マイ・タイムライン作成例...マイ・タイムラインをつくろう。( ) 避難完了 全ての避難準備 にかかる時間( )分 ( )分 ( )分 (
完全流体 QGP は 見つかったか?
description
Transcript of 完全流体 QGP は 見つかったか?
完全流体完全流体 QGPQGPはは見つかったか?見つかったか?
Tetsufumi HiranoTetsufumi Hirano
平野哲文平野哲文Institute of Physics, University of TokyoInstitute of Physics, University of Tokyo
東大総文東大総文Collaborators: U.Heinz, D.Kharzeev, R.Lacey, and Y.NaraCollaborators: U.Heinz, D.Kharzeev, R.Lacey, and Y.Nara
日本物理学会 2006年秋季大会於奈良女子大学
OutlineOutline
• Discovery of Perfect Liquid QGP
• Basis of Announcement
• Three Inputs in Hydrodynamic Models
• Sensitivity of Assumptions to v2 in Hydro
– Freezeout– Initial condition
• v2 from CGC initial conditions
• Summary and Outlook
““RHIC serves the perfect liquid”RHIC serves the perfect liquid”
http://www.bnl.gov/bnlweb/pubaf/pr/PR_display.asp?prID=05-38
Basis of the AnnouncementBasis of the AnnouncementPHENIX(’03)STAR(’02)
Multiplicity dependencepT dependenceand mass ordering
Hydro results: Huovinen, Kolb, Heinz,…
Three Inputs for Hydrodynamic Three Inputs for Hydrodynamic ModelsModels
Final stage:• Decoupling prescription
Intermediate stage:• Equation of State, P(e,n)
Initial stage:• Initial energy/entropy density distribution• Initial time
0z
t
Important to check the sensitivity of the above assumptions to final results
Sensitivity of Different Assumptions Sensitivity of Different Assumptions in Early/Late Stagesin Early/Late Stages
??Gradual
freezeout(Hadronic rescattering)
?Discovery of
“Perfect Liquid”Sudden
freezeout
Color Glass Condensate
Glauber-typeInitialInitialConditionCondition
FreezeoutFreezeout
Consistency?Consistency?Elliptic flow Particle ratio
Issue: Conventional ideal hydro could not reproduce particle ratio.Solution: Introduction of chemical freezeout in hydro.
Interpretation: Accidental reproduction by ideal hydro. Necessity of dissipation in the hadron phase.
TH and M.Gyulassy(’06)
N.Arbex et al.(’01), TH and K.Tsuda(’02), D.Teaney(’02)
Hyd
ro:
P.H
uovi
nen
Dat
a: P
HE
NIX
PH
EN
IX w
hite paper
Highlights from a Hydro+Cascade Model Based on Glauber-type Initial Conditions
TH et al.(’06); in preparation.
Sensitivity of Different Assumptions Sensitivity of Different Assumptions in Early/Late Stages in Early/Late Stages
?Discovery of Perfect fluid QGP & hadronic
corona
Gradual
freezeoutHadronic rescattering
?Discovery of
“Perfect Liquid”Sudden
freezeout
Color Glass Condensate
Glauber-typeInitialInitialConditionCondition
FreezeoutFreezeout
Two Initial Conditions Which Clear Two Initial Conditions Which Clear the First Hurdle the First Hurdle
•Glauber model Npart:Ncoll = 85%:15%•CGC model Matching I.C. via e(x,y,)
Centrality dependence Rapidity dependence
vv22(N(Npartpart) from ) from
QGP Hydro + Hadronic CascadeQGP Hydro + Hadronic Cascade
Glauber: Early thermalization Mechanism? CGC: No perfect fluid? Additional viscosity
is required in QGP
Importance of better understanding of initial condition
TH et al.(’06)
Large Eccentricity from CGC Initial Large Eccentricity from CGC Initial ConditionCondition
xx
yy
Pocket formula (ideal hydro): v2 ~ 0.2 @ RHIC energies
Ollitrault(’92)
Hirano and Nara(’04), Hirano et al.(’06)Hirano and Nara(’04), Hirano et al.(’06)Kuhlman et al.(’06), Drescher et al.(’06)Kuhlman et al.(’06), Drescher et al.(’06)