Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2011-09-24
Phys.Lett.B542:8-18,2002
Physics
High Energy Physics
High Energy Physics - Experiment
Makes available the final combined analysis of data with I=1, C = -1 with almost a complete spectrum of expected mesons. 14 pa
Scientific paper
10.1016/S0370-2693(02)02302-X
New Crystal Barrel data are reported for pbar-p -> omega-pizero and pbar-p -> omega eta-pizero with omega decaying to piplus-piminus-pizero. The shapes of angular distributions agree well with those for data where omega -> pizero-gamma; this is a valuable cross-check on systematic errors. The new data provide good measurements of vector and tensor polarisations P_y, T20, T21 and T22 of the omega. These lead to significant improvements in parameters of several resonances reported earlier. New values of masses and widths (in Mev) are: J^PC = 5^-- (2300+-45, 260+-75), J^PC = 3^-- (2260+-20, 160+-25), J^PC = 1^+- (2240+-35, 320+-85), and J^PC = 1^-- (2110+-35, 230+-50). A remarkable feature of the data is that vector polarisation P_y is close to zero everywhere. It follows that all interfering amplitudes have relative phases close to 0 or 180 deg. Tensor polarisations are large.
Anisovich A. V.
Baker Amanda C.
Batty Clair J.
Bugg D. V.
Montanet L.
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