Multi-Scale Amplitudes For Collider Physics

01 October 2023 → 30 September 2028
European funding: framework programme
Research disciplines
No data available
colider physics
Other information
Project description

The large amount of data that will be collected by experiments at the Large Hadron Collider in the coming years will lead to an
unprecedented increase in the precision of their measurements. To benefit from these precise measurements and improve our
understanding of the fundamental laws of physics, we must obtain a broad set of theoretical predictions to corresponding levels of
precision. Crucially, these predictions require the computation of multi-particle multi-scale two-loop scattering amplitudes involving
massive particles. This poses a formidable challenge that we are currently unable to meet.
In recent years, a new framework for the calculation of amplitudes has begun to emerge. Building on a deep understanding of the
physical and mathematical properties of the amplitudes, it uses numerical evaluations to constrain an Ansatz for the analytic form of
the amplitude.
Working in this framework, MultiScaleAmp will redefine the state of the art in multi-scale two-loop amplitude calculation by singling
out the main bottlenecks in current approaches. In particular, it will make use of geometric and mathematical tools to understand the
analytic structures which underpin the amplitudes, and introduce techniques which can handle a number of scales beyond the reach
of current approaches. This will lead to a wide set of two-loop amplitude calculations, triggering a new era of theoretical precision.
In summary, MultiScaleAmp will make revolutionary conceptual developments in multi-scale amplitude computations, and usher in a
new era of precision at hadron colliders. It will deliver:
1. Novel approaches for the computation of multi-scale Feynman integrals.
2. New techniques for the computation of two-loop amplitudes with many scales.
3. The necessary two-loop amplitudes for the production at hadron colliders of jets in association
with heavy particles such as Higgs bosons, top quarks or vectors bosons.

Funded by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Research Council Executive Agency (ERCEA). Neither the European Union nor the authority can be held responsible for them.