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29 March 2024
 
  » arxiv » nucl-ex/9608005

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Radiative Muon Capture on Hydrogen and the Induced Pseudoscalar Coupling
G. Jonkmans ; S. Ahmad ; D.S. Armstrong ; G. Azuelos ; W. Bertl ; M. Blecher ; C.Q. Chen ; P. Depommier ; B.C. Doyle ; T. von Egidy ; T.P. Gorringe ; P. Gumplinger ; M.D. Hasinoff ; D. Healey ; A.J. Larabee ; J.A. Macdonald ; S.C. McDonald ; M. Munro ; J.-M. Poutissou ; R. Poutissou ; B.C. Robertson ; D.G. Sample ; E. Saettler ; C.M. Sigler ; G.N. Taylor ; D.H. Wright ; N.S. Zhang ;
Date 22 Aug 1996
Journal Phys.Rev.Lett. 77 (1996) 4512-4515
Subject nucl-ex hep-ex
AbstractThe first measurement of the elementary process $mu^- p ightarrow u_{mu} n gamma$ is reported. A photon pair spectrometer was used to measure the partial branching ratio ($2.10 pm 0.22) imes 10^{-8}$ for photons of k > 60 MeV. The value of the weak pseudoscalar coupling constant determined from the partial branching ratio is $g_p(q^{2}=-0.88m_{mu}^2) = (9.8 pm 0.7 pm 0.3) cdot g_a(0)$, where the first error is the quadrature sum of statistical and systematic uncertainties and the second error is due to the uncertainty in $lambda_{op}$, the decay rate of the ortho to para $p mu p$ molecule. This value of g_p is $sim$1.5 times the prediction of PCAC and pion-pole dominance.
Source arXiv, nucl-ex/9608005
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