ALICE Pb-Pb and p-Pb results
ALICE soft physics summary
Dariusz Miskowiec, GSI / EMMI Darmstadt
!
!
!
!
!
!
bulk particle production
spatial extension
collective flow
probing
matter
 QCD
bulk
particle production
unexplained
ridges in p-A
  spatial
extension
three questions and answers
  collective flow
  probing QCD matter
  unexplained ridges in p-A
  three questions and answers
1
ALICE
in 2011: 60%
in 2011: 60%
Detector:
Size: 16 x 26 meters
Weight: 10,000 tons
Collaboration:
> 1000 Members
> 100 Institutes
2
> 30 countries
ALICE measurements
pp
0.9, 2.36, 2.76, 7.0, 8.0 TeV
3 years*
Pb-Pb
2.76 TeV
8 weeks
p-Pb
5.02 TeV
8 hours**
* at reduced luminosity
** longer run starting next week
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
3
arxiv
system
energy (TeV)
observable
published in
1
0911.5430
pp
0.9
charged particle dN/deta
EPJ C65 (2010) 111
2
1004.3034
pp
0.9, 2.36
charged particle dN/deta, mult. distr.
EPJC 68(2010)89
3
1004.3514
pp
7.0
same
EPJC 68(2010)345
4
1006.5432
pp
0.9, 7.0
antiproton/proton ratio
PRL 105(2010)072002
5
1007.0516
pp
0.9
pion HBT
PRD 82(2010)052001
6
1007.0719
pp
0.9
charged particle pt spectra
PLB 693(2010)53
7
1011.3914
Pb-Pb
2.76
charged particle dN/deta
PRL 105(2010)252301
8
1011.3916
Pb-Pb
2.76
charged particle v2
PRL 105(2010)252302
9
1012.1004
Pb-Pb
2.76
charged particle RAA
PLB 696(2011)30
10 1012.1657
Pb-Pb
2.76
centrality dependence of Nch
PRL 106(2011)032301
11
pp
0.9
K0, phi, lambda, cascade
EPJC 71(2011)1594
12 1012.4035
Pb-Pb
2.76
pion HBT
PLB 696(2011)328
13 1101.3665
pp
0.9, 7.0
pion HBT
PRD 84 (2011) 112004
14 1101.4110
pp
0.9
pion, kaon, proton production
EPJC 71(2011)1655
15 1105.0380
pp
7.0
J/Psi production
PLB 704 (2011) 442+E
16 1105.3865
Pb-Pb
2.76
charged particle v3, v4,v5
PRL 107 (2011) 032301
17 1109.2501
Pb-Pb
2.76
angular correlations
PLB 708 (2012) 249
1012.3257
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
4
arxiv
system
energy (TeV)
observable
published in
18 1110.0121
Pb-Pb
2.76
angular correlations
PRL 108 (2012) 092301
19 1111.1553
pp
7.0
D production
JHEP 1201 (2012) 128
20
1111.1630
pp
7.0
J/Psi polarization
PRL 108 (2012) 082001
21 1112.2082
pp
0.9, 7.0
underlying event
JHEP 7 (2012) 116
22 1112.2222
pp
7.0
phi, omega production
PLB 710 (2012) 557
23 1201.2423
Pb-Pb
2.76
jet background
JHEP 1203 (2012) 053
24 1201.3791
pp
7.0
heavy-flavor muons
PLB 708 (2012) 265
25 1202.1383
Pb-Pb
2.76
J/Psi suppression
PRL 109 (2012) 072301
26 1202.2816
pp
7.0
Nch dependence of J/Psi production
PLB 712 (2012) 165
27 1203.2160
Pb-Pb
2.76
D suppression
JHEP 09 (2012) 112
28 1203.2436
Pb-Pb
2.76
electromagnetic dissociation
29 1203.3641
pp
2.76
J/Psi production
PLB 718 (2012) 295
30 1204.0282
pp
7.0
cascade, Omega production
PLB 712 (2012) 309
31 1205.3963
pp
0.9, 2.76, 7.0
sphericity
EPJ C72 (2012) 2124
32 1205.4007
pp
2.76
D production
JHEP 1207 (2012) 191
33 1205.5423
pp
7.0
heavy-flavor electrons
34 1205.5724
pp
0.9, 7.0
pi0, eta production
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
PLB 717 (2012) 162
5
arxiv
system
energy (TeV)
observable
35
1205.5761
Pb-Pb
