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Updated: Jul 13, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 16, 2013
Parity-violating electron deuteron scattering and the proton's neutral weak axial vector form factor
T M Ito1, T Averett, D Barkhuff
1W. K. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125, USA. tito@krl.caltech.edu
Researchers measured parity-violating asymmetry in electron scattering from deuterons. The results confirm theoretical predictions for the neutral weak axial vector form factor, crucial for understanding nucleon structure.
Area of Science:
- Nuclear Physics
- Particle Physics
- Electroweak Interactions
Background:
- The neutral weak axial vector form factor of the nucleon is a key parameter in understanding fundamental interactions.
- Electroweak corrections can significantly influence this form factor, necessitating precise experimental measurements.
- Parity-violating asymmetries in electron scattering offer a sensitive probe of these properties.
Purpose of the Study:
- To report a new measurement of the parity-violating asymmetry in quasielastic electron scattering from the deuteron.
- To determine the neutral weak axial vector form factor of the nucleon at a specific momentum transfer (Q2).
- To compare experimental results with theoretical predictions, including potential electroweak corrections.
Main Methods:
- Performed quasielastic electron scattering experiments on a deuteron target at backward angles.
- Measured the parity-violating asymmetry (A) at Q2=0.038 (GeV/c)2.
- Utilized updated results from a previous experiment at Q2=0.091 (GeV/c)2 for comparison.
Main Results:
- The measured asymmetry at Q2=0.038 (GeV/c)2 is A = -3.51 ± 0.57 (stat) ± 0.58 (syst) ppm.
- Updated results from the Q2=0.091 (GeV/c)2 experiment were also reported.
- Both sets of results are consistent with current theoretical predictions.
Conclusions:
- The new measurement provides a precise determination of the neutral weak axial vector form factor.
- The consistency with theoretical predictions validates current models of electroweak interactions in nucleons.
- This study contributes to a deeper understanding of the fundamental structure of matter.
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