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Single & Dihadron Suppression at RHIC and LHC

Last call for prediction for LHC, CERN, May 29-June 2,2007. Single & Dihadron Suppression at RHIC and LHC. Xin-Nian Wang Lawrence Berkeley National Laboratory. Collaborators: J. Owens, E. Wang, Z. Zhang, Phys. Rev. Lett. 98, 21230 (2007) [nucl-th/0701045]. Outline.

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Single & Dihadron Suppression at RHIC and LHC

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  1. Last call for prediction for LHC, CERN, May 29-June 2,2007 Single & Dihadron Suppression at RHIC and LHC Xin-Nian Wang Lawrence Berkeley National Laboratory Collaborators: J. Owens, E. Wang, Z. Zhang, Phys. Rev. Lett. 98, 21230 (2007) [nucl-th/0701045]

  2. Outline • Jet quenching in twist expansion framework • Single and dihadron suppression at RHIC and LHC • A roadmap for jet study at LHC

  3. Jet Quenching in A+A Collisions leading particle hadrons q q hadrons leading particle Leading particle suppressed hadrons q q hadrons N-N collision A-A collision leading particle suppressed

  4. Alphabets of jet quenching • Gyulassy-Levai-Vitev (GLV) • (Djordjevic, Wicks, Horowitz, …) • Armesto-Salgado-Wiedeman (ASW) • (Dainess et al, Arleo, Renk, Eskola, …) • Arnold-Moore-Yaffe (AMY) • High-Twist Expansion (THE)(XNW, Guo, Majumder, Osborne, Owens, E. Wang, B. Zhang, H. Zhang,…) Comparative study of jet quenching schemes; A. Majumder QM06 (nucl-th/0702066 )

  5. Jet Quenching in High-Twist Expansion

  6. Gluon distribution of the medium

  7. pT broadening and gluon distribution k=E q p

  8. Elastic Energy Loss +…. + +

  9. Elastic vs. Radiative Energy Loss For E=10 GeV, T=0.2 GeV, L=6 fm, as=0.3

  10. Quark-quark Scattering arXiv:0704.0106 [hep-ph] Schafer, XNW and B.Zhang, Gluon –parton scattering Coupled equation for modified fragmentation functions for Quarks and gluons

  11. NLO pQCD Calculation 1-D expanding Transport coefficient Energy loss parameter Geometry: Hard Sphere: Good approximation to Wood-Saxon

  12. Single and Dihadron hadron suppression at RHIC zT=pTass/pTtrig

  13. Sensitivity to initial density

  14. Surface emission?

  15. Surface vs. Volume

  16. Multiplicity at LHC 2dN/dh/Npart=10-12

  17. Parton Shadowing at LHC

  18. Single hadron suppression at LHC

  19. Dihadron suppression at LHC

  20. Dihadron suppression at LHC

  21. A roadmap for jet study at LHC Re-constructed jets open up a whole new world for jet quenching study (I always believe what my experimental colleagues tell me) • Reconstructed jets: • Single inclusive jets • Di-jets • Gamma-jets

  22. (1) Measurements of jet shape 1 Jet cone size R • RAA(ET) for jets: RAA For single hadrons

  23. (2) Direct measurement of qhat g J. Casalderrey-Solana and XNW, arXiv:0705.1352 [hep-ph]. Majumder, Muller and XNW, arXiv:hep-ph/0703082

  24. q-hat in a nucleus e- E. Wang & XNW PRL 89, 162301(2002)

  25. (3) Modified fragmentation functions XNW, Huang and Sarcevic, Phys.Rev. Lett. 77, 231 (1996)

  26. Utopia?

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