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Dr. Ruth Britto
Associate Professor, Pure & Applied Mathematics

Biography

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.

Born in Binghamton, New York, she earned degrees in mathematics from MIT and in physics from Harvard, 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 an Associate Professor in Theoretical Physics.

Publications and Further Research Outputs

Peer-Reviewed Publications

Ruth Britto, Generalized Cuts of Feynman Integrals in Parameter Space, Physical Review Letters, 131, (9), 2023 Journal Article, 2023

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, 2022 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, 2022 URL DOI

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, 2022 URL DOI

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, 2022

Ruth Britto, Guy R. Jehu, Andrea Orta, Proving the dimension-shift conjecture, SciPost Physics Proceedings, Radcor and LoopFest 2021, 2021, 202106001, 2021 Conference Paper, 2021 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, 2021 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, 2021 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, 2021 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, 2020 URL

Samuel Abreu, Ruth Britto, Claude Duhr, Einan Gardi, James Matthew, From positive geometries to a coaction on hypergeometric functions, Journal of High Energy Physics, 2020 Journal Article, 2020 DOI TARA - Full Text URL URL

Samuel Abreu, Ruth Britto, Claude Duhr, Einan Gardi, James Matthew, Diagrammatic Coaction of Two-Loop Feynman Integrals, Proceedings of Science, RADCOR 2019, Avignon, 2020 Conference Paper, 2020 URL

Samuel Abreu, Ruth Britto, Claude Duhr, Einan Gardi, James Matthew, Coaction for Feynman integrals and diagrams, Proceedings of Science, Loops and Legs in Quantum Field Theory, St. Goar, 2018 Conference Paper, 2018 URL URL DOI

Samuel Abreu, Ruth Britto, Claude Duhr, Einan Gardi, Cuts from residues: the one-loop case, Journal of High Energy Physics, (1706), 2017, p114- Journal Article, 2017 TARA - Full Text URL URL DOI

Samuel Abreu, Ruth Britto, Claude Duhr, Einan Gardi, Diagrammatic Hopf algebra of cut Feynman integrals: the one-loop case, Journal of High Energy Physics, 1712, 2017, p090- Journal Article, 2017 DOI URL URL

Samuel Abreu, Ruth Britto, Claude Duhr, Einan Gardi, The diagrammatic coaction and the algebraic structure of cut Feynman integrals , Proceedings of Science, RADCOR 2017, St. Gilgen, 2017 Conference Paper, 2017 URL DOI URL

Samuel Abreu, Ruth Britto, Claude Duhr, Einan Gardi, Algebraic structure of cut Feynman integrals and the diagrammatic coaction, Physical Review Letters, 119, (5), 2017, p051601- Journal Article, 2017 DOI URL URL

Britto, Ruth, Ochirov, Alexander, On-shell recursion for massive fermion currents, JHEP, 2013 Journal Article, 2013

Britto, Ruth, Mirabella, Edoardo, External leg corrections in the unitarity method, JHEP, 2012 Journal Article, 2012

Britto, Ruth, Loop Amplitudes in Gauge Theories: Modern Analytic Approaches, J.Phys.A, 2011 Journal Article, 2011

Britto, Ruth, Mirabella, Edoardo, Single Cut Integration, JHEP, 2011 Journal Article, 2011

Britto, Ruth, Feng, Bo, Solving for tadpole coefficients in one-loop amplitudes, Phys.Lett.B, 2009 Journal Article, 2009

Britto, Ruth, Feng, Bo, Yang, Gang, Polynomial Structures in One-Loop Amplitudes, JHEP, 2008 Journal Article, 2008

Britto, Ruth, Feng, Bo, Integral coefficients for one-loop amplitudes, JHEP, 2008 Journal Article, 2008

Britto, Ruth, Feng, Bo, Mastrolia, Pierpaolo, Closed-Form Decomposition of One-Loop Massive Amplitudes, Phys.Rev.D, 2008 Journal Article, 2008

Britto, Ruth, Unitarity cuts for one-loop amplitudes, Nucl.Phys.B Proc.Suppl., 2008 Journal Article, 2008

Anastasiou, Charalampos, Britto, Ruth, Feng, Bo, Kunszt, Zoltan, Mastrolia, Pierpaolo, D-dimensional unitarity cut method, Phys.Lett.B, 2007 Journal Article, 2007

Anastasiou, Charalampos, Britto, Ruth, Feng, Bo, Kunszt, Zoltan, Mastrolia, Pierpaolo, Unitarity cuts and Reduction to master integrals in d dimensions for one-loop amplitudes, JHEP, 2007 Journal Article, 2007

