EoS working group: mission & status

RHIC-II EoS working group EoS Physics Program #1

1. What physics topics are to be addressed?2. What observables are sensitive to this physics?3. Where do we stand and what have we learned

so far?

EoS working group: mission & status

EoS working group: mission & status

Conveners:

Steffen A. Bass

Helen Caines

Julia Velkovska


Physics Questions to be addressed

Physics Questions to be addressed

1. What is the equation of state?2. Is there a phase transition?3. Where is the soft point?4. Is there thermalization?5. Character of the medium and dissipative effects6. How does hadronization occur?7. Freeze-out


AgendaAgenda

• 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 – d’Enterria• Femtography – Panitkin• What have we learnt about EoS from experiment – Witt• Using U+U – Kuhlman• Assymetric Collisions - Stankus


Lattice and EoSLattice and EoS

No surprise to Lattice people that didn’t reach SB limit

• Karsch


Lattice and ViscosityLattice and Viscosity

• What is the viscosity? – Answer not coming from Lattice

• Karsch


All Hydro. not the sameAll Hydro. not the sameP

HE

NIX

wh

ite p

ape

r, nucl-e

x/04

100

03

elliptic flow

pT spectra

p • Hirano• Teaney


v2

v3 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).

A method to extract Viscosity

A method to extract Viscosity

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 answerNeed 3-D hydro to answer

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

• Stankus


Recent Reco progressRecent Reco progress

• Higher fock states now included• Resonances now included

• Neither have big effect

Duke

• breaking of the scaling at high pT to be test

• Greco


Recombination and charm flow

Recombination and charm flow V2q from , p, K, L

Coalescence can predictv2D for v2c = 0

V2 of electrons

V.G. et al., PLB595 (04) 202• Direct charm better


Thermal Photons Thermal Photons Au+Au 0-10% central (<b> = 3.2 fm)

• d’Enterria


QGP “EoS” from thermal QGP “EoS” from thermal && hadron hadron multiplicities (I)multiplicities (I)

QGP “EoS” from thermal QGP “EoS” from thermal && hadron hadron multiplicities (I)multiplicities (I)

correlating thermal slopes & hadron multiplicitiesEvolution of the effective # of degrees of freedom, g(s,T), with centrality:

. QGP “plateau” should be observable in the data.


Low Energy running to see step

Low Energy running to see step

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

• Energy ~ 40 GeV Au-Au needed

• 62.4 GeV


HBT and Energy scanHBT and Energy scan

• Panitkin

• Energy scan could find the soft point

• No peak seen in data so far.

• Need theory work to solve HBT puzzles


U+U to test Hydro limitU+U to test Hydro limit

• Kuhlman

• Possible with EBIS• Could be possible before LHC


SummarySummary• 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?

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 luminosityNeed to keep forward physics capabilitiesSupport for our Theorists

Yes

Documents

EoS working group: mission & status