The electric charge at the two-loop level in the Standard Model and the precision measurements of Delta alpha_{had}
arXiv:hep-ph/0312148 · doi:10.1016/S0920-5632(04)00018-0
Abstract
The complete calculation of the 2-loop electroweak corrections to the renormalization of the electric charge in the Standard Model allows to discuss in detail the value of the MSbar effective coupling . We discuss the phenomenological impact of these results in view of the increasing accuracy in the measurements of the cross-section of the reaction e+e- -->hadrons at low energies.
arXiv commentTalk given at the workshop SIGHAD03, Pisa, 8-10 October 2003, two references added