scholarly journals The ϕ meson production in small collision systems observed by PHENIX

2022 ◽  
Vol 258 ◽  
pp. 05010
Author(s):  
Mariia Mitrankova ◽  
Alexander Berdnikov ◽  
Yaroslav Berdnikov ◽  
Dmitry Kotov ◽  
Iurii Mitrankov
Keyword(s):  
Collective Behavior ◽  
Quark Gluon Plasma ◽  
Meson Production ◽  
Theoretical Models ◽  
Gluon Plasma ◽  
Hadron Production ◽  
Enhancement Effect ◽  
Light Hadron ◽  
200 Gev ◽  
Strangeness Enhancement

The measurements of light hadron production in small collision systems (such as p+Al, p+Au, d+Au, 3He+Au) may allow to explore the quarkgluon plasma formation and to determine the main hadronization mechanism in the considered collisions. Such research has become particularly crucial with the observation of the light hadrons collective behavior in p/d/3He+Au collisions at √SNN = 200 GeV and in p+Al collisions at the same energy at forward and backward rapidities. Among the large variety of light hadrons, ϕ meson is of particular interest since its production is sensitive to the presence of the quark-gluon plasma. The paper presents the comparison of the obtained experimental results on ϕ meson production to different light hadron production in p+Al and 3He+Au at √SNN = 200 GeV at midrapidity. The comparisons of ϕ meson production in p+Al, p+Au, d+Au, and 3He+Au collisions at √SNN = 200 GeV at midrapidity to theoretical models predictions (PYTHIA model and default and string melting versions of the AMPT model) are also provided. The results suggest that the QGP can be formed in p/d/3He+Au collisions, but the volume and lifetime of the produced medium might be insufficient for observation of strangeness enhancement effect. Conceivably, the main hadronization mechanism of ϕ meson production in p+Al collisions is fragmentation, while in p/d/3He+Au collisions this process occurs via coalescence.

scholarly journals News from the strong interactions program of NA61/SHINE

2022 ◽  
Vol 258 ◽  
pp. 05007
Author(s):  
Wojciech Bryliński ◽  
Keyword(s):  
Quark Gluon Plasma ◽  
Theoretical Models ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Hadron Production ◽  
Beam Momentum ◽  
Strong Interactions ◽  
Neutrino Experiment ◽  
Net Charge ◽  
Wide Range

NA61/SHINE (SPS Heavy Ion and Neutrino Experiment) is a fixedtarget experiment operating at the CERN SPS accelerator. The main goal of the strong interactions program of NA61/SHINE is to study the properties of the phase transition between confined matter and quark-gluon plasma by performing a two-dimensional scan in beam momentum and size of collided nuclei. Within this program, collisions of different systems (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La, Pb+Pb) over a wide range of beam momenta (13A-150(8)A GeV/c) have been recorded. This contribution discusses the latest results of hadron production in p+p, Be+Be, Ar+Sc and Pb+Pb reactions measured by the NA61/SHINE. In particular, the results include charged kaons and pions spectra and higher-order moments of multiplicity and net charge distributions. The presented data are compared with the predictions of different theoretical models as well as the results from other experiments. Finally, the motivation and plans for future NA61/SHINE measurements are discussed.

scholarly journals Model calculations of φ-meson production in small collision systems

2021 ◽  
Vol 2103 (1) ◽  
pp. 012135
Author(s):  
M M Mitrankova ◽  
A Ya Berdnikov ◽  
Ya A Berdnikov ◽  
D O Kotov ◽  
Iu M Mitrankov
Keyword(s):  
Quark Gluon Plasma ◽  
Meson Production ◽  
Theoretical Models ◽  
Gluon Plasma ◽  
Big Bang ◽  
Baryon Density ◽  
Plasma Formation ◽  
Collective Effects ◽  
Collision Dynamics ◽  
Model Calculations

Abstract Ultrarelativistic ion collisions provide the unique possibility to study the quark-gluon plasma, a state of matter formed in the universe at the very first moments after the Big Bang. The minimal temperature and baryon density for the quark-gluon plasma formation requires scrutiny, since the signatures of the quark-gluon plasma formation are observed in large systems (such as Au+Au) at s N N = 200 GeV , whereas collective effects in p+p collisions are not revealed. The φ-meson production measurements are considered to be a convenient tool to investigate the collision dynamics, as it is sensitive to the quark-gluon plasma effects. To interpret the nuclear modification effects and to study the process of the possible QGP formation the comparison with different theoretical models predictions is needed. This paper presents the comparison of the obtained experimental results on φ-meson production in small collision systems (p+Al, p+Au) at s N N = 200 GeV to default and string melting versions of the AMPT model and PYTHIA model predictions. The results indicate that the minimal conditions (temperature and baryon density) for a QGP formation may lie in between in p+Al and p+Au collisions.

