What makes the decay of protons?

How all the baryons except protons broke apart in the universe

As there are no baryons lighter than a proton, its baryon charge would disappear if it decayed. For this reason, the proton lifetime is immeasurably greater than that of other baryons. Decays changing the value of baryon charge has been predicted by Howard Georgi and Sheldon Glashow for the case if the theory of unification of fundamental interactions of elementary particles is true. In that case, the decays of protons would be accompanied by the creation of virtual particles with a great mass, which should happen extremely rarely but very likely in the early universe. It is possible that such processes are responsible for the almost complete absence of antibaryons in our universe. In our era, they watch a huge number of protons contained in 50 thousand cubic meters of water to detect at least several proton decays in the Super-Kamiokande experiment.

Detector for registration of proton decays in the  Super-Kamiokande experiment

Looking for a needle in a haystack is much easier.

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