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## 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?

- Thread starter qinglong.1397
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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?

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Bill_K

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Primarily, it's because the electron is a charged particle and the photon is not.

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[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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