Quantum Mechanics in Three Dimensions — David J. Griffiths
Physics — Quantum Mechanics · quark_spin
Problem
Quarks carry spin 1/2. Three quarks bind together to make a baryon (such as the proton or neutron); two quarks (or more precisely a quark and an antiquark) bind together to make a meson (such as the pion or the kaon). Assume the quarks are in the ground state (so the orbital angular momentum is zero).
(a) What spins are possible for baryons?
(b) What spins are possible for mesons?