A hydrodynamic model including phase transition and the thermal motion-induced transverse momentum distributions in high energy heavy ion collisions

2017 ◽  
Vol 26 (07) ◽  
pp. 1750045
Author(s):  
Z. J. Jiang ◽  
J. Q. Hui ◽  
Y. Zhang
Keyword(s):  
Phase Transition ◽  
Transverse Momentum ◽  
Hydrodynamic Model ◽  
Good Description ◽  
Heavy Ion ◽  
High Energy ◽  
Thermal Motion ◽  
Ion Collisions ◽  
Momentum Distributions ◽  
Theoretical Predictions

By taking into account the effects of thermal motion, the transverse momentum distributions of identified charged particles produced in nucleus collisions are discussed in the context of a hydrodynamic model including phase transition. A comparison is made between the theoretical predictions and experimental measurements. The theoretical model gives a good description to the data collected in Au–Au collisions at RHIC energy of [Formula: see text][Formula: see text]GeV. For Pb–Pb collisions at LHC energy of [Formula: see text][Formula: see text]TeV, the model works well up to the transverse momentum of about [Formula: see text][Formula: see text]GeV/c.

scholarly journals Freeze-Out Parameters in Heavy-Ion Collisions at AGS, SPS, RHIC, and LHC Energies

2015 ◽  
Vol 2015 ◽  
pp. 1-20 ◽  
Author(s):  
Sandeep Chatterjee ◽  
Sabita Das ◽  
Lokesh Kumar ◽  
D. Mishra ◽  
Bedangadas Mohanty ◽  
...  
Keyword(s):  
Transverse Momentum ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
High Energy ◽  
Particle Multiplicity ◽  
Charged Particle Multiplicity ◽  
Ion Collisions ◽  
Momentum Distributions ◽  
Chemical Freeze ◽  
Freeze Out

We review the chemical and kinetic freeze-out conditions in high energy heavy-ion collisions for AGS, SPS, RHIC, and LHC energies. Chemical freeze-out parameters are obtained using produced particle yields in central collisions while the corresponding kinetic freeze-out parameters are obtained using transverse momentum distributions of produced particles. For chemical freeze-out, different freeze-out scenarios are discussed such as single and double/flavor dependent freeze-out surfaces. Kinetic freeze-out parameters are obtained by doing hydrodynamic inspired blast wave fit to the transverse momentum distributions. The beam energy and centrality dependence of transverse energy per charged particle multiplicity are studied to address the constant energy per particle freeze-out criteria in heavy-ion collisions.

scholarly journals Centrality Dependence of Deuteron Production in PbPb Collisions at 2.76 TeV via Hydrodynamics and Hadronic Afterburner +

Proceedings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 6
Author(s):  
Dmytro Oliinychenko ◽  
Long-Gang Pang ◽  
Hannah Elfner ◽  
Volker Koch
Keyword(s):  
Transverse Momentum ◽  
Good Description ◽  
Hybrid Approach ◽  
Heavy Ion ◽  
High Energy ◽  
Central Collisions ◽  
Ion Collisions ◽  
Momentum Spectra ◽  
Transverse Momentum Spectra ◽  
Deuteron Production

The deuteron binding energy is only 2.2 MeV. At the same time, its yield in Pb+Pb collisionsatpsNN = 2.76 TeV corresponds to a thermal yield at the temperature around 155 MeV, which is toohot to keep deuterons bound. This puzzle is not completely resolved yet. In general, the mechanism oflight nuclei production in ultra-high energy heavy ion collisions remains under debate. In a previouswork we suggest a microscopic explanation of the deuteron production in central ultra-relativisticPb+Pb collisions, the main mechanism being ppn $ pd reactions in the hadronic phase of thecollision. We use a state-of-the-art hybrid approach, combining relativistic hydrodynamics for the hotand dense stage and hadronic transport for a later, more dilute stage. Deuteron rescattering in thehadronic stage is implemented explicitly, using its experimentally measured vacuum cross-sections.In these proceedings we extend our previous work to non-central collisions, keeping exactly thesame methodology and parameters. We find that our approach leads to a good description of themeasured deuteron transverse momentum spectra at centralities up to 40%, and underestimatesthe amount of deuterons at low transverse momentum at higher centralities. Nevertheless, thecoalescence parameter B2, measured by ALICE collaboration, is reproduced well in our approacheven for peripheral collisions.

