xii
K Example of a Cross Section Calculation
411
K.1 The spin-averaged squared matrix element . . . . . . . . . . 413

K.2 Evaluation of two-body Lorentz-invariant phase space in ‘laboratory’ variables . . . . . . . . . . . . . . . . . . . . . . . . 413
L Feynman Rules for Tree Graphs in QED
417
L.1 External particles . . . . . . . . . . . . . . . . . . . . . . . . 417
L.2 Propagators . . . . . . . . . . . . . . . . . . . . . . . . . . . 418

L.3 Vertices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 418
References
421
Index
427