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Musings on Jet Medium Interaction Roy A. Lacey Chemistry Dept. Stony Brook University

Musings on Jet Medium Interaction Roy A. Lacey Chemistry Dept. Stony Brook University.      “Any man who knows all the answers most likely misunderstood the questions” Nancy Willard. Characteristics of the Medium Jet-medium interactions Extraction of jet functions

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Musings on Jet Medium Interaction Roy A. Lacey Chemistry Dept. Stony Brook University

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  1. Musings on Jet Medium Interaction Roy A. Lacey Chemistry Dept. Stony Brook University      “Any man who knows all the answers most likely misunderstood the questions” Nancy Willard • Characteristics of the Medium • Jet-medium interactions • Extraction of jet functions • Summary of few things learned

  2. t t = -z/c t = z/c eBjorken~ 5 - 15 GeV/fm3 ~ 35 – 100 ε0 0 z:collision axis Gold nucleus Gold nucleus v~0.99c “Thermalized” partonic Fluid! (s)QGP? A “little Bang” occurs in RHIC collisions How do we probe the properties this fluid? Roy A. Lacey, Stony Brook University; CATHIE-RIKEN Workshop, BNL Feb 25 - 26, 2009

  3. u Extraction of transport coefficients (η/s, q, cs, λ, etc) can lend decisive insight Accurate measurements are crucial! Roy A. Lacey, Stony Brook University; CATHIE-RIKEN Workshop, BNL Feb 25 - 26, 2009

  4. New RXN detector The non-flow “chicken” has come home to roost PHENIX Preliminary Event planes The case is now closed on issues of non-flow etc, via 5 separate measurements of v2 and v4 in the same experiment Roy A. Lacey, Stony Brook University; CATHIE-RIKEN Workshop, BNL Feb 25 - 26, 2009

  5. Baryons Mesons Phys. Rev. Lett. 98, 162301 (2007) KET – CQN Scaling Quark-Like Degrees of Freedom Evident Indication of strong coupling? Arguments which say that quark degrees of freedom can not be present are silly! Roy A. Lacey, Stony Brook University; CATHIE-RIKEN Workshop, BNL Feb 25 - 26, 2009

  6. KET and CQN Scaling for v4 PHENIX Preliminary KET & nq2 scaling validated for v4 Further Indication of strong coupling? Roy A. Lacey, Stony Brook University; CATHIE-RIKEN Workshop, BNL Feb 25 - 26, 2009

  7. Is this an indication that the partonic fluid is thermalized? Vn is universal Further Indication of strong coupling? a Related to η/s ? • Hints? • Hadronization? • 2. Partonic Thermalization? Roy A. Lacey, Stony Brook University; CATHIE-RIKEN Workshop, BNL Feb 25 - 26, 2009

  8. Better constrained estimates of coefficients PHENIX Preliminary λ = 0.3 – 0.35 Straightforward estimation of the degree of local equilibrium and η/s as a function of centrality! 10-15% larger than for fluid with η/s =1/4π in central events.

  9. High pT trigger Same-Side Jet x10 x20 Medium Response & Transport Coefficients QCD Sonic Boom Gives sound speed directly; Sets upper limit on viscosity. Roy A. Lacey, Stony Brook University; CATHIE-RIKEN Workshop, BNL Feb 25 - 26, 2009

  10. 2P & 3P correlation measurements? Strategy Compare jet correlations in pp & AA Collisions A B It is necessary to decompose flow and Jet correlations  Jet function ZYAM B Roy A. Lacey, Stony Brook University; CATHIE-RIKEN Workshop, BNL Feb 25 - 26, 2009

  11. The “’wisdom” of ZYAM! There are three methods to gaining wisdom. The first is reflection, which is the highest. The second is limitation, which is the easiest. The third is experience, which is the bitterest.” Confucius • Reflection • Based on a two source model • Two source models with similar • Input  same result. • Jets correlate [or/not] with event plane • Flow contributions dominate • Accurate determination of v2 required • Jet function (shape) is insensitive to ZYAM assumption • Limitations • Uncertainty in jet yields Roy A. Lacey, Stony Brook University; CATHIE-RIKEN Workshop, BNL Feb 25 - 26, 2009

  12. High pT trigger Same-Side Jet Assoc. pTs Deflected jet Mach Cone Away-Side Jet Validation test of the use of two event mixing to remove 2+1 processes (2+1) processes efficiently removed via two-event mixing to obtain true three particle correlations Roy A. Lacey, Stony Brook University; CATHIE-RIKEN Workshop, BNL Feb 25 - 26, 2009

  13. Di-jet correlation measurements? A B A B B Roy A. Lacey, Stony Brook University; CATHIE-RIKEN Workshop, BNL Feb 25 - 26, 2009

  14. Medium Response Modified Away-side topology is pT independent Roy A. Lacey, Stony Brook University; CATHIE-RIKEN Workshop, BNL Feb 25 - 26, 2009

  15. Medium Response “Particle composition” Composition of away-side jet similar to inclusive measurement Roy A. Lacey, Stony Brook University; CATHIE-RIKEN Workshop, BNL Feb 25 - 26, 2009

  16. Simulated Deflected jet Simulated Mach Cone True 3PC jet correlations QCD Sonic Boom? Data Total 3PC jet correlations Data compatible with the presence of a Mach Cone away-side jet Roy A. Lacey, Stony Brook University; CATHIE-RIKEN Workshop, BNL Feb 25 - 26, 2009

  17. simul Jet Suppression Simultaneous fits to IAA and RAA provide improved constraints Roy A. Lacey, Stony Brook University; CATHIE-RIKEN Workshop, BNL Feb 25 - 26, 2009

  18. Summary • A central goal of current relativistic heavy ion research is the extraction of the transport properties of the recently discovered sQGP. • Correlation measurements provide important constraints for a number of these properties • Scattering power • Sound speed • Sound attenuation • viscosity • etc. Roy A. Lacey, Stony Brook University; CATHIE-RIKEN Workshop, BNL Feb 25 - 26, 2009

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