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

T. I. Banks

doi:10.1063/1.2813810

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

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 Λ_S=725.0±17. 4s^-1, from which the induced pseudoscalar coupling of the nucleon, g_P(q²=0.88m_μ²)=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 language	English (US)
Title of host publication	VII Latin American Symposium on Nuclear Physics and Applications
Pages	245-248
Number of pages	4
DOIs	https://doi.org/10.1063/1.2813810
State	Published - 2007
Externally published	Yes
Event	7th Latin American Symposium on Nuclear Physics and Applications - Cusco, Peru Duration: May 11 2007 → May 16 2007

Publication series

Name	AIP Conference Proceedings
Volume	947
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	7th Latin American Symposium on Nuclear Physics and Applications
Country/Territory	Peru
City	Cusco
Period	5/11/07 → 5/16/07

Keywords

Muon capture
Nucleon pseudoscalar form factor

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.1063/1.2813810

Cite this

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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.",

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AB - 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.

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

Abstract

Publication series

Conference

Keywords

ASJC Scopus subject areas

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