DOI: 10.1140/epjc/s2002-01030-5
QED box amplitude in heavy fermion production
J. Portolés and P.D. Ruiz-FemeníaDepartament de Física Teòrica, IFIC, Universitat de València - CSIC, Apt. Correus 22085, 46071 València, Spain
(Received: 13 June 2002 / Published online: 24 September 2002 )
Abstract
We evaluate the two-photon box contribution to heavy fermion
production in electron positron annihilation, that provides
electromagnetic corrections to the Born
cross
section. The study of its
non-relativistic expansion, relevant at energies close to the
threshold of production, is also performed. We also verify that
the
threshold expansion of the one-loop integrals correctly reproduces
our results, thus extending the applicability of this technique
to
heavy fermion production diagrams.
© Società Italiana di Fisica, Springer-Verlag 2002
