Ortho-para transition rate in $μ$-molecular hydrogen and the proton's induced pseudoscalar coupling $g_p$

Details Ortho-para transition rate in $μ$-molecular hydrogen and the proton's induced pseudoscalar coupling $g_p$ Ortho-para transition rate in $μ$-molecular hydrogen and the proton's induced pseudoscalar coupling $g_p$

2005-09-19

arxiv.org/abs/nucl-ex/0509025v1

Phys.Rev.Lett. 96 (2006) 073401

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 3 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.96.073401

We report a measurement of the ortho-para transition rate in the p$\mu$p 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 $\Lambda_{op} = (11.1 \pm 1.7 \pm^{0.9}_{0.6}) \times 10^4$ s$^{-1}$ that is substantially larger than the earlier result of Bardin {\it et al.} We discuss the striking implications for the proton's induced pseudoscalar coupling $g_p$.

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