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Predictions for g-2 of the muon and alpha(QED)(M(Z**2)).

Hagiwara, K. and Martin, A. D. and Nomura, D. and Teubner, T. (2004) 'Predictions for g-2 of the muon and alpha(QED)(M(Z**2)).', Physical review D : particles and fields., 69 . 093003.

Abstract

We calculate g–2 of the muon and the QED coupling alpha(MZ2), by improving the determination of the hadronic vacuum polarization contributions and their uncertainties. We include the recently reanalyzed CMD-2 data on e+e–-->pi+pi–. We carefully combine a wide variety of data for the e+e– production of hadrons and obtain the optimum form of R(s)[equivalent]sigmahad0(s)/sigmapt(s), together with its uncertainty. Our results for the hadronic contributions to g–2 of the muon are amuhad,LO = (692.4±5.9exp±2.4rad)×10–10 and amuhad,NLO = (–9.8±0.1exp±0.0rad)×10–10, and for the QED coupling Deltaalphahad(5)(MZ2) = (275.5±1.9exp±1.3rad)×10–4. These yield (g–2)/2 = 0.00116591763(74), which is about 2.4sigma below the present world average measurement, and alpha(MZ2)–1 = 128.954±0.031. We compare our g–2 value with other predictions and, in particular, make a detailed comparison with the latest determination of g–2 by Davier et al.

Item Type:Article
Full text:PDF - Other (975Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1103/PhysRevD.69.093003
Publisher statement:© 2004 by The American Physical Society. All rights reserved.
Record Created:28 Apr 2008
Last Modified:16 Aug 2011 09:23

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