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A critical discussion of the present status of the CERN experiments on charm dynamics and hadron collective flow is given. We emphasize the importance of the flow excitation function from 1 to 50 A$\cdot$GeV: here the hydrodynamic model has…

Nuclear Theory · Physics 2008-11-26 Horst Stoecker

In ultrarelativistic heavy-ion collisions, the Fourier decomposition of the relative azimuthal angle, \Delta \phi, distribution of particle pairs yields a large cos(3\Delta \phi) component, extending out to large rapidity separations \Delta…

Nuclear Theory · Physics 2010-10-06 Burak Han Alver , Clement Gombeaud , Matthew Luzum , Jean-Yves Ollitrault

We show how ultra-relativistic collisions of light nuclei with heavy targets may be used to record snap-shots of the ground-state configurations and reveal information on cluster correlations. The development of collective flow in the…

Nuclear Theory · Physics 2015-06-22 Wojciech Broniowski , Enrique Ruiz Arriola

Within the framework of the quantum molecular dynamics transport model, the collective flows of clusters and pions in heavy-ion collisions have been systematically investigated. The clusters are recognized by the Wigner phase-space density…

Nuclear Theory · Physics 2023-08-21 Heng-Jin Liu , Hui-Gan Cheng , Zhao-Qing Feng

Elliptic flow ($v_2$) in ultrarelativistic nucleus-nucleus collisions fluctuates event to event, both in magnitude and in orientation with respect to the reaction plane. Even though the reaction plane is not known event to event in…

Nuclear Theory · Physics 2019-03-05 Rajeev S. Bhalerao , Giuliano Giacalone , Jean-Yves Ollitrault

The triangular flow in ultrarelativistic $^3$He-Au collisions at RHIC energies is enhanced due to the triangular arrangement of the nucleon configurations in $^3$He. We study the fireball eccentricities in the Glauber Monte Carlo model and…

Nuclear Theory · Physics 2015-06-22 Piotr Bozek , Wojciech Broniowski

In this proceedings, we report measurements of the third harmonic coefficient of the azimuthal anisotropy, $v_{3}$, known as triangular flow. The analysis is for charged particles near midrapidity in Au+Au collisions at $\sqrt {s_{NN}} $ =…

Nuclear Experiment · Physics 2019-08-13 Yadav Pandit

We calculate the elliptic flow parameter $v_2$ for Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV employing the parton cascade BAMPS (Boltzmann Approach of Multiparton Scatterings). Besides gluon interactions including the bremsstrahlung…

High Energy Physics - Phenomenology · Physics 2010-05-12 Zhe Xu , Carsten Greiner

The azimuthal anisotropy coefficients $v_{2,3,4}$, characterizing collective flow in Au+Au collisions, are presented for identified particle species as a function of transverse momentum ($p_T$), centrality ($\rm{cent}$) and beam collision…

Nuclear Experiment · Physics 2019-08-13 Yi Gu

In this talk I present new STAR results on measurements of integrated elliptic flow at midrapidity in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}=$200 and 62 GeV energies. These results have been obtained from azimuthal correlations…

Nuclear Experiment · Physics 2009-11-11 Sergei A. Voloshin

The spatial configuration of initial partons in high-multiplicity proton-proton scatterings at 14 TeV is assumed as three randomly positioned "hot spots". The parton momentum distribution in the hot spots is calculated by HIJING2.0 with…

High Energy Physics - Phenomenology · Physics 2015-06-03 Wei-Tian Deng , Zhe Xu , Carsten Greiner

Quantum fluctuations plays an essential role in forming the collective flow of hadrons observed in relativistic heavy-ion collisions. Event-by-event fluctuations of the collective flow can arise from various sources, such as the…

Nuclear Theory · Physics 2024-07-09 Xinrong Chen , Xiang-Yu Wu , Shanshan Cao , Guang-You Qin

We investigate the robustness of the discovery of the perfect fluid through comparison of hydrodynamic calculations with the elliptic flow coefficient v_2 at midrapidity in Au+Au collisions at sqrt{s_{NN}}=200 GeV. Employing the Glauber…

Nuclear Theory · Physics 2008-11-26 Tetsufumi Hirano , Ulrich W. Heinz , Dmitri Kharzeev , Roy Lacey , Yasushi Nara

We have obtained a new set of parameters in a multiphase transport (AMPT) model that are able to describe both the charged particle multiplicity density and elliptic flow measured in Au+Au collisions at center of mass energy…

Nuclear Theory · Physics 2011-07-21 Jun Xu , Che Ming Ko

We consider various methods of flow analysis in heavy ion collisions and compare experimental data on corresponding observables to the predictions of our saturation model proposed earlier. We demonstrate that, due to the nature of the…

Nuclear Theory · Physics 2009-11-07 Yuri V. Kovchegov , Kirill L. Tuchin

We show that backward-forward elliptic anisotropy correlation provides an experimentally accessible observable which distinguishes between collective and non-collective contributions to the observed elliptic anisotropy $v_2$ in relativistic…

Nuclear Theory · Physics 2009-09-02 Jinfeng Liao , Volker Koch

The directed flow of particles produced in ultrarelativistic heavy ion collisions at SPS and RHIC is so small that currently available methods of analysis are at the border of applicability. Standard two-particle and flow-vector methods are…

Nuclear Theory · Physics 2009-11-07 N. Borghini , P. M. Dinh , J. -Y. Ollitrault

Elliptic flow, $v_2$, and triangular flow, $v_3$, are to a good approximation linearly proportional to the corresponding spatial anisotropies of the initial density profile, $\varepsilon_2$ and $\varepsilon_3$. Using event-by-event…

Nuclear Theory · Physics 2017-05-25 Giuliano Giacalone , Jacquelyn Noronha-Hostler , Jean-Yves Ollitrault

Recent observations of long-range multi-particle azimuthal correlations in p--Pb and high multiplicity pp collisions provided new insights into collision dynamics and opened a possibility to study collective effects in these small systems.…

Nuclear Experiment · Physics 2019-02-07 Vojtěch Pacík

Collective flow has been found to be similar between small colliding systems ($p$ $+$ $p$ and $p$ $+$ A collisions) and large colliding systems (peripheral A $+$ A collisions) at the CERN Large Hadron Collider. In order to study the…

Nuclear Theory · Physics 2024-08-30 Shuang Guo , Han-Sheng Wang , Kai Zhou , Guo-Liang Ma