New Results in HI collisions

New Results in HI

collisions

Alexander Milov

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


RHI

QCD

Di-leptons

Jet quenching

Quarkonia

Correlations

hachoo

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%


log Z

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


RHI

QCD

Di-leptons

Jet quenching

Quarkonia

Correlations


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)

Binary scaling at RHIC.

8

~kind of, but leaving room for doubts


New: data reanalyzed, baseline from new p+p sample, now more convincing

+CuCu (preliminary)


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

W distribution


The two experiments independently: CMS is on the left, on the right is ATLAS

W-mT distribution (CMS)



Z from CMS and ATLAS

12

Zμμ (CMS)

Zee (ATLAS)

Z distributions


ATLAS analysis of 2011 data, ~2000 candidates, 3% purity of Z sample

Binary scaling with Z and W


With high statistical samples, both ATLAS and CMS show that boson production rates are consistent with the binary scaling.

Now I believe in it…

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

Binary scaling works


Ncoll scaling


PHENIX “T-shirt” plot


PHENIX reconstructed jets in CuCu


ALICE to-be “T-short” plot


Why 7 GeV?

Di-jets in progress…


Di-jets modern state


Unbalanced BalancedpT,2/pT,1

PLB 712 (2012) 176

pT,2> 30GeV/c12 > 2/3

Tag-jets with photons


Open/shaded boxes try to indicate possible, anticorrelated systematic variation arXiv:1205.0206, submitted to PLB

Jets are suppressed


Jet Fragmentation


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?


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.

ATLAS: fully corrected RCP


RCP in different pT bins


Same pattern for different jet energies

RCP vs pT and size


Jets with different radii


Different radii show different suppression

Track jet shape with correlations


Track jet shape


Jet shape

modified


?

PHENIX reconstructed jets in dAu


CNM effects

important?


!!!


RHI

QCD

Di-leptons

Jet quenching

Quarkonia

Correlations

Correlations


Already mentioned in the talk

Flow


~400 nucleons

n1 2v cos nn

dN nd

~20000 particles

Flow general


v2/eccentricity grows with participant density

CMS measures high pT flow


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.

2pc deconvolution


Structures like on the left (away from peak) can be described by harmonic flow

v1 flow


Odd component Even component


Harmonicflow

Ridge

EP correlations


Event planes are correlated to each other, and not exactly according to Glauber model prediction


RHI

QCD

Di-leptons

Jet quenching

Quarkonia

Correlations

ATLAS found a new particle in pp


χb ➝ Υ + γ decays PRL108(2012)152001

… and CMS lost one in HI


First measurement of Y(2S)


Comparisons to other experiments


CMSALICE (forw., incl.)STAR

More suppression than at RHIC (STAR), rapidity flipped (PHENIX) but lower pT, more suppression then forward (ALICE)

Not all of them.


Even if I forget something more analyses are coming….


Υ(2S)

Υ(1S) Υ(2S)

J/Ψ

J/Ψforw

J/Ψmidr

J/ΨLHC

J/ΨRHIC

Open charm: suppressed


arXiv:1203.2160

and flows

ATLAS single muons



Open flavor


RHI

QCD

Di-leptons

Jet quenching

Quarkonia

Correlations

LMR exnchancement



PHENIX

STAR


!!!!!!!!

Still worth it

New Results in HI collisions

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