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

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 3

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%

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 4

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

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 6

RHI

QCD

Di-leptons

Jet quenching

Quarkonia

Correlations

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)

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)

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

W distribution

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 10

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

W-mT distribution (CMS)

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 11

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012

Z from CMS and ATLAS

12

Zμμ (CMS)

Zee (ATLAS)

Z distributions

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 13

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

Binary scaling with Z and W

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 14

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

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 16

Ncoll scaling

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 17

PHENIX “T-shirt” plot

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 18

PHENIX reconstructed jets in CuCu

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 19

ALICE to-be “T-short” plot

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 20

Why 7 GeV?

Di-jets in progress…

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 21

Di-jets modern state

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 22

Unbalanced BalancedpT,2/pT,1

PLB 712 (2012) 176

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

Tag-jets with photons

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 23

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

Jets are suppressed

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 24

Jet Fragmentation

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 25

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?

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 26

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

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 27

RCP in different pT bins

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 28

Same pattern for different jet energies

RCP vs pT and size

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 29

Jets with different radii

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 30

Different radii show different suppression

Track jet shape with correlations

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 31

Track jet shape

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 32

Jet shape

modified

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 33

?

PHENIX reconstructed jets in dAu

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 34

CNM effects

important?

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 35

!!!

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 36

RHI

QCD

Di-leptons

Jet quenching

Quarkonia

Correlations

Correlations

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 37

Already mentioned in the talk

Flow

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 38

~400 nucleons

n1 2v cos nn

dN nd

~20000 particles

Flow general

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 39

v2/eccentricity grows with participant density

CMS measures high pT flow

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 40

CMS measures high pT flow

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 41

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

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 43

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

v1 flow

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 44

Odd component Even component

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 45

Harmonicflow

Ridge

EP correlations

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 46

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

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 47

RHI

QCD

Di-leptons

Jet quenching

Quarkonia

Correlations

ATLAS found a new particle in pp

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 48

χb ➝ Υ + γ decays PRL108(2012)152001

… and CMS lost one in HI

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 49

First measurement of Y(2S)

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 50

Comparisons to other experiments

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 51

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.

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 52

Even if I forget something more analyses are coming….

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 53

Υ(2S)

Υ(1S) Υ(2S)

J/Ψ

J/Ψforw

J/Ψmidr

J/ΨLHC

J/ΨRHIC

Open charm: suppressed

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 54

arXiv:1203.2160

and flows

ATLAS single muons

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 55

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 56

Open flavor

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 57

RHI

QCD

Di-leptons

Jet quenching

Quarkonia

Correlations

LMR exnchancement

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 58

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 59

PHENIX

STAR

Sasha Milov new in HI QCD @ cosmic E - V, Paris June 12, 2012 60

!!!!!!!!

Still worth it