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2009 RHIC

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9/23/09. 2009 RHIC & AGS Annual Users' Meeting. Friday Plenary Session. 1 ... Black: lab frame 3-particle. cummulant. 3 pTTrig 4 GeV/c. 1 pTAssoc 2GeV/c. 9/23/09. 12 ... – PowerPoint PPT presentation

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Title: 2009 RHIC


1
Jet Medium Interactions in STAR Cone, Ridge and
high pT RAA
  • Pawan Kumar Netrakanti
  • Purdue University
  • (For STAR Collaboration)

2
Outline
  • Single particle spectra
  • Identified particle spectra at high pT in pp
  • Nuclear Modification Factor
  • Color charge effect
  • Jet flavor conversion
  • Away-side correlations
  • Reaction plane dependence
  • Conical Emission
  • Mach Cone
  • theory/model inputs
  • Near-side correlations
  • Ridge
  • Correlation asymmetry Correlated Emission Model
    (CEM)
  • 3-particle ??-?? correlations
  • Summary

3
Motivation High pT spectra
Nuclear Modification Factor Color charge
dependence ?RAA(?) gt RAA(p) Jet Flavor
Conversion In medium parton
interaction
Applicability of NLO pQCD calculation to pp
collisions.
arXiv 0804.4760
0
Ks
QM08
W. Liu, R.J. Fries, Phys. Rev. C77 (2008) 054902
With increased RHIC luminosities and efficient
trigger system, STAR can pursue all these physics
programs very well.
4
Identified particle spectra in pp
Extend particle identification by relativistic
rise in dE/dx from TPC (pT15 GeV/c). An
independent way to reconstruct Ks0???- from
BEMC.
Xu Y. QM09
AuAu
STAR preliminary
pp
MinBias pp data Phys. Lett. B. 637 (2006) 161
Consistent with the results from NLO
calculations. STAR data will provide a better
constraint on fragmentation function
5
Nuclear modification factor (RAA)
0-12 AuAu 200 GeV
  • RAA(p) gt RAA(?)
  • In contrast with energy loss
  • by color charge effect.
  • RAA(K) 0.4 at pTgt5.0 GeV/c
  • ? Kaon results are consistent
  • with jet flavor conversion.
  • RAA(?) RAA(?0) at pT gt 5 GeV/c

Xu Y. QM09
6
RAA vs. system size
0
Integrated RAA (pTgt5.5 GeV/c) For all
centralities RAA(K) gt RAA(?)
Ks
STAR preliminary
Is the centrality dependence consistent with jet
flavor conversion? May be higher pT measurements
needed present data dominated by recombination
region.
?
Timmins A. QM09
7
Motivation Away-side correlations
  • 2-particle high pT correlations (w.r.t RP)
  • ? path-length dependent jet quenching.

PRL 93 (2004) 252301
4ltpTTriglt6 GeV/c 2ltpTAssocltpTTrig GeV/c
?s ?trig-?RP
STAR PRL 95 152301 Ulery QM05
3-particle ??-?? correlations Explain away-side
double hump structure. ?Conical emission
Mach-cone shock wave Cerenkov gluon
radiation Large angle gluon radiation
Defected jets
pTTriggt4 GeV/c 0.15ltpTAssoclt4 GeV/c
I.M. Dremin (Nucl. Phys. A750 233, 2006) V. Koch
et. al. (Phys. ReV. Lett. 96, 172302, 2006)
H. Stöcker et al. (Nucl.Phys.A750121,2005) J.
Casalderrey-Solana et. al. (Nucl.Phys.A774577,200
6) T. Renk J. Ruppert (Phys.Rev.C73011901,(2006
))
8
Away-side correlations
AuAu collisions 3ltpTTriglt4 GeV/c 1.0ltpTAssoclt1.5
GeV/c
Di-hadron correlations w.r.t. reaction plane
?s ?trig-?RP
dAu
AuAu
STAR Preliminary
20-60
STAR Preliminary
top 5
Feng A. JPG35104082,2008
  • In 20-60, away-side evolves from single-peak
    (?S 0o) to double-peak (?S90o).
  • In top 5, double peak show up at a smaller ?S.
  • At large ?S, little difference between two
    centrality bins.

9
Azimuthal 3-particle correlations
??
??
10
Different systems different centralities
3ltpTTriglt4 GeV/c 1ltpTAssoclt2GeV/c
dAu
pp
AuAu 80-50
AuAu 50-30
AuAu 0-12
AuAu 30-10
Phys. Rev. Lett. 102 (2009) 52302
11
Projections and Angle
3ltpTTriglt4 GeV/c 1ltpTAssoclt2GeV/c
dAu
AuAu 0-12
12 AuAu shows significant Peaks in off-diagonal
projections at 1.37?0.02(stat.) 0.06
(sys.) radians. Black lab frame 3-particle
cummulant.
-0.07
Phys. Rev. Lett. 102 (2009) 52302
No significant pT dependence of observed emission
angle. Consistent with Mach-cone Inconsistent
with simple Cerenkov radiation
12
Motivation Near-side correlations
STAR Preliminary
STAR Preliminary
AuAu 0-12
dAu
pTTrig gt 4 GeV/c 2ltpTAssocltpTTrig GeV/c
Near-side ridge in central AuAu collisions.
Properties similar to bulk Extends even upto
higher rapidities. Long range
correlations. Can 3-particle correlation in
??-?? give more information about the ridge?
QM09
13
Ridge yield in-plane ? out-of-plane
Analyze trigger particles at different sides
separately.
Prediction Asymmetric peaks
14
Jet and Ridge yields
Flash Talk Konzer J. QM09
  • Jet Y(??lt0.7) AcceptanceY(??gt0.7).
  • ??gt0.7 ridge away-side. Two-Gaussian fit to
    away-side and subtract ? Ridge

