Confirmation of a0(1450) and π1(1600) in p̄p→ωπ+π−π0 at rest

Crystal Barrel data are presented for p p→ωπ + π − π 0 at rest, with ω → π + π − π 0 . A small but definite signal confirms a 0 (1450) decaying to ωρ . Its branching ratio to ωρ is a factor 10.7±2.3 larger than to ηπ , where it was first identified. When fitted with a Breit–Wigner amplitude which includes the s -dependence of the ωρ channel, the pole position is M =1440 +40 −15 − i (55±7) MeV. The exotic π 1 (1600) is observed decaying to b 1 π with orbital angular momenta L =0 and 2. There is also a strong J PC =1 ++ signal consistent with a 1 (1640) decaying to ωρ and a much weaker signal for decays to [ b 1 (1235) π ] L =1 . The strongest contribution to the data is a J PC =0 −+ signal in ωρ suggesting a pole at M =1470±15− i (57±7) MeV.