Physics – High Energy Physics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005iche.conf..584m&link_type=abstract
HIGH ENERGY PHYSICS, ICHEP 2004. Proceedings of the 32nd International Conference. Held 16-22 August 2004 in Beijing, China. Edi
Physics
High Energy Physics
Scientific paper
The Adler sum rule for deep inelastic neutrino scattering measures the isospin of the nucleon, and is hence exact. In contrast the Gottfried sum rule for charged lepton scattering does receive perturbative and non-perturbative corrections. We show that at two-loop level the Gottfried sum rule is suppressed by a factor 1/Nc2 relative to higher moments, and we conjecture that this suppression holds to all-orders, and also for higher-twist effects. It is further noted that the differences between radiative corrections for higher moments of neutrino and charged lepton deep inelastic scattering, are 1/Nc2 suppressed at two-loops, and this is also conjectured to hold to all-orders. The 1/Nc2 suppression of perturbative corrections to the Gottfried sum rule makes it plausible that the deviations from the parton model value are dominated by a light quark flavour asymmetry in the nucleon sea. This asymmetry indeed persists as Nc → ∞ as predicted in a chiral-soliton model.
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