SPIN ANALYSIS OF PPI+PI-ENHANCEMENTS IN PPPI+PI-FINAL STATE PRODUCED IN PP INTERACTIONS AT 22 GEV/C

We have investigated decay angular distributions and other characteristics associated with enhancements near 1450 and 1700 MeV in the p+- mass distribution for the pp+- final state produced in pp interactions at 22 GeV/c. Our results are consistent with a spin assignment of for the 1450-MeV effect if the ++- branching of this effect is assumed to be small. We associated this effect with the P11(1470) state inferred from phase-shift analyses. In the case of the 1700-MeV feature, we favor strong contributions from a J=52+ state which can be reasonably associated with the F15(1690) state reported in the phase-shift work. © 1969 The American Physical Society.