Measurement of $σ(e^+e^- \to π^+π^-)$ at DA$Φ$NE with the radiative return

Details Measurement of $σ(e^+e^- \to π^+π^-)$ at DA$Φ$NE with the radiative return Measurement of $σ(e^+e^- \to π^+π^-)$ at DA$Φ$NE with the radiative return

2003-12-22

arxiv.org/abs/hep-ex/0312056v2

ECONF C0309101:FRWP008,2003

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 5 figures, Invited talk at the Workshop on e+e- in the 1-2 GeV range, Alghero, Italy, September 2003 (eConf C0309101)

Scientific paper

The measurement of hadronic cross sections at low centre-of-mass energies is currently attracting much interest because of the r\^o{}le these measurements play in the theoretical evaluation of the anomalous magnetic moment of the muon. The KLOE experiment at the DA$\Phi$NE $\phi$-factory in Frascati aims to determine the cross section of the dominant contribution $e^{+}e^{-} \to \pi^{+}\pi^{-}$ at energies below 1 GeV exploiting the radiative return from the $\phi$ to the $\rho$ and $\omega$ mesons. This method has systematic errors completely different from previous measurements and allows a cross check of existing data in this energy region. The method and results on both the differential cross section for $e^{+}e^{-} \to \pi^{+}\pi^{-}\gamma$ and the total cross section for $e^{+}e^{-} \to \pi^{+}\pi^{-}$ are presented.

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