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Universal Aspects of the Dipole Cross Section in eA and pA Collisions

Universal Aspects of the Dipole Cross Section in eA and pA Collisions. Jamal Jalilian-Marian Institute for Nuclear Theory University of Washington. Perturbative QCD. Quarks, gluons (x, Q 2 ) Weak coupling (  s << 1 ) Collinear factorization Universality Dilute systems.

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Universal Aspects of the Dipole Cross Section in eA and pA Collisions

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  1. Universal Aspects of the Dipole Cross Section in eA and pA Collisions Jamal Jalilian-Marian Institute for Nuclear Theory University of Washington

  2. Perturbative QCD • Quarks, gluons (x, Q2) • Weak coupling (s << 1) • Collinear factorization • Universality • Dilute systems

  3. Gluon Saturation • Small X/Large A • Large occupation number • Coherentstate • Saturation momentumQs (x)

  4. Semi-Classical QCD • Weak coupling (s << 1) • Classical fields + renormalization group • Coherence • Wilson lines (dipoles) • Dense systems

  5. Qes Qs • Color Glass Condensate Pt < Qs(y) • Color Quantum Fluid Qs(y) < Pt < Qes(y) • Dilute Parton Gas Pt >Qes(y) • RHIC, LHC,EIC

  6. QCD: Kinematic Regions • Color Glass Condensate • High gluon density • Strong classical fields • Non-Linear evolution: JIMWLK (BK at large Nc) • Color Quantum Fluid • Low gluon density • Linear evolution: BFKL • Anomalous dimension (kt factorization) • Dilute Parton Gas • Low gluon density • Linear evolution: DGLAP • Collinear factorization

  7. DIS:

  8. DIS Structure Functions

  9. Virtual Photon Production(F.G. + J.J-M. PRD67, 2003)

  10. Virtual Photon Production

  11. Dilepton Production in pA

  12. Models of Dipole Cross Section Golec-Biernat+Wusthoff Bartels+Golec-Biernat+Kowalski Iancu+Itakura+Munier

  13. Models of Dipole Cross SectionIancu, Itakura and Munier hep-ph/0310338

  14. Dilepton Production in dAJ.J-M nucl-th/0402014

  15. Dipoles and Hadron Production

  16. Forward Rapidity Hadron ProductionJ.J-M. nucl-th/0402080

  17. From RHIC To EIC • RHIC experimental coverage (Ex.: pt = 2 GeV) • y= 0 --> 4 • x1 ~ 10-2 --> 5x10-1 • x2 ~ 10-2 --> 10-4 • Limited pt coverage at large y • Convolution • EIC: the ultimate CGC machine • x, Q2 coverage • Luminasity • A dependence • FL, …

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