Abstract
We have carried out a partial-wave analysis (PWA) of three-pion systems produced in the coherent dissociation of ${\ensuremath{\pi}}^{+}$ mesons on nuclear targets. The data have been analyzed for copper and lead targets at an incident ${\ensuremath{\pi}}^{+}$ energy of 202.5 GeV. This PWA provides further evidence for resonant contributions to ${J}^{P}={1}^{+} \mathrm{and} {0}^{\ensuremath{-}}$ waves at $3\ensuremath{\pi}$ masses below 1.5 GeV, which can be plausibly identified with ${A}_{1}$ and ${\ensuremath{\pi}}^{\ensuremath{'}}$ mesons. The contribution from electromagnetic production of the ${A}_{2}$ has also been extracted, and an estimate for Coulomb production and radiative width of the ${A}_{1}$ has been obtained.
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