The electric charge at the two-loop level in the Standard Model and the precision measurements of Delta alpha_{had}

Details The electric charge at the two-loop level in the Standard Model and the precision measurements of Delta alpha_{had} The electric charge at the two-loop level in the Standard Model and the precision measurements of Delta alpha_{had}

2003-12-11

arxiv.org/abs/hep-ph/0312148v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at the workshop SIGHAD03, Pisa, 8-10 October 2003, two references added

Scientific paper

10.1016/S0920-5632(04)00018-0

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 $\hat e(m_Z)$. 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.

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