Radiative muon capture on hydrogen and the induced pseudoscalar coupling constant

Academic Article


  • 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). © J.C. Baltzer AG, Science Publishers.
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    Author List

  • Hasinoff MD; Ahmad S; Armstrong DS; Azuelos G; Bergbusch P; Bertl W; Blecher M; Chen CQ; Depommier P; Doyle BC
  • Start Page

  • 181
  • End Page

  • 188
  • Volume

  • 103
  • Issue

  • 1-4