scholarly journals Resolving the hyper-triton yield description puzzle in high energy nuclear collisions

2021 ◽  
Vol 57 (2) ◽  
Author(s):  
O. V. Vitiuk ◽  
K. A. Bugaev ◽  
E. S. Zherebtsova ◽  
D. B. Blaschke ◽  
L. V. Bravina ◽  
...  
Keyword(s):  
Collision Energy ◽  
Hard Core ◽  
Star Collaboration ◽  
High Energy ◽  
Nuclear Collisions ◽  
Cluster Data ◽  
New Strategy ◽  
Nuclear Cluster ◽  
Chemical Freeze ◽  
Freeze Out

AbstractThe recently developed hadron resonance gas model with multicomponent hard-core repulsion is used to address and resolve the long standing problem to describe the light nuclear cluster multiplicities including the hyper-triton measured by the STAR Collaboration, known as the hyper-triton chemical freeze-out puzzle. An improved description for the hadronic and light nuclear cluster data measured by STAR at the collision energy $$\sqrt{s_{NN}} =200$$ s NN = 200 GeV and by ALICE at $$\sqrt{s_{NN}} =2.76$$ s NN = 2.76 TeV is obtained. This is achieved by applying a new strategy of analyzing the light nuclear cluster data and by using the value for the hard-core radius of the (anti-)$$\varLambda $$ Λ hyperons found in earlier work. One of the most striking results of the present work is that for the most probable scenario of chemical freeze-out for the STAR energy the obtained parameters allow to simultaneously reproduce the values of the experimental ratios $$S_3$$ S 3 and $${\overline{S}}_3$$ S ¯ 3 which were not included in the fit.

scholarly journals Chemical freeze-out of light nuclei in high energy nuclear collisions and resolution of the hyper-triton chemical freeze-out puzzle

2020 ◽  
Vol 1690 ◽  
pp. 012123
Author(s):  
K A Bugaev ◽  
O V Vitiuk ◽  
B E Grinyuk ◽  
N S Yakovenko ◽  
E S Zherebtsova ◽  
...  
Keyword(s):  
High Energy ◽  
Light Nuclei ◽  
Nuclear Collisions ◽  
Chemical Freeze ◽  
Freeze Out

scholarly journals On separate chemical freeze-outs of hadrons and light (anti)nuclei in high energy nuclear collisions

2019 ◽  
Vol 1390 ◽  
pp. 012038 ◽  
Author(s):  
K. A. Bugaev ◽  
B. E. Grinyuk ◽  
A. I. Ivanytskyi ◽  
V. V. Sagun ◽  
D. O. Savchenko ◽  
...  
Keyword(s):  
High Energy ◽  
Nuclear Collisions ◽  
Chemical Freeze

scholarly journals Freeze-Out Parameters in Heavy-Ion Collisions at AGS, SPS, RHIC, and LHC Energies

2015 ◽  
Vol 2015 ◽  
pp. 1-20 ◽  
Author(s):  
Sandeep Chatterjee ◽  
Sabita Das ◽  
Lokesh Kumar ◽  
D. Mishra ◽  
Bedangadas Mohanty ◽  
...  
Keyword(s):  
Transverse Momentum ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
High Energy ◽  
Particle Multiplicity ◽  
Charged Particle Multiplicity ◽  
Ion Collisions ◽  
Momentum Distributions ◽  
Chemical Freeze ◽  
Freeze Out

We review the chemical and kinetic freeze-out conditions in high energy heavy-ion collisions for AGS, SPS, RHIC, and LHC energies. Chemical freeze-out parameters are obtained using produced particle yields in central collisions while the corresponding kinetic freeze-out parameters are obtained using transverse momentum distributions of produced particles. For chemical freeze-out, different freeze-out scenarios are discussed such as single and double/flavor dependent freeze-out surfaces. Kinetic freeze-out parameters are obtained by doing hydrodynamic inspired blast wave fit to the transverse momentum distributions. The beam energy and centrality dependence of transverse energy per charged particle multiplicity are studied to address the constant energy per particle freeze-out criteria in heavy-ion collisions.

