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Physics Letters B 680, 2 (2009) 148-153
Gluonium nature of the sigma/f_0(600) from its coupling to KK
R. Kaminski, Gerard Mennessier1, Stéphan Narison1

We extract the K+K- couplings of the isoscalar scalar mesons sigma/f_0(600)and f_0(980) from pi pi to pi pi / K K scatterings and found: |g_{sigma K+K-}|/|g_{sigma pi+pi-}|= 0.8 and |g_{f_0 K+K-}|/ |g_{f_0 pi+pi-}|= 1.7. Theseresults, together with the tiny "direct" gamma gamma width of the sigma and itslarge hadronic width, are a strong indication for the gluonium/glueball natureof the sigma-meson, as predicted by QCD spectral sum rules (QSSR) + somelow-energy theorems (LET), while some other assignements (pi pi molecule,tetraquark state and ordinary qq meson) do not satisfy simultaneously theserequirements from the data. These properties suggest that the sigma can be ascalar meson associated to the U(1)V conformal anomaly like is the eta'-mesonfor the U(1)A anomaly.
1 :  LPTA - Laboratoire de Physique Théorique et Astroparticules
Physique/Physique des Hautes Energies - Phénoménologie
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