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Z particle decay in ALEPH detector, CERN

Z particle decay in ALEPH detector, CERN

A142/0437

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Credit

CERN / SCIENCE PHOTO LIBRARY CERN / SCIENCE PHOTO LIBRARY

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Editorial use only. This image may not be used to state or imply endorsement by CERN of any product, activity or service.

Caption

Z particle event. Electronic display of an electron-positron collision in the ALEPH detector at CERN, the particle physics lab 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 & positron, accelerated to high energy in CERN's LEP collider, annihilate at centre & create a Z particle (one of the carriers of the weak nuclear force). The Z lives too briefly to be detected, but is revealed when it decays to a muon & antimuon (yellow tracks at left) & a photon. The neutral photon leaves no track but deposits energy (upper right) in one of ALEPH's layers.

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