# Do antiquarks cancel quarks out?

I heard that antiquarks are just like antimatter. Does that mean that they cancel quarks out? If so, does that mean that there are more quarks than antiquarks?

• Yes, there are more quarks than antiquarks. Usually people phrase this as "there are more baryons than antibaryons", but a baryon is just 3 quarks. Dec 11, 2018 at 21:43
• @knzhou Since virtually all baryonic matter in the Universe is composed of protons (uud) and, in some cases, neutrons (udd), wouldn't it be more accurate to say that antiquarks are extremely rare? Dec 12, 2018 at 0:52

It is indeed true, that antiquarks are antimatter and annihilate with quarks. As knzhou pointed out in his comment, there are more baryons (3 quarks) than antibaryons (3 antiquarks).

There is also another kind of hadronic (made of quarks) matter, mesons, consisting of one quark and one antiquark each. Those, however, are not stable.

For example, $$\pi^0$$ (a superposition of $$u\bar u$$ and $$d\bar d$$) can decay into two photons, which can be interpreted as the quark-antiquark pair annihilating.