Measurement of σ(e+e−→π+π−γ) and extraction of σ(e+e−→π+π−) below 1 GeV with the KLOE detector

2004/07/31 by The KLOE Collaboration, F. Ambrosino, A. Aloisio +98 · 8 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.1016/j.physletb.2004.11.068

published as Phys.Lett.B606:12-24,2005 · 20 pages, 12 figures

openalex publication_date 2004/12/13 · arxiv created 2005/01/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01

Abstract

We have measured the cross section σ(e⁺e^-→ π⁺π^- γ) at an energy W=m_ϕ=1.02 GeV with the KLOE detector at the electron-positron collider DAΦNE. From the dependence of the cross section on the invariant mass of the two-pion system, we extract σ(e⁺e^-→ π⁺π^-) for the mass range 0.35<s<0.95 GeV². From this result, we calculate the pion form factor and the hadronic contribution to the muon anomaly, a_μ.

Cited by

• Nucleon form factors in dispersion theory
• The reaction e+e−→e+e−π+π− and the pion form factor measurements via the radiative return method
• Models of isospin breaking in the pion form factor: Consequences for the determination ofΠρω(mρ2)and(g−2)μ/2
• Improved predictions for g−2 of the muon and αQED(MZ2)
• Is the Difference Between the Pion Form Factor Measured in e+e- Annihilations and tau- Decays Due to an H- Propagator?
• Physics at a future Neutrino Factory and super-beam facility
• The muong−2and the bounds on the Higgs boson mass
• Nucleon electromagnetic form factors in the timelike region