Eur. Phys. J. C 70, 659-671 (2010)
https://doi.org/10.1140/epjc/s10052-010-1489-x

Electroweak Sudakov logarithms and real gauge-boson radiation in the TeV region

¹ Institut für Theoretische Teilchenphysik, Universität Karlsruhe, 76128, Karlsruhe, Germany
² Institute for Theoretical Physics, University of Bern, 3012, Bern, Switzerland

bell@itp.unibe.ch

Received: 1 June 2010
Revised: 28 September 2010
Published online: 13 November 2010

Abstract

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.