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.
@article{arxiv.0710.4775,
title = {Two-Loop Heavy-Flavor Contribution to Bhabha Scattering},
author = {R. Bonciani and A. Ferroglia and A. A. Penin},
journal= {arXiv preprint arXiv:0710.4775},
year = {2008}
}
Comments
13 pages, 6 figures. Equations in the appendix generalized to the heavy-quark case