Abstract.
The common interpretation of elliptic flow \( v_2\) in heavy-ion collisions is that it is produced by hydrodynamic flow at low transverse momentum and by parton energy loss at high transverse momentum. Here, we discuss this interpretation in view of the dependence of \( v_2\) on energy, rapidity and system size, and show that it is far from clear how the relevant properties necessary for this interpretation, low viscosity and high opacity, turn on. A low-energy collider such as NICA is essential for this interpretation to be verified, understood and related to the fundamental properties of hadronic matter.
Similar content being viewed by others
References
M. Gyulassy, L. McLerran, Nucl. Phys. A 750, 30 (2005)
M. Gyulassy, P. Levai, I. Vitev, Phys. Rev. Lett. 85, 5535 (2000)
R. Baier, Y.L. Dokshitzer, A.H. Mueller, S. Peigne, D. Schiff, Nucl. Phys. B 484, 265 (1997)
C. Shen, S.A. Bass et al., J. Phys. G 38, 124045 (2011)
J.Y. Ollitrault, Phys. Rev. D 46, 229 (1992)
F. Cooper, G. Frye, Phys. Rev. D 10, 186 (1974)
O. Fochler, J. Uphoff, Z. Xu, C. Greiner, J. Phys. G 38, 124152 (2011)
P.M. Chesler, K. Jensen, A. Karch, L.G. Yaffe, Phys. Rev. D 79, 125015 (2009)
CMS Collaboration (S. Chatrchyan), arXiv:1204.1409
PHENIX Collaboration (A. Adare et al.), Phys. Rev. Lett. 111, 212301 (2013)
B.B. Back et al., Nucl. Phys. A 757, 28 (2005)
STAR Collaboration (L. Adamczyk), arXiv:1206.5528
PHENIX Collaboration (A. Adare et al.), Phys. Rev. Lett. 98, 162301 (2007)
BRAHMS Collaboration (F. Videbaek), Nucl. Phys. A 830, 43C (2009)
CMS Collaboration (S. Chatrchyan et al.), Phys. Lett. B 724, 213 (2013)
G. Torrieri, Phys. Rev. C 89, 024908 (2014)
G. Torrieri, Phys. Rev. C 82, 054906 (2010) arXiv:0911.4775 [nucl-th]
G. Torrieri, Phys. Rev. C 76, 024903 (2007)
Y. Hatta, J. Noronha, G. Torrieri, B.W. Xiao, Phys. Rev. D 90, 074026 (2014)
H. Song, U.W. Heinz, Phys. Rev. C 78, 024902 (2008)
E. Schnedermann, J. Sollfrank, U.W. Heinz, Phys. Rev. C 48, 2462 (1993)
H. Niemi, G.S. Denicol, P. Huovinen, E. Molnar, D.H. Rischke, Phys. Rev. C 86, 014909 (2012)
J. Aichelin, K. Werner, J. Phys. G 37, 094006 (2010)
K. Dusling, D. Teaney, Phys. Rev. C 77, 034905 (2008)
C. Shen, U. Heinz, Phys. Rev. C 85, 054902 (2012) 86
D. Solanki, P. Sorensen, S. Basu, R. Raniwala, T.K. Nayak, Phys. Lett. B 720, 352 (2013)
H. Petersen, Q. Li, X. Zhu, M. Bleicher, Phys. Rev. C 74, 064908 (2006) hep-ph/0608189
G.S. Denicol, C. Gale, S. Jeon, J. Noronha, Phys. Rev. C 88, 064901 (2013)
J.C. Dunlop, M.A. Lisa, P. Sorensen, Phys. Rev. C 84, 044914 (2011)
V. Greco, M. Mitrovski, G. Torrieri, arXiv:1201.4800
J. Xu, J. Liao, M. Gyulassy, arXiv:1508.00552
B. Betz, M. Gyulassy, G. Torrieri, Phys. Rev. C 84, 024913 (2011)
CMS Collaboration (S. Chatrchyan), arXiv:1204.1850
STAR Collaboration (D. McDonald), EPJ Web of Conferences 95, 01009 (2015)
K. Dusling, G.D. Moore, D. Teaney, Phys. Rev. C 81, 034907 (2010)
S.A. Voloshin, A.M. Poskanzer, R. Snellings, arXiv:0809.2949 [nucl-ex]
Author information
Authors and Affiliations
Corresponding author
Additional information
Communicated by D. Blaschke
Rights and permissions
About this article
Cite this article
Torrieri, G. Scaling in heavy-ion collisions and the low-energy frontier. Eur. Phys. J. A 52, 249 (2016). https://doi.org/10.1140/epja/i2016-16249-0
Received:
Accepted:
Published:
DOI: https://doi.org/10.1140/epja/i2016-16249-0