Britto, Ruth, Feng, Bo, Unitarity cuts with massive propagators and algebraic expressions for coefficients, Phys.Rev.D, 2007 Journal Article, 2007

Britto, Ruth, Feng, Bo, Mastrolia, Pierpaolo, The Cut-constructible part of QCD amplitudes, Phys.Rev.D, 2006 Journal Article, 2006

Britto, Ruth, Buchbinder, Evgeny, Cachazo, Freddy, Feng, Bo, One-loop amplitudes of gluons in SQCD, Phys.Rev.D, 2005 Journal Article, 2005

Britto, Ruth, Cachazo, Freddy, Feng, Bo, Witten, Edward, Direct proof of tree-level recursion relation in Yang-Mills theory, Phys.Rev.Lett., 2005 Journal Article, 2005

Britto, Ruth, Feng, Bo, Roiban, Radu, Spradlin, Marcus, Volovich, Anastasia, All split helicity tree-level gluon amplitudes, Phys.Rev.D, 2005 Journal Article, 2005

Britto, Ruth, Cachazo, Freddy, Feng, Bo, Coplanarity in twistor space of N=4 next-to-MHV one-loop amplitude coefficients, Phys.Lett.B, 2005 Journal Article, 2005

Britto, Ruth, Cachazo, Freddy, Feng, Bo, New recursion relations for tree amplitudes of gluons, Nucl.Phys.B, 2005 Journal Article, 2005

Britto, Ruth, Cachazo, Freddy, Feng, Bo, Generalized unitarity and one-loop amplitudes in N=4 super-Yang-Mills, Nucl.Phys.B, 2005 Journal Article, 2005

Britto, Ruth, Cachazo, Freddy, Feng, Bo, Computing one-loop amplitudes from the holomorphic anomaly of unitarity cuts, Phys.Rev.D, 2005 Journal Article, 2005

Britto, Ruth, Feng, Bo, Lunin, Oleg, Rey, Soo-Jong, U(N) instantons on N = 1/2 superspace: Exact solution \& geometry of moduli space, Phys.Rev.D, 2004 Journal Article, 2004

Britto, Ruth, Feng, Bo, Rey, Soo-Jong, Non(anti)commutative superspace, UV / IR mixing and open Wilson lines, JHEP, 2003 Journal Article, 2003

Britto, Ruth, Feng, Bo, N=1/2 Wess-Zumino model is renormalizable, Phys.Rev.Lett., 2003 Journal Article, 2003

Britto, Ruth, Feng, Bo, Rey, Soo-Jong, Deformed superspace, N = 1/2 supersymmetry and nonrenormalization theorems, JHEP, 2003 Journal Article, 2003

Britto-Pacumio, Ruth, Maloney, Alexander, Stern, Mark, Strominger, Andrew, Spinning bound states of two and three black holes, JHEP, 2001 Journal Article, 2001

Britto-Pacumio, Ruth, Strominger, Andrew, Volovich, Anastasia, Two black hole bound states, JHEP, 2001 Journal Article, 2001

Britto-Pacumio, Ruth, Michelson, Jeremy, Strominger, Andrew, Volovich, Anastasia, Lectures on Superconformal Quantum Mechanics and Multi-Black Hole Moduli Spaces, NATO Sci.Ser.C, 2001 Journal Article, 2001

Britto-Pacumio, Ruth, Michelson, Jeremy, Strominger, Andrew, Volovich, Anastasia, Lectures on Superconformal Quantum Mechanics and Multi-Black Hole Moduli Spaces, NATO Sci.Ser.C, 2000 Journal Article, 2000

Britto-Pacumio, Ruth, Strominger, Andrew, Volovich, Anastasia, Holography for coset spaces, JHEP, 1999 Journal Article, 1999

Ruth A. Britto-Pacumio, Limits of iterated H-line graphs, Discrete Mathematics, 199, (1-3), 1999, p1--10 Journal Article, 1999 DOI

Britto-Pacumio, Ruth Alexandra, Bound states of supersymmetric black holes Journal Article,

Research Expertise

Description

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.

Projects

  • Title
    • Loop Amplitudes in Quantum Field Theory
  • 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
  • Date From
    • 2015-10-01
  • Date To
    • 2021-08-31

Keywords

High Energy Physics; Mathematical Physics; Particle physics, fields theory; QUANTUM CHROMODYNAMICS; QUANTUM FIELD-THEORY