Measurement of the e⁺e⁻ → π⁺π⁻π⁰π⁰ Cross Section Using Initial-State Radiation at BABAR


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 (g(μ)(π⁺π⁻ 2π⁰) - 2)/2 = (17.9 ± 0.1(stat) ± 0.6(syst)) x 10⁻¹⁰ in the energy range 0.85 < E(CM) < 1.8 GeV. In the same energy range, the impact on the running of the fine-structure constant at the Z⁰-pole is determined as Δα(π⁺π⁻ 2π⁰) (M(z)²) = (4.44 ± 0.02 (stat) ± 0.14 (syst)) x 10⁻⁴. Furthermore, intermediate resonances are studied and especially the cross section of the process e⁺e⁻ → ωπ⁰ → π⁺π⁻ 2π⁰ is measured.



Photons, Storage-ring, Final-states, Monte-carlo, Annihilation, Detector, Collisions, Astronomy & astrophysics, Physics


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