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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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