EoS working group: mission & status
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Transcript of 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
RHIC-II EoS working group EoS Physics Program #2
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
RHIC-II EoS working group EoS Physics Program #3
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
RHIC-II EoS working group EoS Physics Program #4
Lattice and EoSLattice and EoS
No surprise to Lattice people that didn’t reach SB limit
• Karsch
RHIC-II EoS working group EoS Physics Program #5
Lattice and ViscosityLattice and Viscosity
• What is the viscosity? – Answer not coming from Lattice
• Karsch
RHIC-II EoS working group EoS Physics Program #6
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
RHIC-II EoS working group EoS Physics Program #7
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
RHIC-II EoS working group EoS Physics Program #8
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
RHIC-II EoS working group EoS Physics Program #9
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
RHIC-II EoS working group EoS Physics Program #10
Thermal Photons Thermal Photons Au+Au 0-10% central (<b> = 3.2 fm)
• d’Enterria
RHIC-II EoS working group EoS Physics Program #11
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.
RHIC-II EoS working group EoS Physics Program #12
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
RHIC-II EoS working group EoS Physics Program #13
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
RHIC-II EoS working group EoS Physics Program #14
U+U to test Hydro limitU+U to test Hydro limit
• Kuhlman
• Possible with EBIS• Could be possible before LHC
RHIC-II EoS working group EoS Physics Program #15
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