Measurement of the muon capture rate in hydrogen gas and determination of the proton's pseudoscalar coupling gP.
作者信息
Andreev V A, Banks T I, Case T A, Chitwood D B, 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, Lauss B, Lynch K L, Maev E M, Maev O E, Mulhauser F, Ozben C S, Petitjean C, Petrov G E, Prieels R, Schapkin G N, Semenchuk G G, Soroka M A, Tishchenko V, Vasilyev A A, Vorobyov A A, Vznuzdaev M E, Winter P
机构信息
Petersburg Nuclear Physics Institute, Gatchina 188350, Russia.
出版信息
Phys Rev Lett. 2007 Jul 20;99(3):032002. doi: 10.1103/PhysRevLett.99.032002. Epub 2007 Jul 16.
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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