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pions × 208particle-physics × 104
standard-model × 79
nuclear-physics × 41
quantum-field-theory × 34
conservation-laws × 31
quarks × 27
mesons × 27
strong-force × 25
isospin-symmetry × 23
quantum-chromodynamics × 22
angular-momentum × 18
parity × 17
weak-interaction × 16
symmetry-breaking × 15
homework-and-exercises × 13
feynman-diagrams × 13
protons × 10
quantum-spin × 7
gluons × 7
photons × 6
symmetry × 6
quantum-mechanics × 5
special-relativity × 5
neutrinos × 5