TeV scale weak interactions: inclusive vs. exclusive observables

Abstract

Hard processes at the TeV scale exhibit enhanced (double log) EW corrections, that need resummation in view of the high level of precision of Next Linear Colliders. The fact that the weak sector is spontaneously broken causes some peculiarities with respect to unbroken theories like QCD. For observables that are exclusive with respect to $W,Z$ emission, some peculiar technical problems have yet to be solved. Surprisingly, double logarithmic enhancements are present even for inclusive observables like $e^{+}{e}^{-}\to$ hadrons, leading to violation of the Bloch-Nordsieck theorem. The last effect is particularly important, producing weak effects that in some cases compete in magnitude with the strong ones.

7 pages. Talk given at "Les Rencontres de Physique de la Vallee d'Aoste", La Thuile, Aosta Valley; February 27-March 4, 2000