First Lund Jet Plane Institute

4/3-006 - TH Conference Room (CERN)

4/3-006 - TH Conference Room


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Gregory Soyez (IPhT, CEA Saclay)

Jet substructure techniques are now routinely used in collider phenomenology. This specialised workshop evolves around a recent tool called the Lund Jet Plane(s). The main idea is to use the Cambridge/Aachen clustering technique (i.e. a roughly angular-ordered clustering tree) to associate a kinematic structure, akin to the Lund planes used in resummations and in Monte Carlo generators, to a high-energy jet. This structure can then be used in a wide range of applications. The goal of this workshop is to provide a theoretical and experimental overview of these applications and their connections with other tools in the field. A special emphasis will be put on recent developments and on discussions of future potential directions. This includes the following list of topics:

  • Constraints on Monte Carlo generators from Lund plane density measurements
  • Tagging of light-quarks vs. gluon
  • Boosted V/H/t vs. QCD jets discrimination
  • Mass effects in the Lund plane (dead cone, heavy flavor tagging)
  • Applications to BSM searches
  • Studies of the quark-gluon-plasma in heavy-ion collisions
  • Jet substructure measurements (generalised angularities, groomed observables,..)
  • Machine learning tools (e.g., LundNet, ParticleNet, GNN)
  • Lund-plane observables to constrain parton showers with N^kLL resummation
  • Strategies to mitigate quark/gluon fraction issues.
  • Possible αs extractions with jet substructure.

The workshop will consist of afternoon talks. One of the key aspect of the workshop will be to leave time for common discussions and work between theorists and experimentalists.   

Organising committee:

  • Cristian Baldenegro (LLR, co-chair)
  • David d’Enterria (CERN, co-chair)
  • Raghav Kunnawalkam Elayavalli (Vanderbilt)
  • Matt LeBlanc (CERN)
  • Simone Marzani (Università di Genova)
  • Matt Nguyen (LLR)
  • Jennifer Roloff (BNL)
  • Alba Soto Ontoso (CERN, co-chair)
  • Gregory Soyez (IPhT Saclay, CERN, co-chair)
  • Marta Verweij (Utrecht)


First Lund Jet Plane Institute
Zoom Meeting ID
Elena Gianolio
Alternative hosts
Gregory Soyez, Alba Soto Ontoso, Pascal Pignereau
Useful links
Join via phone
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Application Form
  • Adam Takacs
  • Alba Soto Ontoso
  • Alberto Rescia
  • Alexander Nesterenko
  • Alexander Yohei Huss
  • Alexandre Shabetai
  • Ali Al Kadhim
  • Aman Desai
  • Andrea Pareti
  • Armando Bermudez Martinez
  • Austin Baty
  • Ben Nachman
  • Bibhuti Parida
  • Bogdan Malaescu
  • Cameron Ikin
  • Christine Aidala
  • Cristian Baldenegro Barrera
  • David d'Enterria
  • Deniz Sunar Cerci
  • Donatella Lucchesi
  • Eduardo Ploerer
  • Emily Ann Smith
  • Francesco Giuli
  • Giulia Manco
  • Gregory Soyez
  • Grigorios Chachamis
  • Guilherme Milhano
  • Haddad Abdelhamid
  • Haoyu Sun
  • Ina Sarcevic
  • Jasmine Brewer
  • Jay Jiwani
  • Joey Huston
  • João Silva
  • Kadri Özdemir
  • Konrad Tywoniuk
  • Lata Panwar
  • Leo Tarbouriech
  • Leticia Cunqueiro Mendez
  • Mario Campanelli
  • Marta Verweij
  • Matt LeBlanc
  • Matthew Nguyen
  • Monika Robotkova
  • Mrinal Dasgupta
  • Muhammad Muhammad
  • Nima Zardoshti
  • Oldrich Kepka
  • Patricia Rebello Teles
  • Peter Skands
  • Pier Francesco Monni
  • Prasoon Chakraborty
  • Rachik Soualah
  • Rafael Andrei Vinasco Soler
  • Raghav Kunnawalkam Elayavalli
  • Rajeev Singh
  • Raymond Ehlers
  • Robert Les
  • Roy Lemmon
  • safa gaid
  • Salim Cerci
  • Samuel Abreu
  • Sanmay Ganguly
  • Silvia Ferrario Ravasio
  • Simon Williams
  • Simone Caletti
  • Simone Marzani
  • Subash Chandra Behera
  • Tim Cohen
  • Tommaso Cresta
  • Toni Mlinarevic
  • Valdis Slokenbergs
  • Vit Kucera
  • Vitalii Okorokov
  • Yi Chen
  • +15
TH workshop secretariat or workshop organisers
    • 2:00 PM 2:15 PM
      Introduction 15m
      Speakers: David d'Enterria (CERN), Gregory Soyez (IPhT, CEA Saclay)
    • 2:15 PM 3:00 PM
      A history of Lund diagrams and resummations 45m
      Speaker: Prof. Andrea Banfi (University of Sussex)
    • 3:00 PM 4:30 PM
      Coffee break 1h 30m
    • 4:30 PM 5:00 PM
      Counting jets in the Lund Plane 30m
      Speaker: Alba Soto Ontoso (CERN)
    • 5:00 PM 5:30 PM
      Jets and Lund plane studies at LHCb 30m
      Speaker: Christine Aidala (University of Michigan (US))
    • 5:30 PM 6:00 PM
      Measurements of the Lund jet plane and its properties (ATLAS) 30m
      Speaker: Emily Ann Smith (University of Chicago (US))
    • 2:00 PM 2:30 PM
      The Lund plane as a way to constrain the quark-gluon plasma 30m
      Speaker: Konrad Tywoniuk (University of Bergen (NO))
    • 2:30 PM 3:00 PM
      Studying jet shower modifications in the quark-gluon plasma using the Lund tree (CMS) 30m
      Speaker: Ms Yi Chen (Massachusetts Inst. of Technology (US))
    • 3:00 PM 3:30 PM
      Coffee break 30m
    • 3:30 PM 4:00 PM
      Jet substructure measurements probing the Lund radiation plane in pp and Pb-Pb collisions (ALICE) 30m
      Speaker: Raymond Ehlers (University of California Berkeley (US))
    • 4:00 PM 4:30 PM
      Tracing heavy quark trajectories in pp and Pb-Pb collisions, including future challenges and opportunities (ALICE) 30m
      Speaker: Nima Zardoshti (CERN)
    • 4:30 PM 5:00 PM
      Dead-cone searches in heavy-ion collisions using the jet tree 30m
      Speaker: Leticia Cunqueiro Mendez (Roma Sapienza University)
    • 5:00 PM 6:00 PM
      Discussion 1h
    • 2:00 PM 3:00 PM
      Theory Colloquium

