Matter - Antimatter interactions

[Eryndel]

Just curious.

I know that antiproton will annihilate with a proton, but is that the only baryon which will react with a proton in such a way. Specifically, do the specific constituent quarks annihilate with their antimatter counterpart or do they only annihilate in the proper 2 and 3 quark combination. For example, if you brought an anti-Sigma(+) {uus} in contact with a proton {uud} will the u - u combinations annihilate and leave a neutral kaon {ds} and a couple gammas?

Or does confinement prevent such a thing from happening?

Thanks.

 

[Meir Achuz]

Just curious.

Specifically, do the specific constituent quarks annihilate with their antimatter counterpart or do they only annihilate in the proper 2 and 3 quark combination. For example, if you brought an anti-Sigma(+) {uus} in contact with a proton {uud} will the u - u combinations annihilate and leave a neutral kaon {ds} and a couple gammas?

Or does confinement prevent such a thing from happening?
(NO)
Thanks.

Yes, the antiSigma and the proton would annihilate into a k and several pions. The general rule is that anything that can happen, will happen.