Measurement of the induced pseudoscalar coupling using radiative muon capture on hydrogen
1998
18 pages
Published in:
- Phys.Rev.C 57 (1998) 373-390
Citations per year
Abstract: (APS)
The photon energy spectrum from the elementary process μ−p→νμnγ was measured using a photon pair-spectrometer at the TRIUMF cyclotron. Various sources of backgrounds are discussed in detail and evaluated. From the final spectrum the partial branching ratio Rγ and the pseudoscalar coupling gp were extracted. The values obtained are Rγ(k>60 MeV)=(2.10±0.21)×10−8 and gp(q2=−0.88mμ2)=(9.8±0.7±0.3)ga(0), respectively. The first error is the quadrature sum of statistical and systematic errors, while the second error is due to the uncertainty in λop, the transition rate of the pμp molecule from ortho to para states. This measurement of gp, the most precise to date, agrees with all but one of the previous measurements. However it is 1.46 times the value predicted by the partially conserved axial current hypothesis and pion pole dominance.- muon p: radiative capture
- coupling constant: pseudoscalar
- photon: energy spectrum
- magnetic spectrometer: experimental results
- TRIUMF Cycl
- muon- p --> n neutrino/mu photon
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