quarkonium formation from heavy quark recombination formation from heavy quark recombination
DESCRIPTION
R. L. THEWS UNIVERSITY OF ARIZONA PHENIX-MUON WORKSHOP SANTA FE JUNE 13, 2005. QUARKONIUM FORMATION FROM HEAVY QUARK RECOMBINATION FORMATION FROM HEAVY QUARK RECOMBINATION. QUARKONIUM FORMATION. MATSUI-SATZ: : R plasma screening < R quarkonium : SUPPRESSION - PowerPoint PPT PresentationTRANSCRIPT
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QUARKONIUM FORMATION FROM HEAVY QUARK RECOMBINATION FORMATION FROM HEAVY QUARK RECOMBINATION
R. L. THEWS
UNIVERSITY OF ARIZONA
PHENIX-MUON WORKSHOP
SANTA FE
JUNE 13, 2005
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QUARKONIUM FORMATION
MATSUI-SATZ:: Rplasma screening < Rquarkonium : SUPPRESSION
KHARZEEV-SATZ: Ionization with deconfined gluons
NA50: Anomalous Suppression
ALTERNATIVES: Dense hadronic medium, comovers
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Multiple ccbar pairs in high energy AA Collisions
10-15 from extrapolation of low energy 20 from PHENIX electrons 40 from STAR electrons and K
( 0) 30 ( ) ppcc ccN b mb
CENTRAL VALUES:
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PROBE REGION OF COLOR DECONFINEMENT WITH
MULTIPLE PAIRS OF HEAVY QUARKS
Avoids Matsui-Satz Condition
Form Quarkonium directly in the Medium
Formation and Suppression Competition
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IF THE INCOHERENT RECOMBINATION OF HEAVY QUARKS DETERMINES FINAL HADRONIC ABUNDANCES:
,
2
Probability for charm quark to combine with anticharm:
/ /
Since << 1, sum for each c:
/
Average over fluctuations:
/ ( 1) /
Centrality dependence in
c u d cc ch
quarkonium cc ch
cc cc ch
N N N N
N N N
J N N N
13
p
1
1
terms of participants N :
Parameterize ,
/ / ( )
ch p
cc p p
N N
J N binary aN bN
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FORMATION CENTRALITY SIGNATURES
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FORMATION OF QUARKONIUM IN REGION OF COLOR DECONFINEMENT
Formation process is Inverse of dissociation
Model evolution of region with initial temperature and isentropic expansion, depends on contours of participant density
Final population determined by competition between formation and dissociation rates
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D
k
k
32
3 6
2 12
20
1 2
03 2
05
/ /( / )
( / )
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dN
dv N v N
J
F c c D g J
/
/
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d ) ( )V(
cc )( )( ][NN
1-
F
2
ffJ/0
f
] exp[- ) ( gD
0
d
J/Psi yield is Quadratic in Total Charmis:
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COMPARISON WITH INITIAL PHENIX DATA AT RHIC 200
Rates very sensitive to quark momentum distribution
Centrality signature varies with magnitude of Ncc
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PHENIX – Phys. Rev. C69, 014901 (2004)
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Kinetic Model
Statistical
Model predictions very sensitive to Ncc and distribution
Therm+Form
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M. Mangano and R. L. Thews: Nucl-th/0505055
1. Generate sample of ccbar pairs from NLO pQCD (smear LO qt)
2. Supplement with kt to simulate initial state and confinement effects
3. Integrate formation rate using these events to define particle distributions (no cquark-medium interaction)
4. Repeat with cquark thermal+flow distribution (maximal cquark-medium interaction)
DO THE Y AND PT SPECTRA PROVIDE A FORMATION SIGNATURE?
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/ /3 3
1 1/ /
( )
( )
cc ccN NJ i j J
reli jJ J
d N d p p p Xd tv
d p V t d p
•All combinations of c and cbar contribute
•Total has expected (Nccbar)2 / V behavior
•Prefactor is integrated flux per ccbar pair
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p-p data “select” unbiased diagonal c-cbar pairs
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2 20.5 0.1c quarksk GeVt
p-p data determine intrinsic kt
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Use dAu broadening to determine nuclear kt2 2 1.3 0.3 GeVt AAk
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S. Gavin and M. Gyulassy, Phys. Lett. B214 (1988)
2 2 2{ 2}T AB T pp A Bp p n n
Nuclear broadening from Initial state parton scattering, extract 0.35 +/- 0.14 GeV2 for Au-Au at RHIC, compare with 0.12 +/- .02 GeV2 at fixed-target energy
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Formation through “off-diagonal” pairs narrows rapidity distribution
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Formation through “off-diagonal” pairs narrows pt distribution
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Comparison with Thermal + Transverse Flow c-Quark Distributions
max max
0 120
sinh( ) cosh( )[ [ ]
R T T T T
TT
r rp y m ydN R Rm r dr I K
dp T T
K.A.Bugaev, M. Gazdzicki, M.I.Gorenstein, Phys.Lett.B544,127(2002)
S.Batsouli, S.Kelly, M.Gyulassy, J.L.Nagle, Phys.Lett.B557,26 (2003)
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Comparison with coalescence model: V Greco, C. M. Ko, R. Rapp, Phys. Lett. B595:202 (2004)
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Absolute magnitude and centrality dependence tests require both open and hidden flavor measurements
J/Psi pT and y provide signatures of kinetic recombination process
Charm quark pair spectra different for diagonal and off-diagonal combinations
Non-monatonic behavior of widths of transverse momentum spectra signal recombination
In-medium formation process very sensitive to heavy quark thermalization and flow
SUMMARYSUMMARY