Author/Authors :
A.V. Anisovich، نويسنده , , C.A. Baker، نويسنده , , C.J. Batty، نويسنده , , D.V. Bugg، نويسنده , , L Montanet، نويسنده , , V.A. Nikonov، نويسنده , , A.V. Sarantsev، نويسنده , , V.V Sarantsev، نويسنده , , B.S. Zou، نويسنده ,
Abstract :
New Crystal Barrel data are reported for p̄p→ωπ0 and p̄p→ωηπ0 with ω decaying to π+π−π0. The shapes of angular distributions agree well with those for data where ω→π0γ; this is a valuable cross-check on systematic errors. The new data provide good measurements of vector and tensor polarisations Py, T20, T21 and T22 of the ω. These lead to significant improvements in parameters of several resonances reported earlier. New values of masses and widths (in MeV) are: JPC=5−− (2300±45, 260±75), JPC=3−− (2260±20, 160±25), JPC=1+− (2240±35, 320±85), and JPC=1−− (2110±35, 230±50). A remarkable feature of the data is that vector polarisation Py is close to zero everywhere. It follows that all interfering amplitudes have relative phases close to 0 or 180°. Tensor polarisations are large.
