Two-Loop Electroweak NLL Corrections: from Massless to Massive Fermions

Details Two-Loop Electroweak NLL Corrections: from Massless to Massive Fermions Two-Loop Electroweak NLL Corrections: from Massless to Massive Fermions

2007-09-14

arxiv.org/abs/0709.2311v1

ECONF C0705302:LOOP02,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, proceedings for the LCWS/ILC 2007 workshop at DESY, Hamburg, Germany

Scientific paper

Recently the two-loop next-to-leading logarithmic (NLL) virtual corrections to arbitrary processes with massless external fermions have been calculated. Within the spontaneously broken electroweak theory the one- and two-loop mass singularities have been derived to NLL accuracy and expressed as universal correction factors depending only on the quantum numbers of the external particles. This talk summarizes the results for massless fermionic processes and presents new aspects arising in the extension of the corresponding loop calculations to massive external fermions. As a preliminary result, the Abelian form factor for massive fermions is given.

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