Enhanced electroweak corrections to inclusive boson fusion processes at the TeV scale

Electroweak radiative corrections with double-log enhancements occur in inc lusive observables at the TeV scale because of a lack of compensation of vi rtual corrections with real emission due to the non-abelian (weak isospin) charges of the accelerator beams. Here we evaluate such Bloch-Nordsieck vio lating corrections in the case of initial longitudinal bosons, which is exp erimentally provided by boson fusion processes, and is related to the Golds tone-Higgs sector. All four states of this sector are involved in the group structure of the corrections, and cause in particular a novel double log e ffect due to hypercharge mixing in the longitudinal states. We study both t he light- and the heavy-Higgs cases, and we analyze the symmetry breaking p attern of the corrections. The latter turn out to be pretty large, in the 5 -10% range, and show an interesting Higgs mass dependence, even or processe s without Higgs boson in the final state. (C) 2001 Published by Elsevier Sc ience B.V.