Radiative Corrections to Parity Nonconserving Transitions in Atoms
نویسندگان
چکیده
Abstract The matrix element of a bound electron interacting with the nucleus through exchange of a Z boson is studied for the gauge invariant case of 2s1/2 − 2p1/2 transitions in hydrogenic ions. The QED radiative correction to the matrix element, which is −α/2π in lowest order, is calculated to all orders in Zα using exact propagators. Previous calculations of the first-order binding correction are confirmed both analytically and by fitting the exact function at low Z. Consequences for the interpretation of parity nonconservation in cesium are discussed.
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ar X iv : h ep - p h / 02 06 12 4 v 1 1 4 Ju n 20 02 QED radiative corrections to parity nonconservation in heavy atoms
The self-energy and vertex QED radiative corrections (∼ Zα 2 f (Zα)) are shown to give a large negative contribution to the parity nonconserving (PNC) amplitude in heavy atoms. The correction −0.7(2)% found for the 6s − 7s PNC amplitude in 133 Cs brings the experimental result for this transition into agreement with the standard model. The calculations are based on a new identity that expresses...
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