QM 2009, Knoxville1 Forward-Rapidity Azimuthal and Radial Flow of Identified Particles for = 200 GeV Au+Au and Cu+Cu Collisions S.J. Sanders (U. Kansas)

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Presentation transcript:

QM 2009, Knoxville1 Forward-Rapidity Azimuthal and Radial Flow of Identified Particles for = 200 GeV Au+Au and Cu+Cu Collisions S.J. Sanders (U. Kansas) for the BRAHMS Collaboration

QM 2009, Knoxville2 Flow Ring 3 Z = -11 cm Flow Ring 2 Si Ring 1 Tile Ring 1 I. Experimental Method

QM 2009, Knoxville3 Determine v 2 by reaction plane method Sinceis not measured The BRAHMS spectrometers identify particles at  =0 o (MRS) and 180 o (FS) with the corresponding reaction plane angles  rp determined by the global detector systems.

QM 2009, Knoxville4 Preliminary …there is a reduction in the v 2 values at forward rapidities that is most pronounced for the more peripheral events. II.Pseudorapidity dependence of charged- hadron elliptic flow

QM 2009, Knoxville5 Preliminary …3D Hydro with Glauber IC has good agreement with experiment at mid- rapidity but predicts larger values than observed at forward rapidity. T.Hirano and Y.Nara, Nucl.Phys.A743(2004)305 =272 =103

QM 2009, Knoxville6 PHOBOS has shown that the integral v 2 values for 200-GeV AuAu fall considerably going to forward rapidity. Is this consistent with the BRAHMS results?

QM 2009, Knoxville7 Calculating the integral v 2 from the differential…  =0

QM 2009, Knoxville8  ~3 The integral v 2 values decrease at forward rapidity BOTH because of a reduction of the differential v 2 (p T ) values AND a smaller.

QM 2009, Knoxville9 There is general agreement of the BRAHMS integral v2 calculated from the pt distributions to the PHOBOS results…

QM 2009, Knoxville GeV CuCu …3D Hydro with Glauber IC does good job in describing data. Very Preliminary =78

QM 2009, Knoxville11 Preliminary III. Identified Particle Results 200-GeV AuAu

QM 2009, Knoxville12 …again, 3D Hydro does good job describing more central, mid-rapidity results, including the mass ordering. Preliminary

QM 2009, Knoxville13 R.A. Lacey and A. Taranenko, nucl-ex/ Scaled yields consistent with ideal hydrodynamics.. Constituent quark scaling has been found to highlight a common behavior for 200-GeV AuAu v 2 results for many particle species…

QM 2009, Knoxville14 Constituent quark scaling of BRAHMS data.. Preliminary The curve is based on the previously observed behavior near mid-rapidity…

QM 2009, Knoxville15 The reduction in azimuthal flow at forward coincides with an apparent reduction in radial flow, as evidenced by values…  =0, 0-10% CuCu protons pions

QM 2009, Knoxville16 IV. Summary BRAHMS has measured identified-particle v 2 (p T ) at  =0,1, and 3 for the Au+Au and Cu+Cu systems at =200 GeV. The differential elliptic flow decreases at forward rapidity. Corresponding measurements of the particle spectra indicate a decrease in at forward rapidity, suggesting a reduction in radial flow. The significant decrease in the integral v 2 values going to forward rapidity is found to arise from BOTH the reduction in differential elliptic flow and a reduction in radial flow. 3D Hydro does a good job reproducing the mid-rapidity results for both charged hadrons and identified particles, but predicts too large v 2 values at forward rapidity.

QM 2009, Knoxville17 I.Arsene 7, I.G. Bearden 6, D. Beavis 1, S. Bekele 6, C. Besliu 9, B. Budick 5, H. Bøggild 6, C. Chasman 1, C. H. Christensen 6, P. Christiansen 6, R. Clarke 9, R.Debbe 1, J. J. Gaardhøje 6, K. Hagel 7, H. Ito 10, A. Jipa 9, J. I. Jordre 9, E.B. Johnson 10, C.E.Jørgensen 6, R. Karabowicz 3, N. Katryńska 3, E. J. Kim 4, T.M.Larsen 11, J. H. Lee 1, Y. K. Lee 4, S.Lindal 11, G. Løvhøjden 2, Z. Majka 3, M. Murray 10, J. Natowitz 7, B.S.Nielsen 6, D. Ouerdane 6, R.Planeta 3, F. Rami 2, C. Ristea 6, O. Ristea 9, D. Röhrich 8,, S. J. Sanders 10, R.A.Sheetz 1, P. Staszel 3, T.S. Tveter 11, F.Videbæk 1, R. Wada 7, H. Yang 6, Z. Yin 8, I. S. Zgura 9, and V. Zhukova 10 1 Brookhaven National Laboratory, USA, 2 Strasbourg, France 3 Jagiellonian University, Cracow, Poland, 6 Niels Bohr Institute, University of Copenhagen, Denmark 7 Texas A&M University, College Station. USA, 8 University of Bergen, Norway 9 University of Bucharest, Romania, 10 University of Kansas, Lawrence,USA 11 University of Oslo, Norway The BRAHMS Collaboration