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7 TeV ATLAS event

The single straight track in yellow on the right ends in a shower of energy in the electromagnetic calorimeter: this is a positron. To balance momentum, there must be an unseen partner particle--a ghostly neutrino. Its projected path is shown as a red dashed line. A positive W-boson can decay into a positron and a neutrino--and that is what the ATLAS people tell us this most likely is, a good candidate for a W decay.

Copyright 2010 The ATLAS Experiment at CERN

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Taken on May 20, 2010