QGP liquid rather than gas

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Extraction of Jet Topology Using Three Particle
Correlations
N. N. Ajitanand for the
Collaboration
2nd International Conference on Hard and
Electromagnetic Probes of High-Energy Nuclear
Collisions, June 9 16, 2006
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High Energy Density matter produced in 200 GeV
Au Au
The matter is strongly Coupled hydro-like
Reasonable to expect strong jet modification by
such a medium
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Possible Modifications of Jet Topology
Flow induced deflection
hep-ph/0411341 Armesto,Salgado,Wiedemann

• nucl-th/0406018 Stoecker
• Hep-ph/0503158 Muller,Ruppert

Mach Cone Formation
J. Casalderrey-Solana, E.V. Shuryak, and D.
Teaney, arXiv hep-ph/0411315 (2004)
Cherenkov Cone Formation
A. Majumdar HP2006
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Three particle correlations used to extract jet
topology

• Total Correlation Real Triplets / Fake
  Triplets
• Real Triplets Combinations of three particles
  in same event
• Fake Triplets Combinations of three particles
  each from different event
• Harmonic Correlations constructed using particles
  emitted with harmonic correlation with respect to
  Reaction Plane
• Jet Correlation Total Correlation
  a0(Harmonic Correlation)
• ao is adjusted till Jet Correlation surface
  goes to zero at its minimum (ZYAM Ajitanand
  et.al. Phys. Rev. C 72, 011902 (2005) )

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PHENIX acceptance limits angles between
correlated triplets
H
Small angles
etalt0.35 phi_arm90
Medium angles
Necessary to do Sim study of jet models to get a
feel for expected correlation shapes
Large angles
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Schematic Jet Shapes Studied by SIMs
Normal Jet
Deflected Jet
Cone Jet
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Correlations Constructed in high pt Frame
High pT (2.5ltpTlt4) p1
Associated pTs (1ltpTlt2.5)
p2-a
p3-a
Correlation Variables
The high pT frame is the intuitive choice for the
study of jet topology
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PHENIX SIM
Normal Jets in zero-flow background
Standard 2-Particle Correlation
3-Particle Correlation Polar plot along radius
along azimuth
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PHENIX SIM
Abnormal Jets in zero flow background
3-Particle Correlations
2-particle Correlations made to be similar
Cone
excess
Deflected
3p correlations different even if 2p
correlations are similar
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PHENIX SIM
Abnormal Jets in flowing background
Harmonic removed by ZYAM method
Full Correlation
Cone
Cone
Deflected
Deflected
ZYAM gives good Jet Recovery
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PHENIX SIM
Normal Jets in zero flow background
soft-soft soft-hard processes only
all processes
Cone
Excess due to hard-soft-soft correlations
Deflected
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Data
PHENIX Preliminary
Indications of abnormal jets
0-5
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Data
3-particle Full Correlation Function
PHENIX Preliminary
PHENIX Acceptance
Jet landscape giving way to flow
5-10
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Data
PHENIX Preliminary
3-particle Full Correlation Function
PHENIX Acceptance
Flow Dominated
10-20
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Data
PHENIX Preliminary
3-particle Full Correlation Function
PHENIX Acceptance
Flow Dominated
20-40
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Data
PHENIX Preliminary
3-particle Full Correlation Function
PHENIX Acceptance
Flow Dominated
40-60
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Data
PHENIX Preliminary
3-particle Full Correlation Function
PHENIX Acceptance
Normal jet dominated
60-90
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PHENIX Preliminary
Data
PHENIX Acceptance
Indication of abnormal jets without harmonic
removal
Centrality Evolution of Full Correlation
Function along for 110
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Data
PHENIX Preliminary
Strong away side modification seen
20-40
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Conclusions

• The high pt frame is a suitable choice for the
  study of jet topology via three particle
  correlations
• Polar plots of three particle correlations
  obtained for 200 GeV AuAu
• Correlation for most central case shows abnormal
  topology even without harmonic removal
• Harmonic subtracted correlation function for
  mid-central shows strong away side modification
• Differentiation of deflection and cone topology
  will be evaluated after accounting for soft-soft
  and hard-soft contributions
• Method may be a potential tool for jet study at
  LHC
• Method could be useful for mid-forward eta
  correlation studies
• (F. Wang HP2006)