2.76
v2 of high-pt hadrons pions protons
36
1205.5880
pp
7.0
J/Psi production
37
1205.6443
pp PbPb
2.76
heavy-flavor muons
38
1206.2056
pp
7.0
K0 HBT
39
1207.0900
Pb-Pb
2.76
azimuthal charge separation
40
1207.6068
Pb-Pb
2.76
net-charge fluctuations
41
1208.1902
pp
7.0
beauty decay electrons
42
1208.1948
pp
7.0
Ds production
43
1208.1974
Pb-Pb
2.76
pion, kaon, proton production
44
1208.2711
Pb-Pb
2.76
charged particle RAA
45
1208.4968
pp
0.9, 2.76, 7.0
pp cross section
46
1208.5717
pp
7.0
K*, phi production
47
1209.3715
Pb-Pb
2.76
coherent J/Psi in ultraperipheral
48
1210.3615
p-Pb
5.02
dNch/deta
49
1210.4520
p-Pb
5.02
charged particle RAA
50
1212.2001
p-Pb
5.02
ridges in p-Pb
51
1212.5958
pp
7.0
kaon HBT
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
published in
JHEP 11 (2012) 065
PLB 717 (2012) 151
PLB 718 (2012) 279
EPJ C72 (2012) 2183
6
bulk particle
production
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
7
charged-particle production: pseudorapidity distributions
p-Pb
Pb-Pb
M. Guilbaud, QM2012
arXiv:1210.3615
constrains initial conditions of
heavy-ion collision
models with shadowing or saturation
describe the measurement within 20%
saturation models too steep
constrains description of dynamics
of heavy-ion collision
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
8
charged-particle production: collision energy dependence
(dN ch/dη)/⟨N
part
⟩
5
4
3
2
Central AA
ALICE
ALICE
CMS
ATLAS
CDF
UA5
CMS
NA50
UA1
BRAHMS
STAR
pp (pp) INEL
PHENIX
ISR
UA5
PHOBOS
∝ s0.15
NN
STAR
arXiv:1210.3615
pp (pp) NSD
∝ s0.11
NN
PHOBOS
∝ s0.10
NN
ALICE
pPb ALICE
1
dAu PHOBOS
pAu NA35
0
ALI−PUB−46119
102
103
sNN (GeV)
LHC 2 times higher than RHIC
Pb-Pb 2 times higher than pp
p-Pb like INEL pp
steeper growth in AA than in pp and p-A
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
9
charged-particle production in Pb-Pb: comparison with models
PRL 105 (2010) 252301
extrapolation in sqrt(s)
adj. to pp, no jet quench.
pQCD
initial state gluon
saturation
hydro + final parton sat.
extrapolation from pp
Landau hydro
Pythia+ rescattering
higher yield than expected (by most)
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
10
charged-particle production: centrality dependence
PRL 106 (2010) 032301
~2 times more particles than at RHIC, same centrality dependence
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
11
charged-particle production: centrality dependence
PRL 106 (2010) 032301
soft+hard
saturation
general trend reasonably reproduced by majority of the models
individual differences larger than the difference between the two groups
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
12
hadron identification
ITS
TPC
TRD
TOF
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
13
Data/Model
1/ N ev 1/2πp d2Data/Model
N /(dp dy ) (GeV/ c1/)-2N ev
T
T
10-1
Blast Wave Fit
VISH2+1
HKM
Krakow
+ p (× 1)
identified hadron spectra - comparison topRHIC
10-36
10
105
2
0
1
arxiv:1208.1974
ALICE, Pb-Pb
sNN = 2.76
TeV
0-5% Central
collisions
sNN =4200 GeV 5
2 STAR, Au-Au,
3
- GeV
+ = 200
PHENIX, Au-Au, π
sNN
p+ π(GeV/
c)
T
1013
0
2
10 0
1
2
