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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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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.

Aquest document és un/a article, creat/da en: 2001

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.

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