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Is there precision experimental evidence for or contradicting Furry's theorem -- that only even degree VEVs are non-zero, specifically for the EM field?

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Furry's theorem is a consequence of charge conjugation symmetry in QED. This symmetry is violated by the weak interactions, so I am not sure the theorem is still valid (as a precision experimental fact). –  user566 Dec 23 '11 at 19:14
Thanks, Moshe, I knew I wasn't quite getting the Question right, but I think you've given the Answer to the Question I was trying to ask. Small, because it's electroweak, but I take it there will be odd degree VEVs for the electromagnetic field. –  Peter Morgan Dec 26 '11 at 16:16

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