scholarly journals Determination of geometry of heavy ion collisions with forward hadron calorimeter (FHCal) at MPD/NICA

2019 ◽  
Vol 204 ◽  
pp. 07002 ◽  
Author(s):  
Alexander Ivashkin ◽  
Dmitry Finogeev ◽  
Marina Golubeva ◽  
Fedor Guber ◽  
Alexander Izvestnyy ◽  
...  
Keyword(s):  
Energy Deposition ◽  
Heavy Ion ◽  
Reaction Plane ◽  
Heavy Ion Collision ◽  
Collision Point ◽  
Ion Collisions ◽  
Peripheral Collisions ◽  
Ion Collision ◽  
Energy Asymmetry

The main purpose of the FHCal is to provide an experimental measurement of a heavy-ion collision centrality (impact parameter) and orientation of its reaction plane. FHCal consists of two identical arms placed at the left/right sides from the beam collision point. Due to the fine modular structure and detection of spectators in both forward/backward regions, the angular resolution of the reaction plane reconstruction is below 30 degrees. Since the heavy fragments escape into beam holes, it is not possible to distinguish the central and peripheral collisions using only the deposited energies in FHCal. The subdivision of the calorimeter into two, inner and outer parts, and the calculation of the energy depositions separately in these calorimeter parts allow one to construct a new observable, the energy asymmetry. Taking the two-dimensional correlation between the energy asymmetry and full energy deposition in the calorimeter, it would be possible to resolve the ambiguity in the centrality determination.

Study and Investigation of Hard Photons Emission in Heavy Ion Collisions

2021 ◽  
Vol 19 (2) ◽  
pp. 61-65
Author(s):  
Taghreed A. Younis ◽  
Hadi J.M. Al-Agealy
Keyword(s):  
Critical Temperature ◽  
Quark Gluon Plasma ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Heavy Ion Collision ◽  
Hard Photon ◽  
Ion Collisions ◽  
Strength Models ◽  
Ion Collision

This work involves hard photon rate production from quark -gluon plasma QGP interaction in heavy ion collision. Using a quantum chromodynamic model to investigate and calculation of photons rate in 𝑐𝑔 → 𝑠𝑔𝛾 system due to strength coupling, photons rate, temperature of system, flavor number and critical. The photons rate production computed using the perturbative strength models for QGP interactions. The strength coupling was function of temperature of system, flavor number and critical temperature. Its influenced by force with temperature of system, its increased with decreased the temperature and vice versa. The strength coupling has used to examine the confinement and deconfinement of quarks in QGP properties and influence on the photon rate production. In our approach, we calculate the photons rate depending on the strength coupling, photons rate and temperature of system with other factors. The results plotted as a function of the photons energy. The photons rate was decreased with increased temperature and increased with decreased with strength coupling.

scholarly journals Effect of Magnetic Field on Dilepton Production Rate in Relativistic Heavy Ion Collisions

2020 ◽  
Vol 12 (2) ◽  
pp. 215-221
Author(s):  
P. K. Sethy ◽  
Y. Kumar ◽  
S. S. Singh
Keyword(s):  
Magnetic Field ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Particle Model ◽  
Heavy Ion Collision ◽  
Dilepton Production ◽  
Quasi Particle ◽  
Ion Collisions ◽  
Ion Collision ◽  
Good Agreement

It is believed that a transient strong magnetic field is generated in heavy-ion collision. The strength of this field perpendicular to the reaction plane and is estimated to be around eB=0.03GeV2 at RHIC and eB=0.3GeV2 at LHC. We study the effect of this magnetic field on dilepton yield using a modified quasi particle model. The results show a clear enhancement in dilepton yield and our result is in good agreement with the recently reported results.

