Is hexagonal flow ν₆just a superposition of elliptic ν₂and triangular ν₃flows?

Abstract

Abstract. HYDJET++ model, which combines parametrized hydrodynamics with jets, is employed to study the dependence of the hexagonal flow, v 6 , on the elliptic, v 2 , and triangular, v 3 , flows. Calculations are performed for lead-lead collisions at √ s = 2.76 ATeV with centrality 10% ≤ σ/σ geo ≤ 50%. Hexagonal flow in the model emerges only due to the presence of v 2 and v 3 . Position of its event plane, Ψ 6 , is found to be closer to Ψ 3 for semi-central events, whereas in peripheral reactions it is closer to Ψ 2 , in line with the experimental analysis of the plane correlations. The amplitude of "induced" hexagonal flow is also comparable with that obtained in experiments. It means, in particular, that many features of the v 6 can be explained by interplay of elliptic and triangular flows.

Ultra-relativistic heavy-ion collisions - a hot cocktail of hydrodynamics, resonances and jets

“…Again, jets increase the ratio of about 10% and cause the rise of the high-p T tail at p T ≥ 3 GeV/c. Other details concerning the peculiarities of the hexagonal flow development in HYDJET++ can be found in [16,17,31,34]. …”

Anisotropic flow fluctuations in Pb+Pb collisions at LHC

“…The HYDJET++ model [12][13][14], in contrast, combines parametrised hydrodynamic treatment of soft processes with the description of hard jets traversing hot and dense partonic medium. The interplay between soft hydro-like processes and jets within the HYDJET++ was studied in a number of papers [15][16][17][18][19][20][21][22][23]. The model predicted correctly violation of the numberof-constituent-quark (NCQ) scaling of v 2 at LHC, whereas the scaling certainly holds for hadrons produced in soft processes [15,16], rise of the high-p T tail of v 4 (p T )/v 2 2 (p T ) ratio [17,18], the important role of elliptic and triangular flow non-linear contributions to higher order harmonics [14,[19][20][21] and to the long-range angular di-hadron correlations leading to the formation of characteristic "ridge" structures [22].…”