phenix results
DESCRIPTION
PHENIX Results. Y. Akiba (RIKEN Nishina Center) for PHENIX Collaboration RHIC/AGS User’s meeting 2008.05.29. The RHIC Physics Program. New State of Partonic Matter. Origin of Nucleon Spin. RHIC. PHENIX Data-Sets. 30 times. 3 times. - PowerPoint PPT PresentationTRANSCRIPT
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PHENIX Results
Y. Akiba (RIKEN Nishina Center)
for PHENIX Collaboration
RHIC/AGS User’s meeting
2008.05.29
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The RHIC Physics Program
RHIC
New State of Partonic Matter Origin of Nucleon Spin
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PHENIX Data-Sets
Collided 4 different species in 8 years: AuAu, dAu, pp, CuCu6 energies run: 9.2 GeV, 19 GeV, 22.5 GeV, 62.4 GeV, 130 GeV, 200 GeV
3
times
30
times
Year Species Ãs [GeV ] ºLdtNtot (sampled)Data SizeRun1 2000 Au - Au 130 1 µb-1 10 M 3 TB
Au - Au 200 24 µb-1 170 M 10 TBAu - Au 19 < 1 M
p - p 200 0.15 pb-1 3.7 B 20 TBd - Au 200 2.74 nb-1 5.5 B 46 TBp - p 200 0.35 pb-1 6.6 B 35 TB
Au - Au 200 241 µb-1 1.5 B 270 TBAu - Au 62.4 9 µb-1 58 M 10 TBCu - Cu 200 3 nb-1 8.6 B 173 TBCu - Cu 62.4 0.19 nb-1 0.4 B 48 TBCu - Cu 22.4 2.7 µb-1 9 M 1 TB
p - p 200 3.8 pb-1 85 B 262 TBp - p 200 10.7 pb-1 233 B 310 TBp - p 62.4 0.1 pb-1 10 B 25 TB
Run-7 2007 Au - Au 200 725 µb-1 4.6 B 570 TBd - Au 200 81 nb-1 160 B 437 TBp - p 200/500
Au - Au low energy
Run5
Run-6
Run-8
2002/03
2006
2007/08
2005
2001/02Run2
Run3
Run4 2003/04
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PHENIX publications
• 67 papers published since 2001– Phys. Rev. Lett. 41– Phys. Rev. C 19– Phys. Rev. D 5– Phys. Letter B 2– Nucl. Phys. A 1
(white paper)
• Total citation: ~5900– 500+ 1
– 250-500 5– 100-250 11– 50-100 18
• 19 +3 papers published + accepted since January 2007– PRL 9 +1– PRC 7 +2– PRD 2– PLB 1
• 8 papers in review
• PHENIX “White Paper” is now a “Renowed” (500+) status, with total of 504 citation.
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5
Proton Spin
1
2
1
2q Lq
z G Lgz
Well measuredonly ~30% of spin
A future challenge
Spins + orbital angular momentum needto give the observed spin 1/2 of proton
Measuredat RHIC
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π0 ALL : work horse for G(x)
• pQCD works for pT>2GeV/c
RUN5 resutls: PRD76 (2007) 051106
• 0 ALL constraint on G
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RUN6 0 ALL
Scaling Errors not included
• Final RUN6 results will be published soon
• Gives much stronger constraint on G
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More ALL measurements
Many independent probes to understand gluon spin
NEWNEW
NEW
NEW
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Forward 0 AN at large xF with MPC
3.0<<4.0
p+p0+X at s=62.4 GeV p+p0+X at s=62.4 GeV
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AN of muons from charm/bottom decays
• AN of charm decay muons is measured for the first time
“Max” value of AN of charm isnot well constrained
NEW
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3D source imaging
3D source imaging reconstructs source parameters
reverse engineer the correlation function by an input source function.
The analysis suggests that there is a long tail of the source distribution
Solutoin of the long-standing “HBD puzzle”?
arXiv:0712.4372, PRL accepted
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Scaling of v2 of hadrons
• More data on v2(pT) of hadrons are accumulated• When v2/nq vs KET/nq (KET=transverse kinetic enery), all data points
are on a universal curve, suggesting that v2 developed in partonic stage
PRL98,162301(2007)
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Phi meson (small interaction cross section) also followsthe number of quark (nq) scaling.
