Eur. Phys. J. C 25, 215-222 (2002)
DOI: 10.1007/s10052-002-0999-6
The radiative return at small angles: virtual corrections
J.H. Kühn1, 2 and G. Rodrigo11 Theory Division, CERN, 1211 Geneva 23, Switzerland
2 Institut für Theoretische Teilchenphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany
(Received: 24 April 2002 / Published online: 12 July 2002 )
Abstract
Virtual corrections for electron-positron annihilation into
one real and one off-shell photon of invariant mass
Q2 are evaluated.
Special attention is paid to those configurations where the real photon
is collinear with the beam direction. This calculation is an important
ingredient of a Monte Carlo program, which simulates events with tagged
photons from initial-state radiation, including NLO corrections.
© Società Italiana di Fisica, Springer-Verlag 2002