Numerical Perturbation Theory

Session

Afternoon 2

20 Nov 2025, 15:10

E41.1 (ETHZ)

12. bbH production: a theoretical laboratory for flavour-scheme studies

Christian Biello (Max-Planck Institute for Physics)

20/11/2025, 15:10

We present NNLO QCD predictions for Higgs boson production in association with a bottom-quark pair, matched to parton showers. This process provides a unique testing ground for precision QCD and flavour-scheme studies, as the presence of bottom quarks makes it suitable for investigating mass effects and factorisation schemes. In the collinear heavy-quark factorisation approach (5FS),...

8. Locally finite two-loop amplitudes for photoproduction in quark annihilation

Roshni Sahoo

20/11/2025, 15:35

Precise predictions for increasingly complex processes at higher perturbative orders call for a process-independent algorithm that can numerically integrate multi-loop amplitudes directly in momentum space. However, Feynman amplitudes are plagued by infrared and ultraviolet singularities which must be removed at the integrand level before numerical integration can be performed. In recent...

14. Locally finite QCD amplitudes and cross sections

Julia Karlen (ETH Zurich)

20/11/2025, 16:00

In this talk I will present a framework for local subtractions of infrared singularities in hadron collider cross sections and amplitudes. The construction is guided by infrared factorization and leads to integrands in loop momentum and phase space that are suitable for integration via numerical methods.

I will focus on electroweak production via quark–antiquark annihilation at NNLO. To...

13. Numerical Evaluation of the Two-Loop Dark Matter Power Spectrum in the EFTofLSS

Andrea Favorito (ETH Zürich)

20/11/2025, 16:25

This talk focuses on the application of modern numerical perturbative methods, familiar from collider physics, to the precision frontier of cosmology. To match the accuracy of modern cosmological surveys, theoretical predictions from the Effective Field Theory of Large-Scale Structure (EFTofLSS) must be pushed to the two-loop level, a task for which purely numerical techniques are essential...