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19 April 2024

» arxiv » nucl-ex/0202011

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Precise Measurement of Muon Capture on the Proton
P. Kammel ; V. A. Andreev ; D. V. Balin ; R. M. Carey ; T. Case ; D. B. Chitwood ; S. M. Clayton ; K. M. Crowe ; J. Deutsch ; P. T. Debevec ; P. U. Dick ; A. Dijksman ; J. Egger ; D. Fahrni ; A. A. Fetisov ; S. J. Freedman ; V. A. Ganzha ; B. Gartner ; J. Govaerts ; F. E. Gray ; F. J. Hartmann ; W. D. Herold ; D. W. Hertzog ; V. I. Jatsoura ; A. G. Krivshich ; B. Lauss ; E. M. Maev ; O. E. Maev ; V. E. Markushin ; C. J. G. Onderwater ; C. Petitjean ; G. E. Petrov ; C. C. Polly ; R. Prieels ; S. M. Sadetsky ; G. N. Schapkin ; R. Schmidt ; G. G. Semenchuk ; M. Soroka ; A. A. Vorobyov ; N. I. Voropaev ;
Date:	12 Feb 2002
Subject:	nucl-ex
Abstract:	The aim of the MuCap experiment is a 1% measurement of the singlet capture rate Lambda_S for the basic electro-weak reaction mu + p -> n + nu_mu. This observable is sensitive to the weak form-factors of the nucleon, in particular to the induced pseudoscalar coupling constant g_P. It will provide a rigorous test of theoretical predictions based on the Standard Model and effective theories of QCD. The present method is based on high precision lifetime measurements of mu^- in hydrogen gas and the comparison with the free mu^+ lifetime. The mu^- experiment will be performed in ultra-clean, deuterium-depleted H_2 gas at 10 bar. Low density compared to liquid H_2 is chosen to avoid uncertainties due to ppmu formation. A time projection chamber acts as a pure hydrogen active target. It defines the muon stop position in 3-D and detects rare background reactions. Decay electrons are tracked in cylindrical wire-chambers and a scintillator array covering 75% of 4 pi.
Source:	arXiv, nucl-ex/0202011
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