Abstract.
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.
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Received: 11 July 2002 / Published online: 24 September 2002
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Portolés, J., Ruiz-Femenía, P. QED box amplitude in heavy fermion production. Eur. Phys. J. C 25, 553–561 (2002). https://doi.org/10.1140/epjc/s2002-01030-5
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DOI: https://doi.org/10.1140/epjc/s2002-01030-5