scholarly journals The Rapidity Distributions and the Thermalization Induced Transverse Momentum Distributions in Au-Au Collisions at RHIC Energies

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Zhi-Jin Jiang ◽  
Jia-Qi Hui ◽  
Yu Zhang
Keyword(s):  
Transverse Momentum ◽  
Heavy Ion Collisions ◽  
Good Description ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Ion Collisions ◽  
Hadronic State ◽  
Momentum Distributions ◽  
Rapidity Distributions ◽  
Made In

It is widely believed that the quark-gluon plasma (QGP) might be formed in the current heavy ion collisions. It is also widely recognized that the relativistic hydrodynamics is one of the best tools for describing the process of expansion and hadronization of QGP. In this paper, by taking into account the effects of thermalization, a hydrodynamic model including phase transition from QGP state to hadronic state is used to analyze the rapidity and transverse momentum distributions of identified charged particles produced in heavy ion collisions. A comparison is made between the theoretical results and experimental data. The theoretical model gives a good description of the corresponding measurements made in Au-Au collisions at RHIC energies.

scholarly journals A Description of the Transverse Momentum Distributions of Charged Particles Produced in Heavy Ion Collisions at RHIC and LHC Energies

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Jia-Qi Hui ◽  
Zhi-Jin Jiang ◽  
Dong-Fang Xu
Keyword(s):  
Transverse Momentum ◽  
Heavy Ion Collisions ◽  
Good Description ◽  
Charged Particles ◽  
Heavy Ion ◽  
Ion Collisions ◽  
Nonextensive Statistics ◽  
Long Range Interactions ◽  
Momentum Distributions ◽  
Momentum Region

By assuming the existence of memory effects and long-range interactions, nonextensive statistics together with relativistic hydrodynamics including phase transition are used to discuss the transverse momentum distributions of charged particles produced in heavy ion collisions. It is shown that the combined contributions from nonextensive statistics and hydrodynamics can give a good description of the experimental data in Au+Au collisions at sNN=200 GeV and in Pb+Pb collisions at sNN=2.76 TeV for π± and K± in the whole measured transverse momentum region and for pp- in the region of pT≤2.0 GeV/c. This is different from our previous work using the conventional statistics plus hydrodynamics, where the describable region is only limited in pT≤1.1 GeV/c.

THE HYDRODYNAMIC DESCRIPTION OF THE ENERGY AND CENTRALITY DEPENDENCES OF THE PSEUDORAPIDITY DISTRIBUTIONS OF THE PRODUCED CHARGED PARTICLES IN Au+Au COLLISIONS

2013 ◽  
Vol 22 (09) ◽  
pp. 1350069 ◽  
Author(s):  
ZHIJIN JIANG ◽  
QINGGUANG LI ◽  
GUANXIANG JIANG
Keyword(s):  
Hydrodynamic Model ◽  
Charged Particles ◽  
Heavy Ion ◽  
High Energy ◽  
Hydrodynamic Description ◽  
Gaussian Form ◽  
Ion Collisions ◽  
Phobos Collaboration ◽  
Rapidity Distributions ◽  
Pseudorapidity Distributions

By using the revised Landau hydrodynamic model and taking into account the effect of leading particles, we discuss the pseudorapidity distributions of produced charged particles in high energy heavy-ion collisions. The charged particles resulted from the freeze-out of the matter produced in collisions possess the Gaussian-like rapidity distributions. The leading particles are assumed having the rapidity distributions of the Gaussian form with the normalization constant being equal to the number of participants, which can be figured out in theory. It is found that the results from the revised Landau hydrodynamic model together with the contributions from leading particles are well consistent with the experimental data carried out by BNL-RHIC-PHOBOS Collaboration in different centrality Au + Au collisions at energies of [Formula: see text], 130 and 62.4 GeV , respectively.

