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A partial wave equation was used to fit most of the recent pi + p differential cross section measurements above 1 GeV/c. Differential cross section measurements of pi( - ) + p at 2.01 GeV/c and of pi(+) + p at 2.02 GeV/c previously published only in graphical form are given in the appendix.
A recent spin parity analysis of the (pi /sup +/ pi /sup +/ pi /sup -/) system formed opposite a proton and a coherent deuteron by incident 13 MeV/c/sup 2/ pi /sup +/ mesons, is extended to a three pion mass of 1.9 GeV/c. Relative proportions of the contributing partial waves are presented, ffrom threshold, and the A/sub 3/ region is discussed in detail. Contrary to results with the (3 pi)/ sup -/ system, a change in phase is noted for the 2/sup -/ amplitade decaying to f/sup o/ pi /sup +/ via an S-wave. The method employs the University of Illinois three body partial wave analysis program. (auth).
The first results from an isobar-model phase shift analysis of the eta..pi ... pi..− system are presented. Particular emphasis is given to an unambiguous determination of the spin-parity of the D(1285) meson.