QED Vertex Correction

QED Vertex Correction: Working through the Algebra

Pinched Gluon Vertex Operator in Super Worldline Formalism

We reformulate, using super worldline formalism, the pinched gluon vertex operator proposed by Strassler. The pinched vertex operator turns out to be the product of two gluon vertex operators with the insertion of δ-function which makes the super distances between them zero. Thus the pinch procedures turn out to be nothing but the insertions of δ-function. Applying our formulation to two-loop d...

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...

Coherent states in null-plane QED.

Light front field theories are known to have the usual infra-red divergences of the equal time theories, as well as new ‘spurious’ infra-red divergences. The former kind of IR divergences are usually treated by giving a small mass to the gauge particle. An alternative method to deal with these divergences is to calculate the transition matrix elements in a coherent state basis. In this paper we...

QED radiative corrections to parity nonconservation in heavy atoms.

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 relatio...