Anomalous Evolution of Nonsinglet Nucleon Structure Functions

Abstract

We calculate the scale dependence of nonsinglet nucleon structure functions. Due to anomalous axial symmetry breaking a large flavour asymmetry of the quark--antiquark sea is generated nonperturbatively. This produces a strong scale dependence of the nonsinglet structure function in an intermediate range of $Q^2$. Evolving nonperturbatively a pure valence distribution from an infrared scale we can thus compute $F_2^p-F_2^n$ as measured by the NMC, and give detailed predictions for its $Q^2$ dependence at fixed $x$. We also compare our results with Drell--Yan data.

13, harvmac 6 figures, CERN-TH.7189/94 and DFTT 02/94

Cited by in corpus (10)

• Transverse Polarisation of Quarks in Hadrons
• Flavor Asymmetry of Antiquark Distributions in the Nucleon
• Flavor Asymmetry of Light Quarks in the Nucleon Sea
• Testing the meson cloud in the nucleon in Drell-Yan processes
• Isospin Mass Splittings of Baryons in Potential Models
• SU(2)-Flavor-Symmetry Breaking in Nuclear Antiquark Distributions
• Pion Content of the Nucleon as seen in the NA51 Drell-Yan experiment
• How to Determine the Pion Cloud of the Constituent Quark
• Anomalous Evolution of Nonsinglet Structure Functions
• ANOMALOUS EVOLUTION EFFECTS ON SINGLET STRUCTURE FUNCTIONS