Title page for ETD etd-04122001-101532

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
Piilonen, Leo E. Committee Chair
Abashian, Alexander Committee Member
Chang, Lay Nam Committee Member
Kinoshita, Kay Committee Member
Simonetti, John H. Committee Member
  • Standard Model
  • V-A Theory
  • Michel Parameter
  • Muon Decay
Date of Defense 2001-04-03
Availability unrestricted
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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