2017/11/08 by The KLOE Collaboration, A. Anastasi, 2 Collaboration +136
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph
paper · pdf · doi:10.48550/arxiv.1711.03085
20 pages, 8 figures. Version as published in JHEP 1803 (2018) 173
openalex publication_date 2017/11/08 · openalex created_date 2017/11/17 · arxiv created 2018/06/08 · arxiv updated 2018/06/11 · openalex updated_date 2026/07/28
The three precision measurements of the cross section σ(e+e-→π+π-γ(γ)) using initial state radiation by the KLOE collaboration provide an important input for the prediction of the hadronic contribution to the anomalous magnetic moment of the muon. These measurements are correlated for both statistical and systematic uncertainties and, therefore, the simultaneous use of these measurements requires covariance matrices that fully describe the correlations. We present the construction of these covariance matrices and use them to determine a combined KLOE measurement for σ(e+e-→π+π-γ(γ)). We find, from this combination, a two-pion contribution to the muon magnetic anomaly in the energy range 0.10 < s < 0.95 GeV2 of aμπ+π- = (489.8 ± 1.7\rm stat ± 4.8\rm sys ) × 10-10.