Eur. Phys. J. C 22, 81-88 (2001)
DOI: 10.1007/s1005201O0784
NLO QED corrections to ISR in
e+ e- annihilation
and the measurement of
using tagged photons
G. 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 )
Abstract
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
