2022 Impact factor 4.4
Particles and Fields
Eur. Phys. J. C 25, 553-561 (2002)
DOI: 10.1140/epjc/s2002-01030-5

QED box amplitude in heavy fermion production

J. 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 ${\cal O}(\alpha^2)$ 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