Andreev VA, Banks TI, Case TA, Chitwood DB, Clayton SM, Crowe KM, Deutsch J, Egger J, Freedman SJ, Ganzha VA, Gorringe T, Gray FE, Hertzog DW, Hildebrandt M, Kammel P, Kiburg B, Knaack S, Kravtsov PA, Krivshich AG, Lauss B, Lynch KL, Maev EM, Maev OE, Mulhauser F, Ozben CS, Petitjean C, Petrov GE, Prieels R, Schapkin GN, Semenchuk GG, Soroka MA, Tishchenko V, Vasilyev AA, Vorobyov AA, Vznuzdaev ME, Winter P. Measurement of the muon capture rate in hydrogen gas and determination of the proton's pseudoscalar coupling gP.
Phys Rev Lett 2007;
99:032002. [PMID:
17678281 DOI:
10.1103/physrevlett.99.032002]
[Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2007] [Indexed: 05/16/2023]
Abstract
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 microp atom was obtained from the difference between the micro(-) disappearance rate in hydrogen and the world average for the micro(+) decay rate, yielding Lambda(S)=725.0+/-17.4 s(-1), from which the induced pseudoscalar coupling of the nucleon, g(P)(q(2)=-0.88m(2)(micro))=7.3+/-1.1, is extracted.
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