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High energy probes of the initial stages

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

4/3-006 - TH Conference Room

CERN

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Carlos Albert Salgado Lopez (Universidade de Santiago de Compostela (ES)), Joao Lourenco Henriques Barata, Kirill Boguslavski (TU Wien (AT)), Korinna Zapp, Santosh Kumar Das (School of Physical Science, Indian Institute of Technology Goa, India), Urs Wiedemann (CERN)
Description

Jets are one of the key probes of the quark-gluon plasma (QGP) produced in high energy heavy ion collisions at the LHC and RHIC, allowing to build a tomographic picture of the intermediate QCD states. Although the QGP phase dominates most of the evolution of the medium in the aftermath of heavy ion collisions, it is preceded by a short-lived out-of-equilibrium state. This matter state, generated in parallel to the initial jet production, is initially often characterized by strong (classical) fields and undergoes multiple (initial) stages during its equilibration process towards the QGP phase. Understanding this initial stage is of critical importance to characterize the rich many-body properties of QCD. 

The goal of this Theory Institute is to advance our understanding of the early stages of heavy ion collisions using high-energy probes. We aim to: understand which theoretical elements are missing from both sides of the problem and how they can be incorporated in a consistent way, discuss and propose novel jet observables that can be highly sensitive to features of the early stages, while not being much affected by the evolution in the QGP phase, and establish connections to related problems, including small collisional systems, pre-thermalization dynamics in gauge theories, and heavy flavor transport at high momenta. The key questions to be addressed during the Institute are thus summarized as: 

  • How are jets modified during the early stages: virtuality cascade, medium-induced modifications, conceptual and technical challenges.

  • What class of jet (high-pt) observables do we need to explore the early stages?

  • Common aspects with other problems: small systems, thermalization dynamics, polarization effects, and heavy flavors.

 

 

 

 

 

TH workshop secretariat
Participants
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High energy probes of the initial stages
Zoom Meeting ID
68263437643
Host
Elena Gianolio
Passcode
15762607
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Join via phone
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  • Monday 31 March
    • 08:45 → 09:00
      Welcome 15m 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Speaker: Joao Lourenco Henriques Barata
      Recording
      TH_hello.pdf
    • 09:00 → 10:30
      Session: Jets 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Convener: Dr Guilherme Milhano (LIP-Lisbon & CERN TH)
    • 10:30 → 11:00
      Coffee Break 30m 4/2-011 - TH common room

      4/2-011 - TH common room

      CERN

      15
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    • 11:00 → 12:30
      Session: Glasma 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Convener: Dr Guilherme Milhano (LIP-Lisbon & CERN TH)
    • 12:30 → 14:30
      Lunch 2h
    • 14:30 → 16:00
      Session: Kinetic theory 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Convener: Krishna Rajagopal (Massachusetts Inst. of Technology (US))
    • 16:00 → 16:30
      Coffee Break 30m 4/2-011 - TH common room

      4/2-011 - TH common room

      CERN

      15
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    • 16:30 → 17:30
      Discussion: 1. How to integrate initial stages in the studies of hard probes? 2. How to use hard probes measurements to answer important questions about the initial stages? 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Convener: Krishna Rajagopal (Massachusetts Inst. of Technology (US))
      • 16:30
        Discussion 1: Panel discussion 1h
        Recording
  • Tuesday 1 April
    • 09:00 → 10:30
      Session: Initial stages 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Convener: Eero Aleksi Kurkela
    • 10:30 → 11:00
      Coffee Break 30m 4/2-011 - TH common room

      4/2-011 - TH common room

      CERN

      15
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    • 11:00 → 13:00
      Session: Transport, jets 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Convener: Eero Aleksi Kurkela
    • 13:00 → 14:30
      Lunch 1h 30m
    • 14:30 → 16:00
      Session: Glasma, Heavy flavors 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Convener: Joerg Aichelin
      • 14:30
        From momentum broadening in a 2+1D Glasma background towards 3+1D: exploring the dilute approximation and machine learning 45m
        Speaker: Andreas Ipp
        cern2025_ipp.pdf
        Recording
      • 15:15
        Heavy flavor observables as a probe of the Glasma and the early magnetic field 45m
        Speaker: Vincenzo Greco
        Greco-CERN2025.pdf
        Recording
    • 16:00 → 16:30
      Coffee Break 30m 4/2-011 - TH common room

