PARTON RECOMBINATION IN CLASSICAL CASCADE

1990 ◽  
Vol 05 (28) ◽  
pp. 2377-2383 ◽  
Author(s):  
A. V. BATUNIN ◽  
O. P. YUSHCHENKO
Keyword(s):  
Explicit Form ◽  
Heavy Ion Collisions ◽  
Charged Particles ◽  
Heavy Ion ◽  
Considerable Decrease ◽  
High Energies ◽  
Ion Collisions ◽  
Parton Cascade ◽  
Energy Formula ◽  
The Mean

An equation for parton multiplicity in cascade with the recombination 1 → 2 ⊕ 2 → 1 is derived from a Kolmogorov-Chapman equation and solved. An evolution parameter τ of the cascade depends on the c.m. energy [Formula: see text]; an explicit form of the dependence is obtained from the condition that the mean multiplicity of charged particles in pp, [Formula: see text] collisions be reproduced. A considerable decrease in the mean multiplicity in heavy-ion collisions per pair of the colliding nucleons at high energies is predicted and compared to the parton cascade with no recombination.

scholarly journals PRODUCTION OF LIGHT ANTINUCLEI IN HEAVY-ION COLLISIONS

2004 ◽  
Vol 13 (06) ◽  
pp. 1157-1177 ◽  
Author(s):  
B. L. IOFFE ◽  
I. A. SHUSHPANOV ◽  
K. N. ZYABLYUK
Keyword(s):  
Heavy Ion Collisions ◽  
Mean Field ◽  
Heavy Ion ◽  
High Energy ◽  
Production Rates ◽  
High Energies ◽  
Ion Collisions ◽  
Explicit Formulae ◽  
The Mean

The antideuteron and antihelium-3 production rates in high-energy heavy-ion collisions are calculated in the framework of fusion mechanism. It is supposed that [Formula: see text] participating in the fusion are moving in the mean field of other fireball constituents. It is demonstrated that at high energies, where many pions are present in the fireball, the number of produced [Formula: see text] and [Formula: see text] is determined by the balance between created and disintegrated (mainly in collisions with pions) [Formula: see text] and [Formula: see text]. The explicit formulae for coalescence parameters are presented and compared with the data.

Pseudorapidity distribution of relativistic singly charged particles in heavy-ion collisions at high energy

1999 ◽  
Vol 77 (4) ◽  
pp. 313-318 ◽  
Author(s):  
F -H Liu ◽  
Y A Panebratsev
Keyword(s):  
Experimental Data ◽  
Heavy Ion Collisions ◽  
Charged Particles ◽  
Heavy Ion ◽  
High Energy ◽  
Pseudorapidity Distribution ◽  
Ion Collisions ◽  
Singly Charged

The pseudorapidity distribution of relativistic singly charged particles produced in high-energy heavy-ion collisions is described by the thermalized cylinder picture. The calculated results are in agreement with the experimental data of lead-induced interactions at 158A GeV/c. PACS Nos.:25.75.-q and 25.75.Dw

scholarly journals Polarization in relativistic heavy ion collisions: a theoretical perspective

2018 ◽  
Vol 171 ◽  
pp. 07001 ◽  
Author(s):  
Francesco Becattini
Keyword(s):  
Heavy Ion Collisions ◽  
Theoretical Perspective ◽  
Heavy Ion ◽  
Hydrodynamical Model ◽  
Relativistic Heavy Ion Collisions ◽  
Spin Vector ◽  
Ion Collisions ◽  
The Mean ◽  
Theoretical Issues ◽  
Covariant Decomposition

We review the theoretical framework for the calculation of particle polarization in relativistic heavy ion collisions within the hydrodynamical model. The covariant decomposition of the mean spin vector is presented and open theoretical issues addressed.

scholarly journals A Description of Pseudorapidity Distributions of Charged Particles Produced in Au+Au Collisions at RHIC Energies

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Z. J. Jiang ◽  
Dongfang Xu ◽  
Yan Huang
Keyword(s):  
Phase Transition ◽  
Heavy Ion Collisions ◽  
Charged Particles ◽  
Dense Matter ◽  
Heavy Ion ◽  
High Energy ◽  
Low Energy ◽  
Ion Collisions ◽  
Rapidity Distributions ◽  
Pseudorapidity Distributions

