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Light ion collisions at the LHC - 2025
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6/2-024 - BE Auditorium Meyrin (CERN)
Aleksas Mazeliauskas
(Heidelberg University (DE)),
Georgios Krintiras
(The University of Kansas (US)),
Giuliano Giacalone,
Wilke Van Der Schee
(CERN)
Description
We are pleased to announce the 2025 edition of the Light Ion Collisions at the LHC workshop.
The workshop aims to bring the community together for celebrating and assessing the scientific reach of experimental results on light-ion collisions collected at the LHC in July 2025.
The goal is to clarify what we have learned from existing measurements and to define the most pressing open questions going forward. We will also hold a community discussion on the scientific potential of future light-ion runs in 2026 and beyond.
Workshop topics include:
- Experimental overviews of collectivity and energy loss
- Hydrodynamics and non-equilibrium dynamics
- Jet quenching in small systems
- nPDFs of light ions
- Synergies with nuclear structure physics and other areas
- Accelerator and experiments perspectives for future light-ion runs
Anyone interested in the workshop is invited to register.
The organizers,
- Reyes Alemany Fernandez (CERN)
- Giuliano Giacalone (CERN)
- Qipeng Hu (USTC Hefei)
- Gian Michele Innocenti (MIT)
- Georgios Krintiras (University of Kansas)
- Saverio Mariani (CERN)
- Aleksas Mazeliauskas (ITP Heidelberg)
- Dennis Perepelitsa (CU Boulder)
- Anthony Timmins (University of Houston)
- Wilke van der Schee (CERN)
- Urs Wiedemann (CERN)
- You Zhou (NBI Copenhagen)
TH workshop secretariat
Participants
232
View full list
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1
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Machine and experimental soft-probes reports 6/2-024 - BE Auditorium MeyrinConvener: You Zhou (Niels Bohr Institute (DK))
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2
Overview of performance of the 2025 oxygen and neon runSpeaker: Theodoros Argyropoulos (CERN)
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3
ALICE overview softSpeaker: Emil Gorm Nielsen (University of Copenhagen (DK))
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4
ATLAS overview softSpeaker: Blair Daniel Seidlitz (Columbia University (US))
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5
CMS overview softSpeaker: Aryaa Dattamunsi (Indian Institute of Technology Madras (IN))
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6
LHCb overview softSpeaker: Zhengchen Lian (Tsinghua University (CN))
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7
STAR overview softSpeaker: Prof. Chunjian Zhang (Fudan University (CN))
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2
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10:40 AM
Coffee break 6/2-024 - BE Auditorium Meyrin
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Soft Physics in Light-Ion Collisions 6/2-024 - BE Auditorium Meyrin
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8
Predictions for light-ionsSpeaker: Wenbin Zhao (Peking University)
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9
Predictions for light-ionsSpeaker: Dr Wilke Van Der Schee (CERN)
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10
Longitudinal structure of light-ion collisionsSpeaker: Andreas Kirchner
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11
Light-ions with McDipper initial conditionsSpeaker: Oscar Garcia-Montero (Universität Bielefeld)
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12
Flow in light ion collisions from kinetic theory and inferences on hydrodynamisationSpeaker: Clemens Werthmann (Ghent University)
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8
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12:15 PM
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Soft Physics in Light-Ion Collisions 6/2-024 - BE Auditorium Meyrin
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13
Collective Dynamics and Opacity Estimation in OO Collision Systems via CoMBolt-ITASpeaker: Seyed Farid Taghavi (Technische Universitaet Muenchen (DE))
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14
Causality Constraints to Multi-Particle Cumulants: Testing Different System Sizes at the LHCSpeaker: Isabella Danhoni
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16
Discussion: Do we understand collectivity in small systems?Speakers: Oscar Garcia-Montero (Universität Bielefeld), Raimond Snellings (Nikhef National institute for subatomic physics (NL)), Sunil Jaiswal
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13
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3:30 PM
Coffee break 6/2-024 - BE Auditorium Meyrin
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Nuclear structure 6/2-024 - BE Auditorium Meyrin
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17
Toward lattice simulations of strongly-correlated nuclear systems with high-fidelity chiral interactionsSpeaker: Dean Lee
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18
Visualizing nuclear correlations: ab initio shapes of nuclei and application to 22NeSpeaker: Benjamin Bally (TU Darmstadt)
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19
The shape of 20Ne from low energy nuclear physics measurementsSpeaker: Nico Orce
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20
Discussion: Imaging nuclei in high-energy collisions
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17
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6:00 PM
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1
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Hard Probes and nPDFs in Light-Ion Collisions I 6/2-024 - BE Auditorium MeyrinConvener: Dennis Perepelitsa (University of Colorado Boulder)
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21
Status and perspectives of nPDFs for light-ionsSpeaker: Petja Kalle Matias Paakkinen
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22
Nuclear PDFs from the nCTEQ25 global analysis and potential impact of light ion collisions at the LHCSpeaker: Katrin Greve
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23
No-quenching baseline computations for light-ion collisionsSpeaker: Jannis Gebhard (Heidelberg University)
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24
ALICE overview hard probesSpeaker: Florian Jonas (CERN)
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21
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10:05 AM
Coffee break 6/2-024 - BE Auditorium Meyrin
