composite particle made up of an even number of elementary particles, most commonly one particle and one anti-particle.
This can be contrasted with mesons, which have an odd number of elementary particles, as mentioned at baryon vs meson vs lepton.
Conceptually the simplest mesons. All of them have neutral color charge:
  • charged: down + anti-up or up + anti-down, therefore with net electrical charge electron charge
  • neutral: down + anti-down or up + anti-up, therefore with net electrical charge 0
One strange quark bound with one up quark or a down quark. 6 combinations exist, 4 if we consider antiparticles the same as particles.

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