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Related Experiment Videos

Constraints on proton structure from precision atomic-physics measurements.

Stanley J Brodsky1, Carl E Carlson, John R Hiller

  • 1Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309, USA.

Physical Review Letters
|February 9, 2005
PubMed
Summary

The Zemach radius, a key proton structure measure, is precisely determined using atomic physics data from hydrogen and muonium. This finding offers crucial constraints for proton form factor measurements from accelerator experiments.

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Area of Science:

  • Atomic Physics
  • Quantum Electrodynamics (QED)
  • Particle Physics

Background:

  • Ground-state hyperfine splittings in hydrogen and muonium are precisely measured.
  • The difference in these splittings, after corrections, is sensitive to proton structure.

Purpose of the Study:

  • To determine the Zemach radius, a fundamental measure of proton structure, using atomic physics data.
  • To constrain accelerator-based measurements of proton form factors.
  • To experimentally extract QED corrections to hydrogenic hyperfine data using muonium.

Main Methods:

  • Analysis of ground-state hyperfine splittings in hydrogen and muonium.
  • Correction for magnetic moment and reduced mass effects.
  • Calculation of the Zemach radius from an integral of proton electric and magnetic form factors.

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Main Results:

  • The Zemach radius was determined to be (1.019 ± 0.016) fm.
  • This atomic physics determination provides tight constraints on fits to proton form factor data from accelerators.
  • A significant discrepancy was observed between measured and theoretical QED corrections for hydrogenic hyperfine data, mirroring a positronium anomaly.

Conclusions:

  • Atomic physics measurements provide a precise determination of the Zemach radius, a fundamental proton property.
  • The results highlight the interplay between atomic physics, QED, and proton structure.
  • The observed QED discrepancy warrants further theoretical and experimental investigation.