EoS Physics Program

1
EoS working group mission status

• What physics topics are to be addressed?
• What observables are sensitive to this physics?
• Where do we stand and what have we learned so
  far?

2
Physics Questions to be addressed

• What is the equation of state?
• Is there a phase transition?
• Where is the soft point?
• Is there thermalization?
• Character of the medium and dissipative effects
• How does hadronization occur?
• Freeze-out

3
Agenda

• Lattice Calc. about the EoS Karsch
• EBIS source and RHIC-II beams Fischer
• 3-D Hydro Hirano
• Viscous Hydro Teaney
• Updates from Reco Greco
• Constraining EoS with Thermal photon dEnterria
• Femtography Panitkin
• What have we learnt about EoS from experiment
  Witt
• Using UU Kuhlman
• Assymetric Collisions - Stankus

4
Lattice and EoS

• Karsch

No surprise to Lattice people that didnt reach
SB limit
5
Lattice and Viscosity

• Karsch

• What is the viscosity? Answer not coming from
  Lattice

6
All Hydro. not the same
p
p

• Hirano
• Teaney

elliptic flow
PHENIX white paper, nucl-ex/0410003
pT spectra
7
A method to extract Viscosity

• Stankus

viscosity is a dissipative effect drive local
equilibrium towards global equilibrium. So
higher viscosity means lower v2, and also lower
v3, v4, etc. (v1 is a special case, since it
obeys a sum rule).
v3
v2
Colliding asymmetric systems will allow us access
to odd values of vn Is v3 more sensitive than v2
to viscosity? Need Hydro with viscosity to
answer Need 3-D hydro to answer

• Currently work on 3-D hydro and hydroviscosity
• Need to combine Hydro with cascade with Reco

8
Recent Reco progress

• Higher fock states now included
• Resonances now included
• Neither have big effect

• breaking of the scaling at high pT
• to be test

• Greco

9
Recombination and charm flow
V2 of electrons

• Direct charm better

V.G. et al., PLB595 (04) 202
10
Thermal Photons
AuAu 0-10 central (ltbgt 3.2 fm)

D.d'E. D.Peressounko nucl-th/0503054

• dEnterria

11
QGP EoS from thermal g hadron multiplicities
(I)

• correlating thermal g slopes hadron
  multiplicities
• Evolution of the effective of degrees of
  freedom, g(s,T), with centrality

• . QGP plateau should be observable in the data.

12
Low Energy running to see step

• Energy 40 GeV Au-Au needed

D.d'E. D.Peressounko (in preparation)

• 62.4 GeV

13
HBT and Energy scan

• No peak seen in data so far.

• Energy scan could find the soft point

• Panitkin

• Need theory work to solve HBT puzzles

14
UU to test Hydro limit

• Possible with EBIS
• Could be possible
• before LHC

• Kuhlman

15
Summary

• Much data out there the Theory is catching up.
• We can learn a great deal about EoS with
  present data
• Do we need RHIC-II for EoS?

Yes
Need an energy/species scan to turn off QGP
and follow evolution of the EoS. v2 from
direct charm measurement Separating
Hydro/Reco/pQCD regimes needs high statistics
data at high pT. PID needed
These need high statistics so high
luminosity Need to keep forward physics
capabilities Support for our Theorists