Towards collinear evolution equations in electroweak theory.
We investigate collinear factorization in electroweak radiative corrections to hard inclusive processes at the TeV scale. Because of the uncanceled double logs found previously, we find a factorization pattern which is qualitatively different from the analogous one in QCD. New types of splitting functions emerge which are needed to describe the initial beam charges and are dependent on an infrared cutoff provided by the symmetry breaking scale. We derive such splitting functions at the one-loop level for broken SU(2) gauge theory, and we also discuss the structure functions' evolution equations, under the assumption that isospin breaking terms are sufficiently subleading at higher orders.
Ciafaloni
Marcello
M
Dipartimento di Fisica, Università di Firenze and INFN-Sezione di Firenze, via Sansone 1, I-50019 Sesto Fiorentino, Firenze, Italy.
Ciafaloni
Paolo
P
Comelli
Denis
D