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What have we learned from Anisotropic Flow at RHIC ?

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1 What have we learned from Anisotropic Flow at RHIC ?
Hiroshi Masui for the PHENIX Collaboration 2006 RHIC & AGS Annual User’s meeting June 5 – 9, 2006 at Brookhaven National Laboratory Workshop 8 : How perfect is this matter ? Hiroshi Masui / University of Tsukuba

2 “Perfect liquid” at RHIC
Strong collective flow, nearly perfect liquid Hiroshi Masui / University of Tsukuba

3 Hiroshi Masui / University of Tsukuba
Definitions Py Pz Z Px Reaction plane Y X Anisotropic Flow Azimuthal correlation to reaction plane Elliptic flow (v2) Hiroshi Masui / University of Tsukuba

4 Hiroshi Masui / University of Tsukuba
Outline Elliptic Flow and Hydrodynamics PHENIX experiment Particle identification, event plane Eccentricity scaling and speed of sound Kinetic energy (Hydro) scaling and Partonic collectivity Summary Hiroshi Masui / University of Tsukuba

5 Hiroshi Masui / University of Tsukuba
v2 and hydrodynamics PHENIX : PRL 91, (2003) D. Teaney : PRC 68, (2003) Large elliptic flow at RHIC Elliptic flow is well described by hydrodynamics Magnitude, particle type up to pT ~ 1.5 GeV/c Indicate early thermalization  < 1 fm/c, extremely low viscosity < 0.1 Hiroshi Masui / University of Tsukuba

6 Hiroshi Masui / University of Tsukuba
PHENIX experiment Hadron identification Time-of-Flight || < 0.35, || < /4 EM Calorimeter || < 0.35, || < /2 Event plane Beam Beam Counter, 3 < || < 3.9, full azimuth Hiroshi Masui / University of Tsukuba

7 Hadron identification
Time-of-flight || < /4, || < 0.35 Timing resolution ~ 120 ps /K separation ~ 2 GeV/c K/p separation ~ 4 GeV/c Good timing resolution EM Calorimeter || < /2, || < 0.35 Timing resolution ~ 400 ps /K separation ~ 1 GeV/c K/p separation ~ 2 GeV/c Large acceptance Hiroshi Masui / University of Tsukuba

8 Event plane @ 3<||<4
Large rapidity gap Central arm || < BBC 3 < || < 4 Smaller non-flow contribution Hiroshi Masui / University of Tsukuba

9 v2 from ideal fluid dynamics
t0 = 0.6 fm/c b = 8 fm transverse size of system R. S. Bhalerao, J.P. Blaizot, N. Borghini, J.-Y. Ollitrault, PLB 627, 49, (2005) v2 scales initial eccentricity () v2/ is independent on system size R v2 grows with cs Can we test these relations from the data ? Hiroshi Masui / University of Tsukuba

10 Can we test eccentricity scaling of v2 ?
Does v2 scale eccentricity ? Centrality dependence of v2/ Is v2/ independent of system size ? Au+Au vs Cu+Cu Estimate of speed of sound can be made from the measurement of v2/ Hiroshi Masui / University of Tsukuba

11 Eccentricity and integrated v2
Eccentricity is usually estimated by Glauber Model Integrated v2 is proportional to eccentricity Advantage of integrated v2 : Reduce large systematic error from Glauber MC, typically 20 – 30 % Cancel systematic error from event plane determination Hiroshi Masui / University of Tsukuba

12 Hiroshi Masui / University of Tsukuba
Eccentricity scaling PHENIX PRELIMINARY k ~ 3.1 obtained from data Scaling holds for a broad range of centrality Centrality %, b ~ 8.7 fm Independent of system size Hiroshi Masui / University of Tsukuba

13 Hiroshi Masui / University of Tsukuba
Estimate of cs <pT> ~ 0.45 GeV/c NOTE v2 value is typically factor 2 lager than Cs = 0.35  0.05 Indicate softer EOS compared to cs=1/3 v2/ ~ 0.1 (peripheral) – 0.2 (central) at STAR and PHOBOS Integrated v2 does not develop so much in the late hadronic stage Hiroshi Masui / University of Tsukuba

