Radiative muon capture on hydrogen and the induced pseudoscalar coupling constant

M. D. Hasinoff, S. Ahmad, D. S. Armstrong, G. Azuelos, P. Bergbusch, W. Bertl, M. Blecher, C. Q. Chen, P. Depommier, B. C. Doyle, T. Von Egidy, T. P. Gorringe, P. Gumplinger, D. C. Healey, G. Jonkmans, A. J. Larabee, J. A. Macdonald, S. C. McDonald, M. Munro, J. M. PoutissouR. Poutissou, B. C. Robertson, E. Saettler, D. G. Sample, C. Sigler, G. N. Taylor, D. H. Wright, N. S. Zhang

Research output: Contribution to journalArticlepeer-review


The first observation of the elementary process μ-p → νμγ is reported. The muons were stopped in a purified liquid hydrogen target and captured mainly on the ortho on the ortho pμp molecule. The photons were converted to e+e- pairs which were analyzed in a medium-resolution high-acceptance magnetic spectrometer. This reaction is particularly sensitive to the pseudoscalar coupling constant, gp, which was found to be: gp(q2 = -0.88mμ2) = (10.0 ± 0.9 ± 0.3) • ga(0). This value of gp, determined from the photon energy spectrum using a perturbation theory calculation based on tree-level Feynman diagrams, is ∼ 1.5 times the theoretical value, (6.70 ± 0.18) • ga (0).

Original languageEnglish
Pages (from-to)181-188
Number of pages8
JournalHyperfine Interactions
Issue number1-4
StatePublished - Dec 1996

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry


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