Anisotropic parton escape is the dominant source of azimuthal anisotropy in transport models

Journal Article · Mon Feb 01 00:00:00 EST 2016 · Physics Letters B

DOI:https://doi.org/10.1016/j.physletb.2015.12.051· OSTI ID:1234183

He, Liang; Edmonds, Terrence; Lin, Zi-Wei; Liu, Feng; Molnar, Denes; Wang, Fuqiang

We trace the development of azimuthal anisotropy (v_n, n = 2, 3) via parton-parton collision history in two transport models. The parton v_n is studied as a function of the number of collisions of each parton in Au+Au and d+Au collisions at √ s_NN = 200 GeV. Findings show that the majority of v_n comes from the anisotropic escape probability of partons, with no fundamental difference at low and high transverse momenta. The contribution to v_n from hydrodynamic-type collective flow is found to be small. Only when the parton-parton cross-section is set unrealistically large does this contribution start to take over. Our findings challenge the current paradigm emerged from hydrodynamic comparisons to anisotropy data.

• Research Organization: Purdue Univ., West Lafayette, IN (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: FG02-88ER40412; FG02-13ER16413
• OSTI ID: 1234183
• Alternate ID(s): OSTI ID: 1242352
• Journal Information: Physics Letters B, Journal Name: Physics Letters B Vol. 753 Journal Issue: C; ISSN 0370-2693
• Publisher: Elsevier
• Country of Publication: Netherlands
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
quark-gluon plasma
anisotropic flow
transport model
hydrodynamics