Bhabha Scattering at NNLO

TL;DR

This paper reviews the recent progress in calculating NNLO QED corrections to large angle Bhabha scattering, emphasizing two-loop virtual corrections with heavy-flavor loops and their impact at 1-GeV colliders.

Contribution

It presents the latest two-loop virtual correction calculations involving heavy-flavor fermion loops in Bhabha scattering at NNLO in QED.

Findings

Heavy-flavor fermion loops significantly affect the Bhabha scattering cross section.

The corrections are numerically relevant at 1-GeV collider energies.

The study enhances precision predictions for collider experiments.

Abstract

We review the status of the calculation of next-to-next-to-leading order corrections to large angle Bhabha scattering in pure QED. After discussing the electron-loop and photonic corrections, we focus on the recently calculated two-loop virtual corrections involving a heavy-flavor fermion loop. We conclude by assessing the numerical impact of these corrections on the Bhabha scattering cross section at colliders operating at a center of mass energy of about 1-GeV.