E. Zabrodin

Microscopic models and effective equation of state in nuclear collisions in the vicinity of

Two microscopic models, UrQMD and QGSM, were employed to study the formation of locally equilibrated hot and dense nuclear matter in heavy-ion collisions at energies from 11.6A GeV to 160A GeV. Analysis was performed for the fixed central cubic cell of volume V = 125 fm and for the expanding cell which followed the growth of the central area with uniformly distributed energy. To decide whether or not the equilibrium was reached, results of the microscopic calculations were compared to that of the statistical thermal model. Both dynamical models indicate that the state of kinetic, thermal and chemical equilibrium is nearly approached at any bombarding energy after a certain relaxation period. The higher the energy, the shorter the relaxation time. Equation of state has a simple linear dependence P = a( √ s)ε, where a ≡ c2s is the sound velocity squared. It varies from 0.12± 0.01 at Elab = 11.6A GeV to 0.145± 0.005 at Elab = 160A GeV. Change of the slope in a( √ s) behavior occurs at Elab = 40A GeV and can be assigned to the transition from baryon-rich to meson-dominated matter. The phase diagrams in the T − μB plane show the presence of kinks along the lines of constant entropy per baryon. These kinks are linked to the inelastic (i.e. chemical) freeze-out in the system.

E_{\rm lab} = 30A

tic and non-diffractive pp collisions at energies from p s = 200GeV to 14TeV are studied within the Monte Carlo quark-gluon string model. Good agreement with the available experimental data is obtained and predictions are made for the collisions at top LHC energy p s = 14TeV. The model indicates that Feynman scaling and extended longitudinal scaling remain valid in the fragmentation regions, whereas strong violation of Feynman scaling is observed at midrapidity. The KNO scaling in multiplicity distributions is violated at LHC also. The origin of both maintenance and violation of the scaling trends is traced to short range correlations of particles in the strings and interplay between the multi-string processes at ultra-relativistic energies.

GeV at the GSI Facility for Antiproton and Ion Research (FAIR) and beyond

The hybrid model HYDJET++, which combines soft and hard components, is employed for the analysis of dihadron angular correlations measured in PbPb collisions at center-of-mass energy sqrt(s_NN) = 2.76 TeV. The model allows for study both individual contributions and mutual influence of lower flow harmonics, v_2 and v_3, on higher harmonics and dihadron angular correlations. It is shown that the typical structure called ridge in dihadron angular correlations in a broad pseudorapidity range could appear just as interplay of v_2 and v_3. Central, semi-central and semi-peripheral collisions were investigated. Comparison of model results with the experimental data on dihadron angular correlations is presented for different centralities and transverse momenta p_T.

How many of the scaling trends in

We discuss features of charmonium suppression at GeV within the framework of the Glauber–Gribov theory and the comovers interaction model. The latter approach has been extended by allowing for secondary charmonium production due to recombination of pairs in the medium, estimated from pp data at the same bombarding energy. Centrality and rapidity dependence of the nuclear modification factor for J/ψ in d+Au, Cu+Cu and Au+Au collisions at RHIC are reproduced without fitting a single model parameter. A strong suppression of J/ψ is predicted for LHC energies.

pp

Triangular flow

collisions will be violated at sqrt{s_NN} = 14 TeV ? - Predictions from Monte Carlo quark-gluon string model

v_3

Angular dihadron correlations as an interplay between elliptic and triangular flows

of identified and inclusive particles in Pb+Pb collisions at

Charmonium dynamics in dA and AA at RHIC and LHC

sqrt{s_{NN}} = 2.76

Influence of jets and decays of resonances on the triangular flow in ultrarelativistic heavy-ion collisions

TeV is studied as a function of centrality and transverse momentum within the textsc{hydjet++} model. The model enables one to investigate the influence of both hard processes and final-state interactions on the harmonics of particle anisotropic flow. Decays of resonances are found to increase the magnitude of the

Can the RHIC J/ψ puzzle(s) be settled at LHC?

v_3(p_{rm T})