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Measurement of v 2 and v 4 in Au+Au Collisions at different beam energy from PHENIX

Shengli Huang for PHENIX Collaboration Vanderbilt University. Measurement of v 2 and v 4 in Au+Au Collisions at different beam energy from PHENIX. Outline. 1. Physics motivations 2. The analysis methods 3. The v 2 measurements from PHENIX 4. The v 4 measurements from PHENIX

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Measurement of v 2 and v 4 in Au+Au Collisions at different beam energy from PHENIX

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  1. Shengli Huang for PHENIX Collaboration Vanderbilt University Measurement of v2 and v4 in Au+Au Collisions at different beam energy from PHENIX

  2. S. Huang Outline • 1. Physics motivations • 2. The analysis methods • 3. The v2 measurements from PHENIX • 4. The v4 measurements from PHENIX • 5. Summary and Outlooks

  3. S. Huang Physics motivation (1) RHIC data indicates the partonic collectivity has been generated at RHIC. Viscous hydro-dynamics calculations with a small value of η/sis compatible with v2 measurements Beam energy scan will search for the collision energy where the partonic matter starts to turn off η/s = 0.08 CGC η/s = 0.16 Glauber M. Luzum, J-Y Ollitrault, Phys.Rev.C82:014906,2010

  4. S. Huang Physics motivation (2) • The differential v2 saturates at RHIC energy from 62.4 GeV to 200 GeV • Softening of equation of state • Locate the collision energy for the critical point searching • To measure the v2 and v4 in same rapidity for the same collision system will supply better information for extracting collision energy dependence Phys.Rev.Lett.94:232302,2005.

  5. S. Huang Physics motivation (3) • v4/v22 is sensitive to the η/s and the freez-out temperature • Simultaneous measurements of differential v2 and v4 are important for extraction of transport properties Gombeaud & J-Y.Ollitrault, PRC 81,014901(2010) Luzum, &,J-Y. Ollitrault, PRC 81,054910(2010) Phys. Rev. Lett. 105, 062301 (2010)

  6. PHENIX Detectors for Event Plane • Event plane detectors: • Reaction plane detector • RXNIN (1.5<||<2.8) • RXNOUT (1.0<||<1.5) • Muon position EMCal • MPC (3.1<||<3.9) • Beam-beam counter • BBC (3.1<||<3.9) • Large η gap away central arm |η|<0.35 • Systematic study the non-flow effect for the measurement of v2 and v4 S. Huang 6

  7. S. Huang The event plane Resolution σRP for v2, Au+Au at 7.7 GeV

  8. S. Huang Robust Measurements The measurements from different event plane detectors are consistent quite well

  9. S. Huang The Energy dependence of v2 (1) There is no energy dependence of v2(pT) for collision energy from 39 GeV to 200 GeV for different collision centrality bins

  10. S. Huang The Energy dependence of v2 (2) The v2 at 7.7 GeV Au+Au is much lower than v2 of 39 GeV, 62.4 GeV and 200 GeV Partonic flow -- Hadronic flow ?

  11. S. Huang The Baryon contribution Proton yield dominates in the positive hadrons, while pion yield dominates in the negative hadrons The v2 of negative hadron at 7.7 GeV Au+Au is lower than v2 of pion at 200 GeV AuAu

  12. S. Huang The Energy dependence of v4 (1) Similar to v2, the v4 does not show energy dependence for collision energy from 39 GeV to 200 GeV

  13. S. Huang The Energy dependence of v4 (2) At mid-centrality, the v4/v22 is around 0.8 as a function of pT in Au+Au collision from energy 39 GeV to 200 GeV The v4/v22 is similar from 39 GeV to 200 GeV at different Npart in Au+Au collisions

  14. S. Huang Summary and outlooks • 1. The v2 measurement from PHENIX further indicates that the v2 saturates from 39 GeV to 200 GeV, but larger than the v2 of 7.7 GeV in AuAu collision • 2. The v4 also saturates from 200 GeV to 39 GeV and the v4/v22 is almost constant from 39 GeV to 200 GeV • 3. These results will supply new information for comparison with results from viscous hydro-dynamics models. It will also shed light on the path for further research on the critical point • 4. The PID v2 and v4 results from PHENIX will be out soon

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