Four Sorts of Mesons

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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).

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