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Heavy Ion Physics @ eRHIC

Heavy Ion Physics @ eRHIC. Jamal Jalilian-Marian Institute for Nuclear Theory University of Washington. DIS05, April 27 - May 1, Madison, WI, USA. QCD in Nuclei. Gluonic matter under extreme conditions Inclusive: F 2 , F L , xG, Semi inclusive/diffractive:

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Heavy Ion Physics @ eRHIC

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  1. Heavy Ion Physics @ eRHIC Jamal Jalilian-Marian Institute for Nuclear Theory University of Washington DIS05, April 27 - May 1, Madison, WI, USA

  2. QCD in Nuclei • Gluonic matter under extreme conditions • Inclusive: • F2 , FL , xG, • Semi inclusive/diffractive: • FD , vector meson production, … • Hadronization in the media, energy loss, pt broadening, … • …….

  3. The Search for Quark Gluon Plasma

  4. Gold-Gold Collisions at RHIC Suppression of single hadron production Disappearance of back to back correlations

  5. Deuteron-Gold Collisions at RHIC: mid-rapidity Medium effects overwhelm initial state effects Kinematics: xbj > 10-2 for pt > 2 GeV Nuclear structure functions measured in DIS Gluons are less constrained

  6. From mid to forward rapidity at RHIC Kinematics: Consider Mid rapidity: Forward rapidity RHIC: (similar to mid rapidity LHC)

  7. Modification of Gluons in Nuclei

  8. The Color Glass Condensate

  9. Consider large nucleus in the IMF frame: CGC: An Effective Theory of QCD at high energy One large component of the current-others suppressed by Wee partons see a large density of valence color charges at small transverse resolutions

  10. coupling of color charges to gluon fields The effective action Yang-Mills weight function for color charge configurations where MV:

  11. Bosons with large occupation # ~ - form a condensate • Typical momentum of gluons is Hadron/NUCLEUS at high energY is a Color Glass Condensate • Gluons are colored • Random sources evolving on time scales much larger than natural time scales-very similar to spin glasses Qs (x, A, bt ) >> LQCD

  12. Wilson RG at small x JIMWLK equations describe evolution of all N-point correlation functions of Wilson lines with energy (log 1/x) recover BFKL in the low density regime

  13. A New Paradigm of QCD Q2s/Q0 Qs Saturation region: dense system of gluons Extended scaling region: dilute system - anomalous dimension Double Log: BFKL meets DGLAP DGLAP: collinearly factorized pQCD

  14. Colliding Sheets of CGC at High Energies Initial energy and multiplicity of produced gluons depend on Qs Thermalization? Instabilities, ….

  15. adding final state effects: hydro, energy loss Colliding Sheets of CGC at High Energies

  16. From mid to forward rapidity at RHIC predictions by CGC: suppression (due to evolution in x) all others: enhancement !

  17. Hadron Production in dA at RHIC JJM KKT Caution: other models can now fit the data !

  18. p0 PT is balanced by many gluons “Mono-jet” Dilute parton system (deuteron) Dense gluon field (Au) Fixed as E & pT grows 25<Ep<35GeV 35<Ep<45GeV STAR preliminary Statistical errors only d-Au: two particle correlations pion pt increasing

  19. DIS Structure Functions similar relations for FL , FD, … applications to: DIS at HERA DIS on nuclei: NMC,…

  20. CGC at HERA ? Structure Functions diff/tot energy dependence Geometric Scaling Vector mesons

  21. Two Hadron Production in DIS two hadrons are far apart in rapidity: study correlations AGK + fans is violated, first known case !

  22. Summary • We may be probing small x QCD at RHIC • Mid Rapidity AA: • Multiplicities,… • Forward Rapidity dA: • Single inclusive hadron production • Two particle correlations • We need eRHIC: precision + kinematics • Independent, large lever arms in x, Q • Ability to vary energy: • FL (very sensitive probe of CGC) • Diffraction • …….

  23. CONCLUSIONS NEED eRHIC FOR A QUANTITATIVE UNDERSTANDING OF CGC MUST DISENTANGLE CGC AND QGP eRHIC IS ESSENTIAL FOR A QUANTITATIVE UNDERSTANDING OF QGP AT LHC

  24. EXTRA SLIDES

  25. Back to Back Correlations

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