3
π+ + π- (× 100)
1
100-1
2
K +K
+
-
5
-
K + K (× 10)
0
1-3
10
0
0
2 0
Blast Wave Fit
1
VISH2+1
HKM
Krakow
1
1
2
3
4
p + p (× 1)
5
p+p
0-5% Central collisions
2
2
3
3
1
0
2
+4
4
4
5
5
π+ p+T π(GeV/
c)
p (GeV/ c )
T
harder than at RHIC
0
1
2
3
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
+4
-
5
14
⟨pT⟩ (GeV/c)
mean pT of identified hadrons
M. Floris, QM2011
2
π- (ALICE)
K (ALICE)
p (ALICE)
π- (STAR Au-Au 200 GeV)
K (STAR Au-Au 200 GeV)
p (STAR Au-Au 200 GeV)
1.8
1.6
1.4
ALICE Preliminary
Pb-Pb sNN = 2.76 TeV
1.2
1
0.8
0.6
0.4
0.2
0
σ2stat + σ2syst
102
103
dNch/dη
<pT> ~20% higher than at RHIC at the same multiplicity
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
15
identified hadron spectra: blast wave fit
M. Floris, QM2011
10% more transverse flow than at RHIC
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
16
ALICE, Pb-Pb sNN = 2.76 TeV
105
STAR, Au-Au, sNN = 200 GeV
PHENIX, Au-Au, sNN = 200 GeV
3
10
π+ + π- (× 100)
10
harder than VISH2+1
Data/Model
T
T
106
arxiv:1208.1974
1/ N ev 1/2πp d2N /(dp dy ) (GeV/ c )-2
identified hadron spectra - comparison to models
+
-
K + K (× 10)
10-1
Blast Wave Fit
VISH2+1
HKM
Krakow
10-3
2
0
1
p + p (× 1)
0-5% Central collisions
2
3
4
5
-
+
π p+T π(GeV/ c )
1
0
2
described by Krakow and HKM
(early flow, cross-over, realistic
EOS, resonances)
0
1
2
3
0
1
2
3
0
1
2
3
1
4
K+ + K
-
5
0
2
1
0
4
5
4
5
p+p
p (GeV/ c )
T
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
17
Data/Model
1/ N ev 1/2πp d2Data/Model
N /(dp dy ) (GeV/ c1/)-2N ev
T
T
10-1
Blast Wave Fit
proton deficit in Pb-Pb collisions p + p (× 1)
VISH2+1
HKM
Krakow
10-36
10
105
2
0
1
arxiv:1208.1974
ALICE, Pb-Pb
sNN = 2.76
TeV
0-5% Central
collisions
sNN =4200 GeV 5
2 STAR, Au-Au,
3
- GeV
+ = 200
PHENIX, Au-Au, π
sNN
p+ π(GeV/
c)
T
1013
0
2
10 0
1
2
3
π+ + π- (× 100)
1
100-1
2
K +K
+
-
5
-
K + K (× 10)
0
1-3
10
0
0
2 0
Blast Wave Fit
1
VISH2+1
HKM
Krakow
1
1
2
3
0
1
4
p + p (× 1)
5
p+p
0-5% Central collisions
2
2
3
3
less1protons than predicted by hydro
0
2
+4
2
4
4
5
5
π+ p+T π(GeV/
c)
p (GeV/ c )
T
3
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
+4
-
5
18
proton deficit in Pb-Pb collisions
protons not included
in the fit
less protons than predicted by thermal model
suggesting a lower chemical freeze-out temperature Tch
...but a lower Tch excluded by Ξ and Ω
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
19
spatial
extension
more on this subject: M. Szymanski, overview
of ALICE femtoscopy, this conference
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
20
identical-pion correlation analysis technique (HBT)
peak width ~ 1 / source size
1 fm source, simulation
pion source size accessible experimentally
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
21
definition of out-side-long axes
standard way to parametrize source size in 3-dim
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
22
3
8
a)
RoutRsideRlong (fm )
E895 2.7, 3.3, 3.8, 4.3 GeV
NA49 8.7, 12.5, 17.3 GeV
CERES 17.3 GeV
6
4
3/2
Rside (fm)
2
0
STAR 62.4, 200 GeV
PHOBOS 62.4, 200 GeV
ALICE 2760 GeV
8
b)
(2/)
Rout (fm)
pion HBT
10
6000
5000
