Measurement of σ(e+e−→π+π−) from threshold to 0.85 GeV2 using initial state radiation with the KLOE detector

2010/06/30 by KLOE Collaboration, F. Ambrosino, F. Archilli +46 · 205 citations
Physics and Astronomy · #Anomalous magnetic dipole moment #High-Energy Particle Collisions Research #Muon #Nuclear physics #Optics #Particle physics #Particle physics theoretical and experimental studies #Physics #Pion #Quantum Chromodynamics and Particle Interactions #Radiative transfer #hep-ex

paper · pdf · doi:10.1016/j.physletb.2011.04.055

published in Physics Letters B 700(2), 102-110 (Elsevier BV) · 17 pages, 11 figures, revised treatment of FSR uncertainty, version to appear on Physics Letters B

openalex publication_date 2011/04/30 · arxiv created 2011/05/21 · arxiv updated 2011/06/15 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We have measured the cross section of the radiative process e+e−→π+π−γ with the KLOE detector at the Frascati ϕ-factory DAΦNE, from events taken at a CM energy W=1 GeV. Initial state radiation allows us to obtain the cross section for e+e−→π+π−, the pion form factor |Fπ|2 and the dipion contribution to the muon magnetic moment anomaly, Δaμππ=(478.5±2.0stat±5.0syst±4.5th)×10−10 in the range 0.1<Mππ2<0.85 GeV2, where the theoretical error includes a SU(3) χPT estimate of the uncertainty on photon radiation from the final pions. The discrepancy between the Standard Model evaluation of aμ and the value measured by the Muon g-2 collaboration at BNL is confirmed.

Citations

• Review of Particle Physics
• Measurement of σ(e+e−→π+π−γ) and extraction of σ(e+e−→π+π−) below 1 GeV with the KLOE detector
• Precise Measurement of thee+e−→π+π−(γ)Cross Section with the Initial State Radiation Method atBABAR
• Final report of the E821 muon anomalous magnetic moment measurement at BNL
• Data handling, reconstruction, and simulation for the KLOE experiment
• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)

Cited by

• Precision study of the η → μ + μ − γ and ω → μ + μ − π 0 electromagnetic transition form-factors and of the ρ → μ + μ − line shape in NA60
• Low-energy hadronic cross sections measurements at BaBar and g− 2 of the muon
• BHLS₂ Upgrade : τ spectra, muon HVP and the [π⁰,~η,~η^′] System
• Improving the hadron physics of non-Standard-Model decays: example bounds on R-parity violation
• Pion form factor and reactionse+e−→ωπ0ande+e−→π+π−π+π−at energies up to 2–3 GeV in the many-channel approach
• Vacuum polarization contribution to muon g−2 as an inverse problem