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Effect of two-boson exchange on parity-violating e-p scattering
1Physics Department, University of Utrecht, The Netherlands.
Physical Review Letters
|March 21, 2008
Summary
This study calculates corrections for parity-violating electron-proton scattering experiments. These corrections are crucial for accurately determining the proton
Area of Science:
- Nuclear Physics
- Particle Physics
- Quantum Chromodynamics
Background:
- Parity-violating elastic electron-proton scattering is a key method for probing the proton's strange form factors.
- Previous calculations faced discrepancies in the proton's electric to magnetic form factor ratio.
- Accurate theoretical calculations are needed to interpret experimental results, especially concerning the weak sector.
Purpose of the Study:
- To compute two-photon and gamma-Z exchange corrections in parity-violating electron-proton scattering.
- To extend a successful hadronic formalism to the electroweak sector for improved accuracy.
- To provide essential corrections for ongoing and future parity-violating experiments.
Main Methods:
- Utilized a hadronic formalism previously validated for reconciling discrepancies in electron scattering.
- Extended the formalism to incorporate electroweak interactions, including two-photon and gamma-Z exchange.
- Implemented realistic electroweak form factors for the proton.
Main Results:
- Calculated corrections of 2%-3% at Q(2) ~ 0.1 GeV(2).
- Observed that these corrections are largest at backward scattering angles and show strong Q(2) dependence at low momentum transfer.
- Found enhanced two-boson contributions to the weak axial current at low Q(2) and forward angles.
Conclusions:
- The computed corrections are significant for precise extractions of the proton's strange form factors.
- The extended hadronic formalism provides a robust framework for analyzing parity-violating scattering data.
- These findings offer crucial theoretical support for interpreting data from current and upcoming experiments.
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