Novel Developments of HYDJET++ Model for Ultra-relativistic Heavy-Ion Collisions

The HYDrodynamics with JETs (HYDJET++) model is applied for the description of ultra-relativistic heavy-ion collisions, particularly, the azimuthal anisotropy phenomena. The interplay of soft hydro-like processes and jets is able to describe the violation of the mass hierarchy of meson and baryon elliptic and triangular flows at \(p_\mathrm{T} \ge 2\) GeV/c, the fall-off of the anisotropic flow harmonics at intermediate transverse momenta, and the worsening of the number-of-constituent-quark (NCQ) scaling of elliptic/triangular flow at LHC compared to RHIC energies. The cross-talk of \(v_2\) and \(v_3\) leads to emergence of higher order harmonics in the model and to appearance of ridge structure in dihadron angular correlations in a broad pseudorapidity range. Recently, the model was further extended to describe quantitatively the event-by-event fluctuations of the anisotropic flow. The model calculations agree well with the experimental data.