FIRST RESULTS FROM THE PHOBOS EXPERIMENT AT THE RHIC COLLIDER

2001 ◽  
Vol 16 (supp01c) ◽  
pp. 1265-1267
Author(s):  
◽  
JUDITH KATZY ◽  
B. B. Back ◽  
M. D. Baker ◽  
D. S. Barton ◽  
...  
Keyword(s):  
Center Of Mass ◽  
Charged Particles ◽  
Heavy Ion ◽  
Mass Energy ◽  
Relativistic Heavy Ion Collider ◽  
Center Of Mass Energy ◽  
Central Collisions ◽  
First Results ◽  
Pseudorapidity Density

PHOBOS is one of the four experiments at the Relativistic Heavy Ion Collider that started colliding gold nuclei at a center of mass energy of √sNN = 56 and 130 GeV per pair of colliding nucleons in June 2000. The pseudorapidity density of primary charged particles in central collisions has been measured near mid-rapidity.

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

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.

scholarly journals Transverse Momentum and Pseudorapidity Distributions of Charged Particles and Spatial Shapes of Interacting Events in Pb-Pb Collisions at 2.76 TeV

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Fu-Hu Liu ◽  
Ya-Qin Gao ◽  
Tian Tian ◽  
Bao-Chun Li
Keyword(s):  
Transverse Momentum ◽  
Thermal Model ◽  
Center Of Mass ◽  
Charged Particles ◽  
Nucleon Pair ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Rapidity Distributions ◽  
Pseudorapidity Distributions ◽  
Parameter Values

The transverse momentum and pseudorapidity distributions of charged particles produced in Pb-Pb collisions with different centrality intervals at center-of-mass energy per nucleon pairsNN=2.76 TeV have been analyzed by using the improved multisource thermal model in which the whole interacting system and then the sources are described by the Tsallis statistics. The modelling results are in agreement with experimental data of the ALICE Collaboration. The rapidity distributions of charged particles are obtained according to the extracted parameter values. The shapes of interacting events (the dispersion plots of charged particles) are given in the momentum, rapidity, velocity, and coordinate spaces. Meanwhile, the event shapes in different spaces consisted by different transverse quantities and longitudinal quantities are presented.

PSEUDORAPIDITY DISTRIBUTION OF CHARGED PARTICLES IN $p\bar p$ AND AA COLLISIONS AT HIGH ENERGIES

2005 ◽  
Vol 14 (04) ◽  
pp. 579-586
Author(s):  
FU SONG ◽  
FU-HU LIU
Keyword(s):  
Center Of Mass ◽  
Charged Particles ◽  
Pseudorapidity Distribution ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
High Energies ◽  
Cylinder Model ◽  
Energy Formula ◽  
Good Agreement ◽  
Aa Collisions

The pseudorapidity distributions of charged particles produced in [Formula: see text] annihilations and AA collisions at high energies are investigated by using a revised thermalized cylinder model. The Monte Carlo calculated results are compared and found to be in good agreement with the experimental data of [Formula: see text] annihilations at center-of-mass energy [Formula: see text], 546, 200, and 53 GeV, Au–Au collisions at [Formula: see text] and 130 A GeV, and Pb–Pb collisions at [Formula: see text].

Center of mass energy for charged particles in regular black holes

2014 ◽  
Vol 92 (6) ◽  
pp. 497-503 ◽  
Author(s):  
M. Sharif ◽  
Nida Haider
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Collision Energy ◽  
Center Of Mass ◽  
Charged Particles ◽  
Charge Ratio ◽  
Regular Space ◽  
Mass Energy ◽  
Regular Black Hole ◽  
Center Of Mass Energy

This paper is devoted to study the acceleration and collision of charged particles in a general regular space–time. Using angular momentum, energy, and components of four-velocity, we explore the effect of charged particles on the center of mass energy. It is found that the collision energy of charged particles (independent of both singularity as well as horizon) is greater than that of uncharged particles. This depends not only on the mass to charge ratio of the black hole but also on the charge of the particle. Finally, we evaluate the collision energy of charged particles for a regular black hole, a particular example.

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

2018 ◽  
Vol 171 ◽  
pp. 17002
Author(s):  
Redmer Alexander Bertens
Keyword(s):  
Initial Conditions ◽  
Center Of Mass ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Mass Energy ◽  
Initial State ◽  
Anisotropic Flow ◽  
Center Of Mass Energy ◽  
Ion Collisions ◽  
Hydrodynamic Calculations

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.

