Heavy-flavor contribution to Bhabha scattering.
We evaluate the last missing piece of the two-loop QED corrections to the high-energy electron-positron scattering cross section originating from the vacuum polarization by heavy fermions. The calculation is performed within a new approach applicable to a wide class of perturbative problems with mass hierarchy. The result is crucial for the high-precision physics program at existing and future e(+) e(-) colliders.
Departamento de Física Teòrica, IFIC, CSIC-Universidad de Valencia, E-46071 Valencia, Spain.
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Bonciani
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Ferroglia
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Penin