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  Is there precision experimental evidence for Furry's theorem -- that only even degree VEVs are non-zero?

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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?

This post has been migrated from (A51.SE)
asked Dec 23, 2011 in Theoretical Physics by Peter Morgan (1,200 points) [ no revision ]
retagged Apr 19, 2014 by dimension10
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).

This post has been migrated from (A51.SE)
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.

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