Event
Event
When one W decays to produce an electron
and a neutrino, and the other W decays to produce a quark
and an antiquark we see events containing an electron, an
(invisible) neutrino and two jets:
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Side View of Event
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The neutrino leaves no signals in the detector. However, we can deduce its momentum by using the principal of conservation of momentum
End-On View of Event with Missing Momentum Vector Drawn
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Some 
example events 
How to Identify Events Containing a Pair of
W Particles
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