Muon decay: measurement of the transverse polarization of the decay positrons and its implications for the fermi coupling constant and time reversal invariance.

N. Danneberg, W. Fetscher,* K.-U. Kohler, J. Lang, T. Schweizer, A. von Allmen, K. Bodek, L. Jarczyk, S. Kistryn, J. Smyrski, A. Strzalkowski, J. Zejma, K. Kirch, A. Kozela, and E. Stephan Institute for Particle Physics (IPP), ETH Zurich, 8093 Zurich, Switzerland Institute of Physics, Jagellonian University, Krakow, Poland Paul Scherrer Institut, CH-5232 Villigen-PSI, Switzerland H. Niewodniczanski Institute of Nuclear Physics, Krakow, Poland Institute of Physics, University of Silesia, Katowice, Poland (Received 2 July 2004; revised manuscript received 28 October 2004; published 19 January 2005)