M J dfx kW p

where |p) is the state with one neutral particle with momentum p and \kk') is the state with a charged particle with momentum k and a charged antiparticle with momentum k'.

(c) When is the matrix element evaluated in part (b) not equal to zero, and what is its physical significance?

7.5 Construct a theory in which it is possible for two particles to scatter and produce a third (2 —► 3) at a single point in space-time.

Relativistic Quantum Mechanics and Field Theory

FRANZ GROSS Copyright© 2004 WILEY-VCH Verlag GmbH

CHAPTER 8

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