1. Lawrence Livermore National Laboratory Physical Sciences Recent Results from HotQCD and Experimental Benchmarks for Hydrodynamnics or the story of how I got here... Ron Soltz

2. 2 Option:UCRL# Option:Directorate/Department Additional Information Physical Sciences In The Beginning...  Why is HBT so hard? Freeze-out EOS Initial State  HBT is just last step in hydro and physics  HBT puzzle is really a hydro observable puzzle renaming problem doesn’t solve it HBT puzzle sounds better Lisa, Pratt, Soltz Wiedemann, Ann. Rev. 55:xxx (2005) and ref. It’s enough to drive some to the bottle... and others to the lattice !

3. 3 Option:UCRL# Option:Directorate/Department Additional Information Physical Sciences The prescription - for solving the puzzle  Fix Freeze-Out Cascade Afterburner - UrQMD/JAM Important for HBT, but v 2 not immune  Calculate/Constrain Inputs Equation of State - no 1 st order for HBT Initial Conditions Transport Coefficients Aspects begun by most participants (later slides & talks)

4. 4 Option:UCRL# Option:Directorate/Department Additional Information Physical Sciences Schematically looks like also Resemblance to certain computers not coincidental

5. 5 Option:UCRL# Option:Directorate/Department Additional Information Physical Sciences In the meantime...  LLNL (64+40 racks), BNL, SDSC, Argonne, Julich, KEK, MIT, etc. Delivery of 64 racks in Fall ‘06 added means to motivation... ability to run calculations on N  =8 lattices

6. 6 Option:UCRL# Option:Directorate/Department Additional Information Physical Sciences The Birth of HotQCD  HotQCD = MILC + RBC-Bielefeld + LLNL + LANL Computing without experience would have been insufficient

7. 7 Option:UCRL# Option:Directorate/Department Additional Information Physical Sciences HotQCD timeline (politics and physics)  Feb 2006, LLNL Workshop http://physci.llnl.gov/Conferences/qcdeos06/  May 2006, Proposal to NNSA/ASC Program Office extend staggered action to Nt=8, domain wall ls=96  Oct 2006, first accounts - Polyakov Loop at QM06  July 2007, 8 rack x 4w - Tc at Lattice 2007  Jan 2008, 72 rack x 3w - EOS QM08 & BNLHydro08  Apr-Jun 2008, 8 rack x 6w - finish and publish  May 2-3, Lattice Strong Dynamics Workshop http://www.yale.edu/LSD/workshop.html Contact Vranas@llnl.gov http://www.yale.edu/LSD/workshop.html physics goals = N  =8 T c /EOS continuum corrections improved stag.... and domain wall fermion action

8. 8 Option:UCRL# Option:Directorate/Department Additional Information Physical Sciences Transition Temperature - Deconfinement  Polyakov Loop and Strange Quark Number Susceptibility Lines at 185,195 MeV to set range of N  =8 transition HotQCD Preliminary

9. 9 Option:UCRL# Option:Directorate/Department Additional Information Physical Sciences Transition Temperature - Chiral  Subtracted Chiral Condensate and Total Chiral Susceptibility Same lines at (185,195 MeV) set range for chiral N  =8 transition HotQCD Preliminary

10. 10 Option:UCRL# Option:Directorate/Department Additional Information Physical Sciences Chiral vs. Deconfinement  10 MeV range can accommodate both Nt8 transitions for both actions  Aoki et al., PLB 643:46 (2006) report T c chiral - T c deconf = 24(4) MeV different normalization for chiral susceptibility Chiral symmetry transition at peak Deconfinment transition at inflection HotQCD Preliminary

11. 11 Option:UCRL# Option:Directorate/Department Additional Information Physical Sciences Renormalized Chiral Susceptibility  Renormalization shift could be as large as 10 MeV  HotQCD not yet ready to quantify transition difference, but Experimental Observables depend on Equation Of State HotQCD Preliminary

12. 12 Option:UCRL# Option:Directorate/Department Additional Information Physical Sciences Back to hydrodynamics, EOS ∂         p  u  u   g  p

13. 13 Option:UCRL# Option:Directorate/Department Additional Information Physical Sciences Current Status of Hydro  Kolb, et al. azhydro, 2+1, 1 st order EOS, sudden freeze-out  Huovinen 2+1, vary EOS  Bass, Nonaka, et al. 3+1, vary T C, UrQMD afterburner, EOS (in progress)  Hirano, et al. 3+1, PCE freeze-out, JAM afterburner  Teany w/ viscous effects  Molnar work in progress

14. 14 Option:UCRL# Option:Directorate/Department Additional Information Physical Sciences HotQCD EOS and Hydro  Working to implement HotQCD EOS into azhydro grateful for help from P. Huovinen not ready, perhaps by end of workshop  For HotQCD EOS see talks by Ludmilla Levkova - asqtad EOS Michael Cheng - p4 EOS and comparisons

15. 15 Option:UCRL# Option:Directorate/Department Additional Information Physical Sciences Future Plans (to benchmark) 1.Finish and publish HotQCD p4/asqtad EOS 2.Insert EOS into azhydro w/ statistical and systematic errors  compare to primary soft observables  spectra, flow, HBT 3.Vary initial conditions 4.Modify sudden freeze-out - requires moving beyond azhydro Emphasis will be on mapping errors in soft signatures

16. 16 Option:UCRL# Option:Directorate/Department Additional Information Physical Sciences Future Plans (to collaborate)  Grateful for help (past, present, future) Pasi Huovinen & Denes Molnar build on azhydro work test out FLASH hydrodynamic code  Obvious value in running multiple hydro codes w/ same conditions through direct communication... or in larger context (i.e. TECHQM08) Can provide cpu cycles and ability to use them

17. 17 Option:UCRL# Option:Directorate/Department Additional Information Physical Sciences Future plans (broad context)  More to be done on EOS finite baryon density physical quark mass closer to continuum spectral fns, and transport coeff. chiral symmetric fermion actions  And Hydrodynamics viscous effects soft probes -  /K/p spectra + v 2 + 2  HBT not exhaustive hard probes - energy quenching, and speed of sound Looking forward to a productive workshop !