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Collective flow with PHOBOS

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Presentation on theme: "Collective flow with PHOBOS"— Presentation transcript:

1 Collective flow with PHOBOS
Steven Manly University of Rochester representing PHOBOS Why yes, this is a frisbee! Winter Workshop in Nuclear Physics Trelawny Beach, Jamaica March , 2003 The view from my office webcam: while I’m here working, my group is enjoying spring break in Rochester Winter Workshop - Jamaica - S. Manly March, 2004

2 Collaboration meeting, BNL October 2002
Birger Back, Mark Baker, Maarten Ballintijn, Donald Barton, Russell Betts, Abigail Bickley, Richard Bindel, Wit Busza (Spokesperson), Alan Carroll, Zhengwei Chai, Patrick Decowski, Edmundo Garcia, Tomasz Gburek, Nigel George, Kristjan Gulbrandsen, Stephen Gushue, Clive Halliwell, Joshua Hamblen, Adam Harrington, Conor Henderson, David Hofman, Richard Hollis, Roman Hołyński, Burt Holzman, Aneta Iordanova, Erik Johnson, Jay Kane, Nazim Khan, Piotr Kulinich, Chia Ming Kuo, Willis Lin, Steven Manly, Alice Mignerey, Gerrit van Nieuwenhuizen, Rachid Nouicer, Andrzej Olszewski, Robert Pak, Inkyu Park, Heinz Pernegger, Corey Reed, Michael Ricci, Christof Roland, Gunther Roland, Joe Sagerer, Iouri Sedykh, Wojtek Skulski, Chadd Smith, Peter Steinberg, George Stephans, Andrei Sukhanov, Marguerite Belt Tonjes, Adam Trzupek, Carla Vale, Siarhei Vaurynovich, Robin Verdier, Gábor Veres, Edward Wenger, Frank Wolfs, Barbara Wosiek, Krzysztof Wožniak, Alan Wuosmaa, Bolek Wysłouch, Jinlong Zhang ARGONNE NATIONAL LABORATORY BROOKHAVEN NATIONAL LABORATORY INSTITUTE OF NUCLEAR PHYSICS, KRAKOW MASSACHUSETTS INSTITUTE OF TECHNOLOGY NATIONAL CENTRAL UNIVERSITY, TAIWAN UNIVERSITY OF ILLINOIS AT CHICAGO UNIVERSITY OF MARYLAND UNIVERSITY OF ROCHESTER Here is a sampling of Phobos members who have gotten together for a collaboration meeting. Collaboration meeting, BNL October 2002 Winter Workshop - Jamaica - S. Manly March, 2004

3 Flow in PHOBOS Winter Workshop - Jamaica - S. Manly March, 2004

4  coverage Data at 19.6, 130 and 200 GeV h coverage for vtx at z=0 1 2
1m 2m 5m 1 2 3 4 5 h coverage for vtx at z=0 Data at 19.6, 130 and 200 GeV Winter Workshop - Jamaica - S. Manly March, 2004

5 Hit saturation, grows with occupancy Sensitivity to flow reduced
Pixelized detector Hit saturation, grows with occupancy Sensitivity to flow reduced Can correct using analogue energy deposition –or- measure of occupied and unoccupied pads in local region assuming Poisson statistics Poisson occupancy correction Winter Workshop - Jamaica - S. Manly March, 2004

6 Acceptance (phase space) weighting
Octagonal detector Relative phase space weight in annular rings = <Nocc>-1 Require circular symmetry for equal phase space per pixel Pixel’s azimuthal phase space coverage depends on location Winter Workshop - Jamaica - S. Manly March, 2004

7 Non-flow Backgrounds flow signal Non-flow background
+ f z Dilutes the flow signal Remove Background Estimate from MC and correct Winter Workshop - Jamaica - S. Manly March, 2004

8 Background suppression
Beampipe Detector Demand energy deposition be consistent with angle h dE (keV) cosh h Background! Works well in Octagon Technique does not work in rings because angle of incidence is ~90 Winter Workshop - Jamaica - S. Manly March, 2004

9 f h RingsN Octagon RingsP Vtx holes Spec holes
Winter Workshop - Jamaica - S. Manly March, 2004

10 Determining the collision point
High Resolution Low Resolution octagon hit density peaks at vertex z position extrapolate spectrometer tracks Winter Workshop - Jamaica - S. Manly March, 2004

11 f h RingsN Octagon RingsP
Vtx holes h f RingsN Octagon RingsP Spec holes Detector symmetry issues where SPEC vertex efficiency highest Most data taken with trigger in place to enhance tracking efficiency Winter Workshop - Jamaica - S. Manly March, 2004

12 Offset vtx method f h Good azimuthal symmetry
Subevents for reaction plane evaluation h f RingsN Octagon RingsP Limited vertex range along z Technique used for published elliptic flow signal at 130 GeV Good azimuthal symmetry Fewer events, no 19.6 GeV data Gap between subevents relatively small Winter Workshop - Jamaica - S. Manly March, 2004

13 Full acceptance method
Subevents for reaction plane evaluation vary with analysis h f RingsN Octagon RingsP Technique used for elliptic and directed flow signal at all energies (only directed flow released to date, elliptic flow coming soon) Vertex range -10<z<10 Good statistics, 19.6 GeV data available Gap between subevents large Requires “hole filling” Winter Workshop - Jamaica - S. Manly March, 2004

14 Dealing with the holes f h
Inner layer of vertex detector fills holes in top and bottom. Must map hits from Si with different pad pattern and radius onto a “virtual” octagon Si layer h f RingsN Octagon RingsP Winter Workshop - Jamaica - S. Manly March, 2004

