Abstract
The properties of the dimuon enhancement seen in 400-GeV proton-nucleus collisions have been clarified by a threefold increase in data. We find two peaks whose widths are consistent with our resolution: GeV with /nucleon and GeV with /nucleon. Evidence for the possible existence of a third peak near 10.4 GeV is discussed as are the comparisons with the properties of a system, where is a new heavy quark.
- Received 9 September 1977
DOI:https://doi.org/10.1103/PhysRevLett.39.1240
©1977 American Physical Society