Center of mass energy of charged particles about Reissner–Nordström black hole

2021 ◽  
Author(s):  
Ayesha Zakria
Keyword(s):  
Black Hole ◽  
Center Of Mass ◽  
Charged Particles ◽  
Mass Energy ◽  
Outer Horizon ◽  
Center Of Mass Energy

We study the acceleration of charged particles by Reissner Nordström black hole by taking into account the term appearing in the formula of the center of mass energy due to charge of the particle. We consider that the particle is radially falling towards the black hole, i.e., [Formula: see text]. It is found that the center of mass energy is infinitely large at the outer horizon without any constraint.

scholarly journals Charged dilaton black hole in 2 + 1 dimensions as a particle accelerator

2017 ◽  
Vol 32 (16) ◽  
pp. 1750088 ◽  
Author(s):  
Sharmanthie Fernando
Keyword(s):  
Black Hole ◽  
Center Of Mass ◽  
Charged Particles ◽  
Low Energy ◽  
Particle Accelerator ◽  
Mass Energy ◽  
Particle Collisions ◽  
Critical Charge ◽  
Center Of Mass Energy ◽  
Dilaton Black Hole

In this paper, we have studied particle collisions around a charged dilaton black hole in 2 + 1 dimensions. This black hole is a solution to the low energy string action in 2 + 1 dimensions. Time-like geodesics for charged particles are studied in detail. The center-of-mass energy for two charged particles colliding closer to the horizon is calculated and shown to be infinite if one of the particles has the critical charge.

scholarly journals Gluon polarization measurements from longitudinally polarized proton-proton collisions at STAR

2020 ◽  
Vol 1643 (1) ◽  
pp. 012184
Author(s):  
Zilong Chang
Keyword(s):  
Spin Asymmetry ◽  
Center Of Mass ◽  
Heavy Ion ◽  
Proton Spin ◽  
Gluon Polarization ◽  
Relativistic Heavy Ion Collider ◽  
Center Of Mass Energy ◽  
Double Spin ◽  
200 Gev ◽  
Inclusive Jet

Abstract The gluon polarization contribution to the proton spin is an integral part to solve the longstanding proton spin puzzle. At the Relativistic Heavy Ion Collider (RHIC), the STAR experiment has measured jets produced in mid-pseudo-rapidity, |η| < 1.0, and full azimuth, ϕ, from longitudinally polarized pp collisions to study the gluon polarization in the proton. At center of mass energies s = 200 and 510 GeV, jet production is dominated by hard QCD scattering processes such as gluon-gluon (gg) and quark-gluon (qg), thus making the longitudinal double-spin asymmetry (ALL ) sensitive to the gluon polarization. Early STAR inclusive jet ALL results at s = 200 GeV provided the first evidence of the non-zero gluon polarization at momentum fraction x > 0.05. The higher center of mass energy s = 510 GeV allows to explore the gluon polarization as low as x ∼ 0.015. In this talk we will present the recent STAR inclusive jet and dijet ALL results at s = 510 GeV, and discuss the relevant new analysis techniques for the estimation of trigger bias and reconstruction uncertainty, the underlying event correction on the jet energy and its effect on jet ALL . Dijet results are shown for different topologies in regions of pseudo-rapidity, effectively scanning the x-dependence of the gluon polarization.

scholarly journals CENTRAL RAPIDITY DENSITIES OF CHARGED PARTICLES AT RHIC AND LHC

2000 ◽  
Vol 15 (14) ◽  
pp. 2019-2051 ◽  
Author(s):  
N. ARMESTO ◽  
C. PAJARES
Keyword(s):  
Large Hadron Collider ◽  
Hadron Collider ◽  
Charged Particles ◽  
Heavy Ion ◽  
Physical Basis ◽  
Relativistic Heavy Ion Collider ◽  
Central Collisions ◽  
Central Rapidity

Predictions on central rapidity densities of charged particles at energies of the relativistic heavy ion collider and the large hadron collider, for central collisions between the largest nuclei that will be available at these accelerators, are reviewed. Differences among the results of the existing models are discussed in relation with their underlying physical basis and with the possibilities to discriminate them.

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