Observation of an Anomalous Number of Dimuon Events in a High Energy Neutrino Beam
NuTeV Collaboration: 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
TL;DR
The NuTeV experiment observed an unexpected excess of dimuon events that could suggest the presence of long-lived neutral particles, challenging standard model predictions.
Contribution
This study reports the first observation of an anomalous number of dimuon events in a high energy neutrino beam, indicating potential new physics beyond the Standard Model.
Findings
Observed 3 mu mu events vs. expected 0.069 events
No events observed in mu e and mu pi modes
Results suggest possible new long-lived neutral particles
Abstract
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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