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Nov 19, 2018 at 0:18 comment added Bob Jacobsen Not so much the W and Z mass as that their couplings with e+ and e- depend on $cos \theta$. The (small) weak force on e+ varies from one spin pole to the other (a little), with the effect on the e- in the cloud having the opposite dependency.
Nov 18, 2018 at 18:51 comment added David Tonhofer That makes the electron a bit “pear shaped”, with it’s net charge a tiny bit displaced from the center of mass. Why the asymetry? Does it have anything to do with the different masses of the W and Z?
Nov 18, 2018 at 16:41 history answered Bob Jacobsen CC BY-SA 4.0