A Question about Spin Induced Magnetic Moment

  • #1

Main Question or Discussion Point

Does photon has spin induced magnetic moment? I think the answer is no. But why? You know, electron has. Does this have something to do with the fact that electron is massive while photon massless?:confused:
 

Answers and Replies

  • #2
Bill_K
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Primarily, it's because the electron is a charged particle and the photon is not.
 
  • #3
Some guy says it has something to do with photon's charge conjugation quantum number. If you have two photons' wave function [tex]\Psi_{p,\sigma}, \Psi_{p',\sigma'}[/tex], you can couple them to a electromagnetic current to measure the interaction and magnetic moment:

[tex](\Psi_{p',\sigma'},J^\mu\Psi_{p,\sigma})[/tex]

But RHS has charge conjugation number +1 while LHS has charge conjugation number -1. So it's zero!

I couldn't understand charge conjugation quantum number, though this theory sounds fancy.
 

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