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How does the OPERA detector know which neutrinos come from CERN and not from elsewhere?
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I tried clawing my way through OPERA's recent publication but I can't find a clear answer on how they know the ~15000 events all constitute CERN neutrinos and are not instead contaminated with, say, solar neutrinos or the cosmic neutrino background. It would follow that if you can't accurately determine the origin of the neutrinos, timing their flight using the data from the two muon detectors is a moot undertaking.
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