4000
Phys. Lett. B 696 (2011) 328 (values scaled)
E895 2.7, 3.3, 3.8, 4.3 GeV
NA49 8.7, 12.5, 17.3 GeV
CERES 17.3 GeV
STAR 62.4, 200 GeV
PHOBOS 62.4, 200 GeV
ALICE 2760 GeV
3000
2000
1000
6
4
0
0
500
Rlong (fm)
2
1500
2000
 dN /dd œ
ch
0
KRAKOW
HKM
AZHYDRO
HRM
8
c)
4
2
0
2
4
6
homogeneity volume 2 x larger than at RHIC
growth with energy reasonably well described
by models tuned to RHIC data, containing
early flow, cross-over, realistic EOS, and
resonances
6
0
1000
8
10
12 14
 dN /dd œ 1/3
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb ch
results, Cracow Epiphany Conference 2013
23
pion HBT
5
1
RG
long (fm)
0
ALICE preliminary
RG
side (fm)
RG
out (fm)
kTœ = 0.4 GeV/c
5
1
5
10
 dNch/dd œ1/3
0
5
10
 dNch/dd œ1/3
STAR AuAu @ 200 AGeV
STAR CuCu @ 200 AGeV
STAR AuAu @ 62 AGeV
STAR CuCu @ 62 AGeV
5
CERES PbAu @ 17.2 AGeV
ALICE PbPb @ 2760 AGeV
ALICE pp @ 7000 GeV
radii
ALICE pp @ 2760 GeV
1
0
5
10
1/3
 dNch/dd œ
ALICE pp @ 900 GeV
STAR pp @ 200 GeV
fits to ALICE pp
fits to AA @ ) 200 AGeV
increase with multiplicity
both in pp and Pb-Pb but with
different slopes
à not only final multiplicity but
also initial geometry matters
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
24
pion HBT
8
a)
6
Rside (fm)
Rout (fm)
Phys. Lett. B 696 (2011) 328
4
8
b)
6
4
2
2
ALICE Pb-Pb 2.76 TeV
STAR Au-Au 200 GeV
0
0
0
0
0.2 0.4 0.6 0.8 1
 k œ (GeV/c)
10
c)
8
6
d)
1.4
1.2
1
4
0.8
2
0
0
T
Rout/Rside
Rlong (fm)
T
0.2 0.4 0.6 0.8 1
 k œ (GeV/c)
0.6
0.2 0.4 0.6 0.8 1
 k œ (GeV/c)
T
0.4
0
KRAKOW
HKM
AZHYDRO
HRM
kT dependence – sign
of transverse flow
0.2 0.4 0.6 0.8 1
 k œ (GeV/c)
T
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
25
pion HBT
arXiv:1101.3665v1 [hep-ex]
Nch 37-44
Nch 45-58
Nch 59-140
Rinv (fm)
2
ALICE pp @ 7 TeV
Nch 1-11
Nch 17-22
Nch 12-16
Nch 23-29
Nch 30-36
1.5
1
0.2
0.4
0.6
kT (GeV/c)
in pp, a similar kT dependence develops with increasing multiplicity
à flow in high-multiplicity pp?
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
26
flow
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
27
v2
elliptic flow in Au and Pb collisions
0.08
centrality 20-30%
PRL 105 (2010) 252302
0.06
0.04
0.02
ALICE
STAR
0
PHOBOS
PHENIX
-0.02
NA49
CERES
-0.04
E877
EOS
-0.06
E895
FOPI
-0.08
1
10
102
3
10
104
sNN (GeV)
hydrodynamic behavior continues at LHC energies
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
28
(a)
v2 {2} 40-50%
0.3
PRL 105 (2010) 252302
v2
elliptic flow
v2 {4} 40-50%
0.25
v2 {4} (STAR)
0.2
0.15
0.1
v2{4}
0.05
0
1
2
3
4
2
3
4
10-20%
5
pt (GeV/
(b) c )
20-30%
0.25
30-40%
10-20% (STAR)
0.2
20-30% (STAR)
30-40% (STAR)
0.15
0.1
0.05
0
1
5
p (GeV/c)
t
same pt dependence as at RHIC (and below, down to 40 GeV!)
inclusive v2 at LHC higher only because <pt> higher
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
29
elliptic flow of identified hadrons
ALICE preliminary, Pb-Pb events at
centrality 10%-20%
0.3
v2
v2
M. Krzewicki, QM2011
sNN = 2.76 TeV
ALICE preliminary, Pb-Pb events at
centrality 40%-50%
0.3
/!, v2{SP, |6d|>1}
K!, v2{SP, |6d|>1}
p, v {SP, |6d|>1}
/! ,
v2{SP, |6d|>1}
K , v2{SP, |6d|>1}
p, v {SP, |6d|>1}
!
