The Radiative Return: A Review of Experimental Results

Abstract

The radiative return is a new method for hadronic cross section measurements at electron-positron colliders, which are operated at a fixed center-of-mass energy. In order to lower the effective hadronic mass M_hadr only such events are taken, in which one of the electrons or positrons has emitted an initial state radiation photon. We present precision measurements of the pion form factor from the Frascati phi-factory DAPHNE with the KLOE experiment and measurements of higher particle multiplicities as well as a measurement of the timelike proton-antiproton form factor from the BaBar experiment at the B-factory PEP-II. These radiative return measurements are compared to results, which are obtained by means of an energy scan, i.e. by means of a systematic variation of the beam energy of the collider. We also report on the impact of these measurements on the hadronic contribution of the anomalous magnetic moment of the muon, which is obtained via a dispersion integral using hadronic cross section data as input.

arXiv commentTalk given at the International Workshop " e+e- Collisions from phi to psi ", BINP Novosibirsk(Russia), Feb. 27 - March 2, 2006; 9 pages, 10 figures

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Cited by in corpus (7)

• Quest for precision in hadronic cross sections at low energy: Monte Carlo tools vs. experimental data
• Radiative Return Capabilities of a High-Energy, High-Luminosity $e^{+}{e}^{-}$ Collider
• Electron-positron annihilation into phi f_{0}(980) and clues for a new 1^{--} resonance
• ϕK^{+}K^{-} production in electron-positron annihilation
• Searching for Heavy Leptophilic $Z^{\prime }$: from Lepton Colliders to Gravitational Waves
• Final state radiation and a possibility to test a pion-photon interaction model near two-pion threshold
• High-dimensional Anomaly Detection with Radiative Return in $e^{+}{e}^{-}$ Collisions