1. Heavy Quarkonium production ITP,Gothe Uni.Frankfurt
in HIC at LHC
Kai Zhou
Based on : PRC89,054911(arXiv: )
JPG: Nucl.Part.Phys.41,124006(arXiv: )
NPA931,654(arXiv: )
ITP,Gothe Uni.Frankfurt
In collaboration with: Yunpeng liu, Zhe Xu, Nu Xu, Pengfei Zhuang
Tuesday, January 01, 2019
Kai ECT*

2. Outline ● Introduction ● Transport model ● Numerical Results
● Summary & Outlook
Tuesday, January 01, 2019
Kai ECT*

3. ● produced via hard processes from early stage
Introduction
large mass scalee
● produced via hard processes from early stage
● "calibrated" QCD Force--heavy quark interaction
● in vacuum NR potential（or NRQCD）e.g
spectroscopy well described
● in medium Color screening
Satz and Matsui: PLB178, 416(1986):
J/Psi suppression as a probe of QGP in HIC
Tuesday, January 01, 2019
Kai ECT*

4. Introduction ● Thermometer
e.g for V=U=F+TS (Satz et al, 06) F from lQCD :
● Not so simple, many other effects affecting...
cold matter effects(nuclear absorption,cronin,shadowing)
collisional break-up (gluo-dissociation, quasi-free dissociation)
regeneration/recombination(PBM,Thews,R.Rapp...)
= 1 No effect
< 1 Suppression
> 1 Enhancement
● Observation
Tuesday, January 01, 2019
Kai ECT*

5. Introduction from SPS, to RHIC, Now, we are at LHC era
● Unifed model including interplay of Cold and Hot matter effects
● With increasing coll.energy, Hot medium effects increase? where?
Tuesday, January 01, 2019
Kai ECT*

6. Transport(cold&hot) + Hydrodynamic
Transport Model
Transport(cold&hot) + Hydrodynamic
Hydrodynamic
Evolution for
the medium
hot nuclear matter effects
1)Dissociation )Regeneration
Transport
Equation
for heavy
quarkonium
cold nuclear matter effects
1)Absorption )Cronin effect )Shadowing effect
Tuesday, January 01, 2019
Kai ECT*

7. Transport Model- transport equation & hot effects
● quarkonium distribution function in phase space
1) Gluon dissociation :
Spectral Function
OPE (Peskin,1979)
in Vacuum
Above some temperature Td, spectral peak dissapears,but below Td, very little change
in Medium
Tuesday, January 01, 2019
Kai ECT*

8. Transport Model- hot nuclear matter effects
● quarkonium distribution function in phase space
1) Gluon dissociation :
OPE (Peskin,1979)
in Vacuum
in Medium
Tuesday, January 01, 2019
Kai ECT*

9. Transport Model- hot nuclear matter effects
● quarkonium distribution function in phase space
2) in-Medium Regeneration :
Detailed balance :
Distribution functon for heavy quarks :
We observed large quench for D meson
and also very large flow v2(similar with
light hadrons):
Tuesday, January 01, 2019
Kai ECT*

10. Transport Model- hot nuclear matter effects
● quarkonium distribution function in phase space
2) in-Medium Regeneration :
Detailed balance :
Distribution function for heavy quarks :
Take kinetically thermalization approximation
heavy quark number conservation:
Tuesday, January 01, 2019
Kai ECT*

11. Transport Model- cold nuclear matter effects
● initial condition for transport
Superposition from pp collisions (Glauber model) along with modification from CNM:
Nuclear
absorption
Absorption
neglected at LHC
Cronin effetc
Cronin
Cold
Effects
Shadowing
nPDF vs. PDF
R.Vogt et al. PRL91 (2003)
PRC71(2005)
Tuesday, January 01, 2019
Kai ECT*

12. Transport Model- test of cold matter in p-Pb
p-Pb 5.02 TeV
Cronin + Shadowing(EKS98)
can describe the p-Pb(5.02
TeV) data well !
Tuesday, January 01, 2019
Kai ECT*

13. Transport Model- ideal Hydro dynamics
● 2+1D hydrodynamics( )
kinetic thermalization for HQ
Boost Invariance in z-direction
● Equation Of State:
Ideal Gas with quarks and gluons for QGP
& HRG for Hadronic phase
● Initialization:
Glauber model & constrained by
fitting Charged Multiplicities
Tuesday, January 01, 2019
Kai ECT*

14. Results—Yield's Centrality depen.（all pT）
1、Regeneration plays an important roll in most of centralities, and can be dominant.
2、Competition leads to platform structure in most centralities.
PRC89,054911(2014)
Tuesday, January 01, 2019
Kai ECT*

