Quantum Field Theory at the Frontiers of the Strong Interaction

Programme Synopsis

Quantum field theory (QFT) provides a universal language for describing many facets of nature, [and] in particular the Standard Model of particle physics. A key part of this theory is Quantum Chromodynamics (QCD), the SU(3) gauge theory of the strong interactions between quarks and gluons. It describes a plethora of interesting emergent phenomena, and remains the most actively studied QFT. Computations in QCD are difficult: while its coupling constant is small at very high energies, allowing for the perturbative description of hard parton collisions, the theory becomes non-perturbative at low energies, where important phenomena occur, such as the confinement of quarks and gluons into observable hadronic bound states like the proton. One important aspect for studying the frontiers of QFT is to explore the dynamics and rich phenomenology of collisions at a proton-proton collider, like the Large Hadron Collider (LHC), which simultaneously probe over two orders of magnitude in length scales. The interplay of these different length scales is responsible for many important features, such as the formation and the properties of jets, the dependence of observable quantities on the fundamental parameters of the Standard Model, and considerably complicates the task of producing precise theoretical predictions. 

The challenging environment of the LHC has initiated a multitude of theoretical developments in the past years. Factorization allows us to efficiently separate dynamical processes governed by separated energy scales, to define field theory quantities that are universal for different processes and to sum up large logarithmic corrections to all orders. Fixed-order perturbative computations of hard scattering amplitudes have reached the NNLO and beyond precision level and are complemented by insights into the all-order structure of perturbation theory and soft and collinear singularities. Effective field theory methods allow for coherent formulations and development of factorized cross sections at the operator level, and enable the study of the limits of factorization as well as subleading power effects. The conceptual development of Monte Carlo event generators, parton shower algorithms and parton branching methods at the amplitude level and beyond leading order are acquiring increasing importance to reliably model the final states at the LHC. They open up the possibility to connect analytic approaches to resummation and cutting-edge development of event generators. Furthermore, theoretical predictions for many crucial processes measured at the LHC, involving the Higgs boson, heavy quarks, electroweak gauge bosons and possibly New Physics effects are continuously improved, and eventually electroweak and QED corrections have to be accounted for in experimental analyses. Progress on many of these theoretical directions will also have a direct impact on the ongoing experimental collider program. In particular, the forthcoming Run 3 of the LHC will provide a vast amount of data to test new theoretical predictions.

The purpose of the workshop is to bring together internationally recognized experts and young researchers at the interface of QFT and collider physics phenomenology. We like to support exchange and collaboration of groups, working on connected directions but using different approaches, to foster new developments and insights into many interesting questions and to contribute towards new developments.

Weekly focus topics of the Programme

July 31 - August 4: Finite-Mass and Electroweak Effects in Gauge Theories  

The week focuses on extending modern QCD factorization techniques to massive and unstable particles and to account for electroweak and QED corrections using different approaches. 

August 7 - 11: Singularity Structure of Quantum Field Theory Beyond the Leading Power

The week focuses on investigating the structure of quantum field theory in singular limits and to explore new universal structures.

August 14 - 18: Factorization Violation and the Space of Universal Functions

The week focuses on exploring the limits of the factorization paradigm, as well as strengthening the mathematical foundations on which it is based.

August 21 - 25: Simulation of the All Order Structure of Scattering Amplitudes

The week focuses on developing new simulation methods for QCD scattering amplitudes to improve the accuracy of theory predictions and event simulations.

August 28 - September 1: Multi-Variable Techniques for All Order Resummations in QFT

The week focuses on investigating multi-variable techniques as a means to probe the rich nature of jet dynamics.


Code of conduct

We ask all participants to respect our code of conduct.

Topics and Structure of the Workshop

The workshop lasts for 5 weeks and each week roughly focuses on one of five focus topics. The tentative schedule is as follows.

