Anisotropic flow of identified particles in Pb–Pb collisions at √SNN = 5.02 TeV

Anisotropic flow is sensitive to the shear (η/s) and bulk (ζ/s) viscosity of the quark-gluon plasma created in heavy-ion collisions, as well as the initial state of such collisions and hadronization mechanisms. In these proceedings, elliptic (υ2) and higher harmonic (υ3, υ4) flow coefficients of π±, K±, p(p) and the ϕ-meson, are presented for Pb—Pb collisions at the highest-ever center-of-mass energy of [see formula in PDF] = 5.02 TeV. Comparisons to hydrodynamic calculations (IP-Glasma, MUSIC, UrQMD) are shown to constrain the initial conditions and viscosity of the medium.

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HYDJET SIMULATIONS OF ELLIPTIC FLOW IN HEAVY ION COLLISIONS AT THE LHC

International Journal of Modern Physics E ◽

10.1142/s0218301307007246 ◽

2007 ◽

Vol 16 (07n08) ◽

pp. 1917-1922

Author(s):

D. KROFCHECK ◽

R. MAK ◽

P. ALLFREY

Keyword(s):

Hadron Collider ◽

Center Of Mass ◽

Elliptic Flow ◽

Heavy Ion ◽

Event Generator ◽

Simulation Tool ◽

Mass Energy ◽

Relativistic Heavy Ion Collider ◽

Center Of Mass Energy ◽

Ion Collisions

At the Relativistic Heavy Ion Collider (RHIC) elliptic flow signals (v2) appear to be stronger than those measured at lower center-of-mass energies. With the beginning of heavy ion beams at the Large Hadron Collider (LHC) it is important to have a reliable tool for simulating v2 at the LHC Pb – Pb center-of-mass energy of 5.5 A TeV. In this work we used the heavy ion simulation tool HYDJET to study elliptic flow at the event generator level. The generator level elliptic flow v2 for Pb – Pb collisions was two-particle and four-particle cumulants.

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Exploring Baryon Rich Matter with Heavy-Ion Collisions

Ukrainian Journal of Physics ◽

10.15407/ujpe64.7.583 ◽

2019 ◽

Vol 64 (7) ◽

pp. 583 ◽

Cited By ~ 1

Author(s):

S. Harabasz

Keyword(s):

Center Of Mass ◽

Heavy Ion ◽

State Density ◽

Heavy Nuclei ◽

First Order ◽

Center Of Mass Energy ◽

Ion Collisions ◽

Deconfinement Phase Transition ◽

Ground State Density

Collisions of heavy nuclei at (ultra-)relativistic energies provide a fascinating opportunity to re-create various forms of matter in the laboratory. For a short extent of time (10-22 s), matter under extreme conditions of temperature and density can exist. In dedicated experiments, one explores the microscopic structure of strongly interacting matter and its phase diagram. In heavy-ion reactions at SIS18 collision energies, matter is substantially compressed (2–3 times ground-state density), while moderate temperatures are reached (T < 70 MeV). The conditions closely resemble those that prevail, e.g., in neutron star mergers. Matter under such conditions is currently being studied at the High Acceptance DiElecton Spectrometer (HADES). Important topics of the research program are the mechanisms of strangeness production, the emissivity of matter, and the role of baryonic resonances herein. In this contribution, we will focus on the important experimental results obtained by HADES in Au+Au collisions at 2.4 GeV center-of-mass energy. We will also present perspectives for future experiments with HADES and CBM at SIS100, where higher beam energies and intensities will allow for the studies of the first-order deconfinement phase transition and its critical endpoint.

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INTERMITTENCY PATTERNS IN PROTON-NUCLEUS INTERACTIONS AT HIGH ENERGY

Modern Physics Letters A ◽

10.1142/s0217732393003998 ◽

1993 ◽

Vol 08 (40) ◽

pp. 3853-3859 ◽

Cited By ~ 3

Author(s):

D. K. MAITY ◽

P. K. BANERJEE ◽

B. B. DAS ◽

D. RAVINDRAN ◽

D. K. BHATTACHARJEE

Keyword(s):

Power Law ◽

Quark Gluon Plasma ◽

Center Of Mass ◽

Gluon Plasma ◽

High Energy ◽

Mass Energy ◽

Factorial Moments ◽

Center Of Mass Energy

A study of intermittency in hadron-nucleus and the comparison with nucleus-nucleus interactions is presented. The power law behavior of the factorial moments and the variation of intermittency index with the center-of-mass energy are shown. Results favor the formation of quark-gluon plasma in preference to a cascade mechanism.

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Hadron Spectra Parameters within the Non-Extensive Approach

Universe ◽

10.3390/universe5050122 ◽

2019 ◽

Vol 5 (5) ◽

pp. 122 ◽

Cited By ~ 6

Author(s):

Keming Shen ◽

Gergely Gábor Barnaföldi ◽

Tamás Sándor Biró

Keyword(s):

High Energy Physics ◽

Center Of Mass ◽

Heavy Ion ◽

High Energy ◽

Proton Proton ◽

Center Of Mass Energy ◽

Ion Collisions ◽

Hadron Spectra ◽

Hadron Mass ◽

Energy Scaling

We investigate how the non-extensive approach works in high-energy physics. Transverse momentum ( p T ) spectra of several hadrons are fitted by various non-extensive momentum distributions and by the Boltzmann–Gibbs statistics. It is shown that some non-extensive distributions can be transferred one into another. We find explicit hadron mass and center-of-mass energy scaling both in the temperature and in the non-extensive parameter, q, in proton–proton and heavy-ion collisions. We find that the temperature depends linearly, but the Tsallis q follows a logarithmic dependence on the collision energy in proton–proton collisions. In the nucleus–nucleus collisions, on the other hand, T and q correlate linearly, as was predicted in our previous work.

