System size, energy, pseudorapidity, and centrality dependence of elliptic flow |
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| Authors: | Alver B Back B B Baker M D Ballintijn M Barton D S Betts R R Bickley A A Bindel R Busza W Carroll A Chai Z Chetluru V Decowski M P García E Gburek T George N Gulbrandsen K Halliwell C Hamblen J Harnarine I Hauer M Henderson C Hofman D J Hollis R S Ho?yński R Holzman B Iordanova A Johnson E Kane J L Khan N Kulinich P Kuo C M Li W Lin W T Loizides C Manly S Mignerey A C Nouicer R Olszewski A Pak R Reed C Richardson E Roland C Roland G Sagerer J Seals H Sedykh I Smith C E Stankiewicz M A Steinberg P Stephans G S F Sukhanov A Szostak A Tonjes M B Trzupek A Vale C van Nieuwenhuizen G J |
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| Institution: | Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA. |
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| Abstract: | This Letter presents measurements of the elliptic flow of charged particles as a function of pseudorapidity and centrality from Cu-Cu collisions at 62.4 and 200 GeV using the PHOBOS detector at the Relativistic Heavy Ion Collider. The elliptic flow in Cu-Cu collisions is found to be significant even for the most central events. For comparison with the Au-Au results, it is found that the detailed way in which the collision geometry (eccentricity) is estimated is of critical importance when scaling out system-size effects. A new form of eccentricity, called the participant eccentricity, is introduced which yields a scaled elliptic flow in the Cu-Cu system that has the same relative magnitude and qualitative features as that in the Au-Au system. |
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