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Hard Probes and nPDFs in Light-Ion Collisions II 6/2-024 - BE Auditorium MeyrinConvener: Dennis Perepelitsa (University of Colorado Boulder)
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25
ATLAS overview hard probesSpeaker: Anne Marie Sickles (Univ. Illinois at Urbana Champaign (US))
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26
CMS overview hard probesSpeaker: Cristian Baldenegro (Massachusetts Inst. of Technology (US))
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27
STAR / sPHENIX overview hard probesSpeaker: Sijie Zhang
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25
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Topical discussions 6/2-024 - BE Auditorium MeyrinConvener: Anthony Robert Timmins (University of Houston (US))
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28
Discussion: Centrality determination in light ions
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28
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11:50 AM
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Energy loss in light ion collisions 6/2-024 - BE Auditorium Meyrin
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29
Light-Ion Suppression from pQCD Energy Loss with Small-System CorrectionsSpeaker: Cole Faraday
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30
Energy loss predictions in the color-coherence frameworkSpeaker: Adam Takacs (Heidelberg University)
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31
Leveraging light-ion collisions to eke out the path-length dependence of energy-lossSpeaker: Isobel Kolbé (University of the Witwatersrand (ZA))
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32
Jet quenching and medium response for OO collisions in the hybrid modelSpeaker: Arjun Srinivasan Kudinoor (Massachusetts Institute of Technology)
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33
Early Colour-Coherence Effects in Jet QuenchingSpeaker: Liliana Apolinario (LIP (PT))
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34
Path length dependence of radiative energy lossSpeaker: Francois Arleo (Subatech, Nantes)
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29
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3:00 PM
Coffee break 6/2-024 - BE Auditorium Meyrin
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Energy loss in light ion collisions 6/2-024 - BE Auditorium Meyrin
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35
Discussion: What have we learnt about hard probes by varying the system size?Speakers: Carlota Andres (CPHT, Ecole polytechnique), Dennis Perepelitsa (University of Colorado Boulder), William Horowitz (University of Cape Town), Yen-Jie Lee (Massachusetts Inst. of Technology (US))
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35
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SMOG2 & cosmic rays 6/2-024 - BE Auditorium Meyrin
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36
Perspectives and opportunities for SMOG2Speaker: Chiara Lucarelli (CERN)
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37
Report from LHCf and cosmic showersSpeaker: Eugenio Berti (Universita e INFN, Firenze (IT))
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38
Expected impacts of light-ion collisions on models of cosmic showersSpeaker: Felix Riehn (Technische Universitaet Dortmund (DE))
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36
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7:00 PM
Workshop dinner Café de Mategnin
Café de Mategnin
https://maps.app.goo.gl/ZVMBVZru5purpiGTAFondue dinner; route: https://maps.app.goo.gl/ZVMBVZru5purpiGTA
Please register and pay on indico
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Machine Performance and Science Cases for Future Ion Runs 6/2-024 - BE Auditorium MeyrinConvener: Anthony Robert Timmins (University of Houston (US))
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39
Overview of the planned R&D of future ions post-LS3 in the injector chainSpeaker: Maciej Slupecki (CERN)
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40
Charting the Luminosity Capabilities of the CERN Large Hadron Collider with Various Nuclear SpeciesSpeaker: Dr Roderik Bruce (CERN)
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41
Beam transmutation in light-ion collisionsSpeaker: John Jowett (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))
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42
The case of Nuclear Matrix Elements of 0νββ decaySpeaker: Giuliano Giacalone
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39
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10:10 AM
Coffee break 6/2-024 - BE Auditorium Meyrin
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Discussion on the 2026 Ion Run and Beyond 6/2-024 - BE Auditorium MeyrinConvener: Dr Georgios Krintiras (The University of Kansas (US))
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43
LHC performance in 2025 & what comes nextSpeakers: Chiara Zampolli (CERN), Christopher Young (CERN)
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44
Light ions with ALICE 3Speaker: David Dobrigkeit Chinellato (Austrian Academy of Sciences (AT))
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45
Looking for the path towards saturation at the LHCSpeaker: Christophe Royon (The University of Kansas (US))
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46
Discussion
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43
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12:00 PM
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47
TH Colloqium: Light-Ion Collisions - Bridging Small and Large QCD Systems 4/3-006 - TH Conference Room
The first oxygen–oxygen and neon–neon collisions at the LHC this July have opened a new frontier in exploring hot and dense QCD matter. These light-ion systems bridge the gap between proton–proton and heavy-ion collisions. Over the past decade, experiments have revealed intriguing but sometimes puzzling results: signals of elliptic flow appear even in proton–proton collisions, whereas clear signs of jet quenching remain absent in small systems. The recent pO, OO, and NeNe runs enable precision tests of heavy-ion models in intermediate-size systems. Light-ion collisions probe the critical regime where nuclear structure, perturbative QCD, and quark–gluon plasma physics intersect. I will discuss what the first light-ion data reveal about the structure of the colliding nuclei, the applicability of hydrodynamics, and the onset of partonic energy loss in small systems.
Speaker: Aleksas Mazeliauskas
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