New Results in HI collisions
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Transcript of New Results in HI collisions
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New Results in HI
collisions
Alexander Milov
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Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 2
My talk is
biased
I am not talking
about pA
Sorry for missing
references
Miss- interpretation is all my
fault
Sorry for dropping
your best plot
I would not be able to
cover all
Stay tuned!
Plots were formatted to fit my
talk
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Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 3
RHI
QCD
Di-leptons
Jet quenching
Quarkonia
Correlations
hachoo
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Centrality
MB fraction 98 ± 2%
<Npart> <Ncoll>
0-5% 382±0.7% 1683±8%
5-10% 330±1% 1318±8%
10-20% 261±1.5% 923±7%
20-40% 158±2.5% 441±7%
40-80% 46±6% 78±9%
Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 4
log Z
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Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012
2011
Where news are coming from (LHC)
2010
5
Run: 2010 2011Lint 8ub-1 0.15nb-1
Triggers Min Bias γ, μ, jets, Min Bias, UPCNevents (0-80)% 30-40M 750-800M
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RHI
QCD
Di-leptons
Jet quenching
Quarkonia
Correlations
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Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 20127
Nuclear modification factorHow much the Heavy Ion system is different from proton-proton?
Tpp
TAA
collAA dydpNd
dydpNdN
R//1
2
2
Heavy Ions
protonsGeometry
TperiphAA
TcentrAA
centrcoll
periphcoll
CP dydpNddydpNd
N
NR
//
2
2
Heavy Ionscentral
Heavy IonsPeripheral(p+p – like)
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Binary scaling at RHIC.
8
~kind of, but leaving room for doubts
Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012
New: data reanalyzed, baseline from new p+p sample, now more convincing
+CuCu (preliminary)
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Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012
Binary scaling at LHC.
9
arXiv:0397962 [nucl-ex]
ATLAS-CONF-2011-078
PLB697 (2011) 294-312
CMS
ATLAS
PLB697 (2011) 294-312
All hints in one direction, but uncertainties are large
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W distribution
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The two experiments independently: CMS is on the left, on the right is ATLAS
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W-mT distribution (CMS)
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Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012
Z from CMS and ATLAS
12
Zμμ (CMS)
Zee (ATLAS)
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Z distributions
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ATLAS analysis of 2011 data, ~2000 candidates, 3% purity of Z sample
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Binary scaling with Z and W
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With high statistical samples, both ATLAS and CMS show that boson production rates are consistent with the binary scaling.
Now I believe in it…
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What about photons
Reference: JETPHOX 1.3 ET(R=0.3)<0.6 GeVSasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 15
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Binary scaling works
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Ncoll scaling
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PHENIX “T-shirt” plot
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PHENIX reconstructed jets in CuCu
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ALICE to-be “T-short” plot
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Why 7 GeV?
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Di-jets in progress…
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Di-jets modern state
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Unbalanced BalancedpT,2/pT,1
PLB 712 (2012) 176
pT,2> 30GeV/c12 > 2/3
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Tag-jets with photons
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Open/shaded boxes try to indicate possible, anticorrelated systematic variation arXiv:1205.0206, submitted to PLB
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Jets are suppressed
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Jet Fragmentation
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arXiv:1205.5872
PbPb PbPb
= log (1/z)
Leading and sub-leading jets in PbPb fragment like jets of corresponding energy in pp collisions
So, where the energy is?
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Where is the jet energy?in cone
out of cone
(0-30)%
Inside the cone high pT tracks are unbalanced (AJ > 0).Outside the cone low track are unbalanced with an opposite sign.Summing up the two restores the balance.
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ATLAS: fully corrected RCP
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RCP in different pT bins
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Same pattern for different jet energies
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RCP vs pT and size
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Jets with different radii
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Different radii show different suppression
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Track jet shape with correlations
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Track jet shape
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Jet shape
modified
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?
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PHENIX reconstructed jets in dAu
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CNM effects
important?
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!!!
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RHI
QCD
Di-leptons
Jet quenching
Quarkonia
Correlations
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Correlations
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Already mentioned in the talk
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Flow
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~400 nucleons
n1 2v cos nn
dN nd
~20000 particles
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Flow general
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v2/eccentricity grows with participant density
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CMS measures high pT flow
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CMS measures high pT flow
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Higher order harmonic flow
Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 42http://arxiv.org/abs/1203.3087
Harmonic flow up to 6th order.
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2pc deconvolution
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Structures like on the left (away from peak) can be described by harmonic flow
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v1 flow
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Odd component Even component
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Harmonicflow
Ridge
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EP correlations
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Event planes are correlated to each other, and not exactly according to Glauber model prediction
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RHI
QCD
Di-leptons
Jet quenching
Quarkonia
Correlations
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ATLAS found a new particle in pp
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χb ➝ Υ + γ decays PRL108(2012)152001
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… and CMS lost one in HI
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First measurement of Y(2S)
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Comparisons to other experiments
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CMSALICE (forw., incl.)STAR
More suppression than at RHIC (STAR), rapidity flipped (PHENIX) but lower pT, more suppression then forward (ALICE)
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Not all of them.
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Even if I forget something more analyses are coming….
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Υ(2S)
Υ(1S) Υ(2S)
J/Ψ
J/Ψforw
J/Ψmidr
J/ΨLHC
J/ΨRHIC
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Open charm: suppressed
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arXiv:1203.2160
and flows
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ATLAS single muons
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Open flavor
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RHI
QCD
Di-leptons
Jet quenching
Quarkonia
Correlations
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LMR exnchancement
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PHENIX
STAR
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!!!!!!!!
Still worth it