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IN-MEDIUM FORMATION OF QUARKONIUM (“RECOMBINATION”)

R. L. THEWS UNIVERSITY OF ARIZONA SQM2006 UCLA MARCH 26-31, 2006. IN-MEDIUM FORMATION OF QUARKONIUM (“RECOMBINATION”). IN-MEDIUM FORMATION. HIGH ENERGY EVOLUTION OF MATSUI-SATZ: R plasma screening < R quarkonium SUPPRESSION in a static medium, or

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IN-MEDIUM FORMATION OF QUARKONIUM (“RECOMBINATION”)

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  1. R. L. THEWS UNIVERSITY OF ARIZONA SQM2006 UCLA MARCH 26-31, 2006 IN-MEDIUM FORMATION OF QUARKONIUM (“RECOMBINATION”)

  2. IN-MEDIUM FORMATION HIGH ENERGY EVOLUTION OF MATSUI-SATZ: Rplasma screening < 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

  3. Multiple ccbar pairs in high energy AA Collisions • 10-15 from extrapolation of low energy • 20 from PHENIX electrons • 40 from STAR electrons and Kp CENTRAL VALUES AT RHIC: AND AT LHC: 100-200??

  4. 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 Scenario supported by lattice calculations of quarkonium spectral functions (J/y and hc)

  5. IF THE INCOHERENT RECOMBINATION OF HEAVY QUARKS DETERMINES FINAL HADRONIC ABUNDANCES:

  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. IF THE INCOHERENT RECOMBINATION OF HEAVY QUARKS DETERMINES FINAL HADRONIC ABUNDANCES: IN-MEDIUM FORMATION R. L. Thews, M. Schroedter, J. Rafelski, Phys. Rev. C63 (2001) 054905 [hep-ph/0007323]. L. Grandchamp, R. Rapp, Phys. LettB52360 (2001) [hep-ph/0103124]. L. Grandchamp, R. Rapp, G. E. Brown Phys Rev Lett 92, 212301 (2004).

  8. Suppression of Initially Produced J/y

  9. Continuous In-Medium Formation followed by Partial Suppression

  10. Model predictions very sensitive to Ncc and distribution Kinetic Model Statistical Therm+Form

  11. Model predictions very sensitive to Ncc and distribution +

  12. CAN Y AND PT SPECTRA 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 thermal+flow distribution (maximal cquark-medium interaction)

  13. All combinations of c and cbar contribute • Total has expected (Nccbar)2 / V behavior • Prefactor is integrated flux per ccbar pair

  14. PT distribution shows minimal variation with y interval

  15. p-p data “select” unbiased diagonal c-cbar pairs

  16. p-p data determine intrinsic kt

  17. 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)

  18. Formation through “off-diagonal” pairs narrows rapidity distribution

  19. Formation through “off-diagonal” pairs narrows pt distribution

  20. Comparison with Thermal + Transverse Flow c-Quark Distributions 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)

  21. Comparison with coalescence model: V Greco, C. M. Ko, R. Rapp, Phys. Lett. B595:202 (2004)

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