      4/2-011 - TH common room

      CERN

      15
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    • 16:30 → 17:30
      Discussion: What refrains us from interpreting exp. data as "smoking gun" for the proposed processes? 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Convener: Joerg Aichelin
      • 16:30
        Discussion 2: Theory not fully developed? Not sufficient computing power? Difficult way from the glasma to the detector? What do we have to do? 1h
  • Wednesday 2 April
    • 09:00 → 10:30
      Session: Initial stages, holography 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Convener: Marco Ruggieri
    • 10:30 → 11:00
      Coffee Break 30m 4/2-011 - TH common room

      4/2-011 - TH common room

      CERN

      15
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    • 11:00 → 13:00
      Session: Jets 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Convener: Marco Ruggieri
      • 11:00
        EFT approach to jet observables in heavy ion collisions 45m
        Speaker: Dr Yacine Mehtar-Tani (Brookhaven National Laboratory)
        TH-CERN-03-2025.pdf
      • 11:45
        Jet modification in cold and hot QCD medium 45m
        Speaker: Dr Xin-Nian Wang (Lawrence Berkeley National Lab. (US))
        xnwang-CERN.pdf
        xnwang-CERN.pptx
      • 12:30
        Exploring anisotropic QCD matter with jets 30m
        Speaker: João Martins da Silva (LIP - Lisboa / ULisboa - IST)
        JMSilva_CERN2504.pdf
    • 13:00 → 14:00
      Lunch 1h
    • 14:00 → 15:00
      TH Colloquium 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      • 14:00
        High-energy probes of the initial stages in heavy-ion collisions 1h

        The matter produced in heavy-ion collisions undergoes a multiphase evolution, providing unique access to a variety of QCD matter properties. Hard probes, which penetrate the medium and carry away imprints of different phases, serve as a key tool for studying this evolution. While their interaction with the medium in the very first moments after a collision was historically assumed to be negligible, recent studies suggest otherwise. In this talk, I will review how hard probes interact with nuclear matter from the earliest stages of a heavy-ion collision onward. Using jets as an example, I will discuss how they lose energy and how their substructure is modified during the pre-equilibrium phases, comparing these effects with their interactions in the later quark-gluon plasma stage. Understanding these early-time interactions provides new insights into the thermalization process and the microscopic structure of the QCD medium.

        Speaker: Andrey Sadofyev (LIP, Lisbon)
        CERN_HP_IS_final.pptx
        CERN_HP_IS_pdf.pdf
        Recording
        Video preview
    • 15:00 → 15:30
      Coffee Break 30m 4/2-011 - TH common room

      4/2-011 - TH common room

      CERN

      15
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    • 15:30 → 16:30
      Session: Initial stages, hard probes 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      • 15:30
        An EEC Way to Image Elastic Scatterings and Jet Wakes in QGP 15m
        Speaker: Arjun Srinivasan Kudinoor (Massachusetts Institute of Technology)
        ArjunKudinoor_CERN_High_Energy_Probes_2025.pdf
      • 15:45
        Study of Heavy Quark Momentum Broadening in a Non-Abelian Plasma in- and out-of-equilibrium 15m
        Speaker: Harshit Pandey (The Institute of Mathematical Sciences, Chennai, India)
        CERN_HeavyQuark_IS_Harshit_Pandey.pdf
      • 16:00
        Heavy Quark Hadron RAA and v2 in the Hybrid Model with Coalescence 15m
        Speaker: Jean Du Plessis
        JeanCERN2025.pdf
      • 16:15
        Initial stage jet momentum broadening in a Light-Front Hamiltonian approach 15m

