scholarly journals Transverse energy and charged particle production in heavy-ion collisions: From RHIC to LHC

2014 ◽  
Vol 23 (04) ◽  
pp. 1450024 ◽  
Author(s):  
Raghunath Sahoo ◽  
Aditya Nath Mishra
Keyword(s):  
Charged Particle ◽  
Energy Production ◽  
Transverse Energy ◽  
Particle Production ◽  
Hadron Collider ◽  
Heavy Ion ◽  
Universal Function ◽  
Particle Multiplicity ◽  
Charged Particle Multiplicity ◽  
Relativistic Heavy Ion Collider

We study the charged particle and transverse energy production mechanism from AGS, SPS, Relativistic Heavy-Ion Collider (RHIC) to Large Hadron Collider (LHC) energies in the framework of nucleon and quark participants. At RHIC and LHC energies, the number of nucleons-normalized charged particle and transverse energy density in pseudorapidity, which shows a monotonic rise with centrality, turns out to be an almost centrality independent scaling behavior when normalized to the number of participant quarks. A universal function which is a combination of logarithmic and power-law, describes well the charged particle and transverse energy production both at nucleon and quark participant level for the whole range of collision energies. Energy dependent production mechanisms are discussed both for nucleonic and partonic level. Predictions are made for the pseudorapidity densities of transverse energy, charged particle multiplicity and their ratio (the barometric observable, [Formula: see text]) at mid-rapidity for Pb + Pb collisions at [Formula: see text]. A comparison with models based on gluon saturation and statistical hadron gas is made for the energy dependence of [Formula: see text].

scholarly journals Comprehending particle production at RHIC and LHC energies using global measurements

2017 ◽  
Vol 32 (12) ◽  
pp. 1750060
Author(s):  
Sadhana Dash ◽  
Basanta K. Nandi ◽  
Ranjit Nayak ◽  
Ashutosh Kumar Pandey ◽  
Priyanka Sett
Keyword(s):  
Transverse Energy ◽  
Particle Production ◽  
Hadron Collider ◽  
Heavy Ion ◽  
Particle Multiplicity ◽  
Charged Particle Multiplicity ◽  
Relativistic Heavy Ion Collider ◽  
Ion Collisions ◽  
Relative Contribution ◽  
Two Component

The centrality dependence of the charged-particle multiplicity densities [Formula: see text] and transverse energy densities [Formula: see text] are investigated using the two-component Glauber approach for broad range of energies in heavy ion collisions at Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC). A comprehensive study shows that the data is well-described within the framework of two-component model which includes the contribution of “soft processes” and “hard processes” for different centrality classes and energies. The data at two different energies are compared by means of the ratio of [Formula: see text] (and [Formula: see text]) to see the interplay of energy scaling and relative contribution of hard processes.

scholarly journals Particle Production in XeXe Collisions at the LHC within the Integrated Hydrokinetic Model

Particles ◽  
2020 ◽  
Vol 3 (1) ◽  
pp. 114-122
Author(s):  
Yuri Sinyukov ◽  
Musfer Adzhymambetov ◽  
Volodymyr Shapoval
Keyword(s):  
Particle Production ◽  
Particle Number ◽  
Theoretical Study ◽  
Hadron Collider ◽  
Heavy Ion ◽  
Measured Data ◽  
Particle Multiplicity ◽  
Charged Particle Multiplicity ◽  
Relativistic Heavy Ion Collider ◽  
Collision Type

The paper is devoted to the theoretical study of particle production in the Large Hadron Collider (LHC) Xe+Xe collisions at the energy s N N = 5 . 44 TeV. The description of common bulk observables, such as mean charged particle multiplicity, particle number ratios, and p T spectra, is obtained within the integrated hydrokinetic model, and the simulation results are compared to the corresponding experimental points. The comparison shows that the model is able to adequately describe the measured data for the considered collision type, similarly as for the cases of Pb+Pb LHC collisions and top Relativistic Heavy Ion Collider (RHIC) energy Au+Au collisions, analyzed in our previous works.