2
2
0.2
sNN = 2.76 TeV
0.2
hydro LHC
(CGC initial conditions)
(d/s=0.2)
0.1
0.1
hydro LHC
(CGC initial conditions)
(d/s=0.2)
0
0
0.5
1
1.5
2
2.5
3
3.5
0
0
0.5
pt (GeV/c)
1
1.5
2
2.5
3
3.5
pt (GeV/c)
discrepancy for antiprotons – can be fixed by adding rescattering (UrQMD)
to hydro (Heinz, Shen, Song, arXiv:1108.5323v1)
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
30
0
0.10
0.4
10
20
30
40
50
60
70
v 2{2, |"!| > 1}/%CGC
{2}
2
(a)
80
(b)
3
v2 {2, |" !| > 1} 3
v3 {2, |" !| > 1}v {2, |"!| > 1}/ %W {2}
2
2
v4 {2, |" !| > 1}
v 3{2, |"!| > 1}/%W
{2}
v3 {4}
3
v3/# RP
100 $ v 23/# 2
0.3
0.05
0.2
PRL 107 (2011) 032301
Centrality 0-1%, |#| < 0.8
1.01
|"#| > 1
v2,3,4,5{2, |"#| > 1}
1.008
v {2, |"!| > 1}/%CGC{2}
v2
C("!)
vn/%n vn
higher harmonics of flow
1.006
1.004
1.002
v3
1
0.998
0.1
0.996
0
vn/%n
00
0
10
10
20
20
30
30
40
40
50
50
60
60
70
70
1}/%CGC
{2}
2
80
80
(b)
v 2{2, |"!| >percentile
centrality
0.4
v 3{2, |"!| > 1}/%CGC
{2}
3
v 2{2, |"!| >
2.0 < pt,trig < 3.0
1.0 < pt,assoc < 2.0
0.994
0.992
-1
0
1
1}/%W
{2}
2
2
3
4
"! (rad.)
v 3{2, |"!| > 1}/%W
{2}
3
0.3
v3 is not related to reaction plane
v only weakly depends on centrality
0.23
v2 and v3 magnitudes reasonably well described by hydro
the azimuthal correlations at high pT fully described by the flow coefficients
0.1
0
0
10
20
30
40
50
60
70
80
the
peaks
come from hydrodynamic flow
centrality percentile
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
31
probing QCD matter
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
32
nuclear modification factor
parton energy loss in
color medium
manifesting as
suppression of high-pt
particles in Pb-Pb
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
33
nuclear modification factor
arxiv: 1210.4520
1.8
ALICE, charged particles
p-Pb
RpPb , RPbPb
1.6
1.4
Pb-Pb
Pb-Pb
sNN = 5.02 TeV, NSD, | d
| < 0.3
cms
sNN = 2.76 TeV, 0-5% central, | d | < 0.8
sNN = 2.76 TeV, 70-80% central, | d | < 0.8
1.2
p-Pb is like pp
no suppression
1
0.8
0.6
0.4
0.2
suppression in Pb-Pb
0
2
4
6
8
10
12 14 16
18 20
p (GeV/c)
T
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
Parton energy loss in QCD medium
Rise at high pt: relative energy loss
decreasing with pt
34
RPbPb , RpPb
nuclear modification factor
2
Nch, p-Pb sNN = 5.02 TeV, NSD (ALICE)
Nch, Pb-Pb (ALICE)
Nch, Pb-Pb (CMS)
1.8
γ , Pb-Pb sNN = 2.76 TeV, 0-10% (CMS)
sNN = 2.76 TeV, 0-5%
1.6
W ± , Pb-Pb sNN = 2.76 TeV, 0-10% (CMS)
0
Z , Pb-Pb sNN = 2.76 TeV, 0-10% (CMS)
1.4
1.2
1
0.8
0.6
0.4
0.2
0
0
10
20
30
40
50
60
70
80
90
100
p (GeV/c), E (GeV), or mass (GeV/c 2)
T
T
ALI−DER−45646
no suppression of photons, W, Z0 in Pb-Pb
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
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mass dependent energy loss
ALICE JHEP 09 (2012) 112
ALICE arxiv:1208.2711
CMS-PAS-HIN-12-014
compilation A. Andronic
less suppression for heavy quarks
B < D, J/Psi < charged particles
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
36
J/Psi suppression – or enhancement?
