# Measurement of the ${e}^{+}{e}^{{-}}{\rightarrow}{{\pi}}^{+}{{\pi}}^{{-}}{{\pi}}^{0}{{\pi}}^{0}$ cross section using initial-state radiation at BABAR

Abstract : The process e+e-→π+π-2π0γ is investigated by means of the initial-state radiation technique, where a photon is emitted from the incoming electron or positron. Using 454.3  fb-1 of data collected around a center-of-mass energy of s=10.58  GeV by the BABAR experiment at SLAC, approximately 150000 signal events are obtained. The corresponding nonradiative cross section is measured with a relative uncertainty of 3.6% in the energy region around 1.5 GeV, surpassing all existing measurements in precision. Using this new result, the channel’s contribution to the leading order hadronic vacuum polarization contribution to the anomalous magnetic moment of the muon is calculated as (gμπ+π-2π0-2)/2=(17.9±0.1stat±0.6syst)×10-10 in the energy range 0.85  GeV
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Article dans une revue
Phys.Rev.D, 2017, 96 (9), pp.092009. 〈10.1103/PhysRevD.96.092009〉

https://hal.archives-ouvertes.fr/hal-01669720
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Soumis le : jeudi 21 décembre 2017 - 00:12:33
Dernière modification le : mardi 17 avril 2018 - 00:33:23

### Citation

J.P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, et al.. Measurement of the ${e}^{+}{e}^{{-}}{\rightarrow}{{\pi}}^{+}{{\pi}}^{{-}}{{\pi}}^{0}{{\pi}}^{0}$ cross section using initial-state radiation at BABAR. Phys.Rev.D, 2017, 96 (9), pp.092009. 〈10.1103/PhysRevD.96.092009〉. 〈hal-01669720〉

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