6.1 The quark model predicts the existence of baryons and mesons.
6.2 The quark model explains the hadronic spectrum.
2.2 The concept of the neutrino was first proposed by Pauli in 1930.
9.1 The gauge group of QED is $U(1)$.
1.3 The antiparticle of the electron $e^{-}$ is the positron $e^{+}$.
9.2 The gauge group of QCD is $SU(3)$.
6.1 The quark model predicts the existence of baryons and mesons.
6.2 The quark model explains the hadronic spectrum.
2.2 The concept of the neutrino was first proposed by Pauli in 1930.
9.1 The gauge group of QED is $U(1)$.
1.3 The antiparticle of the electron $e^{-}$ is the positron $e^{+}$.
9.2 The gauge group of QCD is $SU(3)$.
