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Hot Jets: Advancing the Understanding of High Temperature QCD with Jets

8–10 Jan 2025
Loomis Lab (UIUC)
America/Chicago timezone

Contribution List

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  1. 14. Response of Jets to Collective Flow in Heavy-Ion Collisions
    Matthew Sievert (New Mexico State University)
    08/01/2025, 09:00

    The highly-successful program of jet quenching in heavy-ion collisions relies upon a separation of energy scales between the jet $p_T$ and the medium. At leading power in this high-$p_T$ ``eikonal'' expansion, scattering in the medium leads to isotropic transverse momentum broadening and radiative energy loss, but the medium is approximately static in this limit. When extended to incorporate...

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  2. 6. Quantifying jet quenching and medium response with two particle correlations with PHENIX
    Anthony Hodges (Univ. Illinois at Urbana Champaign (US))
    08/01/2025, 09:30

    As energetic patrons produced in heavy-ion collisions traverse the quark-gluon plasma, they lose energy before fragmenting into a jet of particles such that the observed jet is modified compared to jets produced in p+p collisions. In heavy-ion collisions, the number of jets observed is suppressed and the distribution of particles or energy within the jet is modified compared to expectations...

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  3. 29. Asymmetric jet shape due to jet-flow interaction
    Dr Xin-Nian Wang (Lawrence Berkeley National Lab. (US))
    08/01/2025, 10:30
  4. 27. High pT jets in a charged, viscous medium
    Isaac Long
    08/01/2025, 11:00
  5. 9. ML biases in background subtraction to measure jet quenching
    David Stewart (Wayne State University)
    08/01/2025, 11:30

    Jet quenching measurements in central ultra-relativistic heavy ions collisions are a principle experimental probe of the quark-gluon plasma (QGP). The measurement resolution is limited, particularly at lower values of transverse momentum, by the high density of background particles. Many recent studies have demonstrated that neural networks (NNs) trained on jet substructure are capable of...

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  6. 18. Investigation of medium effects on energy-energy correlation (EEC) in jets within the CoLBT-hydro model.
    Zhong Yang (Vanderbilt University)
    08/01/2025, 13:30

    Energy-energy correlators(EECs) has recently emerged as an excellent jet substructure to study space-time information of parton shower. We explore the EECs within $\gamma$-jets using our LBT and CoLBT-hydro frameworks. We investigate the effects of jet quenching, medium-induced gluon radiation, and medium response on EECs in AA collisions compared to pp collisions. Additionally, we find that...

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  7. 19. Exploring QCD dynamics with charm-tagged jet substructure studies with ALICE
    Preeti Dhankher (University of California Berkeley (US))
    08/01/2025, 14:00

    Jet substructure provides precise tests of Quantum Chromodynamics (QCD) and offers a distinct way to study hadronization mechanisms, compared to measurements of hadrons alone. QCD predicts that jet radiation patterns depend on the mass and color charge of the initiating parton. Parton showers, in particular, are sensitive to the Casimir factors of quarks and gluons, as well as the parton mass,...

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  8. 7. Multipoint Energy Correlators in Heavy Ion Collisions at RHIC Energies from Simulation
    Benjamin Kimelman (Vanderbilt University)
    08/01/2025, 14:30

    Energy-energy correlators and their three point counterpart have recently been of great interest to the heavy ion jet community as they directly provide the virtuality scale and are relatively simple to calculate. Recent measurements of the two point correlator in PbPb collisions compared to pp collisions by CMS show interesting trends, even when accounting for the energy loss causing a shift...

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  9. 10. An EEC Way to See the Interplay Between Elastic Scatterings and Jet Wakes
    Arjun Srinivasan Kudinoor (Massachusetts Institute of Technology)
    08/01/2025, 15:30

    Quark gluon plasma (QGP), when viewed at length scales of order the inverse of its temperature, behaves as a strongly coupled liquid. However, when it is probed at shorter length scales or with sufficiently high momentum transfer, asymptotic freedom mandates the presence of quark-like and gluon-like quasi-particles. High energy partons within jets can trigger these high-momentum exchanges,...

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  10. 30. Undergraduate presentations
    08/01/2025, 16:00
  11. 35. Discussion
    08/01/2025, 16:45
  12. 2. Relativistic (a)causality in hydrodynamics and its effect on Bayesian analyses
    Prof. Matthew William Luzum (University of São Paulo)
    09/01/2025, 09:00

    Relativistic fluid dynamics remains the backbone of modern simulations, which affects both bulk properties and rare probes such as jets. However, there have long been questions about whether it is being used outside its regime of validity in modern simulations. An important new tool for answering this question is a causality analysis -- if the evolution equations do not respect relativistic...

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  13. 5. Jet measurements at STAR
    Isaac Mooney
    09/01/2025, 09:30

    TBD

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  14. 12. Flow Effects on Charged Hadron $R_{AA}$ and $v_n$ in Heavy Ion Collisions
    Joseph Bahder
    09/01/2025, 10:30

    We discuss the flow-induced anisotropic contribution to jet-broadening, "jet drift", showing that this effect results in a deflection of hard partons, and thus jets, in the direction of the medium flow. Next, we study this effect in both toy models and a full-fledged hybrid transport simulation of $\sqrt{s}$ = 5.02 TeV PbPb collisions at the LHC, tracking trajectories of hard partons with...