scholarly journals Study of charged-particle multiplicity fluctuations in pp collisions with Monte Carlo event generators at the LHC

2020 ◽  
Vol 29 (09) ◽  
pp. 2050074
Author(s):  
E. Shokr ◽  
A. H. El-Farrash ◽  
A. De Roeck ◽  
M. A. Mahmoud
Keyword(s):  
Charged Particle ◽  
Particle Production ◽  
Local Density ◽  
Particle Density ◽  
Hadron Collider ◽  
Center Of Mass ◽  
Monte Carlo Event ◽  
Particle Multiplicity ◽  
Charged Particle Multiplicity ◽  
Proton Proton

Proton–Proton ([Formula: see text]) collisions at the Large Hadron Collider (LHC) are simulated in order to study events with a high local density of charged particles produced in narrow pseudorapidty windows of [Formula: see text] = 0.1, 0.2, and 0.5. The [Formula: see text] collisions are generated at center of mass energies of [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text] TeV, i.e., the energies at which the LHC has operated so far, using PYTHIA and HERWIG event generators. We have also studied the average of the maximum charged-particle density versus the event multiplicity for all events, using the different pseudorapidity windows. This study prepares for the multi-particle production background expected in a future search for anomalous high-density multiplicity fluctuations using the LHC data.

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.

scholarly journals IDENTICAL MESON INTERFEROMETRY IN STAR EXPERIMENT

2007 ◽  
Vol 16 (07n08) ◽  
pp. 1883-1889 ◽  
Author(s):  
◽  
DEBASISH DAS
Keyword(s):  
Particle Production ◽  
Star Collaboration ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Transverse Mass ◽  
Particle Multiplicity ◽  
Charged Particle Multiplicity ◽  
Time Dynamics ◽  
Ion Collisions ◽  
Freeze Out

The influence of Bose–Einstein statistics on multi-particle production characterized for various systems and energies by the STAR collaboration provides interesting information about the space-time dynamics of relativistic heavy-ion collisions at RHIC. We present the centrality and transverse mass dependence measurements of the two-pion interferometry in Au + Au collisions at [Formula: see text] and Cu + Cu collisions at [Formula: see text] and 200 GeV. We compare the new data with previous STAR measurements from p + p , d + Au and Au + Au collisions at [Formula: see text]. In all systems and centralities, HBT radii decrease with transverse mass in a similar manner, which is qualitatively consistent with collective flow. The scaling of the apparent freeze-out volume with the number of participants and charged particle multiplicity is studied. Measurements of Au + Au collisions at same centralities and different energies yield different freeze-out volumes, which mean that N part is not a suitable scaling variable. The multiplicity scaling of the measured HBT radii is found to be independent of colliding system and collision energy.

scholarly journals Small collision systems: Theory overview on cold nuclear matter effects

2018 ◽  
Vol 171 ◽  
pp. 11001
Author(s):  
Néstor Armesto
Keyword(s):  
Nuclear Matter ◽  
Particle Production ◽  
Hadron Collider ◽  
Heavy Ion ◽  
Smooth Transition ◽  
Relativistic Heavy Ion Collider ◽  
Cold Nuclear Matter ◽  
Proton Proton ◽  
Small Systems ◽  
Matter Effects

Many observables measured at the Relativistic Heavy Ion Collider and the Large Hadron Collider show a smooth transition between proton-proton and protonnucleus collisions (small systems), and nucleus-nucleus collisions (large systems), when represented versus some variable like the multiplicity in the event. In this contribution I review some of the physics mechanisms, named cold nuclear matter effects, that may lead to a collective-like behaviour in small systems beyond the macroscopic description provided by relativistic hydrodynamics. I focus on the nuclear modification of parton densities, single inclusive particle production and correlations.

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