      This is the weekly CERN TH colloquium:

    • 3:00 PM 3:30 PM
      Coffee break 30m
    • 3:30 PM 4:00 PM
      Collider events on a quantum computer 30m
      Speaker: Simon Williams (Imperial College London)
    • 4:00 PM 4:30 PM
      Jet substructure using the Lund tree in 13 TeV pp collisions (CMS) 30m
      Speaker: Cristian Baldenegro Barrera (Laboratoire Leprince-Ringuet)
    • 4:30 PM 5:00 PM
      Exploiting the Lund plane to study jet splitting kinematics at RHIC energies (STAR) 30m
      Speaker: Monika Robotková (Nuclear Physics Institute, Czech Academy of Sciences)
    • 5:00 PM 5:30 PM
      Lund planes for parton-shower development 30m
      Speaker: Mrinal Dasgupta (Unknown)
    • 5:30 PM 6:00 PM
      Discussion 30m
    • 11:00 AM 12:00 PM
      Collider X-Talk: the primary Lund Plane density

      The talk is part of the Collider X-Talk series.
      Note: this will be held in the TH Common room (4/2-011)

    • 12:00 PM 1:30 PM
      Lunch 1h 30m
    • 1:30 PM 2:30 PM
      BSM Forum: Dark showers and the Lund Plane

      The talk is part of the CERN TH BSM Forum series.

      Convener: Tim Cohen (CERN)
    • 2:30 PM 3:00 PM
      Jet substructure at RHIC as a roadmap towards the EIC 30m
      Speaker: Raghav Kunnawalkam Elayavalli (Vanderbilt University)
    • 3:00 PM 3:30 PM
      Coffee break 30m
    • 3:30 PM 4:00 PM
      Tagging using Lund plane variables 30m
      Speaker: Charanjit Kaur Khosa
    • 4:00 PM 4:30 PM
      Jet tagging with the Lund jet plane (ATLAS) 30m
      Speaker: Jad Mathieu Sardain (University of Arizona (US))
    • 4:30 PM 5:30 PM
      Discussion 1h
    • 2:00 PM 2:30 PM
      Breaking the q/g degeneracy in extractions of the strong coupling from jet substructure 30m
      Speaker: Matt LeBlanc (University of Manchester (GB))
    • 2:30 PM 3:00 PM
      Quark/gluon tagging using Lund Plane information 30m
      Speaker: Gregory Soyez (IPhT, CEA Saclay)
    • 3:00 PM 3:30 PM
      Coffee break 30m
    • 3:30 PM 3:40 PM
      Closing 10m
      Speakers: Alba Soto Ontoso (CERN), Cristian Baldenegro Barrera (Laboratoire Leprince-Ringuet), Gregory Soyez (IPhT, CEA Saclay)