Conveners
Parallel 1
- Thomas Hahn (Max-Planck Institut für Physik München)
Parallel 1
- Thomas Hahn (Max-Planck Institut für Physik München)
I will present ideas to compute helicity amplitudes for multiloop/multileg scattering amplitudes directly in the so-called 't Hooft-Veltman scheme, avoiding evanescent structures and ambiguities in the scheme definitions.
I will present results on five-point two-loop planar and non-planar Master Integrals. Based on the Simplified Differential Equations approach, analytic representation in terms of Goncharov polylogarithms, for the planar and hexa-box families, has been obtained. These results are a necessary ingredient for the calculation of many two-loop two-to-three processes of interest at the LHC.
Scattering amplitudes serve as a bridge between theoretical predictions and experimental data and are therefore key objects in QFT. Although much progress has been made in this field, it is still very hard to compute scattering amplitudes at higher orders in perturbation theory. I will describe modern methods for the computation of amplitudes in general field theories and present new results...
Over the coming decade, the experimental program at the LHC will reach unprecedented levels of precision. To match this on the theory side, extremely complicated amplitude calculations must be performed. Recently, we have witnessed a boom in analytic calculations of scattering amplitudes, pushed forward by the application of finite fields and Ansatz methodology. These approaches have made...
In this talk, I will present recent achievements in cross-section predictions obtained with the sector-improved residue subtraction scheme at NNLO QCD. In particular, I will review results on cross sections for two-to-three processes involving jets and photons, I will also discuss top-quark mass effects in Higgs-boson production, and demonstrate how to include fragmentation our subtraction scheme.
pySecDec is a program to evaluate multi-loop Feynman integrals numerically based on the sector decomposition approach; its new release version 1.5 introduces features significantly improving its performance: automatic adaptive evaluation of weighted sums of integrals (e.g. amplitudes) and asymptotic expansion in kinematic ratios. I'd like to briefly review both, illustrating the expected...
