All baryons eventually decay into protons, and this principle applies to anti-baryons as well. The lightest anti-baryon is the antiproton, which is stable against decay, similar to protons. However, antiprotons will eventually encounter protons, leading to annihilation. This process is well-documented in particle physics, particularly in the context of proton-antiproton annihilation.
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jtbell said:The lightest anti-baryon is the antiproton, so any anti-baryon will eventually decay to an antiproton.
Antiprotons are stable against decay (so far as we know), just like protons. However, sooner or later (probably sooner) an antiproton will encounter a proton and the two will annihilate:
http://en.wikipedia.org/wiki/Annihilation#Proton-antiproton_annihilation