WS on Beam Energy Scan II, 27-Sep-20141 Are there signs of EOS softening (possible 1 st -order Phase Transition)? Do we observe a turn-off of QGP signatures?

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Presentation transcript:

WS on Beam Energy Scan II, 27-Sep Are there signs of EOS softening (possible 1 st -order Phase Transition)? Do we observe a turn-off of QGP signatures? …or Critical Point? [Zhangbu] …or Chiral Effect? [Zhangbu] What are the BES-II plans & schedules? [mostly Zhangbu] Beam Energy Scan topics:

2WS on Beam Energy Scan II, 27-Sep-2014 RHIC BES History & Timeline 2007: STAR Beam Energy Scan (BES) Focus Group formed 2008: Test run at √s NN = 9.2 GeV [PRC 81, (2010)] 2009: Proposal for BES Phase-I [STAR Note SN0493 & arXiv: ] 2010: BES-I data-taking began (39, 11.5 & 7.7 GeV) 2011: Two further energies (27 & 19.6 GeV) 2012: Test at 5 GeV 2014: Final BES-I energy (14.5 GeV) & BES-II proposal Early universe 1 st -order PT Are there signs of EOS softening (possible 1 st -order Phase Transition)? Do we observe a turn-off of QGP signatures? …or Critical Point? [Zhangbu] …or Chiral Effect? [Zhangbu] What are the BES-II plans & schedules? [mostly Zhangbu] Beam Energy Scan topics:

WS on Beam Energy Scan II, 27-Sep D. H. Rischke et al., Heavy Ion Phys. 1, 309 (1995). Horst Stoecker calls this the “collapse of directed flow” E lab (A GeV) F (GeV/c) H. Liu et al. (E895), PRL 84, 5488 (2000) No sign of predicted collapse of directed flow

upVPD Magnet TOF BEMC BBC TPC The Solenoid Tracker At RHIC (STAR) -1 < η < 1 & 2  in azimuth Uniform acceptance vs √s NN Excellent particle ID 4 WS on Beam Energy Scan II, 27-Sep-2014

5 SMD is 8 horizontal slats & 7 vertical slats located at 1/3 of the depth of the ZDC Measures 1 st -order Event Plane direction at 62 GeV & up; resolution not so good as TPC, but still good enough. Minimal, if any, non-flow effects ZDC side view Scintillator slats of Shower Max Detector Transverse plane of ZDC

WS on Beam Energy Scan II, 27-Sep-20146

7 v 1 for all charged particles (UrQMD) red = 7.7 GeV & blue = 39 GeV BBC inner Upper plot illustrates why BBC’s 1 st -harmonic EP resolution (shown on left) becomes poor at 39 GeV and is unusable at 62.4 & 200 GeV

WS on Beam Energy Scan II, 27-Sep UrQMD-based simulation of 1 st -order Event Plane from STAR BBC  systematic uncertainties arising from EP method appear to be small.

WS on Beam Energy Scan II, 27-Sep √s NN (GeV) (GeV/c) STAR Preliminary Dip in mean p T for all charged particles explained by switch-over from proton dominance to pion dominance?

WS on Beam Energy Scan II, 27-Sep STAR, PRL 112, (2014) arXiv:

(GeV/c) WS on Beam Energy Scan II, 27-Sep F p = r F anti-p + (1 – r) F net-p, where F is v 1 slope & r(y) =observed anti-p over p. H. Stoecker, Nucl. Phys. A 750, 121 (2005). v 1 for both p & net-p qualitatively resembles collapse signature & is very different from UrQMD. STAR, PRL 112, (2014); arXiv: In net-p v 1 model comparison, p-bar/p from model was used; switching to experimental ratios makes only a minor difference.

12 PUSH!

13 PUSH! net (“valence”) proton

14 PUSH! SOFT...

15 PUSH! SOFT... PUSH!!

WS on Beam Energy Scan II, 27-Sep Proton directed flow shows strong centrality dependence, with an exceptional increase between 10-40% and 60-80% centrality. STAR BES-II White Paper; see STAR Note 0598 or 2014 link at npp/pac.asp

WS on Beam Energy Scan II, 27-Sep AMPT AMPT default & string melting give almost the same net-proton v 1

WS on Beam Energy Scan II, 27-Sep J. Steinheimer, J. Auvinen, H. Petersen, M. Bleicher, H. Stoecker, arXiv: PRC 89 (2014) IC =Isochronous freeze-out (sim. to 2005 hydro). IE =Iso-  E freeze-out (  E is energy density)

WS on Beam Energy Scan II, 27-Sep “Is the directed flow in heavy- ion collisions a puzzle?” Konchakovski, Cassing, Ivanov, Toneev, arXiv: Phys. Rev. C 90, (2014). Paper’s conclusion: “…semi-qualitative agreement supports a crossover type of quark-hadron transition… but shows no indication of a first- order phase transition.” EOS with 1st-order PT is mentioned, but isn’t shown in the paper. Model shows no minimum in proton v 1

