Download Conference summary

Experimental conference summary
General features of RHIC collisions
Particle multiplicity
Energy density
Stopping
E-M dissociation
From SPS to RHIC
Anisotropic flow
Inverse slopes
HBT
Strangeness
Open issues
Charmonium
Dielectrons
Photons
Energy loss
O. Drapier
IWPQGP 2001, Sept. 7 th
1
Multiplicity
RHIC 130 GeV
with quenching
STAR
PHENIX
BRAHMS
No jet quenching
B. Jacak
O. Drapier
IWPQGP 2001, Sept. 7 th
2
Multiplicity
RHIC 200 GeV
BRAHMS
Theory 1999
200 AGeV
PHOBOS 2001
Syst
PHOBOS 2000
PRL 85 (2000) 3100
& nucl-ex/0108009
M.Baker, J.J.Gaardhoje
The increase is moderate …
Good news for LHC people
O. Drapier
IWPQGP 2001, Sept. 7 th
3
Multiplicity
BRAHMS 200AGEV
200 GeV PHOBOS
130 GeV
PHOBOS
UA5 200 GeV
Data from
nucl-ex/0108009
M.Baker, J.J.Gaardhoje
BRAHMS:
Central 0-6%
 N(ch)d= 5100±300
dN(ch)/d (=0) =61050
FWHM of distribution = 7.9  1.0
O. Drapier
IWPQGP 2001, Sept. 7 th
4
Energy density
e  4.6 GeV/fm3
> 50% higher than at CERN
Phenix 130 GeV
O. Drapier
IWPQGP 2001, Sept. 7
th
B. Jacak
5
Stopping
Antiproton/proton ratio
P.Jones, J.J.Gaardhoje
O. Drapier
IWPQGP 2001, Sept. 7 th
6
Stopping
pbar/p
More stopping in central collisions
No PT dependence of pbar/p ratio
BRAHMS 130 GeV
Preliminary
PHENIX 130 GeV preliminary
O. Drapier
IWPQGP 2001, Sept. 7 th
B.Jacak, J.J.Gaardhoje, P.Jones7
Electromagnetic dissociation
Important issue for luminosity
measurement & LHC
1n
EM dissociation selected
by ZDC coincidences
n
n
n
and TMA Veto in
BRAHMS
NLO
2n
LO
J.J.Gaardhoje
O. Drapier
IWPQGP 2001, Sept. 7 th
8
Anisotropic flow
Ex.: NA49
A.Poskanzer
O. Drapier
IWPQGP 2001, Sept. 7 th
9
Anisotropic flow
RHIC: V2 component (elliptic flow)
STAR
PRL 86,
(2001) 402
|| < 1.3
0.1 < pt <
2.0
SPS
RQMD
AGS
P.Jones, A.Poskanzer
O. Drapier
IWPQGP 2001, Sept. 7 th
10
Anisotropic flow
Anisotropy shows a clear centrality
and PT dependence
R.Lacey
O. Drapier
IWPQGP 2001, Sept. 7 th
11
HBT
Source size
systematics does not
exhibit qualitative
differences fro SPS to
RHIC
P.Jones
O. Drapier
IWPQGP 2001, Sept. 7 th
12
HBT
STAR
F.Retiere
O. Drapier
IWPQGP 2001, Sept. 7 th
13
Inverse slopes
SPS and RHIC results
K.Safarik, D.Rohrich
O. Drapier
IWPQGP 2001, Sept. 7 th
14
Inverse slopes & HBT
@ SPS, Tfo  100 MeV, <v>  0.55c
Tfo somewhat higher @ RHIC
Tth [GeV]

p
K-
At chi square minimum
Tth = 0.13 [GeV]
<r >= 0.52 [c]
-
0
O. Drapier
0.4
0
<r > [c]
0.4
IWPQGP 2001, Sept. 7 th
P.Jones
15
Strangeness
Kaons @ RHIC
Increase with centrality
Not qualitatively different from SPS
SPS
P.Jones, C.Roy
O. Drapier
IWPQGP 2001, Sept. 7 th
16
Strangeness
Strange baryons : onset ?
K.Safarik
O. Drapier
IWPQGP 2001, Sept. 7 th
17
Strangeness
New proton nucleus data
Onset or continuous increase ?
K.Kadjia
O. Drapier
IWPQGP 2001, Sept. 7 th
18
Strangeness
Energy dependence ?
Maximum ~ 40 GeV ?
M.Gazdzicki
O. Drapier
IWPQGP 2001, Sept. 7 th
19
Strangeness
Rhic results
P.Jones, C.Roy
O. Drapier
IWPQGP 2001, Sept. 7 th
20
Charmonium
Interpretation of the NA50 results
Problem with low Et
A.Romana
Data > normal absorption ???
Comovers far above normal absorption
How does it reproduce S-U and p-A ?
NA50 Y2K data …
O. Drapier
IWPQGP 2001, Sept. 7 th
21
Charmonium
How well do we know J/y prod ?
p-A
Nucl. absorption cross section
-y cross section
Color octet
New results expected
NA50 Y2K data
PHENIX
NA60, lighter ions
M.Leitch
Which interpretation for charmonium production @ LHC ?
Recombinations
Feed-down from beauty decay
Thermal production ?
O. Drapier
IWPQGP 2001, Sept. 7 th
22
Low mass dileptons
Last CERES result @ 40 GeV
D.Miskowiec
O. Drapier
IWPQGP 2001, Sept. 7 th
23
Low mass dileptons
NA60 can provide new elements
E.Scomparin
O. Drapier
IWPQGP 2001, Sept. 7 th
24
Direct photons
WA98
T.Awes
O. Drapier
IWPQGP 2001, Sept. 7 th
25
High PT
High PT depletion in hadron spectra
With respect to p-p
Central wrt peripheral
B.Jacak
O. Drapier
IWPQGP 2001, Sept. 7 th
26
High PT
Clearly seen by both STAR & PHENIX
Preliminary QM01
O. Drapier
Preliminary QM01
IWPQGP 2001, Sept. 7
th
P.Jones
27
conclusion
RHIC : Particle multiplicity not as high as
expected few years ago
So far, no big surprise with
Enegy density
Stoping
Flow
Expansion
Strangeness ??
Open issues
Charmonium
Low mass dileptons
Photons
Jet Quenching promising issue²
O. Drapier
IWPQGP 2001, Sept. 7 th
28