scholarly journals Charged Hadron Multiplicity Distribution at Relativistic Heavy-Ion Colliders

2013 ◽  
Vol 2013 ◽  
pp. 1-27 ◽  
Author(s):  
Ashwini Kumar ◽  
P. K. Srivastava ◽  
B. K. Singh ◽  
C. P. Singh
Keyword(s):  
Particle Production ◽  
Center Of Mass ◽  
Quantitative Description ◽  
Heavy Ion ◽  
High Energy ◽  
Charged Hadron ◽  
Theoretical Concepts ◽  
Ion Collisions ◽  
Hadron Multiplicity ◽  
High Energy Collisions

The present paper reviews facts and problems concerning charge hadron production in high energy collisions. Main emphasis is laid on the qualitative and quantitative description of general characteristics and properties observed for charged hadrons produced in such high energy collisions. Various features of available experimental data, for example, the variations of charged hadron multiplicity and pseudorapidity density with the mass number of colliding nuclei, center-of-mass energies, and the collision centrality obtained from heavy-ion collider experiments, are interpreted in the context of various theoretical concepts and their implications. Finally, several important scaling features observed in the measurements mainly at RHIC and LHC experiments are highlighted in the view of these models to draw some insight regarding the particle production mechanism in heavy-ion collisions.

Very-high-energy light charged-particle production near 0° in heavy-ion collisions, 9≤E/A≤40 MeV

1990 ◽  
Vol 42 (4) ◽  
pp. 1519-1529 ◽  
Author(s):  
S. Shaheen ◽  
F. D. Becchetti ◽  
D. A. Roberts ◽  
J. W. Jänecke ◽  
R. L. Stern ◽  
...  
Keyword(s):  
Charged Particle ◽  
Heavy Ion Collisions ◽  
Particle Production ◽  
Heavy Ion ◽  
High Energy ◽  
Light Charged Particle ◽  
Ion Collisions ◽  
Charged Particle Production ◽  
Very High Energy ◽  
Very High

scholarly journals JET AND HIGH PT MEASUREMENTS WITH THE ALICE EXPERIMENT

2011 ◽  
Vol 20 (07) ◽  
pp. 1533-1538
Author(s):  
◽  
CHRISTIAN KLEIN-BÖSING
Keyword(s):  
Particle Production ◽  
Center Of Mass ◽  
Heavy Ion ◽  
First Year ◽  
Alice Experiment ◽  
Elementary Reactions ◽  
Ion Collisions ◽  
New Energy ◽  
First Results ◽  
Medium Influence

Since the beginning of 2010 the LHC provides p + p collisions at the highest center of mass energies to date, allowing to study high p T particle production and jet properties in a new energy regime. For a clear interpretation and the quantification of the medium influence in heavy-ion collisions on high p T observables a detailed understanding of these elementary reactions is essential. We present first results on the observation of jet-like properties with the ALICE experiment and discuss the performance of jet reconstruction in the first year of data taking.

scholarly journals Hadron Spectra Parameters within the Non-Extensive Approach

Universe ◽  
2019 ◽  
Vol 5 (5) ◽  
pp. 122 ◽  
Author(s):  
Keming Shen ◽  
Gergely Gábor Barnaföldi ◽  
Tamás Sándor Biró
Keyword(s):  
High Energy Physics ◽  
Center Of Mass ◽  
Heavy Ion ◽  
High Energy ◽  
Proton Proton ◽  
Center Of Mass Energy ◽  
Ion Collisions ◽  
Hadron Spectra ◽  
Hadron Mass ◽  
Energy Scaling

We investigate how the non-extensive approach works in high-energy physics. Transverse momentum ( p T ) spectra of several hadrons are fitted by various non-extensive momentum distributions and by the Boltzmann–Gibbs statistics. It is shown that some non-extensive distributions can be transferred one into another. We find explicit hadron mass and center-of-mass energy scaling both in the temperature and in the non-extensive parameter, q, in proton–proton and heavy-ion collisions. We find that the temperature depends linearly, but the Tsallis q follows a logarithmic dependence on the collision energy in proton–proton collisions. In the nucleus–nucleus collisions, on the other hand, T and q correlate linearly, as was predicted in our previous work.

scholarly journals Hawking-Unruh Hadronization and Strangeness Production in High Energy Collisions

