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Quark Asymmetries in the Proton from a Model for Parton Densities
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik. (Teoretisk högenergifysik)
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics, High Energy Physics. Högenergifysik. (Teoretisk högenergifysik)
2005 (English)In: Physical Review D, Vol. 71, no 094015Article in journal (Refereed) Published
Abstract [en]

Based on quantum fluctuations in momentum and of the proton into meson-baryon pairs, we develop a physical model for the non-perturbative x-shape of parton density functions in the proton. The model describes the proton structure function and gives a natural explanation of observed quark asymmetries, such as the difference between the anti-up and anti-down sea quark distributions and between the up and down valence distributions. An asymmetry in the momentum distribution of strange and anti-strange quarks in the nucleon is found to reduce the NuTeV anomaly to a level which does not give a significant indication of physics beyond the standard model.

Place, publisher, year, edition, pages
2005. Vol. 71, no 094015
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URN: urn:nbn:se:uu:diva-77162DOI: doi:10.1103/PhysRevD.71.094015OAI: oai:DiVA.org:uu-77162DiVA: diva2:105074
Available from: 2006-03-13 Created: 2006-03-13 Last updated: 2011-01-11

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Alwall, JohanIngelman, Gunnar

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