Minutes of the 1954 Thanksgiving Meeting Held at Chicago, Illinois, November 26-27, 1954

Anonymous,

doi:10.1103/physrev.98.220

Phys. Rev.

1955

DOI: 10.1103/physrev.98.220

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Minutes of the 1954 Thanksgiving Meeting Held at Chicago, Illinois, November 26-27, 1954

Anonymous

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The history of the muon (g-2) experiments

Roberts

2019

SciPost Phys. Proc.

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I discuss the history of the muon (g − 2) measurements, beginning with the Columbia-Nevis measurement that observed parity violation in muon decay, and also measured the muon g-factor for the first time, finding g µ = 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 W , Z and Higgs bosons. The subsequent experiments, first at Nevis and then with increasing precision at CERN, measured the muon anomaly a µ = (g µ − 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 µ 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.

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The history of the muon (g-2) experiments

Roberts

2019

SciPost Phys. Proc.

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show abstract

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Minutes of the 1954 Thanksgiving Meeting Held at Chicago, Illinois, November 26-27, 1954

Cited by 1 publication

References 3 publications

The history of the muon (g-2) experiments

The history of the muon (g-2) experiments

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