Electronic display of decay of an upsilon

Electronic display of decay of an upsilon

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Caption: Electronic display of the decay of an upsilon - a particle made of a bottom quark & antiquark - in the CLEO detector at the CESR collider at Cornell University. An electron & a positron have met & annihilated at centre; their energy produces an excited upsilon, which lives too briefly to show. It decays into a lower energy state by emitting a photon which converts into the curving electron (green) & positron (red). The lower- energy upsilon then decays to its ground state by emitting another photon, detected at bottom right (blue). The ground-state upsilon decays to a high- energy electron-positron pair (green & red long tracks).

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Keywords: antimatter, bottom, bottom particle, bottom quark, cesr collider, cleo detector imagery, computer screen, electron-positron pair, electronic display, odyssey, particle physics research, quark, upsilon particle

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