15 Dealing with the holes f h
Fill spectrometer holes by extrapolating hit density from adjoining detectors onto a virtual Si layer. (Actual spec layer 1 is much smaller than the hole in the octagon.) h f RingsN Octagon RingsP Winter Workshop - Jamaica - S. Manly March, 2004

16 Track-based method f h RingsN Octagon RingsP Momentum analysis
Subevents for reaction plane h f RingsN Octagon RingsP Vertex range -8<z<10 Momentum analysis 200 GeV data Gap between tracks and subevents large Little/no background Winter Workshop - Jamaica - S. Manly March, 2004

17 Directed flow Charged hadrons 6-55% central AuAu
Winter Workshop - Jamaica - S. Manly March, 2004

18 h v1 19.6 GeV AuAu & 17.2 GeV PbPb PHOBOS Preliminary
PHOBOS AuAu √sNN=19.6 GeV NA49 PbPb √sNN=17.2 GeV Phys.Rev.C68, , 2003 6-55% Minimum Bias h± p± h Winter Workshop - Jamaica - S. Manly March, 2004

19 v1 at 200 GeV AuAu:PHOBOS & STAR
PHOBOS Preliminary PHOBOS 6-55% central Since there is STAR data for v1 available at 200 GeV, we can make a comparison. At mid-pseudorapidity, the measurements are consistent with zero. At high rapidity, it is non-zero. here: stress 2 things: at zero eta it's consistent with zero at eta=3 or 4 it's non-zero it doesn’t agree with STAR at eta = 3, but at this point can we stick our necks out and say that we don’t agree with STAR? no, I don’t think so. flat midrapidity... h± STAR AuAu 200 GeV 10-70% central h STAR, PRL 92 (2004) Winter Workshop - Jamaica - S. Manly March, 2004

20 In target frame of reference, directed flow exhibits signal consistent with limiting fragmentation
Winter Workshop - Jamaica - S. Manly March, 2004

21 v2 vs. h at 130 and 200 GeV AuAu h± Hit-based method Minimum Bias
() PHOBOS Preliminary v2200 h± () PHOBOS v2130 Hit-based method () Nucl.Phys. A715 (2003) () PRL 89, (2002) Winter Workshop - Jamaica - S. Manly March, 2004

22 v2 vs. h 200 GeV centrality dependence
width of h bin h± PHOBOS Preliminary central 3-15% midcentral 15-25% peripheral 25-50% Hit-based method Winter Workshop - Jamaica - S. Manly March, 2004

23 v2 vs.  200 GeV method comparison
central 3-15% h± Track-based Hit-based v2 h PHOBOS Preliminary Track-based Hit-based midcentral 15-25% h± v2 h PHOBOS Preliminary Track-based Hit-based peripheral 25-50% h± v2 h PHOBOS Preliminary Winter Workshop - Jamaica - S. Manly March, 2004

24 Combined hit (offset vertex) and track based results for v2 vs
Combined hit (offset vertex) and track based results for v2 vs. || at 200 GeV (Au-Au) Winter Workshop - Jamaica - S. Manly March, 2004

25 v2 vs. pt AuAu pt (GeV/c) v2 v2 pt (GeV/c) track-based method
STAR 130 GeV 4-cumulant STAR 130 GeV 2-cumulant STAR 130 GeV Reaction Plane 5-53% central Preliminary PHOBOS 200 GeV 0-55% central pt (GeV/c) v2 Preliminary PHOBOS 200 GeV 0-55% central track-based method v2 h± pt (GeV/c) • Nucl.Phys. A715 (2003) Winter Workshop - Jamaica - S. Manly March, 2004

26 PHOBOS signal not pt weighted, thus dominated by low pt hits where STAR 2- and 4-particle cumulants have small absolute difference STAR 130 GeV 4-cumulant STAR 130 GeV 2-cumulant STAR 130 GeV Reaction Plane 5-53% central Preliminary PHOBOS 200 GeV 0-55% central pt (GeV/c) v2 Winter Workshop - Jamaica - S. Manly March, 2004

27 Gives the famous dip in multiplicity distribution.
y vs.  Get a suppression in the spectra which is largest at low pt and small ||. It vanishes at large || and high pt. Gives the famous dip in multiplicity distribution. If integrating v2 over pt, get suppression of the lower pt part (where v2 is small) and the signal should rise. Winter Workshop - Jamaica - S. Manly March, 2004

28 This leads to an enhancement of inclusive v2 at mid-
P. Kolb, Proc. of 17th Winter Workshop on Nuclear Dynamics (2001) Transformation of spectra from  to y leads to suppression of multiplicity at low pt and low || This leads to an enhancement of inclusive v2 at mid- ~10% T. Hirano, BNL-Riken Workshop on Collective Flow and the QGP (Nov. 2003) Winter Workshop - Jamaica - S. Manly March, 2004

29 Limiting fragmentation of elliptic flow
PHOBOS Preliminary v2200 PHOBOS v2130 Winter Workshop - Jamaica - S. Manly March, 2004

30 Limiting fragmentation of elliptic flow
Scaled by “Kolb factor” PHOBOS Preliminary v2200 PHOBOS v2130 Winter Workshop - Jamaica - S. Manly March, 2004

31 Directed flow measured at 19.6, 130 and 200 GeV
Conclusions Directed flow measured at 19.6, 130 and 200 GeV Mild disagreement with STAR about || where v1 kicks in, but both see flat slope at mid- v1 shows a limiting fragmentation behavior similar to the multiplicity v2() hit and track results agree. Likely there is very little non-flow correlations. Expect only small difference between v2() and v2(y). Hint of limiting fragmentation behavior in v2. Expect better results on this soon Winter Workshop - Jamaica - S. Manly March, 2004

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