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Production of an electron-positron pair, matter & antimatter, in the ALEPH detector at CERN, the European particle physics lab outside Geneva. In this electronic display, the basically cylindrical detector is outlined in white & blue. An electron and positron, accelerated to high energy in CERN's LEP collider, have entered (unseen) from left & right & annihilated in the centre of the detector to produce sprays of charged particles (blue dotted tracks). Also produced is an unseen gamma- ray photon, which materialises as matter and antimatter in the form of an electron (yellow) and positron (red). Because they are of lower energy, they travel in spirals in ALEPH's magnetic field.
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