Scheduled presentations and talks

Each Tuesday and Thursday morning there will be presentations 10:00 - 11:00 and 11:30 - 12:30 by invited speakers with a coffee break from 11:00 - 11:30. Black board presentations and room for discussion are encouraged. On Wednesday morning there is the possibility to have max 2 additional talks on the request of participants in coordination with the organizers.

Sharing information

Speakers as well as all other participants of the programme are invited to provide supplementary information intended for all participants using the chat and sharing tool Mattermost. A link to the Mattermost ESI programme page will be provided before the programme starts.

ESI acknowledgement for publications 

The way how you can show your appreciation to the ESI and how the ESI itself shows its impact to the University to acquire its ongoing funding is that you acknowledge the ESI in the publications that emerge during your ESI stay or that were supported by your stay at the ESI in any way. The ESI gathers this information for its yearly report to the University Rectorate, which is important for its continuing funding. We strongly encourage you to add such an acknowledgement to your papers and to let the orgnizers know about it, such that that information can be passed to the ESI staff.

We thank the Erwin-Schrödinger International Institute for Mathematics and Physics at the University of Vienna for partial support during the Programme ``Quantum Field Theory at the Frontiers of the Strong Interactions", July 31 - September 1, 2023.


ESI access outside office hours

The ESI's office hours are between 9:00 and 17:00 each working day, Monday till Friday. The ESI is closed during the weekend (Saturday and Sunday) as well as on Assumption Day (Tuesday, August 15), which is a public holiday. Outside office hours, during the weekend and on holidays you need the magnetic ESI access card to enter the ESI site. You can get an ESI access card from the ESI staff during office hours paying a deposit of 40 Euros, which is returned to you once you give the card back to the ESI staff.

Things to do in Vienna

There are lots of interesting things for you or your family to do in Vienna in summer.  Event, water, mountains, sightseeing, museums, outdoor, indoor, you name it. You can find all information on the internet. Some useful links are collected below. 

What to do in Vienna

Events and opportunities of all kinds


Sporty things

Places to go

Events and music

Things to do

Food places


Aug. 1, 2023
10:00 — 11:00
11:00 — 11:30
Coffee break
11:30 — 12:30
Aug. 3, 2023
10:00 — 11:00
Wouter Waalewijn (U Amsterdam)
Precise predictions for track-based observables
11:00 — 11:30
Coffee break
Aug. 8, 2023
11:00 — 11:30
Coffee break
11:30 — 12:30
Johannes Michel (MIT, Cambridge)
Subleading-Power Soft Subtleties in SIDIS
Aug. 10, 2023
10:00 — 11:00
11:00 — 11:30
Coffee break
11:30 — 12:30
Aug. 14, 2023
10:00 — 11:00
11:00 — 11:30
Coffee break
Aug. 16, 2023
11:30 — 12:30
Hofie Hannesdottir (IAS, Princeton)
Analytic properties of the S-matrix
Aug. 17, 2023
10:00 — 11:00
11:00 — 11:30
Coffee break
11:30 — 12:30
Varun Vaidya (U of South Dakota)
Factorization violation and saturation physics
Aug. 22, 2023
11:00 — 11:30
Coffee break
11:30 — 12:30
Jeffrey Forshaw (U Manchester)
Some aspects concerning Coulomb (Glauber) gluons
Aug. 23, 2023
11:30 — 12:30
Einan Gardi (U Edinburgh)
Regge pole and Regge cuts in full colour
Aug. 24, 2023
10:00 — 11:00
11:00 — 11:30
Coffee break
11:30 — 12:30
Aug. 29, 2023
10:00 — 11:00
Ira Rothstein (Carnegie Mellon U, Pittsburgh)
S Matrix asymptotic from S Matrix Phases
11:00 — 11:30
Coffee break
Aug. 31, 2023
10:00 — 11:00
Ignazio Scimemi (U Complutense de Madrid)
Higher power expansion and jets for tmd
11:00 — 11:30
Coffee break
This event has no subevents associated to it.


