High-Statistics Investigation of the BroadTandUPeaks in Antiproton Interactions

Abstract

We observed broad bumps at 2193 and 2359 MeV in the elastic, inelastic, and annihilation $\overline{p}p$ cross sections. We find that the positions and widths of the structures are invariant to changes in the multiplicity and degree of nonperipheralism. Multiplicity distributions indicate that the structure at 2193 has no contribution from single $\pi$ production, while as much as 40% of the structure at 2359 could be due to this process.