Two-Loop Heavy-Flavor Contribution to Bhabha Scattering

Abstract

We evaluate the two-loop QED corrections to the Bhabha scattering cross section which involve the vacuum polarization by heavy fermions of arbitrary mass m_f >> m_e. The results are valid for generic values of the Mandelstam invariants s,t,u >> m_e^2.

13 pages, 6 figures. Equations in the appendix generalized to the heavy-quark case

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