Professor Ruth Britto

• 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, DOI , URL , TARA - Full Text
• 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
• 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
• 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, 2017Conference Paper, 2017, DOI , 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, 2018Conference Paper, 2018, DOI , 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, 2020Conference Paper, 2020, URL
• Samuel Abreu, Ruth Britto, Claude Duhr, Einan Gardi, James Matthew, Diagrammatic Coaction of Two-Loop Feynman Integrals, Proceedings of Science, RADCOR 2019, Avignon, 2020Conference 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, 2020Journal Article, 2020, DOI , URL , TARA - Full Text
• 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, 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, Proving the dimension-shift conjecture, SciPost Physics Proceedings, Radcor and LoopFest 2021, 2021, 202106001, 2021Conference Paper, 2021, 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, 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, DOI , URL
• 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, DOI , URL
• Ruth Britto, Generalized Cuts of Feynman Integrals in Parameter Space, Physical Review Letters, 131, (9), 2023Journal Article, 2023
• 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, p443001Journal Article, 2022
• Britto, Ruth, Ochirov, Alexander, On-shell recursion for massive fermion currents, JHEP, 2013Journal Article, 2013
• Britto, Ruth, Mirabella, Edoardo, External leg corrections in the unitarity method, JHEP, 2012Journal Article, 2012
• Britto, Ruth, Loop Amplitudes in Gauge Theories: Modern Analytic Approaches, J.Phys.A, 2011Journal Article, 2011
• Britto, Ruth, Mirabella, Edoardo, Single Cut Integration, JHEP, 2011Journal Article, 2011
• Britto, Ruth, Feng, Bo, Solving for tadpole coefficients in one-loop amplitudes, Phys.Lett.B, 2009Journal Article, 2009
• Britto, Ruth, Feng, Bo, Mastrolia, Pierpaolo, Closed-Form Decomposition of One-Loop Massive Amplitudes, Phys.Rev.D, 2008Journal Article, 2008
• Britto, Ruth, Feng, Bo, Integral coefficients for one-loop amplitudes, JHEP, 2008Journal Article, 2008
• Britto, Ruth, Feng, Bo, Yang, Gang, Polynomial Structures in One-Loop Amplitudes, JHEP, 2008Journal Article, 2008
• Britto, Ruth, Unitarity cuts for one-loop amplitudes, Nucl.Phys.B Proc.Suppl., 2008Journal Article, 2008
• Anastasiou, Charalampos, Britto, Ruth, Feng, Bo, Kunszt, Zoltan, Mastrolia, Pierpaolo, D-dimensional unitarity cut method, Phys.Lett.B, 2007Journal 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, 2007Journal Article, 2007
• Britto, Ruth, Feng, Bo, Unitarity cuts with massive propagators and algebraic expressions for coefficients, Phys.Rev.D, 2007Journal Article, 2007
• Britto, Ruth, Feng, Bo, Mastrolia, Pierpaolo, The Cut-constructible part of QCD amplitudes, Phys.Rev.D, 2006Journal Article, 2006
• Britto, Ruth, Feng, Bo, Roiban, Radu, Spradlin, Marcus, Volovich, Anastasia, All split helicity tree-level gluon amplitudes, Phys.Rev.D, 2005Journal Article, 2005
• Britto, Ruth, Cachazo, Freddy, Feng, Bo, Computing one-loop amplitudes from the holomorphic anomaly of unitarity cuts, Phys.Rev.D, 2005Journal 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, 2005Journal Article, 2005
• Britto, Ruth, Cachazo, Freddy, Feng, Bo, Witten, Edward, Direct proof of tree-level recursion relation in Yang-Mills theory, Phys.Rev.Lett., 2005Journal Article, 2005
• Britto, Ruth, Cachazo, Freddy, Feng, Bo, Generalized unitarity and one-loop amplitudes in N=4 super-Yang-Mills, Nucl.Phys.B, 2005Journal Article, 2005
• Britto, Ruth, Cachazo, Freddy, Feng, Bo, New recursion relations for tree amplitudes of gluons, Nucl.Phys.B, 2005Journal Article, 2005
• Britto, Ruth, Buchbinder, Evgeny, Cachazo, Freddy, Feng, Bo, One-loop amplitudes of gluons in SQCD, Phys.Rev.D, 2005Journal 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, 2004Journal Article, 2004
• Britto, Ruth, Feng, Bo, Rey, Soo-Jong, Deformed superspace, N = 1/2 supersymmetry and nonrenormalization theorems, JHEP, 2003Journal Article, 2003
• Britto, Ruth, Feng, Bo, N=1/2 Wess-Zumino model is renormalizable, Phys.Rev.Lett., 2003Journal Article, 2003
• Britto, Ruth, Feng, Bo, Rey, Soo-Jong, Non(anti)commutative superspace, UV / IR mixing and open Wilson lines, JHEP, 2003Journal Article, 2003
• Britto-Pacumio, Ruth, Michelson, Jeremy, Strominger, Andrew, Volovich, Anastasia, Lectures on Superconformal Quantum Mechanics and Multi-Black Hole Moduli Spaces, NATO Sci.Ser.C, 2001Journal Article, 2001
• Britto-Pacumio, Ruth, Maloney, Alexander, Stern, Mark, Strominger, Andrew, Spinning bound states of two and three black holes, JHEP, 2001Journal Article, 2001
• Britto-Pacumio, Ruth, Strominger, Andrew, Volovich, Anastasia, Two black hole bound states, JHEP, 2001Journal 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, 2000Journal Article, 2000
• Ruth A. Britto-Pacumio, Limits of iterated H-line graphs, Discrete Mathematics, 199, (1-3), 1999, p1--10Journal Article, 1999, DOI
• Britto-Pacumio, Ruth, Strominger, Andrew, Volovich, Anastasia, Holography for coset spaces, JHEP, 1999Journal Article, 1999
• Britto-Pacumio, Ruth Alexandra, Bound states of supersymmetric black holesJournal Article

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.

• 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
• Title

  Mathematics of Scattering Amplitudes
  Summary
  Funding Agency

  European Research Council
  Date From

  01/06/2025
  Date To

  31/05/2031

Classical physics,