The electroweak form factor and the running of
Fakultät für Physik, Universität Freiburg, 79104, Freiburg, Germany
2 Institut für Theoretische Teilchenphysik, Universität Karlsruhe, 76128, Karlsruhe, Germany
3 Department of Physics, New York University, 4 Washington Place, NY 10003, New York, USA
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Gauge independent form factors and for Møller scattering at are derived. It is pointed out that is very different from its counterparts in other processes. The relation between the effective parameter and is derived in a scale-independent manner. A gauge- and process-independent running parameter , based on the pinch-technique self-energy , is discussed for all q 2 values. At q 2 = 0 it absorbs very accurately the Czarnecki-Marciano calculation of the Møller scattering asymmetry at low s values, and at q 2 = m Z 2 it is rather close to . The q 2 dependence of is displayed in the space- and time-like domains.
© Springer-Verlag, 2004