Griffiths Introduction to Elementary Particles · Problem 2.6

Relativistic Kinematics — David J. Griffiths

Physics — QFT · feynman-diagrams-electroweak

Problem

Draw all the lowest-order diagrams contributing to the process

e^+ + e^- \rightarrow W^+ + W^-

. [One of them involves the direct coupling of

Z

W

's and another the coupling of

\gamma

W

's, so if a positron-electron collider is ever built with sufficient energy to make two

W

's, these interactions will be directly observable.]