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STAR Physics at RNC Nu Xu Nuclear Science Division Lawrence Berkeley National Laboratory

STAR Physics at RNC Nu Xu Nuclear Science Division Lawrence Berkeley National Laboratory. (1) Introduction (2) Selected recent results - partonic collectivity, coalescence, di-jets (3) Plan for FY09 - 11 - collective velocity, full jet reconstruction, direct radiation.

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STAR Physics at RNC Nu Xu Nuclear Science Division Lawrence Berkeley National Laboratory

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  1. STAR Physics at RNCNu XuNuclear Science DivisionLawrence Berkeley National Laboratory (1) Introduction (2) Selected recent results - partonic collectivity, coalescence, di-jets (3) Plan for FY09 - 11 - collective velocity, full jet reconstruction, direct radiation DOE Review, May 13th, 2008

  2. STAR Heavy Ion Physics 1) RHIC heavy-ion program - Study medium properties and pQCD in hot and dense medium 2) RHIC energy scan - Search for QCD critical point DOE Review, May 13th, 2008

  3. STAR Detectors EMC+EEMC+FMS (-1 ≤  ≤ 4) TPC TOF DAQ1000 HFT FGT Full azimuthal particle identification! DOE Review, May 13th, 2008

  4. STAR: PRL. 98 (2007) 062301; nucl-ex/0703033 -mesons from Au+Au Collisions ssbar fusion -meson formation! STAR: Phys. Lett. B612, 81(2005) The observed strangeness enhancement is NOT due to the Canonical suppression! STAR: Preliminary DOE Review, May 13th, 2008

  5. Charm Cross-section d(cc)/dy at RHIC Within error bars, Nbin-scaling is observed! Large systematic uncertainties Theory under predict d(cc)/dy at RHIC: STAR ~ 2 x PHENIX 5) HFT upgrade important DOE Review, May 13th, 2008

  6. Anisotropy Parameter v2 coordinate-space-anisotropy  momentum-space-anisotropy y py px x Initial/final conditions, EoS, degrees of freedom DOE Review, May 13th, 2008

  7.  -meson Flow: Partonic Flow “-mesons are produced via coalescence of seemingly thermalized quarks in central Au+Au collisions. This observation implies hot and dense matter with partonic collectivity has been formed at RHIC” STAR: Phys. Rev. Lett. 99 (2007) 112301// * STAR, Duke, TAMU, DOE Review, May 13th, 2008

  8. Eccentricity Scaling (?) STAR: PRC, in print, arXiv:0801.3466v1 200 GeV Au+Au S. Voloshin, A. Poskanzer, PL B474, 27(00). D. Teaney, et. al., nucl-th/0110037 • Larger v2/part indicates stronger flow in more central collisions. • Clearly, no part scaling. • The observed nq-scaling does not necessarily mean thermalization. DOE Review, May 13th, 2008

  9. STAR, PRL 97, 162301 (2006) Zhang, Owens, Wang and Wang PRL 98, 212301 (2007) Di-hadron Correlations at High pT pTtrigger>8 GeV/c Yield per trigger Di-hadron correlations results allow quantitative measure for jet quenching  Parameter for energy loss. DOE Review, May 13th, 2008

  10. The Ridge: Medium Response Ridge Jet Bulk Medium Rich underlying physics: jet, bulk, jet-medium interaction, medium responses,… N. Armesto et al.;R. Hwa; A. Majumder, et al.; E. Suryak; S. Voloshin; C.Y. Wong DOE Review, May 13th, 2008

  11. Results Summary Study medium properties via (i) penetrating probes, jets and heavy flavor; (ii) bulk measurement, collective flow and yields; (iii) multi-particle correlations. • Strong collective flow with partonic degrees of freedom - detailed studied underway to extract collective velocity parameters - future HFT will help to address issues of thermalization at RHIC • Jet and medium correlations - detailed study of three-particle correlations: search for shock wave, determine parameters of the EoS - Jet analysis can yield info on the medium, such as qhat, dE/dx DOE Review, May 13th, 2008

  12. STAR Detector MTD EMC barrel MRPC ToF barrel Ready for run 10 EMC End Cap RPSD FMS FPD TPC PMD Complete Ongoing DAQ1000 Ready for run 9 HFT FGT R&D DOE Review, May 13th, 2008

  13. Blast Wave Fits: Tfovs. T 200GeV Au + Au collisions 1) p, K, and p change smoothly from peripheral to central collisions. 2) At the most central collisions, T reaches 0.6c. 3) Multi-strange particles ,  are found at higher T and lower T •  Future: Map the velocity parameter with multi-strange hadrons. Key for partonic EOS! Multi-strange hadrons freeze-out with higher Tfo (~Tch) and smaller T DOE Review, May 13th, 2008

  14. PRL (07) • Di-leptons allow us to measure the direct radiation from the matter with partonic degrees of freedom, no hadronization! • Low mass region: • , ,   e-e+ • minv e-e+ • medium effect • Chiral symmetry • - High mass region: • J/ e-e+ • minv e-e+ • Direct radiation Direct Radiation Expanding partonic matter at RHIC and LHC! DOE Review, May 13th, 2008

  15. Search for QCD Critical Point STAR Beam User Request FY10 Key measurements: All PID hadron spectra and v2 K/, <pT> … fluctuations Strategy: I- From high to low energy: sign for disappearance of high density phenomena II- Cover SPS range (sNN = 5 -20 GeV): sign for the onset of de-confinement DOE Review, May 13th, 2008

  16. Low Energy Test Run (9 GeV) Au + Au Collisions! ~ 3500 collisions collected Gain understanding of triggering issues Determine Luminosity: rate ~ 0.6 Hz at 9 GeV STAR studying the following: Particle identification in TPC; total charged multiplicity - interferometry, particle ratios; v1 and v2 5)Physics ready with 2 - 4 Hz collisions DOE Review, May 13th, 2008

  17. Ready for Physics at Energy Scan PID will be significantly extended using TOF DOE Review, May 13th, 2008

  18. SPS RHIC Observables and Advantages Torrieri Advantages at STAR: - Large acceptance: full azimuthal coverage and |y| < 1.0 - Clean particle identification: (TPC, ToF, EMC) - Acceptance does not change with beam energy, systematic errors under control - High potential for discovery DOE Review, May 13th, 2008

  19. Using strange and multi-strange hadron spectra and v2, map out parameters of collective velocity with partonic dof  To understand the QGP formation in top energy collisions at RHIC. Full jet reconstruction at RHIC  Extract energy loss parameters Utilize full azimuthal coverage of TOF, measure di-electron mass spectrum up to J/ mass (≤ 3GeV)  Study properties of the medium via direct radiations and search for signal for Chiral symmetry Perform energy scan down to SPS energy  Map the QCD phase diagram and search for the critical point. Future Plan DOE Review, May 13th, 2008

  20. Milestones RNC STAR Physics Milestones DOE Review, May 13th, 2008

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