Charged Particle FLOW measurement for |h|<5.3 with the PHOBOS ...

Charged Particle FLOW measurement for |h|&lt;5.3 with the PHOBOS ...

Charged Particle FLOW measurement for ||<5.3 with the PHOBOS detector Inkyu Park (Univ. of Rochester) for the PHOBOS Collaboration PHOBOS Collaboration ARGONNE NATIONAL LABORATORY Birger Back, Nigel George, Alan Wuosmaa BROOKHAVEN NATIONAL LABORATORY Mark Baker, Donald Barton, Alan Carroll, Stephen Gushue, George Heintzelman, Robert Pak, Louis Remsberg, Peter Steinberg, Andrei Sukhanov INSTITUTE OF NUCLEAR PHYSICS, KRAKOW Andrzej Budzanowski, Roman Holynski, Jerzy Michalowski, Andrzej Olszewski, Pawel Sawicki, Marek Stodulski, Adam Trzupek, Barbara Wosiek, Krzysztof Wozniak MASSACHUSETTS INSTITUTE OF TECHNOLOGY Wit Busza*, Patrick Decowski, Kristjan Gulbrandsen, Conor Henderson, Jay Kane, Judith Katzy, Piotr Kulinich, Johannes Muelmenstaedt, Heinz Pernegger, Corey Reed, Christof Roland, Gunther Roland, Leslie Rosenberg, Pradeep Sarin, Stephen Steadman, George Stephans, Gerrit van

Nieuwenhuizen, Carla Vale, Robin Verdier, Bernard Wadsworth, Bolek Wyslouch NATIONAL CENTRAL UNIVERSITY, TAIWAN Willis Lin, Jawluen Tang UNIVERSITY OF ROCHESTER Joshua Hamblen, Erik Johnson, Nazim Khan, Steven Manly, Inkyu Park, Wojtek Skulski, Ray Teng, Frank Wolfs UNIVERSITY OF ILLINOIS AT CHICAGO Russell Betts, Clive Halliwell, David Hofman, Burt Holzman, Wojtek Kucewicz, Don McLeod, Rachid Nouicer, Michael Reuter UNIVERSITY OF MARYLAND Richard Bindel, Edmundo Garcia-Solis, Alice Mignerey *spokesperson 2000-01-17 [email protected] - Inkyu Park 2

Physics Goal of RHIC & Flow b (reaction plane) Initial state anisotropy Equation of state Degree of thermalization Flo w Flow strength dN/d(R ) = N0 (1 + 2V1cos (R) + 2V2cos (2(R) + ... ) Directed flow Elliptic flow In-plane OR Out-of-plane affect other physics: HBT, Spectra, etc 2000-01-17

[email protected] - Inkyu Park 3 PHOBOS Detector setup 2000 Paddle Trigger Counter TOF Spectrometer Ring Counters Octagon+Vertex See Robert Paks talk 2000-01-17 [email protected] - Inkyu Park 4 Paddle counters : Trigger & Centrality ZDC

N Positive Paddles Negativ e Paddles x Au Au PN z ZDC P Data Npart

PP MC Paddle Signal Paddle Signal See Judith Katzys talk 2000-01-17 [email protected] - Inkyu Park 5 Spectrometer : Vertex Reconstruction z 2000-01-17 form 3D vertex

[email protected] - Inkyu Park 6 Octagon and Ring detectors || < 5.3 (, 0 ( 5.0m 2.3m 1.1m octagon Ring counter Interaction Point -1.1m 5.0m -2.3m 2000-01-17

[email protected] - Inkyu Park 7 Hit Definition Charged particle deposit energy in pad hit event vertex 1 hit = pad with energy > 60 keV Particle direction 60keV Octagon

Energy deposit (keV) 2000-01-17 [email protected] - Inkyu Park 60keV Ring Energy deposit (keV) 8 Event Selection Rings N vertex available Rings P -56cm z

14cm Octago n To cover pseudo-rapidity -2.0 to 2.0, only events with vertex -38cm to -30 cm are used Rings will cover 3.0 < || < 5.3 13K events are used finally for the analysis 2000-01-17 [email protected] - Inkyu Park 9 Centrality Bins Triggere d Accepte d

Normalized Paddle Signal Acceptance affected by various strict vertex cut s 2000-01-17 [email protected] - Inkyu Park 10 Event Plane Reconstruction n = tan-1 ( Xn / Yn ) / n Yn n (Xn,Yn)=w cos(n), w sin(n) ) (pixel number) Xn Z (pixel number)

w is weight to compensate for detector related azimuthal asymmetries (inverse of hit density) 2000-01-17 [email protected] - Inkyu Park 11 Particle distribution w.r.t. Event Plane N V 2 2000-01-17 [email protected] - Inkyu Park 12 Flow Analysis* (Subevent correlation) If we know the reaction plane perfectly: Vn = < cos (n(R)) >

-2.0 < < -0.1 0.1 < < RingN n a nb SubE (a) SubE (b) 2.0 RingP In real experiment, R is unknown: use n Vnobs = < cos (n(n)) > )1/2 Finally, correct for event plane resolution Vn= Vnobs / < cos (n(n R)) >

* Phys. Rev. C 58, 1671 A. M. Poskanzer, S. A. Voloshin 2000-01-17 [email protected] - Inkyu Park 13 Subevent Plane Correlation Normalized Paddle Signal 2000-01-17 [email protected] - Inkyu Park 14 Occupancy Correction V2raw = < cos (2(hit2)) > With our hit counting method, high occupancy reduces flow signal

MC Occupancy = fraction of hit pads V2corr = V2raw / (1 -Occ) Independent of the magnitude of flow Centrality bin V2 = V2corr / cos (2(a b)) > )1/2 2000-01-17 [email protected] - Inkyu Park 15 Centrality Dependence V2 PHOBOS Preliminary midrapidity : || < 1.0

2000-01-17 Centrality bin [email protected] - Inkyu Park 16 Centrality Dependence midrapidity : || < 1.0 V2 Hydrodynamic model Preliminary SPS AGS Normalized Paddle Signal Errors are statistical only (systematic errors ~ 0.007) 2000-01-17 (STAR : Normalized Nch )

[email protected] - Inkyu Park 17 Pseudorapidity dependence of V2 V2 Averaged over centrality PHOBOS Preliminary Errors are statistical only (systematic errors ~ 0.007) 2000-01-17 [email protected] - Inkyu Park 18 Pseudorapidity dependence of V2 0.08 V2

PHOBOS Preliminary STAR (PRL) 0.07 SPS NA49 (QM99) 0.06 0.05 Pion (b<11fm) 0.04 0.03 0.02 0.01 0 0 1

2 3 4 5 rapidity 6 PHOBOS Errors are statistical only (systematic errors ~ 0.007) STAR : averaged over their centrality 2000-01-17 [email protected] - Inkyu Park 19 Summary Elliptic Flow at midrapidity reaches 6-7% in

peripheral collisions, and drops in central collisions Elliptic Flow is a strong function of pseudorapidity Indication of sensitivity to V1 (we are studying) Thank you! 2000-01-17 [email protected] - Inkyu Park 20

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