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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
This summary is machine-generated.

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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.

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.

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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.