Observation Of Structure In -Pp And -Pd Total Cross-Sections Below 1.1 Gev-C

Total cross sections of $\overline{p}p$ and $\overline{p}d$ have been measured between 360 and 1050 MeV/c, with high statistical precision. Structures are observed in both cross sections at about the same momenta. For $\overline{p}p$, the central mass is 1932\ifmmode\pm\else\textpm\fi{}2 MeV/${\mathit{c}}^{2}$, and a fit to the data with a simple Breit-Wigner resonance plus background gives $\ensuremath{\Gamma}={9}_{\ensuremath{-}3}^{+4}$ MeV/${\mathit{c}}^{2}$. The data suggest that the structures are in the isospin-1 state.