More on the scaling of v2: phi flow
PRL99, 052301 (2007)
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v2 of Direct photon and J/e+e-
First ever at RHIC,
v2 - J/µ+µ- coming soon
J/Psi coalescence ?
NEW
PHENIX preliminary
Direct v2 Min Bias Au+Au 200 GeV (Run 4)
Sign of direct v2 (at high pT): – Positive == parton emission quenched– Negative == parton emission (Brems.)
enhanced
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v4 - scales with v2
V4
pT (GeV/c)
V4/(nq)2
KET /nq (GeV/c2)KET (GeV/c2)
v2 scales with nq, v4 with nq2 partonic degree of freedom
V4
PHENIX preliminary
NEW
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π0 pT spectra at √sNN = 200 GeV
RUN2 Au+Au PRL91,072301
RUN4 Au+Au arXiv:0801.4020 [nucl-ex]
RAA measurements now extends to 20 GeV/c
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Quantitative analysis
Comparison with GRV model: dNg/dy=1400 arXiv:0801.1665 PRC accepted
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RAA beam energy dependence (Cu+Cu)
Cu+Cu 22,62,200 GeV (Run 5)
• Model calculations indicate quenching expected at sNN = 22 GeV, but Cronin effect dominates
• Species dependence to probe space/time of suppression
arXiv:0801.4555
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19
RAA of hadrons and direct photon (AuAu 200GeV)
• Same suppression pattern for 0 and : Consistent with parton energy loss and fragmentation in the vacuum
• RAA for ‘s larger than 0 RAA for 2 < pT < 5 GeV/c. Why?
• Ncoll scaling for direct (except for highest pT point?– Isospin effect?)
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More Direct photon RAA Results
Central Cu+Cu 200 GeV (Run 5) Direct RAA vs Npart
PHENIX Preliminary
PHENIX PreliminaryMin Bias Au+Au 62 GeV (Run 4)
• Direct photon RAA 1• Is there other evidence for nuclear
effects?– Reduced/enhanced radiation due to jet
quenching
NEW
NEW
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Modification of jet correlation
• Two particle of two high pT track (jet correlation) is modified in central Au+Au collisions.
• Many theory attempts to explain these effect
• Probing the medium response to fast partons
PRL97,052301 (2006) Au+Au
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More detailed study of jet correlation
224
2
/
)(
kurtosis
rms
nn
D
)(
)()(
)(
DG
DGG
J
PRL98, 232302 (2007)
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jet correlations vs reaction plane
unchanged near-side peak in the final jet functions when moving away from Reaction plane, indication for away side modification.
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-h Correlations
“measures” recoil parton momentum– Measure fragmentation function D(Z)
-h p+p 200 GeV (Run 5)
~D(z)
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J/ suppression in Au+Au
• High statistics measurement of J/ in AuAu in wide rapidity range– Mid-rapidty J ee– Forward rapidty J/
• Strong suppression of J/ is observed– Consistent with the
prediction that J/s are destroyed in de-confined matter
• Surprisingly, the suppression is stronger at forward rapidity than in mid-rapidity– J/ formation by
recombination of charm pairs in deconfined matter?
PRL98,172301 (2007)
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RAuAu (run 4) = RAuAu (run 7)
• Forward rapidity only (for now)
• More bins at higher centrality
• Confirm the trend– RAA(y≈1.7) < RAA(y≈0)
NEW
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J/ d+Au: Cold Nuclear Matter
• Increased Run 5 p+p statistics (x10 Run 3) as baseline
• Improved & consistent p+p and dAu analysis– Improved alignment, resolution,
yield extraction,… – Cancellation of systematic errors
in RdAu
• Result: CNM = Shadowing(EKS) + Breakup = 2.8 mb– Consistent within errors with
previous results– and with Breakup=4.2+/-0.5mb
(SPS result)
PRC77_024912 (2008)
+1.7-1.4
J/ RdAu 200 GeV
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J/ RAA Cu+Cu and Au+Au
• Approx 2x more J/ in Cu+Cu sample than Au+Au sample– More precise Npart<100 info
• Curves show RAA prediction from ad hoc CNM fit to RdAu separately at y=0 and y > 1.2
• CNM from RdAu fit describes suppression for Npart < 100.
