Abstract
We have performed a search for the state of charmonium resonantly formed in p¯p annihilations, close to the center of gravity of the states. We report results from the study of the J/ψ+ and J/ψ+2π final states. We have observed a statistically significant enhancement in the p¯+p→J/ψ+ cross section at √s ≃3526.2 MeV. This enhancement has the characteristics of a narrow resonance of mass, total width, and production cross section consistent with what is expected for the state. In our search we have found no candidates for the reactions p¯+p→J/ψ++ and p¯+p→J/ψ++.
- Received 10 July 1992
DOI:https://doi.org/10.1103/PhysRevLett.69.2337
©1992 American Physical Society