Eur. Phys. J. C 22, 81-88 (2001)
NLO QED corrections to ISR in e+ e- annihilation and the measurement of using tagged photonsG. Rodrigo1, A. Gehrmann-De Ridder1, 2, M. Guilleaume1 and J.H. Kühn1
1 Institut für Theoretische Teilchenphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany
2 Theory Division, CERN, 1211 Geneva 23, Switzerland
(Received: 14 June 2001 / Published online: 5 October 2001 - © Springer-Verlag / Società Italiana di Fisica 2001 )
The leptonic tensor for the process , 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 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 s1/2. 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 , which plays an important role in the theoretical description of the muon anomalous magnetic moment and the running of the electromagnetic coupling, is discussed.
© Società Italiana di Fisica, Springer-Verlag 2001