Project description
Calculating soft functions for non-global observables
Non-global observables in Quantum Chromodynamics (QCD) specifically respond to radiation within defined regions of phase space, and their resummation calculations are typically constrained. A framework designed to compute soft functions across a broad spectrum of observables can facilitate the distinction of observable-dependent features from universal structures, thereby enhancing our comprehension of fundamental QCD factorisation properties. The MSCA-funded SoftSERVE-NGL project uses semi-numerical methods to compute next-to-next-to-leading-order (NNLO) soft functions for non-global observables in QCD. Through an analysis of the universal structure of soft and collinear divergences, the project aims to isolate singularities and release a publicly accessible software package for use by phenomenologists. The project's objective is to establish connections among various observable classes and illuminate the characteristics of QCD factorisation.
Objective
"To facilitate the resummation of non-global logarithms and thereby enhancing theoretical predictions for collider phenomenology, I propose a project to calculate NNLO (order alpha_s^2) soft functions for non-global observables in Soft-Collinear Effective Theory (SCET), using semi-numerical methods. The proposed framework consists of two steps: First, the universal structure of soft and collinear divergences in Quantum Chromodynamics (QCD) is analysed to isolate singularities in an observable-independent fashion, after which the remaining phase space integrations are performed numerically. The objectives of the project are the release of a public software package for use by phenomenologists, and the use of the universal divergence structure to relate different classes of observables and shed light on properties of QCD factorisation (with the equivalence of virtuality and rapidity anomalous dimensions as a concrete example).
The project is structured into six work packages: WP1: application to SCET-1 (""energy-type"") observables without clustering effects,
WP2: SCET-1 with clustering effects, WP3: SCET-2 (""transverse momentum-type"") observables, WP4: development of a software
package, and WP5: Exploitation, WP6: communication, dissemination, and training.
The project is inspired by previous efforts directed at the much simpler ""global"" observables. As non-global observables are less investigated yet ubiquitous in collider physics (e.g. jet observables), and resummation calculations for them are only regularly performed in the large Nc limit and at low logarithmic accuracy, a framework to calculate soft functions for wide swathes of observables can be of tremendous service to the community. The systematic separation of observable-dependent features from universal structures can also help shed light on fundamental properties of QCD factorisation, via e.g. an observable-independent analysis of Glauber modes and their impact on factorisation."
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques.
- natural sciencescomputer and information sciencessoftware
- natural sciencesphysical sciencestheoretical physicsparticle physicsparticle accelerator
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Keywords
Programme(s)
- HORIZON.1.2 - Marie Skłodowska-Curie Actions (MSCA) Main Programme
Funding Scheme
HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European FellowshipsCoordinator
1010 Wien
Austria