A reappraisal of atomic parity non-conservation

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Abstract
Atomic parity nonconservation (APNC) is re-expressed in terms of the mass of the Z boson Mz. It is shown that the particular ratio of neutron to proton number in heavy atoms has the very advantageous feature that the product APNCM2Z is essentially independent of the Weinberg angle. The author predicts values for the product of -2.383 in the absence of radiative corrections and -2.502 when they are included. These are to be compared with an experimental value of -2.456 (52) where the first error is from the atomic experiment and the second from the intervening atomic theory. The author also notes that the product is free from uncertainty in the mass of the top quark so that any deviation between theory and experiment would imply physics beyond the standard model.