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Meson, Baryon

  1. Jul 2, 2012 #1
    Mesons are bosons, while the baryons are fermions.

    My question is, meson is a type of hadron that made from the interaction of quark with gluon. Quark is fermion, not boson. so why mesons are boson?
  2. jcsd
  3. Jul 2, 2012 #2
    Bosons are particles with integer spin. Each quark has a half integer spin. When the quarks combine to form mesons and baryons, their spin numbers add together. Because there are two quarks in a meson, their spins add up do an integer spin, making it a boson.
  4. Jul 2, 2012 #3
    Whether a particle is considered a fermion or boson depends on its spin. Composite particles such as mesons and helium-4 atoms are considered bosons because they contain an even number of fermions and thus have integer spin. This is in contrast to particles such as protons, neutrons, and helium-3 atoms which contain an odd number of fermions and have half-integer spin.

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