MESON PRODUCTION AT SPS ENERGIES

2007 ◽  
Vol 22 (02n03) ◽  
pp. 659-662 ◽  
Author(s):  
ANDRZEJ RYBICKI
Keyword(s):  
Production Process ◽  
Comparative Studies ◽  
Initial Conditions ◽  
Meson Production ◽  
Heavy Ion ◽  
Coulomb Interactions ◽  
Final State ◽  
Ion Collisions ◽  
New Information ◽  
Particle Spectra

Comparative studies of hadron-induced interactions and heavy ion collisions have been performed at beam energies of 158 GeV/nucleon, corresponding to [Formula: see text]. They indicate that the heavy ion reaction is a mixture of various processes, including multiple nucleon collisions, isospin effects, and final state Coulomb interactions. The latter interactions result in surprising phenomena, like the presence of large and strongly varying structures in the shape of double-differential particle spectra. These phenomena depend on the initial conditions of the reaction and therefore can provide new information on the space and time evolution of the non-perturbative meson production process.

scholarly journals Correlations in the Initial Conditions of Heavy-Ion Collisions

2020 ◽  
Vol 235 ◽  
pp. 08002 ◽  
Author(s):  
Douglas Wertepny ◽  
Jacquelyn Noronha-Hostler ◽  
Matthew Sievert ◽  
Skandaprasad Rao ◽  
Noah Paladino
Keyword(s):  
Initial Conditions ◽  
Heavy Ion ◽  
Color Glass ◽  
Heavy Nuclei ◽  
Initial State ◽  
Final State ◽  
Microscopic Mechanism ◽  
Ion Collisions ◽  
The Impact ◽  
Initial Geometry

Ultracentral collisions of heavy nuclei, in which the impact parameter is nearly zero, are especially sensitive to the details of the initial state model and the microscopic mechanism for collective flow. In a hydrodynamic “flow” picture, the final state momentum correlations are a direct response to the fluctuating initial geometry, although models of the initial geometry differ widely. Alternatively, dynamical mechanisms based in the color glass condensate (CGC) formalism can naturally lead to many-body correlations with very different systematics. Here we present a calculation of event-by-event elliptic flow in both the hydrodynamic and CGC paradigms and show that they can be qualitatively distinguished in ultracentral collisions of deformed nuclei. Specifically, the multiplicity dependence in such collisions is qualitatively opposite, with the CGC correlations increasing with multiplicity while the hydrodynamic correlations decrease. The consistency of the latter with experimental data on UU collisions appears to rule out a CGC-mediated explanation. We find that these qualitative features also persist in small deformed systems and can therefore be a valuable test of the microscopic physics in that regime. The authors acknowledge support from the US-DOE Nuclear Science Grant No. DE-SC0019175, and the Alfred P. Sloan Foundation, and the Zuckerman STEM Leadership Program.

scholarly journals ωN final state interactions and ω-meson production from heavy-ion collisions

1999 ◽  
Vol 6 (1) ◽  
pp. 71-81 ◽  
Author(s):  
G.I. Lykasov ◽  
W. Cassing ◽  
A. Sibirtsev ◽  
M.V. Rzjanin
Keyword(s):  
Heavy Ion Collisions ◽  
Meson Production ◽  
Heavy Ion ◽  
Final State ◽  
Ion Collisions ◽  
Final State Interactions

scholarly journals Identifying QCD Transition Using Deep Learning

2018 ◽  
Vol 171 ◽  
pp. 16005 ◽  
Author(s):  
Kai Zhou ◽  
Long-gang Pang ◽  
Nan Su ◽  
Hannah Petersen ◽  
Horst Stoecker ◽  
...  
Keyword(s):  
Neural Network ◽  
Deep Learning ◽  
Equation Of State ◽  
Convolutional Neural Network ◽  
Phase Structure ◽  
Heavy Ion ◽  
Final State ◽  
Ion Collisions ◽  
Particle Spectra ◽  
Dynamical Information

In this proceeding we review our recent work using supervised learning with a deep convolutional neural network (CNN) to identify the QCD equation of state (EoS) employed in hydrodynamic modeling of heavy-ion collisions given only final-state particle spectra ρ(pT, Ф). We showed that there is a traceable encoder of the dynamical information from phase structure (EoS) that survives the evolution and exists in the final snapshot, which enables the trained CNN to act as an effective “EoS-meter” in detecting the nature of the QCD transition.

scholarly journals Electromagnetic effects on meson production: a new tool for studying the space-time evolution of heavy ion collisions

2016 ◽  
Vol 130 ◽  
pp. 05016 ◽  
Author(s):  
Andrzej Rybicki ◽  
Antoni Szczurek ◽  
Mariola Kłusek-Gawenda ◽  
Nikolaos Davis ◽  
Vitalii Ozvenchuk ◽  
...  
Keyword(s):  
Time Evolution ◽  
Heavy Ion Collisions ◽  
Meson Production ◽  
Heavy Ion ◽  
Space Time ◽  
Ion Collisions ◽  
Electromagnetic Effects ◽  
Space Time Evolution

scholarly journals Study of the influence of initial-state fluctuations on hydrodynamic simulations

2020 ◽  
Vol 245 ◽  
pp. 06005
Author(s):  
Marcin Słodkowski ◽  
Patryk Gawryszewski ◽  
Dominik Setniewski
Keyword(s):  
Initial Conditions ◽  
Graphics Processing Unit ◽  
Heavy Ion ◽  
Processing Unit ◽  
Initial State ◽  
Final State ◽  
Hydrodynamic Simulation ◽  
Hydrodynamic Simulations ◽  
Cartesian Coordinate ◽  
Ion Collision

In this work, we are focusing on assessing the contribution of the initial-state fluctuations of heavy ion collision in the hydrodynamic simulations. We are trying to answer the question of whether the hydrodynamic simulation retains the same level of fluctuation in the final-state as for the initial stage. In another scenario, the hydrodynamic simulations of the fluctuation drowns in the final distribution of expanding matter. For this purpose, we prepared sufficient relativistic hydrodynamic program to study A+A interaction which allows analysing initial-state fluctuations in the bulk nuclear matter. For such an assumption, it is better to use high spatial resolution. Therefore, we applied the (3+1) dimensional Cartesian coordinate system. We implemented our program using parallel computing on graphics cards processors - Graphics Processing Unit (GPU). Simulations were carried out with various levels of fluctuation in initial conditions using the average method of events coming from UrQMD models. Energy density distributions were analysed and the contribution of fluctuations in initial conditions was assessed in the hydrodynamic simulation.

Sign in / Sign up

Export Citation Format

Share Document