In heavy ion collisions, charged particles come from two parts: the hot and dense matter and the leading particles. In this paper, the hot and dense matter is assumed to expand according to the hydrodynamic model including phase transition and decouples into particles via the prescription of Cooper-Frye. The leading particles are as usual supposed to have Gaussian rapidity distributions with the number equaling that of participants. The investigations of this paper show that, unlike low energy situations, the leading particles are essential in describing the pseudorapidity distributions of charged particles produced in high energy heavy ion collisions. This might be due to the different transparencies of nuclei at different energies.

scholarly journals Centrality, transverse momentum and collision energy dependence of the Tsallis parameters in relativistic heavy-ion collisions

2021 ◽  
Vol 136 (6) ◽  
Author(s):  
Rajendra Nath Patra ◽  
Bedangadas Mohanty ◽  
Tapan K. Nayak
Keyword(s):  
Transverse Momentum ◽  
Heavy Ion Collisions ◽  
Collision Energy ◽  
Charged Particles ◽  
Heavy Ion ◽  
High Energy ◽  
Relativistic Heavy Ion Collisions ◽  
Central Collisions ◽  
Ion Collisions ◽  
Tsallis Distribution

AbstractThe thermodynamic properties of matter created in high-energy heavy-ion collisions have been studied in the framework of the non-extensive Tsallis statistics. The transverse momentum ($$p_\mathrm{T}$$ p T ) spectra of identified charged particles (pions, kaons, protons) and all charged particles from the available experimental data of Au-Au collisions at the Relativistic Heavy Ion Collider (RHIC) energies and Pb-Pb collisions at the Large Hadron Collider (LHC) energies are fitted by the Tsallis distribution. The fit parameters, q and T, measure the degree of deviation from an equilibrium state and the effective temperature of the thermalized system, respectively. The $$p_\mathrm{T}$$ p T  spectra are well described by the Tsallis distribution function from peripheral to central collisions for the wide range of collision energies, from $$\sqrt{s_\mathrm{NN}}$$ s NN = 7.7 GeV to 5.02 TeV. The extracted Tsallis parameters are found to be dependent on the particle species, collision energy, centrality, and fitting ranges in $$p_\mathrm{T}$$ p T . For central collisions, both q and T depend strongly on the fit ranges in $$p_\mathrm{T}$$ p T . For most of the collision energies, q remains almost constant as a function of centrality, whereas T increases from peripheral to central collisions. For a given centrality, q systematically increases as a function of collision energy, whereas T has a decreasing trend. A profile plot of q and T with respect to collision energy and centrality shows an anti-correlation between the two parameters.

scholarly journals The mean transverse momentum of ultracentral heavy-ion collisions: A new probe of hydrodynamics

2020 ◽  
Vol 809 ◽  
pp. 135749
Author(s):  
Fernando G. Gardim ◽  
Giuliano Giacalone ◽  
Jean-Yves Ollitrault
Keyword(s):  
Transverse Momentum ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Ion Collisions ◽  
The Mean

COLLECTIVE AZIMUTHAL ALIGNMENT IN RELATIVISTIC HEAVY ION REACTIONS

1987 ◽  
Vol 02 (03) ◽  
pp. 163-168 ◽  
Author(s):  
P. BECKMANN ◽  
H.A. GUSTAFSSON ◽  
H.H. GUTBROD ◽  
K.H. KAMPERT ◽  
B. KOLB ◽  
...  
Keyword(s):  
Energy Dependence ◽  
Heavy Ion Collisions ◽  
Center Of Mass ◽  
Charged Particles ◽  
Heavy Ion ◽  
Heavy Ion Reactions ◽  
Ion Collisions ◽  
Forward Hemisphere

The collective azimuthal alignment of charged particles is observed inside of two groups of particles, one emitted to the backward and one emitted to the forward hemisphere in the center of mass of symmetric heavy ion collisions. Whereas for Ca+Ca collisions no effect is observed, the alignment is present for Nb+Nb, and is even more pronounced for Au+Au. There exists also a distinct multiplicity and energy dependence of this collective azimuthal alignment.

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