%0 Journal Article
%T Glueball nature of the sigma/f_0(600) from pi-pi and gamma-gamma scatterings
%+ Laboratoire de Physique Théorique et Astroparticules (LPTA)
%A Mennessier, Gerard
%A Narison, Stéphan
%A Ochs, W.
%< avec comité de lecture
%Z 08-080
%@ 0370-2693
%J Physics Letters B
%I Elsevier
%V 665
%N 4
%P 205-211
%8 2008-07-24
%D 2008
%Z 0804.4452
%R 10.1016/j.physletb.2008.06.018
%Z Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
%Z Physics [physics]/High Energy Physics - Experiment [hep-ex]
%Z Physics [physics]/High Energy Physics - Lattice [hep-lat]
%Z Physics [physics]/Nuclear Theory [nucl-th]Journal articles
%X We estimate the I=0 scalar meson sigma/f_0(600) parameters from pi-pi andgamma-gamma scattering data below 700 MeV using an improved analytic K-matrixmodel. A fit of the hadronic data gives a complex pole mass M_sigma= 422-i290MeV, while simultaneous best fits of the gamma-gamma to pi+pi-, pi0pi0 datagive 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 compatiblewith QCD spectral sum rules (QSSR) and some low-energy theorems (LET)expectations for an unmixed lowest mass glueball/gluonium sigma_B of a massaround 1 GeV and a large OZI-violation decay into pi-pi.
%G English
%L hal-00378058
%U https://hal.science/hal-00378058
%~ IN2P3
%~ LPTA
%~ CNRS
%~ UNIV-MONTP2
%~ UNIV-MONTPELLIER
%~ UM1-UM2