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Proton spin structure in the resonance region.

F R Wesselmann1, K Slifer, S Tajima

  • 1University of Virginia, Charlottesville, VA 22903, USA.

Physical Review Letters
|May 16, 2007
PubMed

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Summary
This summary is machine-generated.

We measured proton spin asymmetries using a polarized electron beam. Results show a nonzero A(perpendicular) and significant higher-twist effects, challenging quark-hadron duality.

Area of Science:

  • Nuclear Physics
  • Particle Physics
  • Quantum Chromodynamics

Background:

  • Understanding the proton's spin structure is crucial in particle physics.
  • Nucleon resonances provide a unique window into the proton's internal dynamics.

Purpose of the Study:

  • To precisely measure proton spin asymmetries in the nucleon resonance region.
  • To extract spin structure functions g1 and g2.
  • To investigate higher-twist effects and polarized quark-hadron duality.

Main Methods:

  • Utilized Jefferson Lab's polarized electron beam and a polarized solid target.
  • Employed a spectrometer to measure asymmetries A|| and A(perpendicular).
  • High-precision measurements were performed at Q²=1.3 GeV².

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Main Results:

  • A notably nonzero A(perpendicular) asymmetry was observed.
  • Significant contributions from higher-twist effects were identified.
  • Weak support for polarized quark-hadron duality was found.

Conclusions:

  • The proton spin structure exhibits complex behavior in the resonance region.
  • Higher-twist effects play a substantial role, impacting theoretical models.
  • Further research is needed to fully understand spin structure and duality.