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SUMMARY:Spectra–flow correlation as a probe of thermo-geometric fluctuat
 ions in the QGP initial state
DTSTART:20261102T150000Z
DTEND:20261102T160000Z
DTSTAMP:20261104T055500Z
UID:indico-event-1742639@indico.cern.ch
DESCRIPTION:Speakers: Rupam Samanta (Institute of Nuclear Physics (IFJ\, P
 AN)\, Poland)\n\nInitial-state fluctuations in heavy-ion collisions leave 
 imprints on the hadron transverse-momentum spectrum. This was recently sho
 wn at the LHC through v0(pT)\, which correlates the spectra with the event
 -by-event mean transverse momentum [pT]. I will introduce a new observable
 \, v02(pT)\, which correlates the spectra with the squared elliptic flow v
 2^2. As a three-particle correlator\, it is much less sensitive to nonflow
 \, especially at high pT. A principal component analysis of the joint fluc
 tuations of the spectra\, [pT]\, and v2^2 splits the spectral fluctuations
  into a thermal mode and a geometric mode at fixed temperature. I will sho
 w that v0(pT) is solely governed by the thermal mode\, while v02(pT) has a
  sizable geometric contribution that grows in non-central collisions and c
 auses a sign change at low pT. Additionally\, using ideal hydrodynamics fo
 r Pb+Pb collisions at 5.02 TeV\, corrected with the measured v2(pT)\, I wi
 ll present predictions of a decrease of v02(pT) at high pT\, a clear meson
 –baryon splitting\, and a doubly sign-changing proton v02(pT) at low pT 
 in mid-central and peripheral collisions. This makes v02(pT) a clean probe
  of the QGP initial state and motivates its measurement at the LHC.\n\nhtt
 ps://indico.cern.ch/event/1742639/\n\nZoom: https://cern.zoom.us/j/6768831
 6575?pwd=ZkM4ZFdCd2krOWJXeVlPK0p6T2JEQT09
LOCATION:4/2-037 - TH meeting room (CERN)
URL:https://indico.cern.ch/event/1742639/
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