• Milestone

Final report of the E821 muon anomalous magnetic moment measurement at BNL

G. W. Bennett et al. (Muon g-2 Collaboration)
Phys. Rev. D 73, 072003 – Published 7 April 2006
An article within the collection: Physical Review D 50th Anniversary Milestones

Abstract

We present the final report from a series of precision measurements of the muon anomalous magnetic moment, aμ=(g2)/2. The details of the experimental method, apparatus, data taking, and analysis are summarized. Data obtained at Brookhaven National Laboratory, using nearly equal samples of positive and negative muons, were used to deduce aμ(Expt)=11659208.0(5.4)(3.3)×1010, where the statistical and systematic uncertainties are given, respectively. The combined uncertainty of 0.54 ppm represents a 14-fold improvement compared to previous measurements at CERN. The standard model value for aμ includes contributions from virtual QED, weak, and hadronic processes. While the QED processes account for most of the anomaly, the largest theoretical uncertainty, 0.55ppm, is associated with first-order hadronic vacuum polarization. Present standard model evaluations, based on e+e hadronic cross sections, lie 2.2–2.7 standard deviations below the experimental result.

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  • Received 26 January 2006

DOI:https://doi.org/10.1103/PhysRevD.73.072003

©2006 American Physical Society

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Physical Review D 50th Anniversary Milestones

This collection of seminal papers from PRD highlights research that remains central to developments today in particle physics, quantum field and string theory, gravitation, cosmology, and particle astrophysics.

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Vol. 73, Iss. 7 — 1 April 2006

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