Towards numerical two-loop integrand reduction: HELAC2LOOP

by Konstantinos Papadopoulos (Nat. Cent. for Sci. Res. Demokritos (GR))

Monday 9 Feb 2026, 14:00 → 15:00 Europe/Zurich

4/3-006 - TH Conference Room (CERN)

In this talk I will present a method for the integrand-level reduction of two-loop helicity amplitudes in d=4–2ϵ dimensions. The amplitude is expressed in terms of a set of Feynman integrals and their coefficients that depend on the external kinematics. I will also review the ongoing development of the computational framework HELAC2LOOP, which numerically evaluates 1) the dimensionally regularized two-loop contributions, 2)  the integrand-level reduction coefficients, and 3) the associated integral-level coefficients in terms of master integrals, paving the road for the construction of an automated program for two-loop amplitude calculations for arbitrary scattering processes.