15. Results—Yield's Centrality depen.（pT bin）
Forward Rapidity
1、flat structure gradually dissappears with pT.---->
Regeneration is mostly contributed in low pT part.
2、Jpsi naturally provide two probes:
a） Hard Probe：high pT，Color Screening
b） Soft Probe：low pT，Thermalization
PRC89,054911(2014)
Tuesday, January 01, 2019
Kai ECT*

16. Results—Yield's Centrality depen.（pT bin）
Mid-Rapidity
Note the "kink"----
Melting Tempereature from
Color Screening
PRC89,054911(2014)
Tuesday, January 01, 2019
Kai ECT*

17. Results—RAA(pT) Forward Rapidity 1、Regeneration -- low pT
Initial high pT.
2、Competition leads to slightly "Valley" struture
3、The decreasing behavior indicates regeneration
PRC89,054911(2014)
Tuesday, January 01, 2019
Kai ECT*

18. Results—RAA(pT) "Valley" struture more clearly Mid-Rapidity
PRC89,054911(2014)
Tuesday, January 01, 2019
Kai ECT*

19. Results—Modification for Trans. pT: rAA
SPS: Cronin effect for
initial
RHIC: competition betw.
initial & regeneration
LHC: dominan regeneration
PRC89,054911(2014)
Nucl.Phys.A834,249C(2010)
Tuesday, January 01, 2019
Kai ECT*

20. Results—Modification for Trans. pT: rAA
hotter
Clearly showes
a hotter medium
been created at
LHC ! T
PRC89,054911(2014)
Nucl.Phys.A834,249C(2010)
Tuesday, January 01, 2019
Kai ECT*

21. Results—Modification for Trans. pT: rAA
1, sensitive to the degree
of heavy quark thermalization
--energy loss.
2, not sesitive to the cold
nuclear matter effect------
Shadowing effect.
clearly indicates QGP's medium
effects
PRC89,054911(2014)
Tuesday, January 01, 2019
Kai ECT*

22. Results—Eilliptic flow v2
1, remarkable v2 due to
important regeneration !
-->Refletc energy loss of heavy quark.
2, "Ridge"struture from two-component:
hard（initial、jet）
soft（regeneration、hydro）
3， v2 for high pT indicates B meson's thermalization
PRC89,054911(2014)
Tuesday, January 01, 2019
Kai ECT*

23. Thank you! Summary & Outlook cold? hot? not that hot "heavy quarkonia
cat"
a little hot
very hot !
Finite chemical potential 's effects, which is relavent for lower
energy case : FAIR
Event-by-event simulation for both open and hiden heavy mesons
Thank you!
Tuesday, January 01, 2019
Kai ECT*

24. Thank You！
Tuesday, January 01, 2019
Kai ECT*

25. Backup—Yield's Centrality depen.（pT bin）
Mid-Rapidity
Note the "kink"----
Melting Tempereature from
Color Screening
PRC89,054911(2014)
Tuesday, January 01, 2019
Kai ECT*

26. Backup—RAA(pT) "Valley" struture more clearly Mid-Rapidity
PRC89,054911(2014)
Tuesday, January 01, 2019
Kai ECT*

27. Backup-- Trans. pT: rAA 1, sensitive to the degree
of heavy quark thermalization
--energy loss.
2, not sesitive to the cold
nuclear matter effect------
Shadowing effect.
clearly indicates QGP's medium
effects
PRC89,054911(2014)
Tuesday, January 01, 2019
Kai ECT*

28. Transport Model- test of cold matter in p-Pb
p-Pb 5.02 TeV
Cronin + Shadowing(EKS98)
can describe the p-Pb(5.02
TeV) data well !
Tuesday, January 01, 2019
Kai ECT*

29. Transport Model- solution of transport equation
Both Initial production and Regeneration suffers Suppression
Tuesday, January 01, 2019
Kai ECT*

30. Results—Bottomonium differsV=U or V=F√
Tuesday, January 01, 2019
Kai ECT*

31. Transport Model- cold nuclear matter effects
Absorption
(so at LHC can safly be neglected)
Cronin
pT broadening (use Gaussian smearing)
@ LHC Pb-Pb 2.76TeV
Init.J.Mod.Phys.E.12,211(2003) Phys.Rev. C 73, (2006)
Tuesday, January 01, 2019
Kai ECT*

32. Transport Model- cold nuclear matter effects
Shadowing
for open & hiden heavy mesons
(2->1)process
Color Evaporation Model pp AA
R.Vogt et al. PRL91 (2003)
PRC71(2005)
Tuesday, January 01, 2019
Kai ECT*

33. Results—Bottomonium differsV=U or V=F√
Tuesday, January 01, 2019
Kai ECT*