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Collective phenomena in jets: a new window into the ultimate quark-gluon droplet

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WH11NE(Sunrise)

WH11NE(Sunrise)
LPC Topic Of The Week 2025
Zoom Meeting ID
65029048274
Description
Please login if you have a cern account or email lpc-tw@fnal.gov to obtain the password to this meeting
Host
Ka Hei Martin Kwok
Alternative hosts
Keith Ulmer, Luigi Marchese, Marguerite Belt Tonjes, Gabriele Benelli
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Zoom URL
    • 15:00 → 16:00
      Collective phenomena in jets: a new window into the ultimate quark-gluon droplet 1h

      High-energy heavy-ion collisions produce a deconfined Quark-Gluon Plasma (QGP), which exhibits remarkable collective behavior as a nearly "perfect" fluid. Surprisingly, similar signatures of collectivity have emerged in small systems such as proton-proton (pp) and proton-nucleus (pA) collisions, challenging conventional wisdom on the minimum system size required for emergent QCD phenomena. In this talk, I will introduce a novel perspective: collective behavior may manifest even within individual high-energy jets—localized partonic cascades resulting from hard scatterings. Using new results from the CMS experiment at the LHC, I will discuss evidence that high-multiplicity jets can exhibit features reminiscent of QGP-like collectivity, potentially revealing new aspects of nonperturbative QCD at the smallest accessible scales. I will further explore how these findings connect to jet substructure studies, particularly in understanding parton shower evolution, hadronization, and the role of the QCD vacuum in shaping final-state interactions. These insights open an intriguing new direction in the search for the ultimate limit of partonic collectivity and the fundamental nature of QCD in extreme conditions.

      Speaker: Wei Li (Rice University (US))
      FNAL_ToW_WeiLi_v1.pdf
      TOTW_Mar18_WeiLi.mp4