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Measurement of the energy spectrum of u_e from muon decay and implications for the Lorentz structure of the weak interaction
KARMEN group: B. Armbruster ; I. M. Blair ; B. A. Bodmann ; N. E. Booth ; G. Drexlin ; V. Eberhard ; J. A. Edgington ; C. Eichner ; K. Eitel ; E. Finckh ; H. Gemmeke ; J. Höss l ; T. Jannakos ; P. Jünger ; M. Kleifges ; J. Kleinfeller ; W. Kretschmer ; R. Maschuw ; C. Oehler ; P. Plischke ; J. Rapp ; C. Ruf ; M. Steidl ; O. Stumm ; J. Wolf ; B.Zeitnitz ;
Date:	24 Jun 1998
Journal:	Phys.Rev.Lett. 81 (1998) 520-523
Subject:	hep-ex
Abstract:	The KARMEN experiment uses the reaction 12C( u_e,e-)12N to measure the energy distribution of u_e emitted in muon decay at rest. The u_e analog omega_l of the famous Michel parameter ho has been derived from a maximum-likelihood analysis of events near the kinematic end point, E_max. The result, omega_l = (2.7^{+3.8}_{-3.3}pm 3.1) * 10^{-2}, is in good agreement with the standard model prediction omega_l= 0. We deduce a 90% confidence upper limit of omega_l <= 0.113, which corresponds to a limit of \|g^S_RL + 2 g^T_RL\| <= 0.78 on the interference term between scalar and tensor coupling constants.
Source:	arXiv, hep-ex/9806024
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