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Related Experiment Video

Updated: Jul 13, 2026

Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

Electroweak radiative corrections to muon capture.

Andrzej Czarnecki1, William J Marciano, Alberto Sirlin

  • 1Department of Physics, University of Alberta Edmonton, AB T6G 2J1, Canada.

Physical Review Letters
|August 7, 2007
PubMed
Summary

Electroweak radiative corrections significantly increase muon capture rates in hydrogen and helium. This finding resolves discrepancies between experimental and theoretical values for the induced pseudoscalar coupling.

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Area of Science:

  • Nuclear physics
  • Particle physics
  • Quantum chromodynamics

Background:

  • Muon capture is a fundamental process in particle and nuclear physics.
  • Previous calculations of electroweak radiative corrections were incomplete.
  • Experimental data for muon capture on hydrogen and helium exist.

Purpose of the Study:

  • To compute electroweak radiative corrections to muon capture on nuclei.
  • To reassess the induced pseudoscalar coupling from experimental data.
  • To compare experimental results with theoretical predictions from chiral perturbation theory.

Main Methods:

  • Calculation of electroweak radiative corrections.
  • Analysis of muon capture rates for hydrogen and helium.
  • Extraction of the induced pseudoscalar coupling from experimental data.

Main Results:

  • Electroweak radiative corrections were found to be sizable, enhancing capture rates by 2.8% for hydrogen and 3.0% for helium.
  • The experimental value of the induced pseudoscalar coupling was increased by 21% to 7.3+/-1.2.
  • This revised experimental value now agrees well with the chiral perturbation theory prediction of 8.2+/-0.2.

Conclusions:

  • Electroweak radiative corrections are crucial for accurate muon capture rate predictions.
  • The agreement between experiment and theory for the induced pseudoscalar coupling is significantly improved.
  • Further implications for helium capture rate predictions are discussed.