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Z particle decay to muon & antimuon. Electronic display of an electron-positron collision in the ALEPH detector at CERN, the European particle physics laboratory near Geneva. The display shows a cross-section of the detector, with the beam tube in the centre (blue) surrounded by various detector components (blue & red). The electron and positron, accelerated to high energy in CERN's LEP collider, annihilate at centre to create a neutral Z particle (one of the carriers of the weak nuclear force). Although too short-lived to be detected directly, the Z reveals itself when it decays into a muon & an antimuon (yellow tracks), which fly off back-to-back through the detector.
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