Related Experiment Video
Updated: Jul 23, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Evidence for quark-hadron duality in the proton spin asymmetry A1
A Airapetian1, N Akopov, Z Akopov
1Yerevan Physics Institute, 375036, Yerevan, Armenia.
Abstract:
Spin-dependent lepton-nucleon scattering data have been used to investigate the validity of the concept of quark-hadron duality for the spin asymmetry A1. Longitudinally polarized positrons were scattered off a longitudinally polarized hydrogen target for values of Q2 between 1.2 and 12 GeV2 and values of W2 between 1 and 4 GeV2. The average double-spin asymmetry in the nucleon resonance region is found to agree with that measured in deep-inelastic scattering at the same values of the Bjorken scaling variable x. This finding implies that the description of A1 in terms of quark degrees of freedom is valid also in the nucleon resonance region for values of Q2 above 1.6 GeV2.
More Related Videos
Related Concept Videos
The Pauli Exclusion Principle
Atomic Nuclei: Nuclear Spin
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not contribute to...
Atomic Nuclei: Nuclear Magnetic Moment
Atomic Nuclei: Nuclear Spin State Overview
¹H NMR Signal Multiplicity: Splitting Patterns
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

