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SUMMARY:Energy-energy correlator of soft sector from small to large system
 s
DTSTART:20260921T140000Z
DTEND:20260921T160000Z
DTSTAMP:20260909T152800Z
UID:indico-event-1721250@indico.cern.ch
DESCRIPTION:Speakers: Yiyang Peng (北京大学理论物理研究所)\n\nW
 e study energy–energy correlators (EEC) of soft hadrons across high-ener
 gy collision systems. These observables can reveal how QCD systems reorgan
 ize\, with increasing size and multiplicity\, from microscopic few-body co
 rrelations to collective many-body dynamics and thermalization. Over the f
 ull angular range\, they are sensitive to both short-range correlations an
 d the global angular structure of bulk energy flow. Here we make a first a
 ttempt to study this change by calculating EEC for different systems and m
 ultiplicity classes\, using viscous hydrodynamics and PYTHIA 8 as two limi
 ting baselines for hydrodynamic evolution and non-hydrodynamic particle pr
 oduction\, respectively. We separate the contribution determined by the me
 an energy flow from the connected component. The hydrodynamic results are 
 dominated by the former and retain sensitivity to geometry and shear visco
 sity. PYTHIA exhibits much stronger connected correlations\, particularly 
 at low multiplicity\; their magnitude falls approximately as the inverse t
 otal soft energy\, although this scaling varies with angle. Together\, the
 se results show how soft-sector EECs can track the changing balance betwee
 n microscopic correlations and collective energy flow as the system grows.
 \n\nhttps://indico.cern.ch/event/1721250/
URL:https://indico.cern.ch/event/1721250/
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