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In relativistic heavy-ion collisions, event-by-event fluctuations are known to have non-trivial implications. Even though the probability distribution is geometrically isotropic for the initial conditions, the anisotropic $\varepsilon_n$…

核理论 · 物理学 2023-04-04 Wei-Liang Qian , Kai Lin , Chong Ye , Jin Li , Yu Pan , Rui-Hong Yue

We discuss how the different estimates of elliptic flow are influenced by flow fluctuations and nonflow effects. It is explained why the event-plane method yields estimates between the two-particle correlation methods and the multiparticle…

核实验 · 物理学 2009-08-18 Jean-Yves Ollitrault , Arthur M. Poskanzer , Sergei A. Voloshin

This paper presents the first measurement of event-by-event fluctuations of the elliptic flow parameter v_2 in Au+Au collisions at sqrt(s_NN) = 200GeV as a function of collision centrality. The relative non-statistical fluctuations of the…

核实验 · 物理学 2019-08-14 B. Alver

We investigate the effects of saturation dynamics on midrapidity flow observables by adding fluctuating hotspots into the novel Monte Carlo EKRT (MC-EKRT) event generator for high-energy nuclear collisions. We demonstrate that the intensity…

高能物理 - 唯象学 · 物理学 2024-07-02 Henry Hirvonen , Mikko Kuha , Jussi Auvinen , Kari J. Eskola , Yuuka Kanakubo , Harri Niemi

The effects of initial state fluctuations on elliptic flow are investigated within a (3+1)d Boltzmann + hydrodynamics transport approach. The spatial eccentricity ($\epsilon_{\rm RP}$ and $\epsilon_{\rm part}$) is calculated for initial…

核理论 · 物理学 2010-05-28 Hannah Petersen , Marcus Bleicher

The strong fluctuations in the initial energy density of heavy-ion collisions allow an efficient selection of events corresponding to a specific initial geometry. For such "shape engineered events", the elliptic flow coefficient, $v_2$, of…

核实验 · 物理学 2019-08-13 A. Dobrin

We study the relation between elliptic flow, $v_2$ and the initial eccentricity, $\varepsilon_2$, in heavy-ion collisions, using hydrodynamic simulations. Significant deviations from linear eccentricity scaling are seen in more peripheral…

Differential studies of elliptic flow are one of the most powerful tools in studying the initial conditions and dynamical evolution of heavy ion collisions. The comparison of data from Cu+Cu and Au+Au collisions taken with the PHOBOS…

核实验 · 物理学 2019-08-14 Constantin Loizides

We present a systematic study of the effects due to initial condition fluctuations in systems formed by heavy-ion collisions using the hydrodynamical simulation code NeXSPheRIO. The study was based on a sample of events generated simulating…

高能物理 - 唯象学 · 物理学 2012-06-04 Rafael Derradi de Souza , Jun Takahashi , Takeshi Kodama , Paul Sorensen

Recently it has become apparent that event-by-event fluctuations in the initial state of hydrodynamical modelling of ultrarelativistic heavy-ion collisions are crucial in order to understand the full centrality dependence of the elliptic…

高能物理 - 唯象学 · 物理学 2015-05-28 Thorsten Renk , Hannu Holopainen , Jussi Auvinen , Kari J. Eskola

The azimuthal correlations between local flow planes at different (pseudo)rapidities ($\eta$) may reveal important details of the initial nuclear matter density distributions in heavy-ion collisions. Extensive experimental measurements of a…

核实验 · 物理学 2022-02-09 Zhiwan Xu , Xiatong Wu , Caleb Sword , Gang Wang , Sergei A. Voloshin , Huan Zhong Huang

The nucleation process of polyethylene under quiescent and shear flow conditions are comparatively studied with all_atom molecular dynamical simulations. At both conditions, nucleation are demonstrated to be two_step processes, which,…

软凝聚态物质 · 物理学 2021-12-08 Xiaoliang Tang , Junsheng Yang , Fucheng Tian , Tingyu Xu , Chun Xie , Liangbin Li

A comparison is made between results obtained using smooth initial conditions and event-by-event initial conditions in the hydrodynamical description of relativistic nuclear collisions. Some new results on directed flow are also included.

Event-by-event fluctuations and correlations between particles produced in relativistic nuclear collisions are studied. The fluctuations in positive, negative, total and net charge are closely related through correlations. In the event of a…

核理论 · 物理学 2008-11-26 H. Heiselberg , A. D. Jackson

We present a number of independent flow observables that can be measured using multiparticle azimuthal correlations in heavy-ion collisions. Some of these observables are already well known, such as v2{2} and v2{4}, but most are new--in…

核理论 · 物理学 2012-06-18 Rajeev S. Bhalerao , Matthew Luzum , Jean-Yves Ollitrault

The study of the peculiarities of the distribution of secondary particles depending on the degree centrality and the degree of asymmetry of the interacting nuclei, is performed. The number of multicharged fragments of the projectile nucleus…

核理论 · 物理学 2014-11-04 A. Sh. Gaitinov , I. A. Lebedev , A. I. Fedosimova

We report on results obtained with the Event Shape Engineering technique applied to Pb-Pb collisions at $\sqrt{s_\rm{NN}}=2.76$ TeV. By selecting events in the same centrality interval, but with very different average flow, different…

核实验 · 物理学 2016-04-12 ALICE Collaboration

An interesting opportunity to determine thermodynamic and transport properties in more detail is to identify generic statistical properties of initial density perturbations. Here we study event-by-event fluctuations in terms of correlation…

高能物理 - 唯象学 · 物理学 2014-08-29 Stefan Floerchinger , Urs Achim Wiedemann

Hadron spectra and elliptic flow in relativistic heavy-ion collisions are studied in event-by-event (3+1)D ideal hydrodynamic simulations with fluctuating initial conditions given by the AMPT Monte Carlo model. Both the coherent soft gluon…

核理论 · 物理学 2015-06-12 Longgang Pang , Qun Wang , Xin-Nian Wang

Anisotropic flows ($v_1$, $v_2$ and $v_4$) of light nuclear clusters are studied by a nucleonic transport model in intermediate energy heavy ion collisions. The number-of-nucleon scalings of the directed flow ($v_1$) and elliptic flow…