Quark Asymmetries in Nucleons

Journal Article · Thu Oct 06 04:00:00 EDT 2005 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2122050· OSTI ID:20726451

Alwall, Johan ^[1]

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1. High Energy Physics, Uppsala University, Box 535, S-75121 Uppsala (Sweden)

We have developed a physical model for the non-perturbative x-shape of parton density functions in the proton, based on Gaussian fluctuations in momenta, and quantum fluctuations of the proton into meson-baryon pairs. 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. We also find an asymmetry in the momentum distribution of strange and anti-strange quarks in the nucleon, large enough to reduce the NuTeV anomaly to a level which does not give a significant indication of physics beyond the standard model.

• OSTI ID: 20726451
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 792; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
DENSITY
DISTRIBUTION
FLUCTUATIONS
MESON-BARYON INTERACTIONS
MESONS
NEUTRINOS
PROTONS
QUARK MODEL
S QUARKS
STANDARD MODEL
STRUCTURE FUNCTIONS
SYMMETRY
VALENCE