Update of the Hadronic Vacuum Polarisation Contribution to the muon g-2

Abstract

Precise data on e^+e^- to hadrons have recently become available and are used to compute the lowest-order hadronic vacuum polarisation contribution to the muon magnetic anomaly through dispersion relations. This is the case for the dominant pi+ pi- channel, but the most significant progress comes from the near completion of the BABAR program of measuring exclusive processes below 2 GeV with the initial-state radiation method which allows an efficient coverage of a large range of energies.. In this paper we briefly review the data treatment, the achieved improvements, and the result obtained for the full Standard Model prediction of the muon magnetic anomaly. The value obtained, a_mu (had~LO)=(692.6 +- 3.3)x 10^{-10} is 20% more precise than our last estimate in 2010. It deviates from the direct experimental determination by (27.4 +- 7.6)x 10^{-10} (3.6 sigma). Perpectives for further improvement are discussed.

arXiv comment6 pages, 8 figures, invited talk at the International Workshop on Tau Lepton Physics, IHEP, Beijing, September 19-23, 2016, references fixed

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• Constraints on charmphilic solutions to the muon g-2 with leptoquarks
• Muon g-2 in MSSM Gauge Mediation Revisited
• An extended gauge mediation for muon $(g-2)$ explanation
• Hadronic Vacuum Polarization in QCD and its Evaluation in the Euclidean