Pion Production in Antiproton-Proton Annihilations at3.3 and 3.7 BeVc

Abstract

A study of antiproton-proton collisions at $3.3 \mathrm{and} 3.7 \frac{\mathrm{BeV}}{c}$ indicates that (41±4)% of the total interaction cross section can be attributed to annihilation into pions. The average pion multiplicity is 6.5±0.5. The positively charged pions and dipions tend to be emitted backward, while the negatively charged pions and dipions tend to be emitted forward in the center-of-mass system. Although there is a substantial amount of resonance production, especially of $\rho$ and of $\omega$ mesons, there is no clear evidence for double or associated resonance production in these final states. A search for new resonances as well as for some of the recently discovered mesons proved unsuccessful.