Nonet Classification of Scalar/Isoscalar Resonances below 1900 MeV: the Existence of an Extra Scalar State in the Region 1200-1600 MeV

Abstract

A classification of the $I{J}^{PC}=00^{++}$ mesons is performed on the basis of the K-matrix analysis of meson spectra in the reactions: (i) GAMS data on $\pi p\to {\pi }^0{\pi }^{0}n$, $\eta \eta n$, $\eta {\eta }^{\prime }n$; (ii) Crystal Barrel data on $p\bar{p}(atrest)\to {\pi }^0{\pi }^0{\pi }^0$, ${\pi }^0{\pi }^0\eta$, ${\pi }^0\eta \eta$; (iii) CERN-Münich data on $\pi p\to {\pi }^{+}{\pi }^{-}n$; (iiii) BNL data on $\pi N\to K\bar{K}N$. The analysis points to the existence of four comparatively narrow scalar resonances which correspond to the following poles of the scattering amplitude (in MeV): $(1015\pm 15)-i(43\pm 8)$, $(1300\pm 20)-i(120\pm 20)$, $(1499\pm 8)-i(65\pm 10)$ and $(1780\pm 30)-i(125\pm 70)$. The scattering amplitude also has a fifth pole $f_0(1530_{-250}^{+90})$ at the complex mass $(1530_{-250}^{+90})-i(560\pm 140)$. The masses of the K-matrix poles (bare states) are at $720\pm 100$ MeV, $1230\pm 50$ MeV, $1260\pm 30$ MeV, $1600\pm 50$ MeV and $1810\pm 30$ MeV. The quark content of the bare states is analyzed using the values of their couplings to the $\pi \pi$, $K\bar{K}$, $\eta \eta$ and $\eta {\eta }^{\prime }$. It is shown that one of the bare states in the mass region 1200-1600 MeV is superfluous for the $q\bar{q}$ classification and should be considered as the lightest glueball.

LaTex 26 pages and 8 figures

Cited by in corpus (41)

• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts
• Systematics of q anti-q states in the (n,M^2) and (J,M^2) planes
• The Status of Glueballs
• K-matrix analysis of the K-pi S-wave in the mass region 900-2100 Mev and nonet classification of scalar qqbar-states
• Nature of the light scalar mesons
• The radiative decay phi - gamma pi pi in a coupled channel model and the structure of f0(980)
• Glueball nature of the sigma/f_0(600) from pi-pi and gamma-gamma scatterings
• $0^{++}$-Glueball/$q\bar{q}$-State Mixing in the Mass Region near 1500 MeV
• The sigma and f_0(980) from Ke4 + pi-pi scatterings data
• A partial wave analysis of the ${\pi }^0{\pi }^0$ system produced in ${\pi }^{-}p$ charge exchange collisions
• B decays into light scalar particles and glueball
• Exotic mesons, locking states and their role in the formation of the confinement barrier
• Scalar glueball: analysis of the (IJ^{PC}=00^{++})-wave
• New study of the isotensor pi-pi interaction
• A partial wave analysis of the centrally produced pi0pi0 system in pp interactions at 450 GeV/c
• Partial wave analysiss of pbar-p -> piminus-piplus, pizero-pizero, eta-eta and eta-etaprime
• The lightest scalar glueball
• Model-independent resonance parameter extraction using the trace of K and T matrices
• Gluon Fragmentation into Glueballs and Hybrid Mesons
• Partial widths a_0(980)\toγγ, f_0(980)\toγγand q\bar q-classification of the lightest scalar mesons
• Scalar mesons: in search of the lightest glueball
• A possible assignment for the ground scalar meson nonet
• The light sigma meson
• Scalar mesons and low-mass sigma: Does the $\sigma$ reveal the confinement singularity?
• A New Decomposition of pion-pion S-wave Interaction
• The two-pion spectra for the reaction π^- p -> π^0π^0 n at 38 GeV/c pion momentum and combined analysis of the GAMS, Crystal Barrel and BNL data
• Two-photon partial widths of tensor mesons
• Systematization of tensor mesons and the determination of the $2^{++}$ glueball
• Study of Leading Hadrons in Gluon and Quark Fragmentation
• Towards resolution of the scalar meson nonet enigma II.Gell-Mann-Okubo revisited
• Reactions gamma gamma -> pi pi and gamma gamma -> K \bar K: the (IJ^{PC}=00^{++})-wave spectra at E_{gamma gamma}^{(c.m.)} = 300- 1900 MeV
• D^+_s -> pi^+ pi^+ pi^- decay: the 1^3P_0 s anti-s component in scalar-isoscalar mesons
• Determination of the strangeness contents of light-flavour isoscalars from its production rates in hadronic Z decays measured at LEP
• Nonet Classification of Scalar/Isoscalar Resonances in the Mass Region below 1900 MeV: Observation of the Lightest Scalar Glueball
• Observation of Observation of tensor glueball in the reactions p anti-p -> pi-pi, eta-eta, eta-eta'
• Mechanisms of the $f_0(980)$ production in the reaction ${\pi }^{-}p\to {\pi }^0{\pi }^{0}n$
• Quark-gluonium content of the scalar-isoscalar states f_0(980), f_0(1300), f_0(1500), f_0(1750), f_0(1420 ^{+150}_{- 70}) from hadronic decays
• Hadron Spectroscopy without Constituent Glue
• A study of the pi^0pi^0 system produced in charge exchange and central collisions
• Investigation of meson-meson interaction
• Process pi p -> pi pi N at high energies and moderate momenta transferred to the nucleon and the determination of parameters of the f_0(980) and f_0(1300)