Experimental conference summary

1
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

2
Multiplicity

• RHIC 130 GeV

B. Jacak
3
Multiplicity

• RHIC 200 GeV
• The increase is moderate
• Good news for LHC people

M.Baker, J.J.Gaardhoje
4
Multiplicity

• BRAHMS
• Central 0-6
• ? N(ch)d? 5100300
• dN(ch)/d? (?0) 610?50
• FWHM of distribution ?? 7.9 ? 1.0

M.Baker, J.J.Gaardhoje
5
Energy density

• e ? 4.6 GeV/fm3
• gt 50 higher than at CERN

Phenix 130 GeV
B. Jacak
6
Stopping

• Antiproton/proton ratio

P.Jones, J.J.Gaardhoje
7
Stopping

• More stopping in central collisions
• No PT dependence of pbar/p ratio

B.Jacak, J.J.Gaardhoje, P.Jones
8
Electromagnetic dissociation

• Important issue for luminosity measurement LHC

J.J.Gaardhoje
9
Anisotropic flow

• Ex. NA49

A.Poskanzer
10
Anisotropic flow

• RHIC V2 component (elliptic flow)

STAR
P.Jones, A.Poskanzer
11
Anisotropic flow

• Anisotropy shows a clear centrality and PT
  dependence

R.Lacey
12
HBT

• Source size systematics does not exhibit
  qualitative differences fro SPS to RHIC

P.Jones
13
HBT

• STAR

F.Retiere
14
Inverse slopes

• SPS and RHIC results

K.Safarik, D.Rohrich
15
Inverse slopes HBT

• _at_ SPS, Tfo ? 100 MeV, ltvgt? ? 0.55c
• Tfo somewhat higher _at_ RHIC

P.Jones
16
Strangeness

• Kaons _at_ RHIC
• Increase with centrality
• Not qualitatively different from SPS

P.Jones, C.Roy
17
Strangeness

• Strange baryons onset ?

K.Safarik
18
Strangeness

• New proton nucleus data
• Onset or continuous increase ?

K.Kadjia
19
Strangeness

• Energy dependence ?
• Maximum 40 GeV ?

M.Gazdzicki
20
Strangeness

• Rhic results

P.Jones, C.Roy
21
Charmonium

• Interpretation of the NA50 results

A.Romana

• Problem with low Et
• Data gt normal absorption ???
• Comovers far above normal absorption
• How does it reproduce S-U and p-A ?
• NA50 Y2K data

22
Charmonium

• How well do we know J/y prod ?
• p-A
• Nucl. absorption cross section
• p-y cross section
• Color octet
• New results expected
• NA50 Y2K data
• PHENIX
• NA60, lighter ions
• Which interpretation for charmonium production _at_
  LHC ?
• Recombinations
• Feed-down from beauty decay
• Thermal production ?

M.Leitch
23
Low mass dileptons

• Last CERES result _at_ 40 GeV

D.Miskowiec
24
Low mass dileptons

• NA60 can provide new elements

E.Scomparin
25
Direct photons
WA98
T.Awes
26
High PT

• High PT depletion in hadron spectra
• With respect to p-p
• Central wrt peripheral

B.Jacak
27
High PT

• Clearly seen by both STAR PHENIX

P.Jones
28
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