Abstract

The ortho-para transition rate in the pμp molecule has been found experimentally to be λ OP = (4.1 ± 1.4) × 10 4 s −1. Our recent result for the muon capture rate in liquid hydrogen can now be interpreted to extract the ortho-molecular capture rate: λ OM = (531 ± 33) s −1. A deduction of the pseudoscalar coupling constant g p μ is presented: we find g p μ = 8.7 ± 1.9.

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