sequential suppression
PLB 178 (1986) 416
statistical hadronization c+cbar  J/Psi PLB 490 (2000) 196
both effects expected to be stronger at LHC than at RHIC
2.5 < y < 4
|y| < 0.9
J/Psi production by statistical hadronization
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
37
hot photons
arXiv:1210.5958
photons measured via
conversions into e+e-
photon temperature higher than Tc
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
38
ridges in p-Pb
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
39
correlations originating from jets and other sources
arXiv:1212.2001
in high-multiplicity p-Pb, a ridge develops
(like the one reported by CMS)
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
40
difference between central and peripheral
arXiv:1212.2001
near-side ridge arising in high-multiplicity collisions
is accompanied by a similar ridge on the away side
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
41
properties of this double ridge
arXiv:1212.2001
Fourier analysis of the ridge à v2 and v3
like flow:
increase with pt
unlike flow: increase with centrality
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
42
three questions
to LHC
Helmut Satz, arXiv:1101.3937 “The Quark-Gluon Plasma”
Student Day Lecture, Goa, Dec 2010
… and three answers
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
43
first question to LHC: particle-source size
Helmut Satz, arXiv:1101.3937 “The Quark-Gluon Plasma”
Student Day Lecture, Goa, Dec 2010
ALICE: homogeneity volume at LHC two times higher than at RHIC
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
44
second question to LHC: photon temperature
Helmut Satz, arXiv:1101.3937 “The Quark-Gluon Plasma”
Student Day Lecture, Goa, Dec 2010
ALICE: T = 304 +- 51 MeV
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
45
third question to LHC: J/Psi suppression or regeneration
Helmut Satz, arXiv:1101.3937 “The Quark-Gluon Plasma”
Student Day Lecture, Goa, Dec 2010
ALICE: statistical regeneration dominates
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
46
summary
new insight into the reaction dynamics from LHC
  Mach cone and ridge challenged
  HBT R(kT) dependence developing with multiplicity in pp
  proton puzzle: lower yield, lower v2 than expected
  nuclear suppression decreasing at very high pt (RAA increasing)
  J/Psi production via statistical regeneration
  ridges in high-multiplicity pp and p-Pb collisions
~2 x higher than at RHIC
  particle production
  homogeneity volume
~10-30% higher than at RHIC
  transverse flow
  mean transverse momentum
  integrated elliptic flow
  mass-splitting of v2
like at RHIC
  centrality dependence of particle production
  centrality dependence of v2
  multiplicity dependence of HBT radii
  transverse momentum dependence of v2
  charge and pT fluctuations
  charge dependent azimuthal correlations
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
47
working at CERN - requirements
stay concentrated
always wear safety equipment
handle properly
the Unexpected
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
48
ML
July 31, 2012
2013 LHC & Injector Schedule V1.1
Draft Jan
Wk
1
Mo
We
Th
Fr
Sa
2
31
Feb
3
7
4
14
Technical stop
Tu
Recommission
injectors & LHC
(protons & ions)
5
21
PS open
Mar
6
28
7
4
8
Quench tests 11
9
18
10
25
11
4
12
11
13
18
25
SHUTDOWN LS1 G. Friday
LHC PROTON-­‐ION RUN IONS TO NORTH AREA Powering tests Su
Apr
Wk
14
Mo
Easter
May
15
1
16
8
17
15
June
18
22
19
29
20
6
21
13
Whit
22
20
23
27
24
3
25
10
26
17
24
Tu
We
Th
1st May
Ascension
Fr
Sa
Su
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
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ALICE plans











2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
later
LS1: completion of TRD,
PHOS, and DCAL
