Introduction To Elementary Particles Solutions Manual Griffiths Guide

9.1 The gauge group of QED is $U(1)$.

This solutions manual provides a comprehensive guide to the exercises and problems in "Introduction to Elementary Particles" by Griffiths. The solutions are presented in a clear and concise manner, making it an invaluable resource for students and researchers alike.

7.1 The weak interaction is responsible for $\beta$ decay.

7.2 The $W$ and $Z$ bosons mediate the weak interaction.

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