Collinear splitting, parton evolution and the strange-quark asymmety of the nucleon in NNLO QCD
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Collinear splitting, parton evolution and the strange-quark asymmety of the nucleon in NNLO QCD

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Collinear splitting, parton evolution and the strange-quark asymmety of the nucleon in NNLO QCD

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Rodrigo García, Germán Vicente; Catani, Stefano; de Florian, Daniel; Vogelsang, Werner
Aquest document és un/a article, creat/da en: 2004
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)−s¯(x) in the nucleon's sea.

    Rodrigo García, Germán Vicente Catani, Stefano de Florian, Daniel Vogelsang, Werner 2004 Collinear splitting, parton evolution and the strange-quark asymmety of the nucleon in NNLO QCD Nuclear Physics B-Proceedings Supplements 135 188 192
http://dx.doi.org/10.1016/j.nuclphysbps.2004.09.048
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