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  15. 15. Jet Drift in Heavy Ion Collisions: Acoplanarity and $v_{2}$
    Mr Hasan Rahman (New Mexico State University)
    09/01/2025, 11:00

    We introduce a sub-eikonal anisotropic contribution to jet-broadening, "jet drift," that couples to the flow of the nuclear medium, showing that this effect results in a deflection of hard partons, and thus jets, in the direction of the medium flow. We study Two-jet observables i.e. $v_{2}$ and acoplanarity for $\sqrt{s} = $ 5.02 TeV PbPb collisions at the LHC. We show that jet drift leads to...

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  16. 4. High-$p_T$ physics in the inaugural sPHENIX physics Run-24
    Tanner Mengel (University of Tennessee)
    09/01/2025, 11:30

    The new sPHENIX experiment at the Relativistic Heavy Ion Collider (RHIC) has recently finished in its inaugural physics run with proton-proton and gold-gold collisions in 2024. sPHENIX is a large acceptance and high rate experiment, equipped with hermetic electromagnetic and hadronic calorimeter systems, the latter of which is unique at RHIC. The calorimeters, along with an efficient trigger...

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  17. 26. Factorized approach for jet production and substructure observables in HICs
    Dr Balbeer Singh (University of South Dakota)
    09/01/2025, 14:00
  18. 20. Jets in ATLAS
    Riccardo Longo (Univ. Illinois at Urbana Champaign (US))
    09/01/2025, 14:30
  19. 28. Including a source term in hydrodynamic simulations
    Kevin Pala
    09/01/2025, 15:30
  20. 32. Jet Substructure at LHCb
    Dillon Fitzgerald (University of Michigan (US))
    09/01/2025, 16:00

    The Large Hadron Collider beauty (LHCb) experiment allows for the exploration of jet substructure in novel ways. It is a fully instrumented spectrometer in the forward region, permitting increased sensitivity for heavy flavor hadron production as well as jets initiated by a light quark produced in association with a Z0 boson. This allows for an analysis of the mass and flavor dependence of jet...

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  21. 31. Discussion
    09/01/2025, 16:30
  22. 13. Recent multiplicity-based measurements in jet physics
    Zoltan Varga (Yale University)
    10/01/2025, 09:00

    Observables based on multiplicity play a crucial role in jet measurements. An influential contribution to the analysis of event multiplicity distributions is the Koba-Nielsen-Olesen (KNO) scaling hypothesis, which states that the multiplicity distributions can all be collapsed onto a universal scaling curve. Phenomenological studies based on proton–proton collisions have found a similar...

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  23. 21. Jets in pp in ALICE
    Debjani Banerjee (Univ. Illinois at Urbana Champaign (US))
    10/01/2025, 09:30
  24. 34. First D0-tagged jet axes difference measurement in pp collisions at 5.02 TeV with ALICE
    Emma Rose Yeats (University of California Berkeley (US))
    10/01/2025, 10:30

    Substructure measurements of jets containing heavy-flavor hadrons play an important role in testing pQCD calculations in proton-proton (pp) collisions and are critical tools for studying the quark-gluon plasma (QGP) created in heavy-ion collisions. We study three different D0-tagged jet axis definitions with varying degrees of sensitivity to wide-angle radiation: Standard, Soft Drop groomed...

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  25. 25. Searching for Jet Quenching in High-Multiplicity Proton-Lead Collisions at LHC
    Dener De Souza Lemos (University of Illinois at Chicago (US))
    10/01/2025, 11:00
  26. 16. Probing jet hadrochemistry with measurements of $\pi$, K, and p in jets and the underlying event in Pb--Pb collisions at $\sqrt{s_{\rm{NN}}} = 5.02$ TeV with ALICE
    Sierra Cantway (Yale University (US))
    10/01/2025, 11:30

    Measurements of jet substructure observables in heavy-ion collisions can constrain how energetic partons interact with the medium. Though there has been remarkable progress in particle-species-inclusive jet substructure measurements, a complete understanding of the identified particle composition of the jet and its modification in heavy-ion collisions remains elusive. Jet quenching models...

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  27. 11. Investigating jet modification in absence of QGP-medium
    Prottoy Das (University of Illinois at Chicago (US))
    10/01/2025, 13:30

    We explore modification of jet properties in high-multiplicity proton-proton (pp) collisions at $\sqrt{s} = 13$ TeV, utilizing the PYTHIA 8 Monash 2013 Monte Carlo simulation. While the formation of a quark-gluon plasma (QGP) is typically associated with jet quenching, our investigation focuses on jet modifications arising purely from non-QGP mechanisms, including color reconnection (CR) and...

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  28. 23. Calibrated (3+1)D hydrodynamic medium for ultrarelativistic collision physics
    Andi Mankolli (Vanderbilt University (US))
    10/01/2025, 14:00
  29. 36. Machine Learning Application in Jet Quenching Analysis
    Yilun Wu (Vanderbilt University)
    10/01/2025, 14:20
  30. 33. Discussion & Wrap-up
    10/01/2025, 14:40
  31. 8. Medium modification calculations of collinear drop observables
    Dr Yang-Ting Chien (Georgia State University)

    Collinear drop observables suppress energetic, collinear contributions and enhance the sensitivities to soft radiation where medium modifications are most significant. While the Lund plane contains comprehensive information about radiation, collinear drop observables can be concretely designed to probe specific regions of phase space which qualitative features of medium modifications may...

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  32. 22. TBD
    Preeti Dhankher (University of California Berkeley (US))
  33. 24. TBD
    Zhong Yang (Vanderbilt University)