Four Sorts of Mesons

Abstract

This report reviews the extensive spectrum of light non-strange qbar-q states up to a mass of 2400 MeV from Crystal Barrel and PS172 data on pbar-p -> Resonance -> A + B in 17 final states. For I=0, C=+1, the spectrum is complete and very secure. Glueball candidates fo(1500), fo(2100), f_2(1950) and eta(2190) are reviewed and also hybrid candidates eta_2(1870) and pi_2(1880). A fourth category of anomalously light 0+ mesons is made of sigma(540), kappa(750), a_0(980) and f_0(980).

121 pages, 81 figures, 6.8 Gbytes. Reprints available from [email protected]

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• Chiral symmetry amplitudes in the s-wave isoscalar and isovector channels and the $\sigma ,f_0(980),a_0(980)$ scalar mesons
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• Resurrection of the Sigma Meson
• Observed D_s(2317) and tentative D(2100-2300) as the charmed cousins of the light scalar nonet
• Experimental evidence for a light and broad scalar resonance in $D^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$ decay
• On the structure of the scalar mesons $f_0(975)$ and $a_0(980)$
• Meson-meson scattering within one loop Chiral Perturbation Theory and its unitarization
• Dalitz Plot Analysis of the Decay D^+ --> K^- pi^+ pi^+ and Indication of a Low-Mass Scalar K pi Resonance
• Putative Light Scalar Nonet
• EVIDENCE FOR A SCALAR GLUEBALL
• Evidence for Exotic Meson Production in the Reaction ${\pi }^{-}p\to \eta {\pi }^{-}p$ at 18 GeV/c
• S-wave Kpi scattering in chiral perturbation theory with resonances
• A new measurement of K+(e4) decay and the s-wave pi-pi-scattering length a00
• Study of the Decay phi --> pi0 pi0 gamma with the KLOE Detector
• Determining the Gluonic Content of Isoscalar Mesons
• Study of the $\varphi$ decays into ${\pi }^0{\pi }^0\gamma$ and $\eta {\pi }^0\gamma$ final states
• K-matrix analysis of the (IJ^{PC}=00^{++})-wave in the mass region below 1900 MeV
• Study of the Decay phi --> eta pi0 gamma with the KLOE detector
• The mixing of the f0(1370), f0(1500) and f0(1710) and the search for the scalar glueball
• Evidence for a scalar kappa(900) resonance in pi-K scattering
• Unitarized pseudoscalar meson scattering amplitudes in three flavor linear sigma models
• A coupled channel analysis of the centrally produced K+K- and pi+pi- final states in pp interactions at 450 GeV/c
• The $\varphi \to \eta {\pi }^0\gamma$ decay
• Analysis of the nature of the $\varphi \to \gamma \pi \eta$ and $\varphi \to \gamma {\pi }^0{\pi }^0$ decays
• Analysis of the nature of the $\varphi \to \gamma \pi \eta$ and $\varphi \to \gamma {\pi }^0{\pi }^0$ decays
• A Glueball- $q\bar{q}$ Filter in Central Hadron Production
• A study of the eta eta channel produced in central pp interactions at 450 GeV/c
• I = 0 C = +1 mesons from 1920 to 2410 MeV
• First Observation of PHI(1020)--->PI0+PI0+GAMMA Decay
• The Mixing Angle of the Lightest Scalar Nonet
• Radiative decays of ϕ-meson and nature of light scalar resonances
• Evidence of the PHI(1020)--->ETA+PI0+GAMMA Decay
• Partial wave analysis of pbar-p annihilation channels in flight with I=1, C=+1
• There is no $\kappa (900)$
• A spin analysis of the 4pi channels produced in central pp interactions at 450 GeV/c
• Partial Wave Analyses of $J/\psi \to \gamma K^{+}{K}^{-}$ and $\gamma K_S^0{K}_S^0$
• Elimination of ambiguities in pion-pion phase shifts using crossing symmetry
• A study of the centrally produced 4pi channel in pp interactions at 450 GeV/c
• Chiral symmetry restoration and the string picture of hadrons
• Modified Breit-Wigner formula for mesonic resonances describing OZI decays of confined $q\bar{q}$ states and the light scalar mesons
• A partial wave analysis of the ${\pi }^0{\pi }^0$ system produced in ${\pi }^{-}p$ charge exchange collisions
• Resonance $f_0(1500)$: Is it a scalar glueball ?
• The glueball spectrum
• Partial Wave Analysis of $J/\psi \to \gamma (K^{\pm }{K}_S^0{\pi }^{\mp })$
• Partial wave analysiss of pbar-p -> piminus-piplus, pizero-pizero, eta-eta and eta-etaprime
• Towards a model independent determination of the phi -> f_0 - gamma coupling
• Dynamics of Glueball and qqbar production in the central region of pp collisions
• Studying Kaon-pion S-wave scattering in K-matrix formalism
• Resonances formed by pbar-p and decaying into pizero-pizero-eta for masses 1960 to 2410 MeV
• A new view of the 0- and 2+ glueballs
• The f2(1565) in pbar-p -> (omega-omega)pizero interactions at rest
• Data on pbar-p -> etaprime-pizero-pizero for masses 1960 to 2410 MeV/c^2
• A study of the omega omega channel produced in central pp interactions at 450 GeV/c
• S-wave Meson-Meson Scattering from Unitarized U(3) Chiral Lagrangians
• Meson model for f_0(980) production in peripheral pion-nucleon reactions

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