Pii: s0370-2693(02)02194-9

semanticscholar(2002)

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Abstract
The reactionπ−p → ωπ−p, ω → π+π−π0 has been studied at 18 GeV /c. The ωπ− mass spectrum is found to be dominated by theb1(1235). Partial Wave Analysis (PWA) shows that b1 production is dominated by natural parity exchange. The S-wave andD-wave amplitudes forb1(1235) → ωπ have been determined, and it is found that the amplitude ratio, |D/S| = 0.269± (0.009)stat± (0.01)sysand the phase difference, φ(D−S) = 10.54◦ ± (2.4◦)stat± (3.9◦)sys.  2002 Elsevier Science B.V. All rights reserved.
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