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JET RESULTS AND JET RECONSTRUCTION TECHNIQUES IN p+p AND THEIR PROSPECTS IN HEAVY-ION COLLISIONS IN ATLAS

International Journal of Modern Physics E ◽

10.1142/s0218301311019842 ◽

2011 ◽

Vol 20 (07) ◽

pp. 1545-1550

Author(s):

◽

MARTIN SPOUSTA

Keyword(s):

Cross Sections ◽

Heavy Ion Collisions ◽

Center Of Mass ◽

Heavy Ion ◽

Proton Proton ◽

Center Of Mass Energy ◽

Ion Collisions ◽

Expected Performance ◽

Jet Shapes ◽

Jet Cross Sections

We present the measurement of jet production performed with the ATLAS detector in proton-proton collisions at center-of-mass energy of 7 TeV, using an integrated luminosity of 17 nb−1. We show the inclusive jet cross sections and jet shapes. The expected performance and strategy for the jet reconstruction in heavy ion collisions is also discussed.

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Correlations in the Initial Conditions of Heavy-Ion Collisions

EPJ Web of Conferences ◽

10.1051/epjconf/202023508002 ◽

2020 ◽

Vol 235 ◽

pp. 08002 ◽

Cited By ~ 1

Author(s):

Douglas Wertepny ◽

Jacquelyn Noronha-Hostler ◽

Matthew Sievert ◽

Skandaprasad Rao ◽

Noah Paladino

Keyword(s):

Initial Conditions ◽

Heavy Ion ◽

Color Glass ◽

Heavy Nuclei ◽

Initial State ◽

Final State ◽

Microscopic Mechanism ◽

Ion Collisions ◽

The Impact ◽

Initial Geometry

Ultracentral collisions of heavy nuclei, in which the impact parameter is nearly zero, are especially sensitive to the details of the initial state model and the microscopic mechanism for collective flow. In a hydrodynamic “flow” picture, the final state momentum correlations are a direct response to the fluctuating initial geometry, although models of the initial geometry differ widely. Alternatively, dynamical mechanisms based in the color glass condensate (CGC) formalism can naturally lead to many-body correlations with very different systematics. Here we present a calculation of event-by-event elliptic flow in both the hydrodynamic and CGC paradigms and show that they can be qualitatively distinguished in ultracentral collisions of deformed nuclei. Specifically, the multiplicity dependence in such collisions is qualitatively opposite, with the CGC correlations increasing with multiplicity while the hydrodynamic correlations decrease. The consistency of the latter with experimental data on UU collisions appears to rule out a CGC-mediated explanation. We find that these qualitative features also persist in small deformed systems and can therefore be a valuable test of the microscopic physics in that regime. The authors acknowledge support from the US-DOE Nuclear Science Grant No. DE-SC0019175, and the Alfred P. Sloan Foundation, and the Zuckerman STEM Leadership Program.

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Anisotropic flow and jet quenching in relativistic nuclear collisions

International Journal of Modern Physics E ◽

10.1142/s0218301315300015 ◽

2015 ◽

Vol 24 (02) ◽

pp. 1530001 ◽

Cited By ~ 3

Author(s):

Guang-You Qin

Keyword(s):

Dense Matter ◽

Heavy Ion ◽

Gluon Plasma ◽

High Energy ◽

Jet Quenching ◽

Relativistic Heavy Ion Collisions ◽

Anisotropic Flow ◽

Nuclear Collisions ◽

Ion Collisions ◽

Relativistic Nuclear Collisions

The exploration of the strong-interaction matter under extreme conditions is one of the main goals of relativistic heavy-ion collisions. We provide some of the main results on the novel properties of quark-gluon plasma, with particular focus given to the strong collectivity and the color opaqueness exhibited by such hot and dense matter produced in high-energy nuclear collisions at RHIC and the LHC.

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Charge-changing ion–ion collisions in heavy ion fusion

Laser and Particle Beams ◽

10.1017/s0263034602203262 ◽

2002 ◽

Vol 20 (3) ◽

pp. 493-495 ◽

Cited By ~ 1

Author(s):

H. BRÄUNING ◽

A. DIEHL ◽

K.v. DIEMAR ◽

A. THEIß ◽

R. TRASSL ◽

...

Keyword(s):

Charge Transfer ◽

Cross Sections ◽

Center Of Mass ◽

Heavy Ion ◽

Center Of Mass Energy ◽

Ion Collisions ◽

Intrabeam Scattering ◽

Singly Charged ◽

Heavy Ion Fusion ◽

And Storage

In heavy ion fusion, the compression of the DT pellet requires high intensity beams of ions in the gigaelectron volt energy range. Charge-changing collisions due to intrabeam scattering can have a high impact on the design of adequate accelerator and storage rings. Not only do intensity losses have to be taken into account, but also the deposition of energy on the beam lines after bending magnets, for example, may be nonnegligible. The center-of-mass energy for these intrabeam collisions is typically in the kiloelectron volt range for beam energies in the order of several gigaelectron volts. In this article, we present experimental cross sections for charge transfer and ionization in homonuclear collisions of Ar4+, Kr4+, and Xe4+, and for charge transfer only in homonuclear collisions of Pb4+ and Bi4+. Using a hypothetical 100-Tm synchrotron as an example, expected particle losses are calculated based on the experimental data. The results are compared with expectations for singly charged Bi+ ions, which are usually considered for heavy ion fusion.

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