Pb-Pb at sqrt(s)=5.1 TeV
Pb-Pb at sqrt(s)=5.5 TeV
Pb-Pb at sqrt(s)=5.5 TeV
LS2: lumi upgrade from 0.5 to 50 kHz Pb-Pb, 3 x better vertexing
possibly Ar-Ar
possibly p-Pb at full energy
possibly Pb-Pb - reach 1 nb-1
LS3
reach 10 nb-1 Pb-Pb
ongoing upgrade studies
  MFT
Muon Forward Tracker
  VHMPID
Very High Momentum PID
  FoCal
Forward EM Calorimeter
pixel Si -4<eta<-2.5, better res. and S/B, c/b
gas Cher., pi/K/p separation in 5<p<25 GeV
W+Si 2.5<eta<4.5
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
50
centrality determination
PRL 106 (2010) 032301
!   VZERO covers -3.7< η<-1.7 and 2.8<η<5.1, signal ~ multiplicity
!   fit function: a Ncoll + b Npart sources, each source producing
particles following a negative binomial distribution
!   centrality resolution better than 1%
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
51
hadron identification
pion-kaon separation
kaon-proton separation
good PID performance over large pt range
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
52
Number of Entries
hadron identification
300
×103
0-5 % centrality
250
ALICE performance
Pb-Pb at sNN = 2.76 TeV
11/05/2011
K0S
200
150
0.5 < pT < 1.5 GeV/c
100
300x
50
0.45 0.46 0.47 0.48 0.49
0.5
5.5 < pT < 6.5 GeV/c
0.51 0.52 0.53 0.54
Number of Entries
Mass (π-π+) (GeV/c2)
9000
8000
7000
ALICE Performance
Pb-Pb at sNN = 2.76 TeV
11/05/2011
80-90 % centrality
K0S
6000
5000
4000
K0  π+π-
0.5 < pT < 1.5 GeV/c
3000
2000
1000
100x
0
0.45 0.46 0.47 0.48 0.49
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
0.5
5.5 < pT < 6.5 GeV/c
0.51 0.52 0.53 0.54
Mass (π-π+) (GeV/c2)53
T
|η| < 0.8
0.15 < pT < 2 GeV/c
10-1
10-2
1
Preliminary
S. Heckel, QM2011
Cm / < p >m
pt fluctuations
sNN = 2.76 TeV
ALICE pp
ALICE Pb-Pb
HIJING Pb-Pb
Power law fit ALICE pp
Power law fit HIJING
10
102
103
Nacc
universal scaling
suppression in central collisions
absent in HIJING
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
54
!10-3
1.5 same opp.
ALICE Pb-Pb @ sNN = 2.76 TeV
1
STAR Au-Au @ sNN = 0.2 TeV
`
 cos(q_ + q - 2^RP) œ
charge dependent azimuthal correlations
0.5
Preliminary
0
-0.5
0
10
20
30
40
50
60
70
80
centrality, %
similar shape and magnitude as at RHIC
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
55
ALICE, Pb-Pb, sNN = 2.76 TeV
charged particles, |d|<0.8
1018
RAA
T
1/Nevt 1/(2/ p ) (d2Nch) / (dd dp ) (GeV/c)-2
1022
12
10
ALICE, Pb-Pb, sNN = 2.76 TeV
norm. uncertainty
charged particles, |d| < 0.8
T
1
106
1
10-1
10-6
ALICE (0-5%)
16
-12
10
10
50-60% (x104)
8
2
60-70%
0 (x10 )
6
70-80%
0-5% (x10 )
20-30% (x10 )
5-10% (x1014)
30-40% (x10 )
12
10-20% (x10 )
40-50% (x10 )
pp reference (scaled by <T
1
AA
CMS (0-5%)
10
20
HT (Chen et al.) lower density
HT (Chen et al.) higher density
HT (A.M.)
ASW (T.R.)
YaJEM-D (T.R.)
elastic (T.R.) large P esc
elastic (T.R.) small P esc
WHDG (W.H.) /0 upper limit
WHDG (W.H.) /0 lower limit
30
40
50
p (GeV/c)
T
>)
10
p (GeV/c)
T Conference 2013
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany
56
nuclear modification factor in p-Pb – comparison to models
1.8
1.6
p-Pb sNN = 5.02 TeV
ALICE, NSD, charged particles, |dcms | < 0.3
1.4
saturation models OK
1.2
1
0.8
Saturation (CGC), rcBK-MC
Saturation (CGC), rcBK
Saturation (CGC), IP-Sat
0.6
0.4
1.8
Shadowing, EPS09s (/0)
1.6
LO pQCD + cold nuclear matter
RpPb
1.4
shadowing OK
1.2
1
0.8
0.6
0.4
1.8
s g=0.28
DHC, s g=0.28
HIJING 2.1
1.6
DHC, no shad.
DHC, no shad., indep. frag.
1.4
Hijing, DPMJET – problems
in describing the data
1.2
1
0.8
0.6
0.4
0
2
4
6
8
10
12
14
16
18
20
pT (GeV/c)
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
57
p+Pb = pp + double ridge
arXiv:1212.2001
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
58
Dariusz Miskowiec, ALICE Pb-Pb and p-Pb results, Cracow Epiphany Conference 2013
59