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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

nucl-exarXiv:nucl-ex/0202011

Abstract

The aim of the MuCap experiment is a 1% measurement of the singlet capture rate LambdaS for the basic electro-weak reaction mu + p -> n + numu. This observable is sensitive to the weak form-factors of the nucleon, in particular to the induced pseudoscalar coupling constant gP. 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 H2 gas at 10 bar. Low density compared to liquid H2 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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