POLARIZATION IN PI-P-]ETAN, DOUBLE-POLE A2 AND A POSSIBLE PION CONSPIRATOR

The π-p→ηn differential-cross-section data are analyzed within the Regge framework, using two A2 trajectories which are constrained to reproduce the double-pole characteristics at J=2, t=(1.3 GeV)2 of the A2 mass distribution. The best fit yields an upper trajectory degenerate with that for the ρ and a lower-lying trajectory degenerate with that for the pion at t=0 (a possible pion conspirator). The calculated neutron polarization is in reasonable agreement with new measurements, although these data were not employed in the fitting. © 1968 The American Physical Society.