scholarly journals CRITICAL PHENOMENA IN DEEP INELASTIC SCATTERING

2010 ◽  
Vol 25 (31) ◽  
pp. 5667-5682 ◽  
Author(s):  
L. L. JENKOVSZKY ◽  
ANDREA NAGY ◽  
S. M. TROSHIN ◽  
JOLÁN TURÓCI ◽  
N. E. TYURIN
Keyword(s):  
Phase Transition ◽  
Inelastic Scattering ◽  
Deep Inelastic Scattering ◽  
Deeply Virtual Compton Scattering ◽  
Virtual Compton Scattering ◽  
Heavy Ion ◽  
High Energy ◽  
Ion Collisions ◽  
Bjorken X ◽  
Insight Into

Saturation in deep inelastic scattering and deeply virtual Compton scattering is associated with a phase transition between the partonic gas, typical of moderate x and Q2, and partonic fluid appearing at increasing Q2 and decreasing Bjorken x. In this paper we do not intend to propose another parametrization of the structure function; instead we suggest a new insight into the internal structure of the nucleon, as seen in deep inelastic scattering, and its connection with that revealed in high-energy nucleons and heavy-ion collisions.

scholarly journals On Pseudorapidity Distribution and Speed of Sound in High Energy Heavy Ion Collisions Based on a New Revised Landau Hydrodynamic Model

2015 ◽  
Vol 2015 ◽  
pp. 1-23 ◽  
Author(s):  
Li-Na Gao ◽  
Fu-Hu Liu
Keyword(s):  
Speed Of Sound ◽  
Hydrodynamic Model ◽  
Quark Gluon Plasma ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
High Energy ◽  
Relativistic Heavy Ion Collider ◽  
Central Source ◽  
Ion Collisions

We propose a new revised Landau hydrodynamic model to study systematically the pseudorapidity distributions of charged particles produced in heavy ion collisions over an energy range from a few GeV to a few TeV per nucleon pair. The interacting system is divided into three sources, namely, the central, target, and projectile sources, respectively. The large central source is described by the Landau hydrodynamic model and further revised by the contributions of the small target/projectile sources. The modeling results are in agreement with the available experimental data at relativistic heavy ion collider, large hadron collider, and other energies for different centralities. The value of square speed of sound parameter in different collisions has been extracted by us from the widths of rapidity distributions. Our results show that, in heavy ion collisions at energies of the two colliders, the central source undergoes a phase transition from hadronic gas to quark-gluon plasma liquid phase; meanwhile, the target/projectile sources remain in the state of hadronic gas. The present work confirms that the quark-gluon plasma is of liquid type rather than being of a gas type.

scholarly journals Probing jet medium interactions via Z(H) + jet momentum imbalances

2020 ◽  
Vol 80 (12) ◽  
Author(s):  
Lin Chen ◽  
Shu-Yi Wei ◽  
Han-Zhong Zhang
Keyword(s):  
Transport Coefficient ◽  
Good Description ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
High Energy ◽  
Jet Quenching ◽  
Quenching Effect ◽  
Nuclear Collisions ◽  
Ion Collisions ◽  
Pqcd Approach

AbstractDifferent types of high energy hard probes are used to extract the jet transport properties of the Quark-Gluon Plasma created in heavy-ion collisions, of which the heavy boson tagged jets are undoubtedly the most sophisticated due to its clean decay signature and production mechanism. In this study, we used the resummation improved pQCD approach with high order correction in the hard factor to calculate the momentum ratio $$x_J$$ x J distributions of Z and Higgs (H) tagged jets. We found that the formalism can provide a good description of the 5.02 TeV pp data. Using the BDMPS energy loss formalism, along with the OSU 2 + 1D hydro to simulate the effect of the medium, we extracted the value of the jet transport coefficient to be around $${\hat{q}}_0=4\sim 8~\text {GeV}^2/\text {fm}$$ q ^ 0 = 4 ∼ 8 GeV 2 / fm by comparing with the Z + jet PbPb experimental data. The H + jet $$x_J$$ x J distribution were calculated in a similar manner in contrast and found to have a stronger Sudakov effect as compared with the Z + jet distribution. This study uses a clean color-neutral boson as trigger to study the jet quenching effect and serves as a complimentary method in the extraction of the QGP’s transport coefficient in high energy nuclear collisions.

Sign in / Sign up

Export Citation Format

Share Document