Quasi-Elastic Production of Charmed Baryons by Neutrinos.

The data from the E776 WBB neutrino ( nu_mu) run and the antineutrino (| nu_mu) run have been analyzed for the presence of opposite sign dimuon events. The experiment was performed at the Alternating Gradient Synchrotron (AGS) at Brookhaven National Laboratory (BNL), Upton, New York. The data samples were based on 1,377K AGS pulses of neutrino run and 1,256K AGS pulses of anti-neutrino run. The number of events observed is consistent with the background rate expected for both the neutrino and antineutrino runs. We conclude that there is no evidence for observation of charmed particle production. The expected number of events based on the current theoretical value of cross section times branching ratio for the various charmed particles and the neutrino flux and the acceptance is 0.14. For the antineutrinos, the expected number is nearly zero. as the quasi-elastic production of charmed baryons by antineutrinos is forbidden.