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Phys Rev Lett. 2001 Jul 23;87(4):041801. doi: 10.1103/PhysRevLett.87.041801. Epub 2001 Jul 06.

Observation of an anomalous number of dimuon events in a high energy neutrino beam.

Physical review letters

T Adams, A Alton, S Avvakumov, L de Barbaro, P de Barbaro, R H Bernstein, A Bodek, T Bolton, J Brau, D Buchholz, H Budd, L Bugel, J Conrad, R B Drucker, B T Fleming, R Frey, J A Formaggio, J Goldman, M Goncharov, D A Harris, R A Johnson, J H Kim, S Koutsoliotas, M J Lamm, W Marsh, D Mason, J McDonald, C McNulty, K S McFarland, D Naples, P Nienaber, A Romosan, W K Sakumoto, H Schellman, M H Shaevitz, P Spentzouris, E G Stern, N Suwonjandee, M Tzanov, M Vakili, A Vaitaitis, U K Yang, J Yu, G P Zeller, E D Zimmerman

Affiliations

  1. Kansas State University, Manhattan, Kansas 66506, USA.

PMID: 11461608 DOI: 10.1103/PhysRevLett.87.041801

Abstract

A search for long-lived neutral particles ( N0's) with masses above 2.2 GeV/c(2) that decay into at least one muon has been performed using an instrumented decay channel at the NuTeV experiment at Fermilab. Data were examined for particles decaying into the final states mumu, mu(e), and mu(pi). Three mumu events were observed over an expected standard model background of 0.069+/-0.010 events; no events were observed in the other modes.

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