\Anfc2!

is the state of mjt2 photons with momentum k2 and polarization q2. (b) Discuss the physical significance of your result.

2.4 The orbital part of the angular momentum operator fllL was defined in Eq. (2.60). Prove that it contains no terms of the form ah^a^,^, or 0-n,a0-n',a'< and also show that where |ljt) is the state of one photon with momentum k and polarization a. What is the significance of this result?

Relativistic Quantum Mechanics and Field Theory

FRANZ GROSS CopyrightÂ© 2004 WILEY-VCH Verlag GmbH

CHAPTER 3

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