Flow and Bose-Einstein Correlations in Au-Au Collisions at RHIC

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1 Flow and Bose-Einstein Correlations in Au-Au Collisions at RHIC
Steven Manly (Univ. of Rochester) For the PHOBOS Collaboration Probe the source dynamics through correlations Flow constitutes the bulk of this talk July 18, 2002 S.Manly (PHOBOS) - QM2002

2 Collaboration July 18, 2002 S.Manly (PHOBOS) - QM2002
ARGONNE NATIONAL LABORATORY Birger Back, Alan Wuosmaa BROOKHAVEN NATIONAL LABORATORY Mark Baker, Donald Barton, Alan Carroll, Nigel George, Stephen Gushue, George Heintzelman, Burt Holzman, Robert Pak, Louis Remsberg, Peter Steinberg, Andrei Sukhanov INSTITUTE OF NUCLEAR PHYSICS, KRAKOW Andrzej Budzanowski, Roman Hołyński, Jerzy Michałowski, Andrzej Olszewski, Pawel Sawicki, Marek Stodulski, Adam Trzupek, Barbara Wosiek, Krzysztof Woźniak MASSACHUSETTS INSTITUTE OF TECHNOLOGY Maartin Ballintijn, Wit Busza (Spokesperson), Patrick Decowski, Kristjan Gulbrandsen, Conor Henderson, Jay Kane, Judith Katzy, Piotr Kulinich, Jang Woo Lee, Heinz Pernegger, Corey Reed, Christof Roland, Gunther Roland, Leslie Rosenberg, Pradeep Sarin, Stephen Steadman, George Stephans, Carla Vale, Gerrit van Nieuwenhuizen, Gábor Veres, Robin Verdier, Bernard Wadsworth, Bolek Wysłouch NATIONAL CENTRAL UNIVERSITY, TAIWAN Chia Ming Kuo, Willis Lin, Jaw-Luen Tang UNIVERSITY OF ILLINOIS AT CHICAGO Russell Betts, Edmundo García, Clive Halliwell, David Hofman, Richard Hollis, Aneta Iordanova, Wojtek Kucewicz, Don McLeod, Rachid Nouicer, Michael Reuter, Joe Sagerer UNIVERSITY OF MARYLAND Abigail Bickley, Richard Bindel, Alice Mignerey, Marguerite Belt Tonjes UNIVERSITY OF ROCHESTER Joshua Hamblen, Erik Johnson, Nazim Khan, Steven Manly, Inkyu Park, Wojtek Skulski, Ray Teng, Frank Wolfs July 18, 2002 S.Manly (PHOBOS) - QM2002

3 Elliptic flow Determine to what extent the initial state spatial anisotropy is mapped into the final state particle production. dN/d(f -YR ) = N0 (1 + 2v1cos (f-YR) + 2v2cos (2(f-YR) ) Sensitive to the degree of equilibration and the initial equation of state. Affects other variables, such as HBT and spectra. July 18, 2002 S.Manly (PHOBOS) - QM2002

4 Correct for imperfect reaction plane resolution
Flow: basic method  dependence of the multiplicity Subevent technique: correlate qqqreaction plane in one part of qqqdetector to  asymmetry in qqqtrack pattern in other part of qqqdetector Correct for imperfect reaction plane resolution -2.0 < h < -0.1 SubE (a) SubE (b) Yna Ynb 0.1 < h < July 18, 2002 S.Manly (PHOBOS) - QM2002

5 The PHOBOS Detector (2001 run)
Spectrometer Vertex 1m Octagon Paddle Trigger Counter Ring Counters Cerenkov Counter Silicon Pad Channels July 18, 2002 S.Manly (PHOBOS) - QM2002

6 h f RingsN Octagon RingsP July 18, 2002 S.Manly (PHOBOS) - QM2002

7 Flow: Hit-based method
nucl-ex/ submitted to PRL Select vertices offset in z, symmetric coverage in ,  h f RingsN Octagon RingsP July 18, 2002 S.Manly (PHOBOS) - QM2002

8 Flow: Hit-based method
nucl-ex/ submitted to PRL Select vertices offset in Z, symmetric coverage in ,  Reaction plane determined by subevents in -2<<2 h f RingsN Octagon RingsP July 18, 2002 S.Manly (PHOBOS) - QM2002

9 Flow: Hit-based method
nucl-ex/ submitted to PRL Select vertices offset in Z, symmetric coverage in ,  Reaction plane determined by subevents in -2<<2 Elliptic flow (v2) determined for ||<5.3 h f RingsN Octagon RingsP July 18, 2002 S.Manly (PHOBOS) - QM2002

10 Flow: Track-based New for QM2002! Reaction plane determined by hits in widely separated subevent regions, symmetric in ,  Vertex measurement July 18, 2002 S.Manly (PHOBOS) - QM2002

11 Flow: Track-based New for QM2002! Reaction plane determined by hits in widely separated subevent regions, symmetric in ,  Correlate tracks in spectrometer to reaction plane to determine v2 July 18, 2002 S.Manly (PHOBOS) - QM2002

12 Hit-based analysis Track-based analysis pt dependence
Tracks less background sensitive Minimal MC dependence Subevents and tracks wwwidely separated in h (Species dependence) Large h coverage Event-by-event Uniform acceptance in  Separated subevents July 18, 2002 S.Manly (PHOBOS) - QM2002

