Ortho-para transition rate in μ-molecular hydrogen and the proton's induced pseudoscalar coupling gₚ
Clark, J. H. D. · Armstrong, D. S. · Gorringe, T. P. · Hasinoff, M. D. · King, P. M. · Stocki, T. J. · Tripathi, S. · Wright, D. H. · Zolnierczuk, P. A.
Original · EN
We report a measurement of the ortho-para transition rate in the pμp molecule. The experiment was conducted at TRIUMF via the measurement of the time dependence of the 5.2 MeV neutrons from muon capture in liquid hydrogen. The measurement yielded an ortho-para rate Λop = (11.1 ± 1.7 ±⁰.⁹₀.₆) × 10⁴ s⁻¹ that is substantially larger than the earlier result of Bardin et al. We discuss the striking implications for the proton's induced pseudoscalar coupling gₚ.
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