Ortho-Para Transition Rate in {mu}-Molecular Hydrogen and the Proton's Induced Pseudoscalar Coupling g{sub p}
- College of William and Mary, Williamsburg, Virginia 23187 (United States)
- University of Kentucky, Lexington, Kentucky 40506 (United States)
- University of British Columbia, Vancouver, British Columbia, V6T 1Z1 (Canada)
- TRIUMF, Vancouver, British Columbia, V6T 2A3 (Canada)
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}{sub op}=(11.1{+-}1.7{+-}(0.9/0.6))x10{sup 4} s{sup -1}, which is substantially larger than the earlier result of Bardin et al. The result has striking implications for the proton's induced pseudoscalar coupling g{sub p}, changing the value of g{sub p} obtained from the most precise ordinary muon capture measurement from 10.6{+-}2.7 to 0.8{+-}2.8, and from the sole radiative muon capture measurement from 12.2{+-}1.1 to 10.6{+-}1.2, bringing the latter result closer to theoretical predictions.
- OSTI ID:
- 20778653
- Journal Information:
- Physical Review Letters, Vol. 96, Issue 7; Other Information: DOI: 10.1103/PhysRevLett.96.073401; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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