1. Combination of KLOE σ (e+e− → π+π−γ(γ)) measurements and determination of $$ {a}_{\mu}^{\pi^{+}{\pi}^{-}} $$ in the energy range 0.10 < s < 0.95 GeV2
- Author
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Paolo Santangelo, G. Venanzoni, P. Fermani, A. Passeri, Antonio Budano, N. Raha, E. P. Solodov, V. De Leo, P. A. Lukin, L. Tortora, Magnus Wolke, Stefan E. Müller, Michał Silarski, E. A. Kozyrev, Florin Sirghi, Wojciech Krzemien, D. Moricciani, S. Loffredo, P. Branchini, Aleksander Gajos, A. De Santis, Paweł Moskal, Gianfranco Morello, Filippo Ceradini, W. Wislicki, A. Selce, A. Keshavarzi, G. D'Agostini, E. Dané, M. Berlowski, S. Miscetti, A. Di Domenico, V. L. Ivanov, Vincenzo Patera, Andrzej Kupsc, Thomas Teubner, R. Messi, T. Johansson, B. Cao, Paolo Ciambrone, Marco Schioppa, D. Kisielewska-Kamińska, F. Bossi, G. Fantini, S. Giovannella, D. Domenici, P. De Simone, C. Bloise, Giuseppe Mandaglio, M. Martini, E. De Lucia, X. Kang, A. Fantini, D. Babusci, P. Gauzzi, A. Anastasi, A. D'Uffizi, E. Perez del Rio, Eryk Czerwiński, L. Caldeira Balkeståhl, Francesca Curciarello, S. Fiore, E. Graziani, A. Di Cicco, and Fiore, S.
- Subjects
Physics ,Nuclear and High Energy Physics ,Range (particle radiation) ,Particle physics ,e+-e- Experiments ,Muon ,Anomalous magnetic dipole moment ,010308 nuclear & particles physics ,Hadron ,State (functional analysis) ,Covariance ,01 natural sciences ,0103 physical sciences ,Anomaly (physics) ,010306 general physics ,Energy (signal processing) - Abstract
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 $$ {a}_{\mu}^{\pi^{+}{\pi}^{-}}=\left(489.8\pm {1.7}_{\mathrm{stat}}\pm {4.8}_{\mathrm{sys}}\right)\times {10}^{-10} $$ a μ π + π − = 489.8 ± 1.7 stat ± 4.8 s y s × 10 − 10 . Data vectors and covariance matrices are available at http://www.lnf.infn.it/kloe/ppg/ ppg_2017/ppg_2017.html.
- Published
- 2018
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