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KINETIC MODEL RESULTS FOR HEAVYQUARK COALESCENCE

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Rplasma screening Rquarkonium SUPPRESSION in a static medium, or ... (Blast Wave) K.A.Bugaev, M. Gazdzicki, M.I.Gorenstein, Phys.Lett.B544,127(2002) ... – PowerPoint PPT presentation

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Title: KINETIC MODEL RESULTS FOR HEAVYQUARK COALESCENCE


1
KINETIC MODEL RESULTS FOR HEAVY-QUARK COALESCENCE
  • R. L. THEWS
  • UNIVERSITY OF ARIZONA
  • Characterization of the Quark Gluon Plasma with
    Heavy Quarks
  • 25-28 JUNE 2008
  • Physikzentrum Bad Honnef

2
IN THE BEGINNING
THERE WERE MATSUI SATZ
3
IN-MEDIUM FORMATION(REGENERATION)
  • HIGH ENERGY EVOLUTION OF MATSUI-SATZ
  • Rplasma screening lt Rquarkonium SUPPRESSION in
    a static medium, or
  • KHARZEEV-SATZ Ionization with deconfined gluons
  • Charm pair diffuse away, will not recombine
    during deconfinement phase or at hadronization
  • NEW SCENARIO AT COLLIDER ENERGIES

4
Multiple ccbar pairs in high energy AA Collisions
CENTRAL VALUES AT RHIC
  • 10-15 from extrapolation of low energy
  • 20 from PHENIX electrons
  • 40 from STAR electrons and Kp

AND AT LHC 100-200??
5
PROBE REGION OF COLOR DECONFINEMENT WITH MULTIPLE
PAIRS OF HEAVY QUARKS
  • Two Distinct Physical Scenarios
  • Form Quarkonium in the Medium, where it competes
    with Suppression, and/or
  • (2) Form Quarkonium during the Hadronization
    Transition

6
QUARKONIUM FORMATION MODELS IN REGION OF COLOR
DECONFINEMENT
  • STATISTICAL HADRONIZATION
    P. Braun-Munzinger, J. Stachel, Phys. Lett B490
    (2000) 196 nucl-th/0007059.
  • KINETIC IN-MEDIUM FORMATION
    R. L. Thews, M. Schroedter, J. Rafelski, Phys.
    Rev. C63 (2001) 054905 hep-ph/0007323.

7
COLOR DECONFINEMENT ALLOWS THE INCOHERENT
RECOMBINATION OF ALL PAIRS OF HEAVY QUARKS
8
MANY THEORETICAL INPUT PARAMETERS
9
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11

Gold-plated signature for Regeneration
SEARCH FOR J/PSI with xF gt 1
12
OFF-DIAGONAL PAIRS POPULATE X_F gt 1.0
13
FORMED J/PSI ALSO POPULATES X_F gt 1.0
14
THE P_T DISTRIBUTION IS PEAKED NEAR ZERO
15
BUT THEY ONLY APPEAR NEAR THE RAPIDITY BOUNDARY
16
CAN Y AND PT SPECTRA ALONE PROVIDE
SIGNATURES OF IN-MEDIUM FORMATION?
R. L. Thews and M. L. Mangano Phys. Rev. C73,
014904 (2006) nucl-th/0505055
  • Generate sample of ccbar pairs from NLO pQCD
    (smear LO qt)
  • Supplement with kt to simulate initial state and
    confinement effects
  • Integrate formation rate using these events to
    define particle distributions (no cquark-medium
    interaction)
  • Repeat with cquark thermalflow distribution
    (maximal cquark-medium interaction)

17
  • All combinations of c and cbar contribute
  • Total has expected (Nccbar)2 / V behavior
  • Prefactor is integrated flux per ccbar pair
  • Do the J/Psi spectra retain a memory of the
    underlying charm quark spectra?

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20

No REGENERATION FOR pp?J/Psi, DIAGONAL PAIRS
ALONE SHOULD FIT SPECTRA
21

22

EXTRACT ALLOWED ltkT2gt .75 GeV2
23

DIAGONAL PAIRS NO EXTRA PARAMETERS
24
Use dAu broadening to determine nuclear kt
(Minimum Bias)
25
Central rapidity data exhibits anti-broadening!
26
Proceed with analysis for muon data only
Collision numbers nbar correlated with centrality
Nuclear broadening from Initial state parton
scattering, extract l2 0.56 /- 0.08 GeV2 for
Au-Au at RHIC, compare with 0.12 /- .02 GeV2 at
fixed-target energy. Note l and n are
correlated within given nuclear geometry.
S. Gavin and M. Gyulassy, Phys. Lett. B214 (1988)
27

Initial lambda estimate disfavors Direct
Production
28

Revised lambda value allows 100 Direct Production
29

Regeneration is almost independent of centrality
and lambda , and magnitude consistent with
initial PHENIX data.
30
Comparison with Thermal Transverse Flow c-Quark
Distributions (Blast Wave)
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)
31
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Determine fraction of regeneration using y0 data
38

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Consider combination of Direct and Regeneration
(pQCD) with weights (1-a) and a, match data at
y 0
42

Predict pT Spectra which are in agreement with
Data
43

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46
Comparison with coalescence model V Greco, C. M.
Ko, R. Rapp, Phys. Lett. B595202 (2004)
47
WHERE IS FORMATION FROM THERMAL CHARM?
48
SUMMARY
  • In-Medium Formation (AKA regeneration,
    coalescence, recombination) as a mechanism for
    J/y production in central Au-Au at RHIC must
    reflect the underlying charm quark distributions.
  • We find that normalized pT and y spectra alone
    can provide signatures of in-medium formation,
  • independent of the absolute magnitude of
    recombination processes. We show that variation
    of ltpT2gt with centrality provides characteristic
    signals.
  • Baseline tests using pp and pA collisions
    provides a connection with initial pQCD charm
    quark
  • distributions.

49
  • Centrality dependence and shapes of spectra
  • are consistent with a 10 20 fraction
    produced in-medium from recombination of pQCD
    charm quarks.
  • PHENIX measurements of y spectra in AA
  • collisions now exhibit some narrowing as
    predicted for in-medium formation.
  • pT spectra do not indicate an obvious
    contribution from recombination of thermalized
    charm
  • Robust predictions require complete set of
    constraints from pp and pA.
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