        We study the momentum broadening of a high energy quark jet in the high-density gluon medium created right after the collision of two ultrarrelativistic heavy nuclei, the Glasma. Previous Glasma studies consider the jet as a classical probe particle, for which position and momentum are simultaneously determined. In this talk, we use the light-front QCD Hamiltonian formalism to treat the jet as a fully quantum state and compute its real-time evolution while propagating through the Glasma classical background fields, that appear as an interaction potential in the quantum evolution of the jet. We present results for the momentum broadening and jet quenching parameter, $\hat{q}$, experimented by a jet at mid-rapidity, paying special attention to the anisotropies in the momentum broadening between the longitudinal and transverse directions with respect to the collision axis. We enphasize the similarities and differences with the classical calculations that have been carried out so far.

        Speaker: Carlos Lamas (IGFAE-USC)
        Slides_Workshop_CERN_v2.pdf
  • Thursday 3 April
    • 09:00 → 10:30
      Session: Jets experiment 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Convener: Dr Yacine Mehtar-Tani (Brookhaven National Laboratory)
    • 10:30 → 11:00
      Coffee Break 30m 4/2-011 - TH common room

      4/2-011 - TH common room

      CERN

      15
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    • 11:00 → 13:15
      Session: Jets and flow 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Convener: Dr Yacine Mehtar-Tani (Brookhaven National Laboratory)
    • 13:15 → 14:30
      Lunch 1h 15m
    • 14:30 → 16:00
      Session: Heavy flavor experiment, Event generators 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Convener: Liliana Apolinario (LIP (PT))
    • 16:00 → 16:30
      Coffee Break 30m 4/2-011 - TH common room

      4/2-011 - TH common room

      CERN

      15
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    • 16:30 → 17:30
      Discussion: Experimental and phenomenological opportunities 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Convener: Liliana Apolinario (LIP (PT))
      • 16:30
        Discussion 3 1h
  • Friday 4 April
    • 09:00 → 10:30
      Session: Initial stages, EM probes 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Convener: Stanislaw Mrowczynski (National Centre for Nuclear Research, Warsaw, Poland)
      • 09:00
        Understanding chiral plasma instabilities and approach to thermalization in non-Abelian gauge theories 45m
        Speaker: Sayantan Sharma (IMSc)
        ssharma_CERN25.pdf
      • 09:45
        An electromagnetic phenomenology of the early stages 45m
        Speaker: Oscar Garcia-Montero
        EMPhenoES_GarciaMontero.pdf
    • 10:30 → 11:00
      Coffee Break 30m 4/2-011 - TH common room

      4/2-011 - TH common room

      CERN

      15
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    • 11:00 → 13:15
      Session: Hard probes, initial stages 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Convener: Stanislaw Mrowczynski (National Centre for Nuclear Research, Warsaw, Poland)
      • 11:00
        Non-local high- $p_t$ ​ transport in anisotropic QCD matter 45m
        Speaker: Dr Xiaojian Du (Galician Institute of High-Energy Physics (IGFAE))
        CERN-XiaojianDu-Nonlocal.pdf
      • 11:45
        Quark production in the bottom-up thermalization 45m
        Speaker: Sergio Barrera Cabodevila (Instituto Galego de Física de Altas Enerxías - Universidade de Santiago de Compostela)
        SBC-CERN.pdf
      • 12:30
        Leveraging the gluon splitting to heavy quarks for phenomenology 45m
        Speaker: Jasmine Therese Brewer (University of Oxford (GB))
        JasmineBrewer-CERN-TH-Inst.pdf
    • 13:15 → 13:30
      Concluding remarks 15m 4/3-006 - TH Conference Room

      4/3-006 - TH Conference Room

      CERN

      110
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      Speaker: Carlos Albert Salgado Lopez (Universidade de Santiago de Compostela (ES))
      CAS_CERN2025.pdf
    • 13:30 → 15:00
      Lunch 1h 30m
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