Introduction To Elementary Particles Solutions Manual Griffiths | Editor's Choice

2.3 The $\pi$ meson was discovered in 1947 by Cecil Powell.

5.1 The quark content of the proton is $uud$.

1.3 The antiparticle of the electron $e^{-}$ is the positron $e^{+}$.

6.2 The quark model explains the hadronic spectrum.

2.2 The concept of the neutrino was first proposed by Pauli in 1930.