scholarly journals Small Collision Systems at RHIC

2018 ◽  
Vol 171 ◽  
pp. 11002
Author(s):  
Norbert Novitzky
Keyword(s):  
Long Range ◽  
Collective Behavior ◽  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Small Systems ◽  
Long Range Correlations ◽  
200 Gev ◽  
Open Question

The observation of long range correlations in highly asymmetric systems, as in p+Pb and d+Au collisions, suggests a creation of a medium with collective behavior. It is still an open question if the quark-gluon plasma is formed in these collision. Hence, the RHIC collider invested time to study the small systems in different collision systems and energies. Here we discuss the recent results from the PHENIX and STAR collaborations in four different collision systems p+Al, p+Au, d+Au and 3He+Au at [see formula in PDF] = 200 GeV, and also for the energy scan in d+Au collisions between [see formula in PDF] = 19.6 – 200 GeV.

scholarly journals Flow and correlation phenomena measurements in pp, pPb and PbPb collisions at CMS

2018 ◽  
Vol 172 ◽  
pp. 05005
Author(s):  
Sandra S. Padula
Keyword(s):  
Transverse Momentum ◽  
Collective Behavior ◽  
Quark Gluon Plasma ◽  
Frictional Resistance ◽  
Gluon Plasma ◽  
High Energy ◽  
Collective Flow ◽  
Particle Correlation ◽  
The Past ◽  
High Energy Collisions

The quark-gluon plasma created in high energy collisions of large nuclei exhibits strong anisotropic collective behavior as a nearly perfect fluid, flowing with little frictional resistance or viscosity. It has been investigated extensively over the past years employing two or more particle correlations. An overview of collective flow and particle correlation measurements at CMS as a function of transverse momentum, pseudorapidity, event multiplicity, for both charged hadrons or identified particles will be presented. These results are compared among pp, pPb and PbPb systems and several aspects of their intriguing similarities are discussed.

scholarly journals Hadron production and quark-gluon plasma hadronization in Pb-Pb collisions atsNN=2.76 TeV

2013 ◽  
Vol 88 (3) ◽  
Author(s):  
Michal Petráň ◽  
Jean Letessier ◽  
Vojtěch Petráček ◽  
Johann Rafelski
Keyword(s):  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Hadron Production

scholarly journals Hadron production from a hadronizing quark - gluon plasma

1997 ◽  
Vol 23 (12) ◽  
pp. 2047-2050 ◽  
Author(s):  
Christian Spieles ◽  
Horst Stöcker ◽  
Carsten Greiner
Keyword(s):  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Hadron Production

scholarly journals OBSERVING QUARK-GLUON PLASMA WITH STRANGE HADRONS

2000 ◽  
Vol 09 (02) ◽  
pp. 107-147 ◽  
Author(s):  
JEAN LETESSIER ◽  
JOHANN RAFELSKI
Keyword(s):  
Quark Gluon Plasma ◽  
Beam Energy ◽  
Particle Production ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Hadron Production ◽  
Dynamical Theory ◽  
Heavy Ion Collision ◽  
Strange Hadron ◽  
Ion Collision

We review the methods and results obtained in an analysis of the experimental heavy ion collision research program at nuclear beam energy of 160–200 A GeV. We study strange, and more generally, hadronic particle production experimental data. We discuss present expectations concerning how these observables will perform at other collision energies. We also present the dynamical theory of strangeness production and apply it to show that it agrees with available experimental results. We describe strange hadron production from the baryon-poor quark-gluon phase formed at much higher reaction energies, where the abundance of strange baryons and antibaryons exceeds that of nonstrange baryons and antibaryons.

scholarly journals Study of Azimuthal Anisotropy of High-pT Charged Particles in Au Au Collisions at √sNN = 200 GeV with RHIC-PHENIX

Proceedings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 42
Author(s):  
Risa Nishitani
Keyword(s):  
Energy Loss ◽  
Quark Gluon Plasma ◽  
Path Length ◽  
Gluon Plasma ◽  
Azimuthal Anisotropy ◽  
Anisotropy Coefficient ◽  
Phenix Experiment ◽  
Out Of Plane ◽  
200 Gev ◽  
The Difference

We study the path length dependence of energy-loss in the Quark Gluon Plasma (QGP) by measuring the azimuthal anisotropy coefficient and transverse momentum ( p T ) spectra for charged hadrons in Au + Au at s N N = 200 GeV at the RHIC-PHENIX experiment. To estimate the strength of the energy-loss as a function of p T , we use the Δ p T which is the difference of p T which provide the same yields at in-plane and out-of-plane directions. The results indicate that there are different structures between low- p T and high- p T regions. At high- p T , the size of Δ p T increases as the centrality goes up. We also calculate the difference of the path length of in-plane and out-of-plane directions for each centrality. The difference of the path length increases along with the centrality and the tendency is the same with the Δ p T results.

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