- Colloquium: Prof. Simon Badger, “Two-to-Three Scattering Amplitudes in QCD”, 7th September 2021, https://indico.cern.ch/event/1070098/
Abstract: I will discuss the on-going efforts to bring theoretical predictions for 2->3 scattering processes in line with experimental measurements. The need to next-to-next-to-leading order (NNLO) QCD predictions for a wide class of experimental signatures has been understood for a long time however computational complexity has always stood in the way of making a complete set of predictions. In this talk I will describe the traditional bottlenecks found in scattering amplitude computations and modern methods that can overcome them.
- Dr. Max Zoller, “Two-loop tensor integral coefficients in OpenLoops”, 28th June 2022, https://arxiv.org/abs/2201.11615
Abstract: The development of a fully automated tool for the numerical calculation of NNLO corrections to scattering amplitudes is a highly desirable goal for the LHC era. Two-loop amplitudes can be expressed in terms of tensor integrals over two loop momenta with coefficients derived from the Feynman diagrams of a given scattering process. Hence, the calculation can be structured into the computation of the tensor coefficients, the reduction of the tensor integrals and the evaluation of the resulting master integrals. In this talk, we present a new algorithm to numerically construct the tensor coefficients for two-loop amplitudes in the OpenLoops framework. Exploiting the factorisation of Feynman diagrams into universal building blocks, we construct these coefficients in a highly efficient way. The algorithm is completely general and has been fully implemented and tested for QED and QCD corrections to the Standard Model. We will discuss the structure of the algorithm and present studies on its CPU efficiency and numerical stability.
- Colloquium: Prof. Claude Duhr Wednesday Nov 16, 2022: “The mathematics of precision physics”, https://indico.cern.ch/event/1220603/
Abstract:Precise predictions for observables in perturbative Quantum Field Theory require the evaluation of multi-loop scattering amplitudes and integrals. We review recent advances in understanding the mathematics underlying perturbative higher-order computations and how they have led to new results for precision collider observables.
- GEARING UP FOR HIGH-PRECISION LHC PHYSICS, Munich Institute for Astro-, Particle and Biophysics, 23/08/2022 by Costas G. Papadopoulos: “Recent progress in multi-loop & multi-scale integrals”
- HEP2023, April 5-8, 2023, Ioannina, Greece by Costas G. Papadopulos: “Higher-order corrections at the LHC: current status and prospects”
- Workshop on Future Accelerators APRIL 23 – APRIL 29, 2023, CORFU, Greece, 25/4/2023 by Costas G.Papadopoulos:”QCD higher-order corrections: current status and prospects”
- RADCOR 2023 – 16th International Symposium on Radiative Corrections: Applications of Quantum Field Theory to Phenomenology, 29 May – 2 June 2023, by Dhimiter Canko:”Two-Loop Amplitude Reduction using HELAC”
- RADCOR 2023 – 16th International Symposium on Radiative Corrections by Giuseppe Bevilacqua: “Applications of Quantum Field Theory to Phenomenology, 29 May – 2 June 2023 by Modelling uncertainties and prompt b-jet identification in tt ̄bb ̄ with dilepton signatures at the LHC”
- The Galileo Galilei Institute (GGI), Theory Challenges in the Precision Era of the Large Hadron Collider, Firenze, Aug 28, 2023 – Oct 13, 2023, September 11, 2023 by Costas G. Papadopoulos: “Integrand-level reduction with HELAC2LOOP”
- The Galileo Galilei Institute (GGI), Theory Challenges in the Precision Era of the Large Hadron Collider, Firenze, Aug 28, 2023 – Oct 13, 2023, September 11, 2023 by Giussepe Bevilacqua: “Studying additional jet activity in top pair production at the LHC”
- Vienna Theory Lunch Seminar, Vienna November 7th 2023 by Giussepe Bevilacqua: “Top quark pair production and decay with jet activity at the LHC”