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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?. Physics Questions to be addressed. What is the equation of state? Is there a phase transition? - PowerPoint PPT Presentation
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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
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