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Aidala, C.; Aoki, K.; Ayuso, C.; Belmont, R.; Berdnikov, A.; Berdnikov, Y.; Boer, M.; Bok, J. S.; Brooks, M. L.; Canoa Roman, V.; Chiu, M.; Danley, T. W.; Daugherity, M. S.; Dehmelt, K.; Deshpande, A.; Desmond, E. J.; Durham, J. M.; Elder, T.; Enokizono, A.; Fields, D. E.; Goto, Y.; Greene, S. V.; Gunji, T.; Haggerty, J. S.; Hahn, K. I.; He, X.; Hill, K.; Homma, K.; Hoshino, T.; Hotvedt, N.; Ivanishchev, D.; Johnson, B. M.; Jorjadze, V.; Jouan, D.; Kang, J. H.; Kazantsev, A. V.; Kim, D. J.; Kim, M. H.; Kincses, D.; Kistenev, E.; Kotov, D.; Kudo, S.; Lallow, E. O.; Lee, S. H.; Leung, Y. H.; Li, X.; Liu, L. D.; Loggins, V.-R.; Lökös, S.; Lynch, D.; Malaev, M.; McCumber, M.; McGlinchey, D.; Metzger, W. J.; Mignerey, A. C.; Milov, A.; Mishra, D. K.; Moon, T.; Murakami, T.; Nagai, K.; Nagashima, T.; Nagle, J. L.; Novotny, R.; Nyanin, A. S.; Ogilvie, C. A.; Osborn, J. D.; Ozawa, K.; Patel, M.; Peng, W.; Phipps, M.; Purschke, M. L.; Riabov, Y.; Rinn, T.; Rosati, M.; Rowan, Z.; Sakaguchi, T.; Sato, S.; Sen, A.; Shibata, T.-A.; Shimomura, M.; Skoby, M. J.; Slunečka, M.; Soltz, R. A.; Sourikova, I. V.; Stankus, P. W.; Sugitate, T.; Timilsina, A.; Tomášek, M.; Ujvari, B.; van Hecke, H. W.; Velkovska, J.; Wang, X. R.; Wang, Z.; Xu, C.; Xu, Q.; Yamaguchi, Y. L.; Yanovich, A.; Yin, P.; Yoon, I.; Yushmanov, I. E.
Physical review. C, 12/2017, Letnik: 96, Številka: 6Journal Article
We present measurements of the elliptic flow (v2) as a function of transverse momentum (pT), pseudorapidity (η), and centrality in d+Au collisions at √sNN = 200, 62.4, 39, and 19.6 GeV. The beam-energy scan of d+Au collisions provides a testing ground for the onset of ow signatures in small collision systems. We measure a nonzero v2 signal at all four collision energies, which, at midrapidity and low pT, is consistent with predictions from viscous hydrodynamic models. Comparisons with calculations from parton transport models (based on the ampt Monte Carlo generator) show good agreement with the data at midrapidity to forward (d-going) rapidities and low pT. At backward (Au-going) rapidities and pT > 1:5 GeV/c, the data diverges from ampt calculations of v2 relative to the initial geometry, indicating the possible dominance of nongeometry related corre- lations, referred to as nonflow. We also present measurements of the charged-particle multiplicity (dNch/d ) as a function of η in central d+Au collisions at the same energies. We find that in d+Au collisions at √sNN = 200 GeV the v2 scales with dNch/d over all in the PHENIX acceptance. At √sNN = 62:4, and 39 GeV, v2 scales with dNch/d at midrapidity and forward rapidity, but falls o at backward rapidity. Furthermore, this departure from the dNch/dη scaling may be a further indication of non ow effects dominating at backward rapidity.
