[en] A partial-wave analysis of the mesons from the reaction π^- p → π⁺π^-π^-π⁰π⁰p has been performed. The data show b₁π decay of the spin-exotic states π₁(1600) and π₁(2000). Three isovector 2^-+ states were seen in the ωρ^- decay channel. In addition to the well known π₂(1670), signals were also observed for π₂(1880) and π₂(1970)

[en] The number of pseudoscalar mesons in the mass range from 1400 to 1500 MeV/c² has been a subject of considerable interest for many years, with several experiments having presented evidence for two closely spaced states. A new measurement of the reaction π^- p → K⁺ K^- π⁰n has been made at a beam energy of 18 GeV. A partial wave analysis of the K⁺ K^- π⁰ system shows evidence for three pseudoscalar resonances, η(1295), η(1416), and η(1485), as well as two axial vectors, f₁(1285), and f₁(1420). Their observed masses, widths and decay properties are reported. No signal was observed for C(1480), an I_G J^PC = 1⁺ 1^-- state previously reported in φπ⁰ decay

[en] A partial-wave analysis of the reaction pi^-p-->pi⁺pi^-pi^-p at 18 GeV/c has been performed on a data sample of 250 000 events obtained in the Brookhaven experiment E852. The well-known a₁(1260), a₂(1320) and pi₂(1670) resonant states are observed. The existence of the pi(1800), a₁(1700) and a₄(2040) states is confirmed. The a₃(1874) state is also observed. The exotic 1^-+ pi₁(1600) state produced in the natural parity exchange process is found to decay in the rho(770)pi^- channel. A mass-dependent fit results in a resonance mass of 1593±8_-47⁺²⁹ MeV/c² and a width of 168±20_-12⁺¹⁵⁰ MeV/c²

[en] New measurements of peripheral meson production are presented. The data confirm the existence of exotic mesons at 1.4 and 1.6 GeV/c2. The latter state dominates the eta'pi- decay spectrum. The data on eta pi+pi-pi- decay show large strength in several exotic (Jpc = 1- +) waves as well