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.
Keywords
Cite
@article{arxiv.nucl-ex/0202011,
title = {Precise Measurement of Muon Capture on the Proton},
author = {P. Kammel and V. A. Andreev and D. V. Balin and R. M. Carey and T. Case and D. B. Chitwood and S. M. Clayton and K. M. Crowe and J. Deutsch and P. T. Debevec and P. U. Dick and A. Dijksman and J. Egger and D. Fahrni and A. A. Fetisov and S. J. Freedman and V. A. Ganzha and B. Gartner and J. Govaerts and F. E. Gray and F. J. Hartmann and W. D. Herold and D. W. Hertzog and V. I. Jatsoura and A. G. Krivshich and B. Lauss and E. M. Maev and O. E. Maev and V. E. Markushin and C. J. G. Onderwater and C. Petitjean and G. E. Petrov and C. C. Polly and R. Prieels and S. M. Sadetsky and G. N. Schapkin and R. Schmidt and G. G. Semenchuk and M. Soroka and A. A. Vorobyov and N. I. Voropaev},
journal= {arXiv preprint arXiv:nucl-ex/0202011},
year = {2007}
}
Comments
Int. RIKEN Conf. on Muon Catalyzed Fusion and Related Exotic Atoms, April 2001, Shimoda, Japan, to be published in Hyperfine Interactions