出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We study the asymptotic behaviour of two-loop electroweak corrections at energies Q2 ≫ M2W
,
where logarithms of the type ln(Q2/M2W
) become dominant. The calculation of the leading and
next-to-leading logarithmic terms for massless and massive fermion-scattering processes is summarized.
The derivations are performed diagrammatically within the spontaneously broken electroweak
theory. We find that the soft and collinear singularities resulting from photons can be
factorized into a QED-like term and that, up to logarithms of the Z–W mass ratio, the effects of
symmetry breaking cancel. This result supports resummation prescriptions that are based on a
symmetric SU(2)×U(1) theory matched with QED at the electroweak scale.
