"Compute the lowest-order Feynman diagram for Bhabha scattering ($e^+ e^- \to e^+ e^-$) in the $t$-channel and $s$-channel. Show that the amplitude is symmetric under $s \leftrightarrow t$ when you exchange the final particles."
4.2 The symmetry groups are:
The Standard Model of particle physics is a theoretical framework that describes the behavior of all known elementary particles and their interactions. The model consists of two main types of particles: fermions (matter particles) and bosons (force-carrying particles). Fermions are particles that have half-integer spin, while bosons have integer spin.
The by David J. Griffiths is a staple textbook for undergraduate and graduate physics students. A comprehensive Instructor's Solution Manual