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Protons
(mander.xyz)
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Then watch all protons suddenly burp out a couple of leptons and a photon, instantly decay into some other lower mass thingy.
As long as protons are the lowest mass baryon, there is nothing for them to decay to (barring violation of baryon number conservation).
But surely with a higher mass, they'll be - to quote C3PO here - not entirely stable, with a new lower mass and that particle having another name.