Theory of particle collider processes at ultimate precision

Informations projet

TOPUP

N° de convention de subvention: 101019620

DOI

10.3030/101019620

Date de signature de la CE 27 Mai 2021

Date de début 1 Septembre 2021

Date de fin 31 Août 2026

Financé au titre de

• EXCELLENT SCIENCE - European Research Council (ERC)

Coût total

€ 2 459 915,00

Contribution de l’UE

€ 2 459 915,00

Coordonné par

UNIVERSITAT ZURICH
Switzerland

Periodic Reporting for period 3 - TOPUP (Theory of particle collider processes at ultimate precision)

Période du rapport: 2024-09-01 au 2026-02-28

Résumé du contexte et des objectifs généraux du projet

The Large Hadron Collider (LHC) at CERN probes the interaction of elementary particles at unprecedented energy and to very high precision. The full exploitation of the upcoming data from the LHC relies on a close interplay between theory and experiment, which calls in particular for highly accurate theoretical predictions. This theoretical accuracy can be achieved only though the expansion of the fundamental scattering amplitudes to sufficiently high order in perturbation theory.

This project aims to meet this challenge for modern collider physics by providing the conceptual and technical foundations for theory predictions at ultimate precision. It will develop and establish a new standard of theoretical precision in the description of physical observables at the LHC based on perturbation theory expanded to the third non-trivial order (N3LO). We will achieve this ambitious goal by targeting the main obstacles in present-day methods, and by developing novel ways for the computation of multi-loop scattering amplitudes and in the understanding and handling of unresolved multi-particle emission.

The concrete goal of the project is to enable theoretical predictions at ultimate precision for multiple processes in high-energy particle collisions with full final state kinematical information. This will lead to a more precise extraction of fundamental physics parameters, such as couplings and particle masses, and will shape the LHC precision physics program.

Travail effectué depuis le début du projet jusqu’à la fin de la période considérée dans le rapport et principaux résultats atteints jusqu’à présent

The project has started in the fall of 2021. Its early results include several conceptual and methodological developments that will subsequently enable high-precision predictions for processes at the CERN LHC collider. As a first application,
we computed fully differential observables in lepton pair production at the CERN LHC, which are immediately relevant to precision measurements of gauge boson masses and electroweak coupling parameters at the LHC.

Progrès au-delà de l’état des connaissances et impact potentiel prévu (y compris l’impact socio-économique et les conséquences sociétales plus larges du projet jusqu’à présent)

Highly precise predictions in particle theory require an intricate combination of exact algebraic calculations and accurate numerical algorithms. In this project, we are aiming for major innovations in both directions. Early project results have overcome several long-standing limitations of established methodologies, and have produced innovative approaches to address the complexity challenges posed by modern precision applications of particle theory and beyond.

Momentum spectrum of lepton pairs at LHC, compared to precision theory prediction (blue).