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

TL;DR

This paper extends the calculation of two-loop electroweak NLL corrections from massless to massive external fermions, providing new insights and preliminary results for massive fermion form factors.

Contribution

It introduces the extension of two-loop electroweak NLL corrections to processes with massive external fermions, building on previous massless results.

Findings

Universal correction factors depending on quantum numbers

Extension of NLL corrections to massive fermions

Preliminary Abelian form factor for massive fermions

Abstract

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.