Caption: Electronic display of a simulated proton decay event in the IMB detector. (For details of the detector & how to interpret this display, see description of A142/156.) The display simulates the simple form of proton decay predicted by the SU-5 theory, in which a proton decays into a positron & a neutral pion which move in opposite directions away from the point of the decay. Such an event would cause two rings of light to be seen on the walls of the IMB detector. In this display the tracks of the decay particles are reconstructed in the left-hand part of the cube, the positron as a short yellow track, the pion - which immediately decays in its turn into two photons - as the green fork. The rings of light on the walls are at left & bottom. If the SU-5 theory was correct, the IMB experiment should have seen about 2000 events like this each year, but in
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