6533b7d2fe1ef96bd125e2e1
RESEARCH PRODUCT
Collinear splitting, parton evolution and the strange-quark asymmetry of the nucleon in NNLO QCD
Werner VogelsangDaniel De FlorianStefano CataniGerman Rodrigosubject
QuarkNuclear and High Energy PhysicsParticle physicsStrange quarkSTRANGEmedia_common.quotation_subjectHigh Energy Physics::LatticeCiencias FísicasFOS: Physical sciencesPartonSpace (mathematics)SPLITTINGAsymmetryCOLLINEARHigh Energy Physics - Phenomenology (hep-ph)FactorizationNuclear Experimentmedia_commonPhysicsQuantum chromodynamicsHigh Energy Physics::PhenomenologyFísicaAtomic and Molecular Physics and OpticsAstronomíaHigh Energy Physics - PhenomenologyHigh Energy Physics::ExperimentNucleonCIENCIAS NATURALES Y EXACTASdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2004-06-30 |