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Scaling properties of azimuthal anisotropy in Au+Au and Cu+Cu Collisions at sqrt[s NN]=200 GeV |
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| Authors: | Adare A Afanasiev S Aidala C Ajitanand N N Akiba Y Al-Bataineh H Alexander J Al-Jamel A Aoki K Aphecetche L Armendariz R Aronson S H Asai J Atomssa E T Averbeck R Awes T C Azmoun B Babintsev V Baksay G Baksay L Baldisseri A Barish K N Barnes P D Bassalleck B Bathe S Batsouli S Baublis V Bauer F Bazilevsky A Belikov S Bennett R Berdnikov Y Bickley A A Bjorndal M T Boissevain J G Borel H Boyle K Brooks M L Brown D S Bucher D Buesching H Bumazhnov V Bunce G Burward-Hoy J M Butsyk S Campbell S Chai J-S Chang B S Charvet J-L Chernichenko S Chiba J Chi C Y Chiu M Choi I J Chujo T Chung P Churyn A |
| Affiliation: | University of Colorado, Boulder, Colorado 80309, USA. |
| Abstract: | Differential measurements of elliptic flow (v2) for Au+Au and Cu+Cu collisions at sqrt[sNN]=200 GeV are used to test and validate predictions from perfect fluid hydrodynamics for scaling of v2 with eccentricity, system size, and transverse kinetic energy (KE T). For KE T identical with mT-m up to approximately 1 GeV the scaling is compatible with hydrodynamic expansion of a thermalized fluid. For large values of KE T mesons and baryons scale separately. Quark number scaling reveals a universal scaling of v2 for both mesons and baryons over the full KE T range for Au+Au. For Au+Au and Cu+Cu the scaling is more pronounced in terms of KE T, rather than transverse momentum. |
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