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ATLAS reaches for the top

Top quarks from proton collisions are usually found in pairs: a top quark and its antimatter partner (antitop). Each of these most likely decays into a W boson and a b quark. In this top-antitop candidate from ATLAS, one W seems to have decayed into an electron and a neutrino, the other W and the b quarks into jets. The "lego plot" at the bottom right tells most of the story: four jets show up as yellow towers and the electron as a lone green tower. The neutrino is counted as "missing energy."

Copyright 2010 The ATLAS Experiment at CERN

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Taken on August 19, 2010