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Two and Three particle Flavor Dependent Correlations

Two and Three particle Flavor Dependent Correlations. N. N. Ajitanand Nuclear Chemistry, SUNY, Stony Brook For the PHENIX Collaboration. PRL87, 052301 (2001). Extrapolation From E T Distributions. peripheral collisions. Central collisions.

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Two and Three particle Flavor Dependent Correlations

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  1. Two and Three particle Flavor Dependent Correlations N. N. Ajitanand Nuclear Chemistry, SUNY, Stony Brook For the PHENIX Collaboration

  2. PRL87, 052301 (2001) Extrapolation From ET Distributions peripheral collisions Central collisions time to thermalize the system (t0 ~ 0.2 - 1 fm/c) Phase Transition: eBjorken~ 5 - 15 GeV/fm3 ~ 35 – 100 ε0 Pressure build up Flow Hard Scattering Jets High Energy density matter created at RHIC! Energy Density is Well Above the Predicted Value for the Phase Transition N. N. Ajitanand, ISMD05

  3. Jets are an ideal diagnostic probe for the medium: • Jets are Remarkable Probes for this High-density Matter • Auto-Generated on the right time-scale • Calibrated • Calculable (pQCD) • Accessible statistically via correlations in Au+Au N. N. Ajitanand, ISMD05

  4. pT mesons baryons The route to jets: Two Particle Azimuthal Correlations 200 GeV Au Au Leading Hadron • Associated particle • Meson • Baryon Baryon & Mesonidentification done using EMC TOF Correlation Function N. N. Ajitanand, ISMD05

  5. Meson-Meson (HighAsymmetry) Baryon-Baryon (Low Asymmetry) Flow anisotropy Jet asymmetry Flavor Dependent Correlations Strongly Flavor dependent Asymmetries and Anisotropies Observed in Two-Particle Correlations N. N. Ajitanand, ISMD05

  6. In-plane v2 extinction for constrained correlations Out-of-plane Constrain Leading Particle out of Reaction Plane within a constraint byte is given by : N. N. Ajitanand, ISMD05

  7. Unconstrained harmonic 1 (A) LP Constrained 2 (B) Decomposing the Flow and Jet signals Subtraction Extinction Phys. Rev. C 72, 011902 (2005) Two source model : Flow (H) & Jet (J) High pt particle constrained perpendicular to RP a0 is obtained without putting any constraint on the Jet shape by requiring Constraint byte i.e. Zero Yield At Minimum (ZYAM) Reliable decomposition of Flow and Jet Contributions achieved via two separate methods N. N. Ajitanand, ISMD05

  8. Simulation Test of Ansatz Blue line: input jet-function obtained from Tagging jet-particles in simulation Blue squares: Extracted jet-function Input jet extremely well recovered! N. N. Ajitanand, ISMD05

  9. Simulation Test of Ansatz: Unusual Jet shapes Robust Jet-extraction achieved! Input jet faithfully recovered even with unusual jet-shapes! N. N. Ajitanand, ISMD05

  10. Wake effect or “sonic boom” local min hep-ph/0411315 Casalderrey-Solana, Shuryak,Teaney nucl-th/0406018 Stoecker Correlations of Jets with flowing medium hep-ph/0411341 Armesto,Salgado,Wiedemann Subtracted jet-pair distributions (Folded into 0-p ) Significant Broadening and Strong Modification of away-side Jet observed! N. N. Ajitanand, ISMD05

  11. Decomposing the Flow and Jet signals Meson-Meson ZYAM subtracted J(Df) Flow extinguished C(Df) = J(Df) Both methods agree! Baryon-Meson Meson-triggered and Baryon-triggered J(Df) are different on near- and away-side! N. N. Ajitanand, ISMD05

  12. Flavor dependent near-side modification Meson vs. Baryon trigger Flavor dependent away-side modification in yield and shape N. N. Ajitanand, ISMD05

  13. For meson trigger with associated meson and baryon partners, similar modification observed N. N. Ajitanand, ISMD05

  14. Baryon number conservation in jet ? Proton vs anti-proton correlations Poster (A. Sickles) Near-side yield non-zero only for baryon-anti-baryon pairs N. N. Ajitanand, ISMD05

  15. hep-ph/0411315 Casalderrey-Solana,Shuryak,Teaney nucl-th/0406018 Stoecker Hep-ph/0503158 Muller,Ruppert Wake Effect or “sonic boom” nucl-th/0507063 Koch, Majumder, X.-N. Wang Cherenkov gluon radiation hep-ph/0411341 Armesto,Salgado,Wiedemann Correlation of Jet with flowing medium Possible modification of Jet-Topology N. N. Ajitanand, ISMD05

  16. Novel Method to unravel Jet-Topologies: Three-Particle Correlations For flow extinction: LP constrained relative to the reaction plane with Constraint byte DfC adjusted to extinction value. Poster (N. Ajitanand) Added topological information as compared to two particle correlations N. N. Ajitanand, ISMD05

  17. “Bent” Jet Note characteristic ridges: Mach cone or Cherenkov cone “Normal” Jet Mach cone Calibrating Three-Particle Correlations: Simulation Test Powerful Tool to distinguish between different scenarios!

  18. After Harmonic Extinction: PHENIX Preliminary Mach cone PHENIX Preliminary Simulation Flow+Jet Data indicates apparent cone structure for away-side jet! Data: Three-Particle Correlations 10%<cent<20% Flow+Jet Jet only N. N. Ajitanand, ISMD05

  19. HHH Jet Only PHENIX Preliminary PHENIX Preliminary 20<cent<40 40<cent<60 N. N. Ajitanand, ISMD05

  20. HHH 10<cent<20% PHENIX Preliminary PHENIX Preliminary PHENIX Preliminary 0.7<pt_assoc<1.0 0.5<pt_assoc<0.7 1.0<pt_assoc<2.5 N. N. Ajitanand, ISMD05

  21. PHENIX Preliminary PHENIX Preliminary Hadron-Baryon-Baryon Hadron-Meson-Meson Strong flavor Dependence observed

  22. peak Hadron meson meson valley Hadron baryon baryon Away peak PHENIX Preliminary PHENIX Preliminary Ridge axes HBB Flatter than HMM Away Peak around 2 Radians Hadron Hadron Hadron Peak/Valley on ridge Axis Away Peak Position on Diagonal Axis

  23. Ridge axes Hadron-Hadron-Hadron Bending Jet simulation Cherenkov Jet simulation data Ridge peak to valley ratio

  24. Extinction method on two particle correlations Polar plot wrt leading particle axis LP Express associated particle direction as theta,phi in frame with leading particle vector as z-axis Plot theta along radial axis Plot phi along azimuthal axis N. N. Ajitanand, ISMD05

  25. Cherenkov only in full acceptance The Polar view Flip away-side Cherenkov Simulation Cherenkov only in PHENIX N. N. Ajitanand, ISMD05

  26. Summary Novel methodologies developed to remove Harmonic contributions and extract jet functions from Azimuthal Correlation functions. Jet function and yields show strong dependence on particle flavor • Away side baryon/meson ratio 2X larger than near side • baryon/meson ratio • Proton anti-proton yields non-zero only on near side The jet landscape for three particle correlations obtained as a function of Centrality, pt and flavor • Hadron Baryon Baryon jet-scape flatter than Hadron Meson Meson • Comparisons to simulations indicate “Mach cone” like features in • Jet land-scape for wide range of pT and centralities • Cone angle possibly related to sound speed, refractive • index … etc

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