SINGLE-PION PRODUCTION IN PI-P INTERACTIONS AT 2.26-GEV/C

We present an analysis of ππN final states obtained from π-p interactions at 2.26 GeV/c. Strong ρ production is present in both final states. In addition, significant nucleon isobar production is observed. We observed the following cross sections: σ(π-π0p)=3.77±0.13 mb, σ(π-π+n)=5.67±0.17 mb, σ(ρ-p)=2.19±0.09 mb, σ(Δ+(1236)π-)=0.30±0.10 mb, σ(N0(1650)π0)=0. 49±0.07 mb, σ(ρ0n)=2.89±0.11 mb, σ(Δ-(1236) π+)=0.11±0.06 mb, σ(N+(1470)π-)=0.24±0.06 mb, and σ(N+(1650)π-)=0.45±0.05 mb. The spin-density matrix elements are determined for the ρ0 by interpreting the ρ0 asymmetry as an interference between the resonant P wave and a T=0 S wave. A search for the ε0 in the π+π-n final state failed to yield a direct observation of this effect. © 1969 The American Physical Society.