https://doi.org/10.1140/epjc/s2004-01604-1
theoretical physics
The electroweak form factor 
and the running of 
1
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
* e-mail: andrea.ferroglia@physik.uni-freiburg.de
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
