53 research outputs found
Influence of resonance decays on triangular flow in heavy-ion collisions
Anisotropic flow in relativistic collisions of heavy-ions yields important information about the state of the hot and dense matter created in the collision. Study of triangular flow in Pb+Pb collisions at LHC was performed using HYDJET++ Monte Carlo generator. HYDJET++ combines both hydrodynamics-driven soft part together with hard jet-part, giving a realistic prediction for vast number of hadron species. The model also enables study of influence of final-state interactions on flow of created hadrons. Triangular flow patterns of pions, kaons and protons were studied. We found that resonance decays influence significantly the shape of the distributions
Higher harmonics of azimuthal anisotropy in relativistic heavy ion collisions in HYDJET++ model
The LHC data on azimuthal anisotropy harmonics from PbPb collisions at
center-of-mass energy 2.76 TeV per nucleon pair are analyzed and interpreted in
the framework of the HYDJET++ model. The cross-talk of elliptic and
triangular flow in the model generates both even and odd harmonics of
higher order. Comparison with the experimental data shows that this mechanism
is able to reproduce the and centrality dependencies of
quadrangular flow , and also the basic trends for pentagonal and
hexagonal flows.Comment: 12 pages including 13 figures as EPS-files; prepared using LaTeX
package for publication in the European Physical Journal
Elliptic flow studies using the CMS detector
The azimuthal anisotropy of charged particles in heavy ion collisions is an important probe of quark-gluon plasma evolution at early stages. The nuclear reaction plane can be determined independently by different detector subsystems and using different analysis methods. This paper reports the capability of the CMS detector at the LHC to reconstruct the reaction plane of the collision and to me asure elliptic flow with calorimetry and a tracking system. The analysis is based on a full CMS detector simulation of \rm{Pb+Pb} events with the HYDJET event generator
Influence of jets and resonance decays on the constituent quark scaling of elliptic flow
The Monte Carlo HYDJET++ model, that contains both hydrodynamic state and
jets, is applied to study the influence of the interplay between soft and hard
processes on the formation of the elliptic flow in heavy-ion collisions at RHIC
and LHC energies. Jets are found to cease the hydro-like increase of the
elliptic flow with rising p_T. Since jets are more influential at LHC than at
RHIC, the v_2 at LHC should be weaker than that at RHIC. Violation of the
number-of-constituent-quark (NCQ) scaling is predicted. The decays of
resonances are found to enhance the low-p_T part of the elliptic flow of pions
and light baryons, and work toward the fulfillment of the NCQ scaling.Comment: 6 pages, talk given at the International Conference on Strangeness in
Quark Matter 2009 (SQM09
Towards the centrality dependence description of the charge balance function in the HYDJET++ model
Data from the Large Hadron Collider on the charge balance function in Pb+Pb
collisions at center-of-mass energy 2.76 TeV per nucleon pair are analyzed and
interpreted within the framework of the HYDJET++ model. This model allows us to
reproduce the experimentally observed centrality dependence of the balance
function widths at the relatively low transverse momentum intervals
qualitatively due to the different charge creation mechanisms in soft and hard
processes. However, the fully adequate description of the balance function in
these intervals implies the essential model modification by including the exact
charge conservation in terms of the canonical ensemble instead of the grand
canonical one. A procedure is proposed for introducing charge correlations into
the thermal model without changing other model parameters. With increasing
transverse momenta, the default model results describe experimental data much
better because the contribution from the soft component of the model is
significantly reduced in these transverse momentum intervals. In practice,
there is a transition to a single source of charge correlations, namely, charge
correlations in jets for which the exact charge conservation takes place at
each stage.Comment: REVTEX, 8 pages, 6 figure
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