Quark asymmetries in the proton from a model for parton densities

Journal Article · Sun May 01 04:00:00 EDT 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.71.094015· OSTI ID:20709374

Alwall, J; Ingelman, G ^[1]

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

Based on quantum fluctuations in momentum and of the proton into meson-baryon pairs, we develop a physical model for the nonperturbative 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 antistrange 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.

• OSTI ID: 20709374
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 71; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
DENSITY
DISTRIBUTION
FLUCTUATIONS
MESONS
PARTON MODEL
PARTONS
PROTONS
QUANTUM CHROMODYNAMICS
QUARKS
STANDARD MODEL
STRUCTURE FUNCTIONS