14 Kinetic energy scaling
M. Issah, A. Taranenko, nucl-ex/ K0S,  (STAR) : PRL 92, (2004)  (STAR) : PRL 95, (2005) , K, p (PHENIX) : preliminary Meson v2 Baryon v2 * Kinetic energy of a particle in a relativistic fulid KET ~ mT – m0 at y ~ 0 Hadron mass Kinetic energy scaling works up to KET ~ 1 GeV Indicate hydrodynamic behavior Possible hint of quark degrees of freedom at higher KET Hiroshi Masui / University of Tsukuba

15 What can we learn from identified hadrons ?
NCQ (Number of Constituent Quark) scaling of v2 indicate partonic collectivity at RHIC  meson is a good probe to test NCQ scaling No re-scattering in hadronic stage Longer life time ~ 40 fm/c Thermal s-quark coalesce/recombine to form  meson QM2005, M. Oldenburg, STAR Hiroshi Masui / University of Tsukuba

16 Hiroshi Masui / University of Tsukuba
Clear  signal   K+K- Typical S/N ~ 0.3 Centrality 20 – 60 % S/N is good Event plane resolution is good Separation of v2 between meson and baryon is good Magnitude of v2 do not vary very much Before subtraction Signal + Background Background After subtraction Hiroshi Masui / University of Tsukuba

17 Hiroshi Masui / University of Tsukuba
 Meson v2 N. Borghini, J.-Y. Ollitrault, PRC 70, (2004) Obtained from invariant mass fit method Consistent with standard subtraction method Smaller systematic error pT < 2 GeV/c Consistent with mass ordering from hydrodynamics Hiroshi Masui / University of Tsukuba

18 Partonic Collectivity (i)
Hydro. (KET) scaling Hydro. + Nquark scaling SQM2006, S. Blyth, STAR Hydro + NCQ scaling works for  meson STAR result favors NCQ=2 for  Consistent with other multi-strange hadrons (, ) from STAR  Collective flow of s-quark Hiroshi Masui / University of Tsukuba

19 Partonic Collectivity (ii)
PHENIX PRELIMINARY WWND 2006, M. Issah SQM2006, S. Esumi Data :QM2005, PHENIX K0S,  (STAR) : PR 92, (2004)  (STAR) : PRL 95, (2005)  (STAR) : preliminary STAR preliminary 0-80% Au+Au 200GeV Yan Lu SQM05 P. Sorensen SQM05 M. Oldenburg QM05 K0S    Hydro + NCQ scaling describes v2 for a variety of particles measured at RHIC Scaling breaks for higher pT Hiroshi Masui / University of Tsukuba

20 Hiroshi Masui / University of Tsukuba
Summary What have we learned from anisotropic flow + hydrodynamics at RHIC ? Strongly interacting partonic matter Large v2  Early thermalization,  < 1 fm/c v2 scales eccentricity, independent of system size (Au, Cu) Estimated speed of sound = 0.35  0.05 Partonic Collectivity Kinetic energy + NCQ scaling works for a broad set of particles What more can be learned ? Centrality, energy dependence of v2 v4/(v2)2 as a probe for degree of thermalization PHENIX talks in this session 2:25 PM : S. Sakai, heavy flavor electron v2 4:20 PM : J. Newby, HBT Hiroshi Masui / University of Tsukuba

21 Hiroshi Masui / University of Tsukuba
Thank you Hiroshi Masui / University of Tsukuba

22 Hiroshi Masui / University of Tsukuba
Back up Hiroshi Masui / University of Tsukuba

23 Hiroshi Masui / University of Tsukuba
v2/, STAR, PHOBOS v2/part v2/ CIPANP 2006, S. Voloshin, STAR QM2005, S. Manly, PHOBOS v2/ ~ 0.1 – 0.2 Hiroshi Masui / University of Tsukuba

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