Measurement of muon capture on the proton to 1% precision and determination of the pseudoscalar coupling gP

V. A. Andreev, T. I. Banks, R. M. Carey, T. A. Case, S. M. Clayton, K. M. Crowe, J. Deutsch, J. Egger, S. J. Freedman, V. A. Ganzha, T. Gorringe, F. E. Gray, D. W. Hertzog, M. Hildebrandt, P. Kammel, B. Kiburg, S. Knaack, P. A. Kravtsov, A. G. Krivshich, B. LaussK. R. Lynch, E. M. Maev, O. E. Maev, F. Mulhauser, C. Petitjean, G. E. Petrov, R. Prieels, G. N. Schapkin, G. G. Semenchuk, M. A. Soroka, V. Tishchenko, A. A. Vasilyev, A. A. Vorobyov, M. E. Vznuzdaev, P. Winter

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Abstract

The MuCap experiment at the Paul Scherrer Institute has measured the rate ΛS 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. ΛS is determined from the difference between the μ- disappearance rate in hydrogen and the free muon decay rate. The result is based on the analysis of 1.2×1010 μ- decays, from which we extract the capture rate ΛS=(714.9±5. 4stat±5.1syst) s-1 and derive the proton's pseudoscalar coupling gP(q02=-0.88mμ2)=8.06±0.55.

Original languageEnglish (US)
Article number012504
JournalPhysical Review Letters
Volume110
Issue number1
DOIs
StatePublished - Jan 3 2013
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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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., ... Winter, P. (2013). Measurement of muon capture on the proton to 1% precision and determination of the pseudoscalar coupling gP. Physical Review Letters, 110(1), [012504]. https://doi.org/10.1103/PhysRevLett.110.012504