Multiple pion production (without annihilation) in\bar p - p collisions at 7 GeV/ccollisions at 7 GeV/c

Preliminary results of an investigation of multiple pion production without annihilation in antiproton-proton collisions at 7 GeV/c exhibit highly peripheral characteristics. The experimental distributions in the reaction\(\bar p + p \to \bar p + p + \pi ^ + + \pi ^ - \) are consistent with a one-pion-exchange mechanism particularly for low four-momentum transfers. The cross-section for multipion production without annihilation is ∼20 mb.