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A Computational Framework for Beyond-NLL Resummation of Jet Observables at Colliders

Project description

Advanced quantum calculations to predict high-energy particle collisions

Quantum chromodynamics calculations are foundational to interpreting high-energy particle collisions. They have famously enabled the discovery of the Higgs boson at the Large Hadron Collider (LHC). However, as the LHC generates high-quality data from Run 3, standard theoretical predictions are hitting a wall. Current frameworks cannot handle multiple soft-collinear particle emissions that dominate these high-energy environments as large mathematical logarithms disrupt calculations. Supported by the Marie Skłodowska-Curie Actions programme, the BRUTUS project aims to build a new theoretical framework to meet this need for higher accuracy. The proposed tool will automate highly advanced logarithmic resummations and will account for ignored non-global jet variables. This should help provide the flexible, high-precision predictions necessary for revealing new physics.

Objective

The BRUTUS (Beyond-NLL ResUmmation in a Theoretical Utility Software) project aims to develop a new theoretical framework within Quantum Chromodynamics (QCD) and Resummed Perturbation Theory. This framework will advance our understanding of particle collider physics, particularly in analysing experiments at the Large Hadron Collider (LHC).

QCD calculations are crucial to LHC results, such as the Higgs boson discovery in 2012. At LHC energies, a perturbative description of strong interactions is valid, and jet observables— like event and jet shapes—are essential for testing QCD. While Fixed Order calculations are accurate for hard radiation, resummed calculations are necessary in regions dominated by multiple soft-collinear emissions. Here, the perturbative expansion struggles due to large logarithms, requiring a systematic approach. Next-to-leading logarithmic (NLL) resummations are available for many observables through the program CAESAR, but next-to-next-to-leading logarithmic (NNLL) resummations, although developed for specific cases, lack a public, automated framework.

This project aims to revolutionize the CAESAR framework, developing the BRUTUS computer program, to fulfil this requirement. BRUTUS will extend prediction to higher accuracy and to non-global jet observables, not described by CAESAR. The recent influx of high-quality data from LHC Run 3 and the upcoming High-Luminosity LHC (HL-LHC) program underscores the need for more accurate theoretical predictions, which will be obtained in a flexible and lightweight way with BRUTUS.

Fields of science (EuroSciVoc)

Keywords

Programme(s)

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Funding Scheme

HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships

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Call for proposal

(opens in new window) HORIZON-MSCA-2025-PF

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Coordinator

THE UNIVERSITY OF SUSSEX
Net EU contribution
€ 260 347,92
Address
SUSSEX HOUSE FALMER
BN1 9RH BRIGHTON
United Kingdom
Region
South East (England) Surrey, East and West Sussex Brighton and Hove
Activity type
Higher or Secondary Education Establishments
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Total cost
No data