See a muon in CMS, nu?

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    A muon (red track) emerges from a collision and penetrates all the way out of the detector; we use conservation of momentum to calculate the trajectory of an unseen neutrino (green arrow) that rebounds off the muon. Combining these two gives a net energy of 75.3 GeV - close to the mass of the W boson. This is a good candidate for the decay of a W into a muon and a neutrino.
    Copyright CERN for the benefit of the CMS Collaboration

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