NFQCD2013, Kyoto, Japan, Nov.18- Dec.20,2013 12/04/2 013 Dynamical Modeling and Soft Physics at RHIC and the LHC Huichao Song Peking University Selected Topics : (1) QGP viscosity at RHIC and the LHC (2) Initial State fluctuations & final state correlations (3) Elliptic flow for strange & multi- strange hadrons (4) Soft particle yields and Chemical
Dynamical Modeling and Soft Physics at RHIC and the LHC. Huichao Song . Peking University . NFQCD2013, Kyoto, Japan, Nov.18-Dec.20,2013. Selected Topics : (1) QGP viscosity at RHIC and the LHC (2) Initial State fluctuations & final state correlations - PowerPoint PPT Presentation
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NFQCD2013, Kyoto, Japan, Nov.18-Dec.20,2013
12/04/2013
Dynamical Modeling and Soft Physics at RHIC and the LHC
Huichao Song Peking University
Selected Topics:(1) QGP viscosity at RHIC and the LHC(2) Initial State fluctuations & final state correlations(3) Elliptic flow for strange & multi-strange hadrons (4) Soft particle yields and Chemical Freeze-out at the LHC(5) Dynamical modeling near the critical point
Viscous Hydrodynamics
0)( xT gpuupeT )()(
u
TT
212
viscous hydrodynamics
Assume zero net baryon density & heat conductivity at RHIC and LHC
Neither the strongly nor the weakly coupling limit nor the cases in between (VISHNU) could explain the mass-ordering between proton & phi shown by STAR
phi-meson puzzle !
H. Song, S. Bass, U. Heinz, arXiv:13110157 [nucl-th]
Critical Fluctuations :
22 ~)( N
~At critical point :Size effects: 3fm)-O(2
It is important to address the effects from dynamical evolutions
dynamical modeling near the critical point
(6) Beyond Hydrodynamics
5.43 ~)( N73 ~)( N
0
qqgUeff
ST fluid
)( 2
uU
uS eff
order parameter
quark & anti-quark is treated as the heat bath (fluid), which interact with the chiral field via effective mass g
Dynamical modeling near the critical point -mean field approximation
K. Peach, H. Stocker and A. Dumitru, PRC2003
),(][21)]([ 5
UqigiqL
)0(
),(][21)]([ 5
UqigiqL
propagation of initial fluctuations-mean field approximation
K. Peach, H. Stocker and A. Dumitru, PRC2003
fluidg=5.5
fluid g=3.7
0
qqgUeff
ST fluid
)( 2
uU
uS eff
)0(
First -orderCritical point
Dynamical modeling near the critical point -beyond mean field
t
eff qqgU
ST fluid
)( 2
uU
uS eff
: damping
: noise,
Jiang &Songpreliminary
M.Nahrgang, S.leupold. C. Herold, M. Bleicher , PRC 2011
Dynamical modeling near the critical point (Chiral fluid dynamics with a Polyakov loop PNJL) C. Herold, et, al. PRC 2012
First -order Critical point
-To compare with the experimental data, systematic treatment of freeze-out with external field is necessary
(1) QGP viscosity at RHIC and the LHC
(2) Initial state fluctuations & final state correlations
(3) Soft particle yields & chemical freeze-out at the LHC
(4) Elliptic flow for strange & multi-strange hadrons
-Approximately similar averaged QGP viscosity at RHIC and LHC energies - (MC-Glauber; MC-KLN))4/1(5.2)/()4/1( QGPs
-New observables to constrain QGP viscosity & initial conditions
-B-Bbar annihilation plays an important role for proton yields -Effective chemical freeze-out of the system with B-Bbar annihilation
-phi-elliptic flow needs a better understanding
(5) Dynamical modeling near the critical point -External sigma field re-organize the structure of initial & internal fluctuations -systematic treatment of the freeze-out with external field is needed in the future