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Quark-hadron duality in neutron (3He) spin structure.
P Solvignon1, N Liyanage, J-P Chen
1Argonne National Laboratory, Argonne, Illinois 60439, USA.
This study tested quark-hadron duality in neutron and Helium-3 spin structure functions. Results show duality holds at high momentum transfer, crucial for understanding nucleon spin.
Area of Science:
- Nuclear Physics
- Particle Physics
- Quantum Chromodynamics
Background:
- Quark-hadron duality is a key concept linking the partonic and hadronic descriptions of Quantum Chromodynamics.
- Understanding the spin-structure function g1 is essential for probing the spin structure of nucleons.
Purpose of the Study:
- To perform the first high-precision test of quark-hadron duality in the neutron and Helium-3 spin-structure function g1.
- To investigate the validity of global duality at various momentum transfer scales.
Main Methods:
- Utilized a polarized Helium-3 target for experiments.
- Measured the spin-structure function g1 across a four-momentum-transfer-squared (Q^2) range of 0.7 to 4.0 (GeV/c)^2.
- Analyzed the photon-nucleon asymmetry A1 in the resonance region.
Main Results:
- Observed global duality for the spin-structure function g1 down to Q^2 = 1.8 (GeV/c)^2 for both neutron and Helium-3.
- Found no significant Q^2 dependence for the photon-nucleon asymmetry A1 above 2.2 (GeV/c)^2 in Helium-3.
Conclusions:
- Quark-hadron duality is experimentally confirmed at high precision in the studied kinematic regime.
- The findings provide crucial data for refining theoretical models of nucleon spin structure.
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