SYSTEM SIZE AND ENERGY DEPENDENCE OF HIGH pT HADRON PRODUCTION MEASURED WITH PHENIX EXPERIMENT AT RHIC

PHENIX has measured high transverse momentum (pT) identified hadrons in different collision species and energies in the last five RHIC runs. The systematic study of the high PT hadron production provides an idea on interaction of hard scattered partons and the matter created in relativistic heavy ion collision. The η/π0 ratio is measured in Au + Au collisions, which gives a hint on the system thermalization and particle production. A future measurement of hadron and photon measurement is discussed.

Download Full-text

OBSERVING QUARK-GLUON PLASMA WITH STRANGE HADRONS

International Journal of Modern Physics E ◽

10.1142/s0218301300000076 ◽

2000 ◽

Vol 09 (02) ◽

pp. 107-147 ◽

Cited By ~ 29

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.

Download Full-text

Two-particle correlations on transverse momentum: an untapped resource for studying relativistic heavy-ion collision dynamics

EPJ Web of Conferences ◽

10.1051/epjconf/202023501003 ◽

2020 ◽

Vol 235 ◽

pp. 01003

Author(s):

Robert L. Ray ◽

Alexander M. Jentsch

Keyword(s):

Transverse Momentum ◽

Heavy Ion ◽

Heavy Ion Collision ◽

Collision Dynamics ◽

Particle Correlation ◽

Angular Correlations ◽

Relativistic Heavy Ion Collision ◽

Theoretical Predictions ◽

Ion Collision ◽

Untapped Resource

Two-particle correlation projections onto two-dimensional transverse momentum coordinates (pt1, pt2) allow access to properties of the relativistic heavy-ion collision system which are complementary to that studied using angular correlations. Examples include the degree of thermal equilibration and the variance of dynamical fluctuations in hard-scattering processes. Results for minimum-bias Au + Au collisions at √sNN = 200 are presented, with the structures described by two phenomenological models. The correlations structures and extracted physical quantities are then compared to theoretical predictions. Conclusions from these comparisons regarding global equilibration, fluctuations in soft and semi-hard QCD processes, and the effects of the hot, dense collision medium are presented.

Download Full-text

Complex potential and bottomonium suppression at LHC energy

International Journal of Modern Physics A ◽

10.1142/s0217751x15500438 ◽

2015 ◽

Vol 30 (09) ◽

pp. 1550043 ◽

Cited By ~ 7

Author(s):

Uttam Kakade ◽

Binoy Krishna Patra ◽

Lata Thakur

Keyword(s):

Transverse Momentum ◽

Density Ratio ◽

Heavy Ion ◽

Entropy Density ◽

Heavy Ion Collision ◽

Relativistic Heavy Ion Collision ◽

Quark Potential ◽

Heavy Quark Potential ◽

Ion Collision ◽

Perturbative Result

We have studied the thermal suppression of the bottomonium states in relativistic heavy-ion collision at LHC energies as function of centrality, rapidity, transverse momentum. First, we address the effects of the nonperturbative confining force and the momentum anisotropy together on heavy quark potential at finite temperature, which are resolved by correcting both the perturbative and nonperturbative terms of the potential at T = 0 in a weakly-anisotropic medium, not its perturbative term alone as usually done in the literature. Second, we model the expansion of medium by the Bjorken hydrodynamics in the presence of both shear and bulk viscosity, followed by an additional pre-equilibrium anisotropic evolution. Finally, we couple them together to quantify the yields of bottomonium production in nucleus–nucleus collisions at LHC energies and found a better agreement with the CMS data. Our estimate of the inclusive ϒ(1S) production indirectly constrains both the uncertainties in isotropization time and the shear-to-entropy density ratio and favors the values as 0.3 fm/c and 0.3 (perturbative result), respectively.

Download Full-text