Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-06-30
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, 3 figures. Presented at Loops and Legs in Quantum Field Theory, April 25 -30, 2004. Zinnowitz, Germany
Scientific paper
10.1016/j.nuclphysbps.2004.09.04
We consider the collinear limit of QCD amplitudes at one-loop order, and their factorization properties directly in colour space. These results apply to the multiple collinear limit of an arbitrary number of QCD partons, and are a basic ingredient in many higher-order computations. In particular, we discuss the triple collinear limit and its relation to flavour asymmetries in the QCD evolution of parton densities at three loops. As a phenomenological consequence of this new effect, and of the fact that the nucleon has non-vanishing quark valence densities, we study the perturbative generation of a strange--antistrange asymmetry $s(x)-\bar{s}(x)$ in the nucleon's sea.
Catani Stefano
de Florian Daniel
Rodrigo German
Vogelsang Werner
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