Name Affiliation
André H. Hoang University of Vienna
Simon Plätzer University of Graz
Massimiliano Procura University of Vienna
Malin Sjödahl Lund University
Iain Stewart MIT


Name Affiliation
Samuel Alipour-Fard MIT
Thomas Becher University of Bern
Guido Bell University of Siegen
Martin Beneke Technical University of Munich
Miguel Benitez-Rathgeb University of Salamanca
Philipp Böer Johannes-Gutenberg Universität Mainz
Diogo Boito Universidade de São Paulo
Radja Boughezal Argonne National Laboratory
Alejandro Bris Universidad Autonoma de Madrid
Alessandro Broggio University of Vienna
Robin Brüser Albert Ludwigs U Freiburg
Yang-Ting Chien Georgia State University
Marston Copeland Duke University
Tyler Corbett University of Vienna
Simon Dampfhofer University of Graz
Mrinal Dasgupta University of Manchester
Bahman Dehnadi DESY Hamburg
Markus Diehl DESY Hamburg
Gerhard Ecker University of Vienna
Anna Ferdinand MIT
Jeffrey Forshaw University of Manchester
Anjie Gao MIT
Einan Gardi University of Edinburgh
Jonathan Gaunt University of Manchester
Thomas Gehrmann University of Zurich
Aude Gehrmann-De Ridder ETH Zürich
Andrea Ghira Università di Genova & INFN
Marco Guzzi Kennesaw State University
Hofie Hannesdottir Institute for Advanced Study
Reed Hodges Duke University
Max Jaarsma University of Amsterdam
Matthias Jamin Heidelberg University
Sebastian Jaskiewicz Durham University
Elizabeth Jenkins University of California, San Diego
Daekyoung Kang Fudan University
Stefan Keppeler University of Tübingen
Sergio Leal Gomez University of Vienna
Daniel Lechner University of Vienna
Kyle Lee Massachusetts Institute of Technology
Zoltán Ligeti Lawrence Berkeley Lab
Ze Long Liu CERN
Maximilian Löschner DESY Hamburg
Michael Luke University of Toronto
Axel Maas University of Graz
Peter Majcen University of Padua, Padua, Italy
Aneesh Manohar University of California, San Diego
Simone Marzani University of Genova
Vicent Mateu Universidad de Salamanca
Thomas Mehen Duke University
Dmitri Melikhov University of Vienna
Johannes Michel MIT
Sven-Olaf Moch University of Hamburg
Pier Monni CERN
Helmut Neufeld University of Vienna
Aditya Pathak DESY Hamburg
Frank Petriello Northwestern University Evanston
Rudi Rahn The University of Manchester
Sanjay Raman MIT
Anton Rebhan Technical University of Vienna
Christoph Regner University of Vienna
German Rodrigo Consejo Superior de Investigaciones Científicas
Ira Rothstein Carnegie Mellon University
Ines Ruffa University of Vienna
Nicolas Schalch University of Bern
Matthew Schwartz Harvard University
Ignazio Scimemi Universidad Complutense de Madrid
Maximilian Stahlhofen Albert Ludwigs U Freiburg
Julian Strohm Technische Universität München
Zhiquan Sun Massachusetts Institute of Technology
Robert Szafron Brookhaven National Laboratory
Fernando Torre Gonzalez The University of Manchester
Varun Vaidya University of South Dakota
Leonardo Vernazza Istituto Nazionale di Fisica Nucleare, sezione di Torino
Gherardo Vita CERN
Rebecca von Kuk DESY Hamburg
Wouter Waalewijn University of Amsterdam
HuaXing Zhu Peking University
At a glance
Thematic Programme
July 31, 2023 — Sept. 1, 2023
ESI Schrödinger Lecture Hall
André H. Hoang (U of Vienna)
Simon Plätzer (U of Graz)
Massimiliano Procura (U of Vienna)
Malin Sjödahl (Lund U)
Iain Stewart (MIT, Cambridge)