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QED radiative corrections to parity nonconservation in heavy atoms
1School of Physics, University of New South Wales, Sydney 2052, Australia. kuchiev@newt.phys.unsw.edu.au
Physical Review Letters
|January 7, 2003
Abstract:
The self-energy and vertex QED radiative corrections [approximately Zalpha2f(Zalpha)] are shown to give a large negative contribution to the parity nonconserving (PNC) amplitude in heavy atoms. The correction -0.73(20)% found for the 6s-7s PNC amplitude in 133Cs brings the experimental result for this transition into agreement with the standard model. The calculations are based on a new relation that expresses the radiative corrections to the PNC matrix element via corrections to the energy shifts induced by the finite nuclear size.