??gt0.7
3ltpTTriglt4 GeV/c
AuAu 20-60
1ltpTAssoclt1.5 GeV/c
?S0
?S90
STAR Preliminary
?f fassoc-fTrig
?S0
?S90
STAR Preliminary
Ridge
Jet
?f fassoc-fTrig
Ridge is asymmetric in ??
15
Correlation Asymmetry
Flash Talk Konzer J. QM09
??
Shaded Sys. Errors.
  • Jet is symmetric.
  • Ridge is asymmetric !
  • Ridge asymmetry consistent with CEM -
  • ridge may be due to jet-flow alignment.

Asymmetry
Chiu Hwa, Lindenbaum Longacre, Voloshin,
Shuryak, McLerran ,Venugopalan Gavin
et.al Takahashi et. al.
16
Ridge 3-particle ??-?? correlations
T Trigger particle A1 First Associated
particle A2 Second Associated particle
Select associated particle in the near-side
region ??lt0.7. STAR TPC acceptance
for 3-particle correlation in ? (?lt1 and full
azimuth)
Dh1 A1-T Dh2 A2-T
3ltpTtriglt10 GeV/c, ?lt1 1lt pTassoclt3 GeV/c,
?lt1
Like (T,A) (T- A-) Unlike (T- A)
(T A-)
??lt0.7 ? N(Unlike) gt N(Like) ??gt0.7 ?
N(Unlike) N(Like)
STAR Preliminary
Using charge combinations among 3-particles, we
can separate Jet and Ridge.
17
3-particle ??-?? correlations
Netrakanti P.K. QM09
3ltpTtriglt10 GeV/c 1ltpTassoclt3 GeV/c ,
??lt0.7
dAu
AuAu 12
Charge independent (AAT) ?
AALike (AALikeTLike AALikeTUnlike) (TAA
T-A-A-) (T-AA TA-A-) ?
STAR Preliminary
AAUnlike (AAT - AALike) (TA-A, TAA-,
T-AA-, T-A-A) ?
Ridge in all charge combinations in AuAu.
18
Radial projection for correlations
Netrakanti P.K. QM09
AAT
STAR Preliminary
3ltpTtriglt10 GeV/c 1ltpTassoclt3 GeV/c
??lt0.7
STAR Preliminary
AALikeTLike
AAUnlike
AALikeTUnlike
19
Jet and Ridge separation
Netrakanti P.K. QM09
Ridge (T- A) A) Ridge (T A) A) Ridge
(T A- ) A-) Ridge (T- A- ) A-)
STAR Preliminary
Ridge(AALikeTUnlike) Ridge(AALikeTLike)
AALikeTLike No Jet, only Ridge AALike Jet
Ridge
AALike TAA,T-A-A-, T-AA
,TA-A- AAUnlike TA-A,TAA- T-A-A ,T-AA-
STAR Preliminary
3x
20
3-particle ??-?? Jet and Ridge
Jet 3(AALikeTUnlike - AALikeTLike) Ridge
AAT - Jet
Radial Projection
Angular Projection
STAR Preliminary
STAR Preliminary
?(Jet) 0.25 ? 0.09 ?(Ridge) 1.53 ?
0.41
Ridge is wide. No prominent substructures in
ridge.
21
Summary
  • Single particle spectra
  • Identified hadron spectra extended up to 15
    GeV/c in pp.
  • Better constraints for fragmentation function
  • Nuclear Modification factor
  • RAA(p) gt RAA(?) ? contrast with energy loss by
    color charge effect
  • Jet flavor conversion consistent with the kaon
    data.
  • Away-side correlations
  • Reaction plane dependence of away-side
    correlation
  • In mid-central ?single peak (?S0o) to double
    peak(?S 90o).
  • path-length dependence of jet quenching.
  • Evidence of conical emission
  • Correlated hadrons observed at an angle of 1.37
    radians
  • pT independence of the angle suggests Mach-cone
    emission
  • Near-Side Correlations
  • Reaction plane dependence of near-side
    correlations.
  • Jet is symmetric. Ridge is asymmetric.
  • 3-particle ??-?? correlations
  • Jet and Ridge are separated by charge
    dependence.
  • Jet is narrow. Ridge is wide in ?.

Thank You
22
Back up
23
Particle identification at STAR
Charged Hadrons
Neutral hadrons
arXivnucl-ex/0505026v2
Extend particle identification by relativistic
rise in dE/dx from TPC (pT15 GeV/c).
An independent way to reconstruct K0S???-
Xu Y. QM09
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