The MuCap experiment: A measurement of the muon capture rate in hydrogen gas

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We have recently measured the rate of nuclear muon capture by the proton, using a novel technique which involves a time projection chamber operating in ultraclean, deuterium-depleted hydrogen gas. The target's low gas density of 1% compared to liquid hydrogen is key to avoiding uncertainties that arise from the formation of muonic molecules. The capture rate from the hyperfine singlet ground state of the μp atom was obtained from the difference between the μ- disappearance rate in hydrogen and the world average for the μ+ decay rate, yielding ΛS=725.0±17. 4s-1, from which the induced pseudoscalar coupling of the nucleon, gP(q2=0.88mμ2)=7.3±1.1, is extracted. This result is consistent with theoretical predictions for g P that are based on the approximate chiral symmetry of QCD.

Original languageEnglish (US)
Title of host publicationVII Latin American Symposium on Nuclear Physics and Applications
Pages245-248
Number of pages4
DOIs
StatePublished - Dec 14 2007
Externally publishedYes
Event7th Latin American Symposium on Nuclear Physics and Applications - Cusco, Peru
Duration: May 11 2007May 16 2007

Publication series

NameAIP Conference Proceedings
Volume947
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference7th Latin American Symposium on Nuclear Physics and Applications
CountryPeru
CityCusco
Period5/11/075/16/07

Keywords

  • Muon capture
  • Nucleon pseudoscalar form factor

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • Cite this

    Banks, T. I. (2007). The MuCap experiment: A measurement of the muon capture rate in hydrogen gas. In VII Latin American Symposium on Nuclear Physics and Applications (pp. 245-248). (AIP Conference Proceedings; Vol. 947). https://doi.org/10.1063/1.2813810