scholarly journals Standard model tests in muon decay with the MEGA detector. Progress report, July 16, 1992--May 31, 1993

1993 ◽  
Author(s):  
C.A. Gagliardi ◽  
R.E. Tribble
Keyword(s):  
Standard Model ◽  
Muon Decay ◽  
Progress Report ◽  
Model Tests

scholarly journals The history of the muon (g-2) experiments

2019 ◽  
Author(s):  
B. Lee Roberts
Keyword(s):  
Standard Model ◽  
Quantum Electrodynamics ◽  
National Laboratory ◽  
New Physics ◽  
Brookhaven National Laboratory ◽  
Muon Decay ◽  
Higgs Bosons ◽  
The Standard Model ◽  
History Of ◽  
First Time

I discuss the history of the muon (g-2)(g−2) measurements, beginning with the Columbia-Nevis measurement that observed parity violation in muon decay, and also measured the muon gg-factor for the first time, finding g_\mu=2gμ=2. The theoretical (Standard Model) value contains contributions from quantum electrodynamics, the strong interaction through hadronic vacuum polarization and hadronic light-by-light loops, as well as the electroweak contributions from the WW, ZZ and Higgs bosons. The subsequent experiments, first at Nevis and then with increasing precision at CERN, measured the muon anomaly a_\mu = (g_\mu-2)/2aμ=(gμ−2)/2 down to a precision of 7.3 parts per million (ppm). The Brookhaven National Laboratory experiment E821 increased the precision to 0.54 ppm, and observed for the first time the electroweak contributions. Interestingly, the value of a_\muaμ measured at Brookhaven appears to be larger than the Standard Model value by greater than three standard deviations. A new experiment, Fermilab E989, aims to improve on the precision by a factor of four, to clarify whether this result is a harbinger of new physics entering through loops, or from some experimental, statistical or systematic issue.

scholarly journals Muon decay and physics beyond the standard model

2001 ◽  
Vol 73 (1) ◽  
pp. 151-202 ◽  
Author(s):  
Yoshitaka Kuno ◽  
Yasuhiro Okada
Keyword(s):  
Standard Model ◽  
Muon Decay ◽  
Beyond The Standard Model ◽  
The Standard Model
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