Angular correlations in the decayτ→ντρπ

Abstract

In this paper we stress the utility of measuring the angular distribution in the decay $\ensuremath{\tau}\ensuremath{\rightarrow}{\ensuremath{\nu}}_{\ensuremath{\tau}}\ensuremath{\rho}\ensuremath{\pi}$ as a source of information not readily available from the total rate of the $\ensuremath{\rho}\ensuremath{\pi}$ mass spectrum. We propose that the angular information be extracted by measuring two angular asymmetry parameters. These asymmetries will prove useful in determining the helicity structure of the interaction and in establishing the existence and properties of the ${A}_{1}$ or any other structure in the $\ensuremath{\rho}\ensuremath{\pi}$ system.