Electroweak Sudakov logarithms and real gauge-boson radiation in the TeV region
Institut für Theoretische Teilchenphysik, Universität Karlsruhe, 76128, Karlsruhe, Germany
2 Institute for Theoretical Physics, University of Bern, 3012, Bern, Switzerland
Revised: 28 September 2010
Published online: 13 November 2010
Electroweak radiative corrections give rise to large negative, double-logarithmically enhanced corrections in the TeV region. These are partly compensated by real radiation and, moreover, affected by selecting isospin-non-invariant external states. We investigate the impact of real gauge boson radiation more quantitatively by considering different restricted final state configurations. We consider successively a massive abelian gauge theory, a spontaneously broken SU(2) theory and the electroweak Standard Model. We find that details of the choice of the phase space cuts, in particular whether a fraction of collinear and soft radiation is included, have a strong impact on the relative amount of real and virtual corrections.
© Springer-Verlag / Società Italiana di Fisica, 2010