STAR Preliminary WS on Beam Energy Scan II, 27-Sep y STAR Preliminary Red & blue shaded bands = UrQMD

WS on Beam Energy Scan II, 27-Sep STAR Preliminary K 0 statistics are poorer & their v 1 is consistent with both K + & K –. At higher BES energies, both K + & K – have similar neg. dv 1 / dy as  + &  –. At low BES energies, K + & K – dv 1 / dy diverge (at all p T ), unlike  + &  –. K – shows a hint of a minimum. Note the different scale for first panel.  measurement from BES-I with reasonable statistics also in pipeline. Theory comparisons & interpretation (all particle species) sorely needed (also urged by 2014 RHIC PAC). Low kaon statistics fwd-bwd reflection in y + linear slope fit This also explains why theorists at this WS get the “panda” treatment…

WS on Beam Energy Scan II, 27-Sep STAR, arXiv: (to appear in Phys. Rev. C) STAR conclusion from BES HBT data: Spatial eccentricity  F at kin. F.O. has sensitivity to EOS, but change is smooth over BES range. STAR does not confirm CERES result.

23WS on Beam Energy Scan II, 27-Sep-2014 Non-monotonicity magnified with (R out ) 2 – (R side ) 2 R side /R long indicative of expansion/lifetime Talks by Roy Lacey, Ron Soltz at QM ’14

WS on Beam Energy Scan II, 27-Sep

WS on Beam Energy Scan II, 27-Sep Re-plot of data in STAR publication arXiv: Extrapolations not needed! Interpretation still needs model comparisons, but it’s a promising PT signature

WS on Beam Energy Scan II, 27-Sep L. Van Hove, PLB 118, 138 (1982). dN/dy <pT><pT> STAR Preliminary Another corroborating suggestion of a 1 st -Order Phase Transition H. Feldmeier & J. Schnack, Rev. Mod. Phys. 72, 655 (2000). “Caloric curve” – evidence for nuclear liquid-vapor PT

WS on Beam Energy Scan II, 27-Sep E. O’Brien, Nucl. Phys. A , 264c (2013). STAR Preliminary Another corroborating suggestion of a 1 st -Order Phase Transition

WS on Beam Energy Scan II, 27-Sep All plots from STAR BES-II White Paper; see STAR Note 0598 or 2014 link at

WS on Beam Energy Scan II, 27-Sep

WS on Beam Energy Scan II, 27-Sep iTPC upgrade: Replace ageing wires; Sparse pads cover full area; better dE/dx; -1 <  < <  < 1.7; p T >125 MeV/c p T > 60 MeV/c. EPD upgrade: Replaces ageing BBC, which wasn’t designed for BES phys. Greatly improved Event Plane info (esp. 1 st -order EP); Better trigger & b/g reduction. Other: Hcal Endcap TOF

WS on Beam Energy Scan II, 27-Sep Statistical errors ~ five times smaller (see opposite); will allow surprisingly strong centrality dependence of proton v 1 to be mapped-out. Similarly enhanced statistics for less abundant particles, especially  & K. iTPC brings broader acceptance in p T & y = > explore beyond v 1 slope near y = 0. STAR BES-II White Paper; see STAR Note 0598 or 2014 link at

WS on Beam Energy Scan II, 27-Sep STAR BES-II White Paper; see STAR Note 0598 or 2014 link at

WS on Beam Energy Scan II, 27-Sep This talk focused on a subset of Beam Energy Scan topics. Proton & net-proton dv 1 /dy both show a prominent minimum that is not explained even qualitatively by hadronic transport models. The net protons show a double sign-change. Three-fluid hydro with 1 st -order PT (2005 & earlier) resembles data qualitatively, but predicted minimum is at a lower energy. Latest Frankfurt Hydro model calculations corroborate earlier double sign-change, but more realistic Hybrid model options don’t show it. Latest predictions all yield much bigger v 1 than data. PHSD/PSD model shows no minimum in proton v 1 (√s NN ). Authors argue that STAR v 1 (√s NN ) favors crossover PT. K + and K – v 1 (√s NN ) measurements from STAR BES-I have reasonable statistics & are close to being ready, and will be followed by  v 1 (√s NN ).

WS on Beam Energy Scan II, 27-Sep STAR asHBT measurements inconsistent with CERES dip in  F but R o 2 – R s 2 and R o /R s show a peak near 20 GeV that, if not reproduced by hadronic models, would imply extra duration of pion emission at energies near the peak. Preliminary study suggests strong centrality dependence of proton and net-proton v 1 (√s NN ), but BES-II statistics and iTPC + EPD upgrades are needed. BES-II statistics and upgrades are also vital for detailed studies of flow and other signatures for several less- abundant particle species. Theory comparisons and interpretation badly needed for both published and forthcoming BES measurements.