Semiclassical approach to sequential fission in peripheral collisions

2014 ◽  
Vol 23 (12) ◽  
pp. 1450081 ◽  
Author(s):  
A. Strazzeri ◽  
A. Italiano
Keyword(s):  
Closed Form ◽  
Heavy Ion ◽  
Heavy Ion Collision ◽  
Semiclassical Approach ◽  
Peripheral Collision ◽  
Polarization Effects ◽  
Peripheral Collisions ◽  
Ion Collision

A closed-form semiclassical approach describing in a single picture both the evaporation component and the fast nonequilibrium component of the sequential fission of projectile-like (PL) fragments in a peripheral heavy-ion collision is derived and then applied to the dynamical fission observed in the 124 Sn +64 Ni peripheral collision at 35A MeV. Information on opposite polarization effects of the fissioning PL fragments and on "dynamical fission lifetimes" are obtained.

scholarly journals Temperature fluctuations and Tsallis statistics in relativistic heavy ion collisions

2021 ◽  
pp. 2150152
Author(s):  
Abhisek Saha ◽  
Soma Sanyal
Keyword(s):  
Heavy Ion Collisions ◽  
Temperature Fluctuations ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Heavy Ion Collision ◽  
Tsallis Statistics ◽  
Hadronic Phase ◽  
Ion Collisions ◽  
Ion Collision ◽  
Entropic Index

In this paper, we study temperature fluctuations in the initial stages of the relativistic heavy ion collision using a multiphase transport model. We consider the plasma in the initial stages after collision before it has a chance to equilibrate. We have considered [Formula: see text] collision with a center-of-mass energy of 200 GeV. We use the nonextensive Tsallis statistics to find the entropic index in the partonic stages of the relativistic heavy ion collisions. We find that the temperature and the entropic index have a linear relationship during the partonic stages of the heavy ion collision. This has already been observed in the hadronic phase. A detailed analysis of the dependence of the entropic index on the system shows that for increasing spacetime rapidity, the entropic index of the partonic system increases. The entropic index also depends on the beam collision energy. The calculation of the entropic index from the experimental data fitting of the transverse momenta deals with the hadronic phase. However, our study shows that the behavior of the entropic index in the initial nonequilibrium stage of the collision is very similar to the behavior of the entropic index in the hadronic stage.

Free energy of a baryon at finite temperatures and its implications to the heavy-ion collisions

2015 ◽  
Vol 30 (26) ◽  
pp. 1550130
Author(s):  
Minati Biswal ◽  
Sanatan Digal ◽  
P. S. Saumia
Keyword(s):  
Free Energy ◽  
Transition Temperature ◽  
Chemical Potential ◽  
Canonical Formalism ◽  
Heavy Ion ◽  
Polyakov Loop ◽  
Heavy Ion Collision ◽  
Hydrodynamic Simulations ◽  
Ion Collisions ◽  
Ion Collision

We study the free energy per baryon using canonical formalism in the Polyakov loop Nambu–Jona-Lasinio model with imaginary chemical potential. We find that the free energy decreases rapidly with temperature around the transition temperature. This result coupled with the heavy-ion collision geometry leads to the creation of a free energy well for the baryons. We study the time evolution of this free energy well using hydrodynamic simulations and discuss the implications of this free energy well on the dynamics of the baryons.

scholarly journals Application of FHCal for Heavy-Ion Collision Centrality Determination in MPD/NICA Experiment

Particles ◽  
2021 ◽  
Vol 4 (2) ◽  
pp. 236-240
Author(s):  
Vadim Volkov ◽  
Marina Golubeva ◽  
Fedor Guber ◽  
Alexander Ivashkin ◽  
Nikolay Karpushkin ◽  
...  
Keyword(s):  
Time Projection Chamber ◽  
Energy Deposition ◽  
Heavy Ion ◽  
Heavy Ion Collision ◽  
Energy Distributions ◽  
Hadron Calorimeter ◽  
Collision Centrality ◽  
Time Projection ◽  
Ion Collision

Two approaches related to the centrality determination in heavy-ion Multi-Purpose Detector (MPD) experiments, using charge-particles multiplicity in Time Projection Chamber (TPC) and the energy deposition in Forward Hadron Calorimeter (FHCal) are discussed. The main features of the FHCal are the fine transverse segmentation and the beam holes in the center of the calorimeters. Leaking the heavy non-interacting fragments (spectators) leads to ambiguity in the dependence of energy deposition in the FHCal on the collision centrality. However, the calorimeter transverse segmentation allows one to measure the energy distributions in each of the FHCal modules and to construct combined observables to resolve the problems associated with the beam hole. The comparison of these approaches in the collision centrality measurements is discussed.

