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SUMMARY:Imaging the longitudinal structure of the QGP using different shap
 ed nuclei
DTSTART:20261027T023000Z
DTEND:20261027T033000Z
DTSTAMP:20261027T164500Z
UID:indico-event-31274@indico.ihep.ac.cn
DESCRIPTION:Speakers: Jiangyong Jia (SBU & BNL)\n\nHow energy is deposited
  along the beam direction\, and how it fluctuates\, is the least constrain
 ed part of the initial state of heavy-ion collisions. Accessing this struc
 ture is notoriously difficult because of short-range nonflow correlations\
 , and the traditional observable r2(η) provides only incomplete and biase
 d information about longitudinal decorrelation. Isobar-like collisions hav
 e been used to image the shapes of atomic nuclei\; here we introduce a str
 ategy that turns nuclear shape into a controlled instrument for the longit
 udinal structure of the QGP. A change in nuclear shape perturbs the longit
 udinal geometry while leaving the nonflow background and the final-state r
 esponse essentially unchanged. In AMPT simulations of central U+U and Au+A
 u collisions we extract the full two-particle rapidity correlation map， 
 which reveals a nonlinear\, nonadditive loss of correlation and a previous
 ly unquantified acceptance-dependent bias in standard flow measurements\, 
 about 16% for references four units from mid-rapidity. This idea can be di
 rectly applied to understand longitudinal fluctuations in ellipticity\, tr
 iangularity and transverse size using existing U+U/Au+Au\, Ru+Ru/Zr+Zr and
  O+O/Ne+Ne data. In small systems it can determine whether this bias expla
 ins the long-standing flow puzzle. Nuclear structure thus becomes a precis
 ion instrument for three-dimensional imaging of the QGP initial conditions
 .Bio:Jiangyong Jia is a professor in Stony Brook University (SBU) and phys
 icist in Brookhaven National Laboratory (BNL). He is member of RHIC-STAR a
 nd LHC-ATLAS\, and previously the RHIC-PHENIX experiments\, with broad int
 erests in high energy nuclear physics and particle physics. However\, his 
 main expertise is in the area of collective flow\, hydrodynamics and parti
 cle correlations from small to large collision systems. He received his B.
 S. degree from USTC in 1997\, Ph.D. from SBU in 2003\, worked as a postdoc
  in Columbia University\, before joining the faculty at SBU and BNL in 200
 6.\n\nhttps://indico.ihep.ac.cn/event/31274/
LOCATION:B105 (CHEP)
URL:https://indico.ihep.ac.cn/event/31274/
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