Search for narrow structures in thep¯pannihilation cross section from 1925 to 1960 MeV

Abstract

The $\overline{p}p$ annihilation cross section has been measured over the mass range 1925-1960 MeV with a rms resolution of ±2.5 MeV. This search yields no evidence for narrow enhancements in this mass interval. Using an $A+\frac{B}{p}$ parameterization of the background, a 2-standard-deviation upper limit of 16 mb MeV is set for the integrated area of any resonance with mass between 1936 and 1942 MeV and width ≲4 MeV.