A study of the reaction π−p → π+π−n at 100 and 175 GeV/c

Abstract The reaction π − p → π + π − n was studied at 100 and 175 GeV/ c incident beam momenta. The ϱ 0 region cross section was 0.934 μb at 100 GeV/ c and 0.229 μb at 175 GeV/ c . Spherical harmonic moments in the Gottfried-Jackson frame are presented as a function of mass and proton-neutron four-momentum transfer. The pion Regge trajectory is calculated. Decay distributions are presented for the ϱ in the helicity and Gottfried-Jackson frames. The apparatus and analysis are discussed.