Type of Document	Dissertation
Author	Lee, Fei-sheng
Author's Email Address	leefs1@yahoo.com
URN	etd-04122001-101532
Title	Measurement of the Michel Parameter Rho Using the MEGA Positron Spectrometer
Degree	PhD
Department	Physics
Advisory Committee	Advisor Name Title Leo E. Piilonen Committee Chair Alexanda Abashian Committee Member John Simonetti Committee Member Kay Kinoshita Committee Member Lay Nam Chang Committee Member
Keywords	V-A Theory Michel Parameter Muon Decay Standard Model
Date of Defense	2001-04-03
Availability	unrestricted
Abstract This experiment attempts to measure the Michel parameter Rho in normal muon decay Mu to e nu_{e} nu_{mu} with a precision of 0.001. The Standard Model with pure V-A interaction gives 0.75 for this parameter. The world average value is 0.7518 +/- 0.0026. A deviation of the value of Rho from 0.75 will indicate new physics. The experiment, RHO, was carried out at the Los Alamos Meson Physics Facility (LAMPF) of Los Alamos National Laboratory (LANL) in New Mexico, USA, in 1993. The existing experimental set-up that was built for the MEGA experiment was used for the RHO measurement. The experiment was a collaboration of about 50 physicists from Los Alamos National Laboratory, Stanford University, Fermi National Accelerator Laboratory, Virginia Tech, Texas A University, Indiana University, Valparaiso University, University of Houston, University of Chicago and University of Virginia. The result of the experiment is in agreement with Standard Model. The precision of this measurement was dominated by systematic uncertainties due to the fact that the positron spectrometer used in the measurement was designed for another experiment. Thus, the data analysis here focused mainly on the determination of systematic errors.
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