Radiative corrections and Monte Carlo tools for low-energy hadronic cross sections in $e^+e^-$ collisions

Session

Loops in QED

Jun 8, 2023, 4:30 PM

KOL-F-101 (University of Zurich)

5. WP1: leptonic processes at NNLO & beyond

William Torres Bobadilla (Max-Planck-Institut für Physik)

6/8/23, 4:30 PM

6. WP2: Form factor contributions at N$^3$LO

Tim Engel (Uni Freiburg)

6/8/23, 4:45 PM

15. $e^+e^-\to\gamma\gamma^*$ at two loops in massless QED

Ryan Moodie (Turin University)

6/8/23, 5:10 PM

We present an analytic computation of $e^+e^-\to\gamma\gamma^*$ at two loops in massless QED. We reconstruct the analytic form of the amplitudes from numerical evaluations over finite fields. We express the integrals in a basis of Goncharov polylogarithms to obtain compact expressions. These contributions are required for N$^3$LO predictions of the inclusive process $e^+e^-\to\gamma^*$ and for...