The European Physical Journal C

, Volume 66, Issue 1–2, pp 1–9 | Cite as

Reevaluation of the hadronic contribution to the muon magnetic anomaly using new e + e π + π cross section data from BABAR

  • M. Davier
  • A. Hoecker
  • B. Malaescu
  • C. Z. Yuan
  • Z. Zhang
Open Access
Regular Article - Experimental Physics

Abstract

Using recently published, high-precision π + π cross section data by the BABAR experiment from the analysis of e + e events with high-energy photon radiation in the initial state, we reevaluate the lowest order hadronic contribution \((a_{\mu}^{\mathrm{had},\mathrm{LO}})\) to the anomalous magnetic moment of the muon. We employ newly developed software featuring improved data interpolation and averaging, more accurate error propagation and systematic validation. With the new data, the discrepancy between the e + e - and τ-based results for the dominant two-pion mode reduces from previously 2.4σ to 1.5σ in the dispersion integral, though significant local discrepancies in the spectra persist. We obtain for the e + e -based evaluation \(a_{\mu}^{\mathrm{had},\mathrm{LO}}=(695.5\pm4.1)\times 10^{-10}\) , where the error accounts for all sources. The full Standard Model prediction of a μ differs from the experimental value by 3.2σ.

Keywords

Cross Section Data Radiative Correction Polynomial Interpolation BABAR Collaboration BABAR Data 

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Copyright information

© Springer-Verlag / Società Italiana di Fisica 2010

Authors and Affiliations

  • M. Davier
    • 1
  • A. Hoecker
    • 2
  • B. Malaescu
    • 1
  • C. Z. Yuan
    • 3
  • Z. Zhang
    • 1
  1. 1.Laboratoire de l’Accélérateur Linéaire, IN2P3/CNRSUniversité Paris-Sud 11OrsayFrance
  2. 2.CERNGeneva 23Switzerland
  3. 3.Institute of High Energy PhysicsChinese Academy of SciencesBeijingChina

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