1 / 19

Two and Three particle Flavor Dependent Correlations

Novel methods extract jet functions & flavors from correlations, revealing strong flavor dependence. Baryon/Meson ratios differ on near & away sides. Proton-antiproton yields show unique patterns. Comparison to simulations hints at Mach cone-like features.

eforeman
Download Presentation

Two and Three particle Flavor Dependent Correlations

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

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

  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, QM05

  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, QM05

  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, QM05

  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, QM05

  6. 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, QM05

  7. 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, QM05

  8. Flavor dependent near-side modification Meson vs. Baryon trigger Flavor dependent away-side modification in yield and shape N. N. Ajitanand, QM05

  9. For meson trigger with associated meson and baryon partners, similar modification observed N. N. Ajitanand, QM05

  10. 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, QM05

  11. 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, QM05

  12. 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, QM05

  13. “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!

  14. 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, QM05

  15. HHH Jet Only PHENIX Preliminary PHENIX Preliminary 20<cent<40 40<cent<60 N. N. Ajitanand, QM05

  16. 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, QM05

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

  18. 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

  19. 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

More Related