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Observation of an Anomalous Number of Dimuon Events in a High Energy Neutrino Beam

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arxiv hep-ex/0104037 v2 pith:2M5ZTZEK submitted 2001-04-19 hep-ex

Observation of an Anomalous Number of Dimuon Events in a High Energy Neutrino Beam

classification hep-ex
keywords eventsweredecayobservedparticlesaboveanomalousbackground
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A search for long-lived neutral particles (N^0'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 mu mu, mu e, and mu pi. Three mu mu 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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