Measurement of the Muon Capture Rate in Hydrogen Gas and Determination of the Proton's Pseudoscalar Coupling g{sub P}

Journal Article · Fri Jul 20 00:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.99.032002· OSTI ID:20957896

Andreev, V A; Ganzha, V A; Kravtsov, P A; Krivshich, A G; Maev, E M; Maev, O E; Petrov, G E; Schapkin, G N; Semenchuk, G G; Soroka, M A; Vasilyev, A A; Vorobyov, A A; Vznuzdaev, M E ^[1]; Banks, T I; Case, T A; Crowe, K M; Freedman, S J; Gray, F E; Lauss, B ^[2]; Chitwood, D B ^[3]

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1. Petersburg Nuclear Physics Institute, Gatchina 188350 (Russian Federation)
2. University of California, Berkeley, and LBNL, Berkeley, California 94720 (United States)
3. University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)

The rate of nuclear muon capture by the proton has been measured using a new technique based on a time projection chamber operating in ultraclean, deuterium-depleted hydrogen gas, which is key to avoiding uncertainties from muonic molecule formation. The capture rate from the hyperfine singlet ground state of the {mu}p atom was obtained from the difference between the {mu}{sup -} disappearance rate in hydrogen and the world average for the {mu}{sup +} decay rate, yielding {lambda}{sub S}=725.0{+-}17.4 s{sup -1}, from which the induced pseudoscalar coupling of the nucleon, g{sub P}(q{sup 2}=-0.88m{sub {mu}}{sup 2})=7.3{+-}1.1, is extracted.

• OSTI ID: 20957896
• Journal Information: Physical Review Letters, Vol. 99, Issue 3; Other Information: DOI: 10.1103/PhysRevLett.99.032002; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CAPTURE
COUPLING
DEUTERIUM
GROUND STATES
HYDROGEN
MUONIC MOLECULES
MUONS MINUS
MUONS PLUS
PARTICLE DECAY
PROTONS
TIME PROJECTION CHAMBERS