rescattering) gamma-gamma widths: Gammasigmatot= 3.08(82) keV, Gammaf0tot= 0.16(1) keV are comparable with the ones from dispersion relations and PDG values. Using the parameters from QCD spectral sum rules, we complete our analysis by showing that the production rates of unmixed scalar gluonia sigmaB(1) and G (1.5-1.6) agree with the data from J/ψ, phi radiative and Ds semi-leptonic decays.