We report the results of an experiment which examines the entire final state of events in which muon pairs were produced in 15.5-GeV/c +p interactions. A portion of this data was presented earlier. Here we report on the final data sample of 890 events obtained from a total of 2.5×108 interactions [a sensitivity of (8.65 events/nb)×trigger efficiency]. The experiment was sensitive primarily to the low-mass region and the good mass resolution made it possible to identify the contributions from the and decays and the and Dalitz decays. An excess of events is observed in the dimuon mass region 400 - 600 MeV which is not accounted for by the above-mentioned decays. The final states were examined to search for characteristic differences from those in events without dimuons.
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)