Transcript Open Charm and Charmonium Production at RHIC Ming X. Liu

Open Charm and Charmonium
Production at RHIC
Ming X. Liu
Los Alamos National Laboratory
(PHENIX Collaboration)
- p+p (polarized)
- d+Au
s NN  200GeV
- Au+Au
Moriond04 3/28-4/5 2004
Ming X. Liu
QGP and J/Psi Suppression in Pb-Pb at NA50
H. Santos, "Psi' production in nucleusnucleus collisions at the CERN/SPS". QM04
A. Capella, D. Sousa, nucl-th/0303055
A.P.Kostyuk, M.I. Gorenstein, H.
Stocker, W. Greiner, Phys. Lett B 531,
195-202
•Suppression with respect to normal nuclear suppression expectations
•Alternative models:
•Statistical coalescence model (enhanced open charm)
•Hadron gas comovers
QGP Debye
•RHIC data on J/Y and Open Charm from pp, dAu to AuAu
Screening
- “cold” & “hot” medium
Moriond04 3/28-4/5 2004
Ming X. Liu
Charm Production – Probing QGP
~90%
•
J/Psi production
–
QGP Debye Screening & J/Psi
suppression
d J / Y  f ( x1 )  f ( x2 )  dˆ x1  x2 cc  Dcc J / Y X
–
–
–
–
Thermal production
Coalescence models
Initial & final state interactions
Production mechanism
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•
•
CSM,COM,CEM
Polarization
Open charm
–
–
–
–
d-Au: Cold?
Baseline for J/Psi
Gluon structure function
Nuclear medium effects
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Au-Au: Hot?
Light vs Heavy
Binary scaling in dAu,AuAu
p-p: QCD reference
QGP signal: open charm
enhancement?
Moriond04 3/28-4/5 2004
Ming X. Liu
e  : |  | 0.35
  : 1.2 |  | 2.4
PHENIX
e,  , K , p : |  | 1
STAR
Run I, 2001
Au-Au beams at s=130 GeV
•Open charm from PHENIX
Run II, 2002
Au-Au beams and p-p at s=200 GeV
•Open charm and J/Y from PHENIX
Run III, 2003
d-Au, p-p at s=200 GeV
•Open charm from PHENIX and STAR, J/Y from PHENIX
Run IV, 2004
Au-Au, s=200 GeV
Moriond04 3/28-4/5 2004
•More measurements to come
Ming X. Liu
Open Charm at RHIC
K

• Single electrons measured at y~0
• D mesons (STAR) |y|<1.0
• High Pt muons (PHENIX) |y|~ 1-2
PHENIX Preliminary

D0
c
K

c
D0

0 < pT < 3 GeV/c, |y| < 1.0
d+Au minbias
D0+D0
Moriond04 3/28-4/5 2004
Ming X. Liu
Open Charm Production in QGP
• Threshold effect
d D  f ( x1 )  f ( x2 )  dˆ x1  x2 cc  Dcc D X
• Thermal production
QGP
s
A. Kostyuk, M. Gorenstien, W. Greiner. hep-ph/0103057
Moriond04 3/28-4/5 2004
Ming X. Liu
Nucleon Binary Scaling
• pp, dAu, AuAu MinBias
PHENIX Preliminary
pp
Moriond04 3/28-4/5 2004
Ming X. Liu
Open Charm @ y~0
• Scales with number of
nucleon binary collisions
in d+Au & Au+Au @ y ~0
RAB
d 2 AB / dpT dy

 N coll  d 2 pp / dpT dy
STAR Preliminary
dAu
Au+Au
AuAu
Beauty
decay
PHENIX Preliminary
d+Au
Moriond04 3/28-4/5 2004
Ming X. Liu
Physics @ large rapidity
• Different “x” range:
initial state
– (anti)shadowing/CGC
M y
x
e
s
• Final state scattering:
energy dependent
θ
Eskola, Kolhinen, Vogt hep-ph/0104124
~10 GeV
C.M.F.
pT  pT
pz    E (cos    )
Au rest frame
~1000 GeV
Moriond04 3/28-4/5 2004
Ming X. Liu
Open charm at large rapidity
• Gluon saturation/CGC
y ~ 0 : d  N coll
dAu
y ~ 2 : d  N part
y ~ 0 : d  N coll
y ~ 2 : d  N part
• PHENIX forward
muons 1.2 | y | 2.4
D. Kharzeev & K. Tuchin
hep-ph/0310358
MC
AuAu
Moriond04 3/28-4/5 2004
Ming X. Liu
J/Psi production at RHIC: pp & dAu
BR x pp = 159 nb ± 8.5 % (fit) ± 12.3% (abs)
Moriond04 3/28-4/5 2004
Ming X. Liu
pT Broadening
J/Y  +J/Y  +-
High x2 ~ 0.09
Low x2
~ 0.003
<T2> = <pT2>dAu – <pT2>pp = 1.77 ± 0.35 GeV (1.29 ± 0.35 GeV)
Moriond04 3/28-4/5 2004
Ming X. Liu
J/Psi @ large rapidity in dAu
• Gluon (anti)shadowing
• Final state interactions
d 2 dA / dpT dy
RdA 
 N coll  d 2 pp / dpT dy
Collision centrality
Moriond04 3/28-4/5 2004
Ming X. Liu
More on Nuclear medium effects
RCP
dN central / dydpT /  N coll 

dN 6088% / dydpT /  N coll 
(00-20%)/(60-88%)
d
← Au
Moriond04 3/28-4/5 2004
Ming X. Liu
J/Psi in AuAu (2002 Run)
PHENIX
R. L. Thews, M. Schroedter, J. Rafelski,
Phys Rev C 63, 054905
Plasma Coalescence Model
Binary Scaling
Absorption (Nuclear + QGP) + final-state
coalescence
Absorption (Nuclear + QGP)
L. Grandchamp, R. Rapp, Nucl Phys
A709, 415; Phys Lett B 523, 60
Moriond04 3/28-4/5 2004
Ming X. Liu
J/Psi from 2004 run (AuAu)
1.2 | y | 2.4 : J / Y     
| y | 0.35 : J / Y  e  e 
J / Y    
Moriond04 3/28-4/5 2004
Ming X. Liu
Summary and Outlook
• Open charms
– pp, dAu, AuAu @y=0
– Follows binary scaling at high Pt
– Large rapidity – work in progress
PHENIX Preliminary
• J/Psi
– pp, dAu, AuAu
– Observed cold nuclear medium effect
• Rapidity
• Centrality
• High statistics AuAu data available soon
– Open charm and J/Psi
– Central and forward rapidity
Moriond04 3/28-4/5 2004
Ming X. Liu