Search

Resonances with the exotic quantum numbers JPC = 1-+ are observed in ρπ at m = 1400 – 1480 MeV/c² and in b1 π at 1600 MeV/c². Comparison of the S- and P-wave &pmacr;n branchings leads to the conclusion that the present ρπ resonance is different from the exotic ηπ resonance found in previous annihilation studies. Excited α1 and π states are observed in the ρπ, ρ′π and ρω systems. Further evidence for the 2-component character of the E/i(1440) is found in its ση decay. A study of ωπ decay of excited ρ states supports the existence of a ρ′ about 250 MeV/c² below the ρ′(1450). [ABSTRACT FROM AUTHOR]

The preliminary results of the analysis of &pmacr;n → π[sup -]3π[sup °] annihilation at rest are presented. About 205.520 events were taken with the Crystal Barrel Detector with a liquid deuterium target. A full four-body-partial wave analysis with the maximum likelihood method was applied for a part of this sample. The dominant intermediate states in the data consist of a ρ-meson combined with the (ππ) S-wave or with the D-wave (f[sub 2](1270)). Beneath the well established resonances the partial wave analysis yields a broad resonant structure in the exotic (pπ) P-wave at about 1500MeV/c². In addition, the (pπ)-system is found in the a[sub 1](1260), a[sub 1] (1640), a[sub 2](1320), a[sub 2](1650), π(1300) and π(1800) states. [ABSTRACT FROM AUTHOR]