J/ RAA 200 GeV arXiv:0801.0220
RdAu constraints are not sufficient to say if suppression beyond cold nuclear matter is stronger at forward rapidity
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Heavy flavor electron RAA and flow
Two models describes strong suppression and large v2
Rapp and Van Hee Moore and Teaney
From model comparison, viscosity to entropy ratio /s can be estimated
DHQ × 2πT = 4 - 6DHQ ~ 6 x /(+p) = 6 x /Ts
/s ~ (4/3 – 2)/4 The estimate of /s is close to the conjectured bound 1/4from AdS/CFT
PRL98,172301 (2007)Contraints on /s
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Bottom Measurement
• Charm and bottom spectra both x above FONLL calculations– But ratio is in good agreement with FONLL
p+p 200 GeV Charm and bottom extracted via e-h mass analysis
NEW
NEW
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31
total cross section of charm and bottom
√s dependence of cross section with NLO pQCDagrees with data
total cross section of bottom NEW
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Is bottom also suppressed? Does it flow?
• p+p data indicates that a large contribution of b for pT>2 GeV/c
• The suppression in high pT is strong and new v2 data suggest significant flow of HF electron in high pT
– Is bottom also suppressed?
– Does bottom also flows?
PRELIMINARYRun-4
Run-7
Rapp & van Hees, PRC 71, 034907 (2005)
minimum-bias
PRL 98, 172301 (2007)
e± from heavy flavor
NEW
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e+e- pairs in p+p
• Cocktail filtered in PHENIX acceptance
• Charm, Bottom, DY contributions from PYTHIA
• Excellent agreement!
arXiv:0802.0050
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e+e- pairs in Au+Au
• Data and Cocktail absolutely normalized– Cocktail normalized to
Au+Au measurements• Except ccbar
• Low mass excess– 150 < Mee < 750 MeV– X 3.4±0.2(stat.)
±1.3(syst.)±0.7(model)
arXiv:0706.3034
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PT Dependence of Au+Au Mee
• Low Mass excess is a low pT enhancement– Huge excess at
lowest pT
– Late Phase info
0 < pT < 8 GeV/c 0 < pT < 0.7 GeV/c
0.7 < pT < 1.5 GeV/c 1.5 < pT < 8 GeV/c
PHENIX Preliminary • Still significant at high pT
Next topic
NEW
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Enhancement of almost real photon
Kinematic region of e+e- pairs
m<300 MeV and 1<pT<5 GeV/c
p+p
• Good agreement of p+p data and hadronic decay cocktail
• Small excess in p+p at large mee and high pT
Au+Au
• Clear enhancement visible above for all pT
pp Au+Au (MB)
1 < pT < 2 GeV2 < pT < 3 GeV3 < pT < 4 GeV4 < pT < 5 GeV
arXiv:0804.4168
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Direct for p+p, Au+Au
• New p+p result with * method agrees with NLO pQCD predictions, and with the measurement by the calorimeter
• For Au+Au there is a significant low pT excess above p+p expectations
• Excess is exponential in shape with inverse slope T~ 220MeV
• Thermal photons from hydrodynamical models with Tinit=300 – 600MeV at 0=0.6-0.15fm/c are qualitative agreement with the data.NLO pQCD (W. Vogelsang)
Fit to pp
exp + TAA scaled pparXiv:0804.4168
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Constrain the properties and evolution of the matter
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Summary
• 2007-2008 is very productive for PHENIX
• Spin physics results– Constraint on gluon polarization from pi0 ALL
– More new ALL measurements
– AN of forward pi0, heavy flavor decay muons
• Many heavy ion physics results
3D imaging Flow
High pT hadrons Jet correlation
Direct photon Heavy quark
Dilepton Thermal(?) Photon
• These results start to give constraint on the properties of the dense matter formed at RHIC
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