scholarly journals Wounded nucleon, quark, and quark-diquark emission functions versus experimental results from the BNL Relativistic Heavy Ion Collider at sNN=200 GeV

2019 ◽  
Vol 100 (6) ◽  
Author(s):  
Michał Barej ◽  
Adam Bzdak ◽  
Paweł Gutowski
Keyword(s):  
Heavy Ion ◽  
Experimental Results ◽  
Relativistic Heavy Ion Collider ◽  
200 Gev

scholarly journals Recent results from PHENIX at RHIC

2019 ◽  
Vol 204 ◽  
pp. 01017
Author(s):  
Victor Riabov
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Hadron Production ◽  
Large Datasets ◽  
Experimental Results ◽  
Relativistic Heavy Ion Collider ◽  
Direct Photons ◽  
Angular Correlations ◽  
Phenix Experiment ◽  
Ion Collisions

The PHENIX experiment at the relativistic heavy ion collider (RHIC) finished data taking in 2016. However, large datasets collected in different collision systems (p+p, p+A and A+A) at different energies (√sNN = 19-500 GeV) during the last years of the detector operation are actively analysed by the collaboration and bring a wealth of new experimental results. This paper reviews the most recent PHENIX results on the light flavour hadron production, yields and angular correlations of the direct photons in heavy-ion collisions as well as on the search for the onset of collectivity in high multiplicity p+p and p+A collisions.

scholarly journals Coherent diffractive photoproduction of ρ0 mesons on gold nuclei at 200 GeV/nucleon-pair at the Relativistic Heavy Ion Collider

2017 ◽  
Vol 96 (5) ◽  
Author(s):  
L. Adamczyk ◽  
J. K. Adkins ◽  
G. Agakishiev ◽  
M. M. Aggarwal ◽  
Z. Ahammed ◽  
...  
Keyword(s):  
Heavy Ion ◽  
Nucleon Pair ◽  
Relativistic Heavy Ion Collider ◽  
200 Gev

Physics of particle collisions at high energies: Limits to phenomenology, Part 1

2008 ◽  
Vol 86 (7) ◽  
pp. 883-897 ◽  
Author(s):  
G Sau ◽  
S K Biswas ◽  
B De ◽  
P Guptaroy ◽  
A Bhattacharya ◽  
...  
Keyword(s):  
Good Description ◽  
Heavy Ion ◽  
High Energy ◽  
Data Sets ◽  
Particle Interactions ◽  
Power Law Model ◽  
Particle Collisions ◽  
Relativistic Heavy Ion Collider ◽  
High Energies ◽  
200 Gev

Interpretation and understanding of high-energy PP data in a clear, consistent, and comprehensive manner is crucial for making valid claims to build up any successful theoretical framework for particle interactions. We have tried here to analyze the various sets of PP data available from the pre-ISR days to the latest PP collisions at the relativistic heavy ion collider (RHIC) experiment at [Formula: see text] = 200 GeV in the light of a power-law model. Both mid-rapidity and high-rapidity data sets have been dealt with by applying the same working formula. It is found that the working formula used provides a good description of these wide ranging data sets; but hardly throws any deep insights into the nature of particle interactions that force us to question the worth and rigour of phenomenological studies.PACS Nos.: 13.60.Hb, 13.60.Le, 13.85.Ni

scholarly journals Coherent e+e- production at very low transverse momentum at STAR

2018 ◽  
Vol 171 ◽  
pp. 18016 ◽  
Author(s):  
Chi Yang
Keyword(s):  
Theoretical Model ◽  
Transverse Momentum ◽  
Pair Production ◽  
Spectral Function ◽  
Model Calculation ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collider ◽  
200 Gev ◽  
Star Detector

We report the measurements of e+e- pair production at very low e+e- pair transverse momentum (pT < 0.15 GeV/c) in Au+Au collisions at [see formula in PDF] = 200 GeV and U+U collisions at [see formula in PDF] = 193 GeV using the STAR detector at the Relativistic Heavy Ion Collider. In 60-80% centrality, significant excesses are observed with respect to hadronic cocktails in both Au+Au and U+U collisions. These excess yields can not be explained by a theoretical model calculation incorporating in-medium broadened ρ spectral function. Additionally, the [see formula in PDF] distribution for excess yield is shown and found to be exponential at very low pT.

scholarly journals Selected Experimental Results from Heavy-Ion Collisions at LHC

2013 ◽  
Vol 2013 ◽  
pp. 1-22 ◽  
Author(s):  
Ranbir Singh ◽  
Lokesh Kumar ◽  
Pawan Kumar Netrakanti ◽  
Bedangadas Mohanty
Keyword(s):  
Heavy Ion Collisions ◽  
Hadron Collider ◽  
Heavy Ion ◽  
Azimuthal Anisotropy ◽  
Experimental Results ◽  
Particle Multiplicity ◽  
Charged Particle Multiplicity ◽  
Relativistic Heavy Ion Collider ◽  
Model Calculations ◽  
Ion Collisions

We review a subset of experimental results from the heavy-ion collisions at the Large Hadron Collider (LHC) facility at CERN. Excellent consistency is observed across all the experiments at the LHC (at center of mass energysNN=2.76 TeV) for the measurements such as charged particle multiplicity density, azimuthal anisotropy coefficients, and nuclear modification factor of charged hadrons. Comparison to similar measurements from the Relativistic Heavy Ion Collider (RHIC) at lower energy (sNN=200 GeV) suggests that the system formed at LHC has a higher energy density and larger system size and lives for a longer time. These measurements are compared to model calculations to obtain physical insights on the properties of matter created at the RHIC and LHC.

HEAVY ION THEORY: QCD AND MATTER IN EXTREMIS

2007 ◽  
Vol 22 (30) ◽  
pp. 5474-5480
Author(s):  
XIN-NIAN WANG
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Nuclear Matter ◽  
Dense Matter ◽  
Heavy Ion ◽  
High Energy ◽  
Experimental Results ◽  
Relativistic Heavy Ion Collider ◽  
Ion Collisions ◽  
Strongly Interacting

Nuclear matter is predicted to undergo a phase transition and become a plasma of quarks and gluons (QGP) at high temperature and density. Recent experimental results from high-energy heavy-ion collisions at the Relativistic Heavy-ion Collider (RHIC) indicate the production of a strongly interacting quark-gluon matter with fluid-like properties. I will discuss some expected features of QCD at high temperature and density, theoretical interpretations of experimental observations and challenges in unraveling some of the basic properties of dense matter in the strongly interacting regime.

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.

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