13 v2 vs. centrality and energy Hit-based result v2200 & v2130 similar
Preliminary v2200 Final v2130 200 130 130 GeV errors not shown Similar to 130 GeV results Within errors, difficult to distinguish whether or not v2 is saturated or scales with the increase in multiplicity as the energy increases. PHOBOS Au-Au Hit-based result v2200 & v2130 similar <Npart> 130 GeV result: nucl-ex/ , submitted to PRL July 18, 2002 S.Manly (PHOBOS) - QM2002

14 v2 v2 vs. centrality, method comparison |h|<1 track hit
v2200 (hit) v2200 (track) track hit PHOBOS Preliminary 200 GeV Au-Au 130 GeV errors not shown Similar to 130 GeV results Within errors, difficult to distinguish whether or not v2 is saturated or scales with the increase in multiplicity as the energy increases. <Npart> Hit and track-based results agree! July 18, 2002 S.Manly (PHOBOS) - QM2002

15 v2 vs. pT v2 0<h<1.5 v2 appears to saturate for pT>2
PHOBOS preliminary h+ + h- 200 GeV Au-Au track-weighted centrality averaging (top 55%) 17% scale error Here we integrate over h+ and h- v2 appears to saturate for pT>2 Similar to published results at 130 GeV (STAR, PHENIX) July 18, 2002 S.Manly (PHOBOS) - QM2002

16 v2 vs.  and energy v2 200 130 h Hit-based result
<Npart>~190 v2 Preliminary v2200 Final v2130 PHOBOS Au-Au 200 130 Hit-based result v2200 & v2130 similar Again, little changed from 130 GeV h 130 GeV result: nucl-ex/ , submitted to PRL July 18, 2002 S.Manly (PHOBOS) - QM2002

17 v2 -dependence Unambiguous large drop in v2 over broad range in  v2
PHOBOS preliminary 200 GeV Au-Au h v2 v2 -dependence Unambiguous large drop in v2 over broad range in  July 18, 2002 S.Manly (PHOBOS) - QM2002

18 v2 -dependence Unambiguous large drop in v2 over broad range in 
Know pT, multiplicity, species yield vary with h and all can affect flow PHOBOS preliminary h+ + h- 200 GeV Au-Au 0<h<1.5 v2 recall July 18, 2002 S.Manly (PHOBOS) - QM2002

19 There is no large central plateau in the multiplicity distribution!
dNch/dh’/<Npart> Systematic errors not shown h’=h-ybeam Phobos There is no large central plateau in the multiplicity distribution! See talk by Mark Baker tomorrow morning and talk by Peter Steinberg in minutes in session I July 18, 2002 S.Manly (PHOBOS) - QM2002

20 ? We look forward to seeing data(h) from BRAHMS! Boost invariance
at RHIC We look forward to seeing data(h) from BRAHMS! July 18, 2002 S.Manly (PHOBOS) - QM2002

21 HBT Another way to look at source dynamics ...  phase space
Identified ’s July 18, 2002 S.Manly (PHOBOS) - QM2002

22 Data sample PHOBOS preliminary July 18, 2002 S.Manly (PHOBOS) - QM2002

23 HBT results - - ++  15% most central events Rout Rside Rlong
0.2<y<1.5 0.15<kT<0.35 Phobos preliminary 200 GeV Au-Au 15% most central events Rout Rside Rlong R2out-long - - 0.540.02 5.80.2 5.10.4 6.80.3 4.91.7 ++ 0.570.03 5.80.2 4.90.4 7.30.3 4.51.9 Systematic error on radii of 1 fm, on  of 0.06 July 18, 2002 S.Manly (PHOBOS) - QM2002

24 Scaling with energy -- data
Central , low kt bin For more on HBT at PHOBOS, see poster by C.M. Kuo July 18, 2002 S.Manly (PHOBOS) - QM2002 Compilation of non-PHOBOS data from C. Adler et al., Phys. Rev. Lett. 87, (2001)

25 Summary/parting thoughts
PHOBOS analyzing flow with hits and tracks v2200 is little changed from v2130 v2(pT) appears to saturate for pT>2 GeV/c Rout, Rside, Rlong at 200 GeV are similar to those at 130 GeV AND ... July 18, 2002 S.Manly (PHOBOS) - QM2002

26 Boost invariance July 18, 2002 S.Manly (PHOBOS) - QM2002

27 Boost invariance July 18, 2002 S.Manly (PHOBOS) - QM2002

28 An expert is a man who has made all the mistakes, which can be made, in a very narrow field.
- Niels Bohr, recalled on his death, November 1962 More to come from : P. Steinberg - Universal behavior of charged particle production (session I, his talk is just starting … skip the QA and go!) M. Baker - Global observations from PHOBOS Tomorrow morning (19th) B. Wosiek - Identified particle pt distributions (including very low pt!) Parallel session I, tomorrow night (19th) C. Roland - Scaling of charged hadron pt distributions Parallel session I, Saturday evening (20th) C.M. Kuo - HBT Correlations (poster) A. Iordanova - 20 GeV Au-Au analysis (poster) R. Hollis GeV p-p analysis (poster) July 18, 2002 S.Manly (PHOBOS) - QM2002

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