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Professor Ruth Britto

Professor In (Pure & Applied Mathematics)
18 WESTLAND ROW
      
Profile Photo

Professor Ruth Britto

Professor In (Pure & Applied Mathematics)
18 WESTLAND ROW

 brittor@tcd.ie

 3531896 3945


Ruth Britto is a theoretical physicist studying fundamental interactions. She is best known for her work on scattering amplitudes, which are mathematical functions characterizing the production of elementary particles, for example in high-energy collider experiments designed for discovering and analyzing new particles and new physical behaviours. She is currently probing deep mathematical structure in these functions, with the aim of offering powerful computational algorithms and revealing unknown principles of quantum field theory. She earned degrees in mathematics from MIT and in physics from Harvard University, and held research positions at the Institute for Advanced Study, the University of Amsterdam, Fermi National Accelerator Laboratory, and the Commissariat à l'énérgie atomique before coming to Trinity College Dublin in 2014, where she is a Professor in Theoretical Physics.
  High Energy Physics   Mathematical Physics   Particle physics, fields theory   QUANTUM CHROMODYNAMICS   QUANTUM FIELD-THEORY
Project Title
 Loop Amplitudes in Quantum Field Theory
From
2015-10-01
To
2021-08-31
Summary
The traditional formulation of relativistic quantum theory is ill-equipped to handle the range of difficult computations needed to describe particle collisions at the Large Hadron Collider (LHC) within a suitable time frame. Yet, recent work shows that probability amplitudes in quantum gauge field theories, such as those describing the Standard Model and its extensions, take surprisingly simple forms. The simplicity indicates deep structure in gauge theory that has already led to dramatic computational improvements, but remains to be fully understood. For precision calculations and investigations of the deep structure of gauge theory, a comprehensive method for computing multi-loop amplitudes systematically and efficiently must be found. The goal of this proposal is to construct a new and complete approach to computing amplitudes from a detailed understanding of their singularities, based on prior successes of so-called on-shell methods combined with the latest developments in the mathematics of Feynman integrals. Scattering processes relevant to the LHC and to formal investigations of quantum field theory will be computed within the new framework.
Funding Agency
European Research Council
Programme
Horizon2020
Project Type
Consolidator Grant
Project Title
 Mathematics of Scattering Amplitudes
From
01/06/2025
To
31/05/2031
Summary
Funding Agency
European Research Council

Ruth Britto, Generalized Cuts of Feynman Integrals in Parameter Space, Physical Review Letters, 131, (9), 2023, Journal Article, PUBLISHED
Gardi, Einan and Abreu, Samuel and Britto, Ruth and Duhr, Claude and Matthew, James, The diagrammatic coaction, Proceedings of Science, 16th DESY Workshop on Elementary Particle Physics: Loops and Legs in Quantum Field Theory 2022 (LL2022), Ettal, Germany, LL2022, 2022, pp015-, Conference Paper, PUBLISHED  DOI  URL
Ruth Britto, Riccardo Gonzo, Guy R. Jehu, Graviton particle statistics and coherent states from classical scattering amplitudes, Journal of High Energy Physics, 03, 2022, p214-, Journal Article, PUBLISHED  URL
Abreu, Samuel and Britto, Ruth and Duhr, Claude, The SAGEX review on scattering amplitudes Chapter 3: Mathematical structures in Feynman integrals, Journal of Physics A, 55, (44), 2022, p443004-, Journal Article, PUBLISHED  DOI  URL
Gabriele Travaglini, Andreas Brandhuber, Patrick Dorey, Tristan McLoughlin, Samuel Abreu, Zvi Bern, N Emil J Bjerrum-Bohr, Johannes Blümlein, Ruth Britto, John Joseph M Carrasco, Dmitry Chicherin, Marco Chiodaroli, Poul H Damgaard, Vittorio Del Duca, Lance J Dixon, Daniele Dorigoni, Claude Duhr, Yvonne Geyer, Michael B Green, Enrico Herrmann, Paul Heslop, Henrik Johansson, Gregory P Korchemsky, David A Kosower, Lionel Mason, Ricardo Monteiro, Donal O"Connell, Georgios Papathanasiou, Ludovic Planté, Jan Plefka, Andrea Puhm, Ana-Maria Raclariu, Radu Roiban, Carsten Schneider, Jaroslav Trnka, Pierre Vanhove, Congkao Wen, Chris D White, The SAGEX review on scattering amplitudes*, Journal of Physics A: Mathematical and Theoretical, 55, (44), 2022, p443001 , Journal Article, PUBLISHED
Ruth Britto, Guy R. Jehu, Andrea Orta, Proving the dimension-shift conjecture, SciPost Physics Proceedings, Radcor and LoopFest 2021, 2021, 202106001, 2021, Conference Paper, PUBLISHED  URL
Ruth Britto, Guy R. Jehu, Andrea Orta, The dimension-shift conjecture for one-loop amplitudes, Journal of High Energy Physics, 04, 2021, p276-, Journal Article, PUBLISHED  URL
Ruth Britto, Sebastian Mizera, Carlos Rodriguez, Oliver Schlotterer, Coaction and double-copy properties of configuration-space integrals at genus zero, Journal of High Energy Physics, 05, 2021, p053-, Journal Article, PUBLISHED  URL
Samuel Abreu, Ruth Britto, Claude Duhr, Einan Gardi, James Matthew, The diagrammatic coaction beyond one loop, Journal of High Energy Physics, 10, 2021, p131-, Journal Article, PUBLISHED  URL
Samuel Abreu, Ruth Britto, Claude Duhr, James Matthew, Einan Gardi, Generalized hypergeometric functions and intersection theory for Feynman integrals, Proceedings of Science, RADCOR 2019, Avignon, 2020, Conference Paper, PUBLISHED  URL
  

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Scattering amplitudes play a key role in high-energy physics. Not only do they describe the actual scattering taking place in collider experiments--of current importance in the era of the Large Hadron Collider (LHC)--but they also illuminate the formal aspects of quantum field theories, such as divergent behavior or integrability. Amplitudes are thus useful both practically and formally, but their availability is limited by the difficulty of computing them. As the number of particles in the scattering process increases, or the perturbative expansion is carried out to higher order, the traditional technique of Feynman rules fails to be feasibly implementable. This difficulty has prompted the innovation of new techniques. Notable among these are on-shell techniques, in which the basic building blocks are complete amplitudes, rather than fundamental interactions. The on-shell framework has surpassed traditional Feynman diagram expansions, both in delivering new results and in expressing them in formulas that are not only compact, but also deeply illuminating. My research develops the on-shell framework to incorporate all theories and configurations of physical interest, building upon recent developments in pure mathematics.