QED box amplitude in heavy fermion productionJ. Portolés and P.D. Ruiz-Femenía
Departament de Física Teòrica, IFIC, Universitat de València - CSIC, Apt. Correus 22085, 46071 València, Spain
(Received: 13 June 2002 / Published online: 24 September 2002 )
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