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Production and decay of photons

Production and decay of photons

A142/0440

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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

Production and decay of photons in the L3 detector at CERN, the particle physics laboratory outside Geneva. In this computer display, the detector is represented schematically in white. An electron & positron, accelerated to high energy in CERN's LEP collider, have entered unseen from left and right along the beam pipe that runs through the detector & annihilated at centre. Their energy materialises in the form of a new electron & positron (blue tracks & 'towers') and 3 photons. Being neutral, the photons leave no track, but are detected when they deposit energy (red towers) in L3's electro- magnetic calorimeter. The photon is the carrier particle of the electromagnetic force.

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