Dynamical fission following peripheral heavy-ion collisions

2016 ◽  
Vol 25 (02) ◽  
pp. 1650011
Author(s):  
A. Strazzeri ◽  
A. Italiano
Keyword(s):  
Reaction Mechanism ◽  
Closed Form ◽  
Theoretical Approach ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Heavy Ion Collision ◽  
Polarization Effects ◽  
Fast Fission ◽  
Ion Collisions ◽  
Ion Collision

A closed-form theoretical approach describing in a single picture both the evaporation component and the fast nonequilibrium component of the sequential fission of projectile-like fragments in a peripheral heavy-ion collision is derived and then applied to the dynamical fission observed in the [Formula: see text]+[Formula: see text] semiperipheral collision at 35A[Formula: see text]MeV. Information on the reaction mechanism is obtained such as the opposite polarization effects and the estimate of the “formation-to-fast fission lifetimes” of the fissioning fragment.

scholarly journals SEARCH FOR DCC IN RELATIVISTIC HEAVY-ION COLLISIONS: POSSIBILITIES AND LIMITATIONS

2004 ◽  
Vol 19 (09) ◽  
pp. 1453-1474 ◽  
Author(s):  
B. MOHANTY ◽  
T. K. NAYAK ◽  
Y. P. VIYOGI ◽  
D. P. MAHAPATRA
Keyword(s):  
Experimental Observation ◽  
Neutral Pion ◽  
Heavy Ion ◽  
Chiral Condensate ◽  
Relativistic Heavy Ion Collisions ◽  
Discrete Wavelet ◽  
Heavy Ion Collision ◽  
Ion Collisions ◽  
Disoriented Chiral Condensate ◽  
Ion Collision

The experimental observation of disoriented chiral condensate is affected due to various physical and detector related effects. We study and quantify the strength of the experimental signal, "neutral pion fraction" within the framework of a simple DCC model, using the analysis methods based on the multi-resolution discrete wavelet technique and by evaluating the signal to background ratio. The scope and limitations of DCC search in heavy-ion collision experiments using various combination of detector systems are investigated.

scholarly journals Dense and hot matter in compact stars and heavy-ion collisions

2018 ◽  
Vol 171 ◽  
pp. 08002
Author(s):  
Stefan Schramm ◽  
Veronica Dexheimer ◽  
Ayon Mukherjee ◽  
Jan Steinheimer
Keyword(s):  
Compact Star ◽  
Heavy Ion ◽  
Compact Stars ◽  
Heavy Ion Collision ◽  
Exotic Particles ◽  
Ion Collisions ◽  
Hot Matter ◽  
Doublet Model ◽  
Effective Models ◽  
Ion Collision

We discuss the effect of exotic particles in neutron star matter and the corresponding impact on gross properties of neutron stars within effective models for the strong interaction. Particularly, for the quark-hadron parity-doublet model, we show results for compact star properties and discuss the phase structure of the model and its possible relevance for heavy-ion collision phenomenology.

scholarly journals HEAVY-ION COLLISION PHENOMENOLOGY

1991 ◽  
Vol 06 (15) ◽  
pp. 2569-2581 ◽  
Author(s):  
M. JACOB
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Heavy Ion Collision ◽  
Full Version ◽  
Ion Collisions ◽  
Ion Collision

This review is the full version of an invited contribution to the session on heavy-ion collisions at the Singapore Conference, where several topical points were discussed in detail, through a series of talks.

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