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Paolo Castorina ◽  
Helmut Satz
Keyword(s):  
Quark Mass ◽  
Particle Production ◽  
Mass Effect ◽  
Heavy Ion ◽  
Strange Particle ◽  
High Energy ◽  
Relativistic Heavy Ion Collisions ◽  
Thermalization Time ◽  
Strange Particle Production ◽  
High Energy Collisions

The thermal multihadron production observed in different high energy collisions poses many basic problems: why do even elementary,e+e-and hadron-hadron, collisions show thermal behaviour? Why is there in such interactions a suppression of strange particle production? Why does the strangeness suppression almost disappear in relativistic heavy ion collisions? Why in these collisions is the thermalization time less than≃0.5 fm/c? We show that the recently proposed mechanism of thermal hadron production through Hawking-Unruh radiation can naturally answer the previous questions. Indeed, the interpretation of quark (q)-antiquark (q̅) pairs production, by the sequential string breaking, as tunneling through the event horizon of colour confinement leads to thermal behavior with a universal temperature,T≃170 Mev, related to the quark acceleration,a, byT=a/2π. The resulting temperature depends on the quark mass and then on the content of the produced hadrons, causing a deviation from full equilibrium and hence a suppression of strange particle production in elementary collisions. In nucleus-nucleus collisions, where the quark density is much bigger, one has to introduce an average temperature (acceleration) which dilutes the quark mass effect and the strangeness suppression almost disappears.

scholarly journals Measurements of jets in heavy ion collisions

2018 ◽  
Vol 172 ◽  
pp. 05010 ◽  
Author(s):  
Christine Nattrass
Keyword(s):  
Energy Loss ◽  
Heavy Ion Collisions ◽  
Particle Production ◽  
Hadron Collider ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
High Energy ◽  
Jet Quenching ◽  
Relativistic Heavy Ion Collider ◽  
Ion Collisions

The Quark Gluon Plasma (QGP) is created in high energy heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC). This medium is transparent to electromagnetic probes but nearly opaque to colored probes. Hard partons produced early in the collision fragment and hadronize into a collimated spray of particles called a jet. The partons lose energy as they traverse the medium, a process called jet quenching. Most of the lost energy is still correlated with the parent parton, contributing to particle production at larger angles and lower momenta relative to the parent parton than in proton-proton collisions. This partonic energy loss can be measured through several observables, each of which give different insights into the degree and mechanism of energy loss. The measurements to date are summarized and the path forward is discussed.

Modified Heisenberg's Approach for the Mean Charged Hadron Multiplicity in High Energy Collisions

1978 ◽  
Vol 33 (4) ◽  
pp. 493-497
Author(s):  
D. C. Ghosh ◽  
I. K. Daftari ◽  
D. K. Bhattacharjee ◽  
S. C. Naha ◽  
A. Roy Chowdhury ◽  
...  
Keyword(s):  
Energy Range ◽  
High Energy ◽  
Charged Hadron ◽  
Entire Energy Range ◽  
Hadron Multiplicity ◽  
Entire Energy ◽  
High Energy Collisions ◽  
The Mean ◽  
Hadronic Collisions ◽  
Remarkable Agreement

The semiempirical formulation of Ghosh et al. for the energy dependence of multiplicity in hadronic collisions has been applied to account for the experimental multiplicity data of π±p and K±p collisions. A remarkable agreement has been found over the entire energy range.

scholarly journals Can Baryon Stopping Be Understood within a Hadronic Transport Approach

Proceedings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 2
Author(s):  
Justin Mohs ◽  
Sangwook Ryu ◽  
Hannah Elfner
Keyword(s):  
Heavy Ion Collisions ◽  
Particle Production ◽  
String Model ◽  
Heavy Ion ◽  
High Energy ◽  
Theoretical Understanding ◽  
Double Peak Structure ◽  
Ion Collisions ◽  
Transport Approach ◽  
Rapidity Spectrum

The changing shape of the rapidity spectrum of net protons over the SPS energy range is still lacking theoretical understanding. In this work, a model for string excitation and string fragmentation is implemented for the description of high energy collisions within a hadronic transport approach. The free parameters of the string model are tuned to reproduce the experimentally measured particle production in proton-proton collisions. With the fixed parameters we advance to calculations for heavy ion collisions, where the shape of the proton rapidity spectrum changes from a single peak to a double peak structure with increasing beam energy in the experiment. We present calculations of proton rapidity spectra at different SPS energies in heavy ion collisions. Qualitatively, a good agreement with the experimental findings is obtained. In a future work, the formation process of string fragments will be studied in detail aiming to quantitatively reproduce the measurement.

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