Two baryons interact to produce pions only, the original baryons disappearing.One of the baryons must have been:

Question

Quizplus · Accepted Answer

For two baryons to interact and produce only pions, with the original baryons disappearing, one of the baryons must be an antiparticle of the other. This is because baryon number is conserved in particle interactions, and the only way for the baryons to disappear is if one is a matter baryon and the other is its corresponding antimatter counterpart, leading to annihilation and the production of pions.

Two Baryons Interact to Produce Pions Only, the Original Baryons