arXiv · nucl-ex/0202011
Precise Measurement of Muon Capture on the Proton
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.
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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. 2002-02-12. Precise Measurement of Muon Capture on the Proton. https://arxiv.org/abs/nucl-ex/0202011
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