Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2006-02-20
Phys.Rev.D73:072003,2006
Physics
High Energy Physics
High Energy Physics - Experiment
Summary paper of E821 Collaboration measurements of the muon anomalous magnetic moment, each reported earlier in Letters or Br
Scientific paper
10.1103/PhysRevD.73.072003
We present the final report from a series of precision measurements of the muon anomalous magnetic moment, a_mu = (g-2)/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 a_mu(Expt) = 11 659 208.0(5.4)(3.3) x 10^-10, 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 a_mu includes contributions from virtual QED, weak, and hadronic processes. While the QED processes account for most of the anomaly, the largest theoretical uncertainty, ~0.55 ppm, 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.
Bennett Collaboration: G. W.
Muon
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