Glueball nature of the σ /f 0 (600) from ππ and γγ scatterings
作者： G. Mennessier , S. Narison , W. Ochs
DOI: 10.1016/J.PHYSLETB.2008.06.018
关键词: Particle physics 、 Quantum chromodynamics 、 Nuclear physics 、 Complex plane 、 Glueball 、 Scattering amplitude 、 Scalar meson 、 Physics 、 Hadron 、 Scattering 、 K matrix
摘要: Abstract We estimate the I = 0 scalar meson σ / f ( 600 ) parameters from ππ and γγ scattering data below 700 MeV using an improved analytic K-matrix model. A fit of hadronic gives a complex pole mass M 422 − i 290 , while simultaneous best fits γ → π + give direct width 0.13 ± 0.05 keV rescattering component 2.7 0.4 total (direct + rescattering) 3.9 0.6 . “Running” these results to physical real axis, small “direct” large widths at “on-shell” are compatible with QCD spectral sum rules (QSSR) some low-energy theorems (LET) expectations for unmixed lowest glueball/gluonium B around 1 GeV OZI-violation decay into ππ.
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