MEASUREMENT OF THE RUNNING OF EFFECTIVE QED COUPLING AT LARGE MOMENTUM TRANSFER IN THE SPACELIKE REGION
1998
resonance [3]have enabled an evaluation in the off-resonance region.Theoretically, the VP effect can be estimated by addingthe contributions of all possible virtual states (loops) thatcan be embedded in the photon propagator mediatingcharged-particle interactions. While the contribution ofleptonic loops can be reliably estimated from perturbativecalculations, hadronic contributions are usually estimatedwith a dispersion integral based on the experimental dataconcerning the reaction
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