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

By M. Davier, Andreas Hoecker, Bogdan Malaescu, C. Yuan, Z. Zhang. 2009

168 citations recorded by the source corpus.

AbstractUsing 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 aμ differs from the experimental value by 3.2σ.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/3f96c7054cb6774064638de8394631f5d04dc47e

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In Nuclear and High Energy Physics

Citations in the corpus

An update of the HLS estimate of the muon g−2 (2012, methodology): “The main reason was, at this step, to avoid discussing the reported tension [8, 30] between the various existing π+π− data sets: the scan data sets just quoted, and the data sets collected using the Initial State Radiation (ISR) method by KLOE [31, 32] and BaBar [33, 34], not to mention the pion for”
Jet energy measurement with the ATLAS detector in proton-proton collisions at sqrt(s) = 7 TeV (2011, methodology): “The combination of the in situ calibration data is performed using the software package HVPTools [95].”
Jet energy measurement with the ATLAS detector in proton-proton collisions at $\sqrt{\mathrm{s}}=7\ \mathrm{TeV}$ (2013, methodology): “The combination of the in situ calibration data is performed using the software package HVPTools [95].”