Evidence for Charge Symmetry Violation in Parton Distributions

Abstract

By comparing structure functions measured in neutrino and charged lepton deep inelastic scattering, one can test the validity of parton charge symmetry. New experiments allow us to make such tests, which set rather tight upper limits on parton charge symmetry violation [CSV] for intermediate Bjorken $x$, but which appear to show sizable CSV effects at small $x$. We show that neither nuclear shadowing nor contributions from strange and antistrange quark distributions can account for the experimentally observed difference between the two structure functions. We are therefore forced to consider the possibility of a large CSV effect in the nucleon sea quark distributions. We discuss the consequences of this effect for other observables, and we propose an experiment which could detect a large CSV component in the nucleon sea.

32 pages, 10 figures

References in corpus (7)

• Measurement of the Light Antiquark Flavor Asymmetry in the Nucleon Sea
• An Improved Determination of ${\alpha }_S$ From Neutrino-Nucleon Scattering
• Evidence for Substantial Charge Symmetry Violation in Parton Distributions
• Detailed Next-to-Leading Order Analysis of Deep Inelastic Neutrino Induced Charm Production off Strange Sea Partons
• Shadowing in neutrino deep inelastic scattering and the determination of the strange quark distribution
• Flavor and Charge Symmetry in the Parton Distributions of the Nucleon
• Testing Parton Charge Symmetry at HERA

Cited by in corpus (13)

• Improved Measurement of the $\bar{d}/\bar{u}$ Asymmetry in the Nucleon Sea
• Open-source QCD analysis of nuclear parton distribution functions at NLO and NNLO
• Charge Symmetry at the Partonic Level
• Contribution of asymmetric strange-antistrange sea to the Paschos-Wolfenstein relation
• A New Analysis of Charge Symmetry Violation in Parton Distributions
• Charge symmetry violation in the parton distributions of the nucleon
• The Potential for Neutrino Physics at Muon Colliders and Dedicated High Current Muon Storage Rings
• Predictions for Neutrino Structure Functions
• Physics of the Nucleon Sea Quark Distributions
• Nuclear shadowing at low Q^2
• QCD Precision Measurements and Structure Function Extraction at a High Statistics, High Energy Neutrino Scattering Experiment: NuSOnG
• Parton Charge Symmetry Violation: Electromagnetic Effects and W Production Asymmetries
• Impact of Charge Symmetry Breaking on Gluon and Sea Quark Distributions in the Pion and Kaon