The Radiative Return: A Review of Experimental Results

TL;DR

This review discusses the radiative return method for measuring hadronic cross sections at fixed-energy electron-positron colliders, highlighting recent experimental results from DAPHNE and BaBar and their implications for muon g-2 calculations.

Contribution

It provides a comprehensive overview of experimental results using the radiative return technique and compares them with energy scan data, emphasizing their impact on muon anomalous magnetic moment estimates.

Findings

Precision measurements of the pion form factor at DAPHNE.

Measurements of higher particle multiplicities and proton-antiproton form factors at BaBar.

Impact on the hadronic contribution to muon g-2.

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.