Evidence for a destructive interference effect between the p^ and CJ-^TT^TT" amplitudes has been observed in the channel 7r+^-*7r+7r"A^ at 3.7-4.0 GeV/c. On the assumption of complete coherence between the p^ and CJ-^TT^TT"" amplitude in a subsample, discussed in the text, a branching ratio (a;-^7r^7r~)/(a)-*7r"^7r~'7r^) = 1.5% is obtained with a 95% confidence-level lower limit of 0.25%. The data do not lead to a significant upper limit. In terms of 6, the off-diagonal element of the p^cj mass-mixing matrix, these values are equivalent to 6 = 2.7 MeV and a lower limit of 1.1 MeV. Under conditions stated in the text, a value j3 = 1.5±0.3 rad is obtained for the production phase of p^ relative to co in the channel studied.
3177where Q i s the c.m. momentum of the 9, and q the momentum of the K mesons in the C r e s t frame. 4 2~. Alvensleben et a1 . , Phys. Rev. Letters 28, 66 (1972).
3~.The results of a study of strange-particle production in rrtp interactions at 3 . 7 GeV/c a r e presented. Cross sections for a large number of strange-particle final states a r e given; the over-all strange-particle production cross section i s about 1.3 mb. Comparison of crosssection results on two-body and quasi-two-body final states with corresponding s-p data shows no evidence for exotic exchanges. Comparison of the peripheral cross sections for rr'p -K t X+ and n+p -K + Z + ( 1 3 8 5 ) with those for the line-reversed reactions shows reasonable agreement for K+ Ct and gross disagreement for K t Zt (1385). Simultaneous K*'(891) 2 ' (1385) production occurs, but, unlike its nonstrange counterpart, it is not dominated by pseudoscalar exchange. There i s significant @(1019) production via the reaction n+p -@ n t p , but none of it appears to be associated with A T f ( 1 2 3 6 ) . Cross sections for resonance production in various three-and four-body final states a r e presented.
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