Measurement of muon capture on the proton to 1% precision and determination of the pseudoscalar coupling gP
(2013) Physical Review Letters — Vol. 110, n° 1 (2013)
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- Abstract
- The MuCap experiment at the Paul Scherrer Institute has measured the rate Λ<inf>S</inf> of muon capture from the singlet state of the muonic hydrogen atom to a precision of 1%. A muon beam was stopped in a time projection chamber filled with 10-bar, ultrapure hydrogen gas. Cylindrical wire chambers and a segmented scintillator barrel detected electrons from muon decay. Λ<inf>S</inf> is determined from the difference between the μ<sup>-</sup> disappearance rate in hydrogen and the free muon decay rate. The result is based on the analysis of 1.2×1010 μ<sup>-</sup> decays, from which we extract the capture rate Λ<inf>S</inf>=(714.9±5. 4<inf>stat</inf>±5.1<inf>syst</inf>) s<sup>-</sup>1 and derive the proton's pseudoscalar coupling g<inf>P</inf>(q02=-0.88mμ2)=8.06±0.55. © 2013 American Physical Society.
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Andreev, V. A., Banks, T. I., Carey, R. M., Case, T. A., Clayton, S. M., Crowe, K. M., Deutsch, J., Egger, J., Freedman, S. J., Ganzha, V. A., Gorringe, T., Gray, F. E., Hertzog, D. W., Hildebrandt, M., Kammel, P., Kiburg, B., Knaack, S., Kravtsov, P. A., Krivshich, A. G., et al. (2013). Measurement of muon capture on the proton to 1% precision and determination of the pseudoscalar coupling gP. Physical Review Letters, 110(1). https://doi.org/10.1103/PhysRevLett.110.012504 (Original work published 2013)