NLO QED corrections to ISR in e+ e- annihilation and the measurement of σ(e+ e- \to hadrons) using tagged photons
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# NLO QED corrections to ISR in e+ e- annihilation and the measurement of σ(e+ e- \to hadrons) using tagged photons

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 Rodrigo García, Germán Vicente; Gehrmann-De Ridder, Aude; Guilleaume, Marc; Kühn, Johann H. This document is a artículoDate2001 Este documento está disponible también en : http://hdl.handle.net/10550/44585 The leptonic tensor for the process e+e−→γ+γ∗, which describes the next-to-leading order virtual and soft QED corrections to initial state radiation in e+e− annihilation with emission of an extra virtual photon decaying into hadrons, is calculated. A Monte Carlo generator for the reaction e+e−→γ+π+π− has been set up which includes these corrections. It thus describes configurations where the invariant mass of the hadrons plus photon is very close to s√. Predictions for cms energies of 1 to 10 GeV, corresponding to the energies of DAPHNE and B-meson factories, are presented. The possibility for an accurate measurement using tagged photons of σ(e+e−→hadrons), which plays an important role in the theoretical description of the muon anomalous magnetic moment and the running of the electromagnetic coupling, is discussed. Rodrigo García, Germán Vicente Gehrmann-De Ridder, Aude Guilleaume, Marc Kühn, Johann H. 2001 NLO QED corrections to ISR in e+ e- annihilation and the measurement of σ(e+ e- \to hadrons) using tagged photons European Physical Journal C 22 1 81 88 http://dx.doi.org/10.1007/s100520100784