scholarly journals Separate freeze-out of strange particles and the quark-hadron phase transition

2018 ◽  
Vol 182 ◽  
pp. 02057
Author(s):  
K. Bugaev ◽  
V. Sagun ◽  
A. Ivanytskyi ◽  
E. Nikonov ◽  
J. Cleymans ◽  
...  
Keyword(s):  
Collision Energy ◽  
Center Of Mass ◽  
Suppression Factor ◽  
Hadron Phase ◽  
Hadron Multiplicity ◽  
Strange Particles ◽  
The One ◽  
Baryonic Charge ◽  
Chemical Freeze ◽  
Freeze Out

The scenario of the independent chemical freeze-outs for strange and nonstrange particles is discussed. Within such a scenario an apparent in-equilibrium of strangeness is naturally explained by a separation of chemical freeze-out of strange hadrons from the one of non-strange hadrons, which, nevertheless, are connected by the conservation laws of entropy, baryonic charge and third isospin projection. An interplay between the separate freeze-out of strangeness and its residual non-equilibrium is studied within an elaborate version of the hadron resonance gas model. The developed model enables us to perform a high-quality fit of the hadron multiplicity ratios measured at AGS, SPS and RHIC with an overall fit quality ϰ2/dof = 0:93. A special attention is paid to a description of the Strangeness Horn and to the well-known problem of selective suppression of Δ- and ж hyperons. It is remarkable that for all collision energies the strangeness suppression factor γs is about 1 within the error bars. The only exception is found in the vicinity of the center-of-mass collision energy 7.6 GeV, at which a residual enhancement of strangeness of about 20 % is observed.

scholarly journals Evidence of Early Multistrange Hadron Freeze-Out in High Energy Nuclear Collisions

1998 ◽  
Vol 81 (26) ◽  
pp. 5764-5767 ◽  
Author(s):  
H. van Hecke ◽  
H. Sorge ◽  
N. Xu
Keyword(s):  
High Energy ◽  
Nuclear Collisions ◽  
Freeze Out

scholarly journals Energy Dependence of Particle Ratios in High Energy Nucleus-Nucleus Collisions: A USTFM Approach

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Inam-ul Bashir ◽  
Rameez Ahmad Parra ◽  
Hamid Nanda ◽  
Saeed Uddin
Keyword(s):  
Particle Production ◽  
Chemical Potential ◽  
Heavy Ion ◽  
High Energy ◽  
Ion Collisions ◽  
System A ◽  
Particle Ratios ◽  
High Degree ◽  
Chemical Freeze ◽  
Freeze Out

We study the identified particle ratios produced at mid-rapidity (y<0.5) in heavy-ion collisions, along with their correlations with the collision energy. We employ our earlier proposed unified statistical thermal freeze-out model (USTFM), which incorporates the effects of both longitudinal and transverse hydrodynamic flow in the hot hadronic system. A fair agreement seen between the experimental data and our model results confirms that the particle production in these collisions is of statistical nature. The variation of the chemical freeze-out temperature and the baryon chemical potential with respect to collision energies is studied. The chemical freeze-out temperature is found to be almost constant beyond the RHIC energy and is found to be close to the QCD predicted phase-transition temperature suggesting that the chemical freeze-out occurs soon after the hadronization takes place. The vanishing value of chemical potential at LHC indicates very high degree of nuclear transparency in the collision.

scholarly journals Evidence of early multi-strange hadron freeze-out in high energy nuclear collisions

1999 ◽  
Vol 661 (1-4) ◽  
pp. 493-496 ◽  
Author(s):  
H. van Hecke ◽  
H. Sorge ◽  
N. Xu
Keyword(s):  
High Energy ◽  
Nuclear Collisions ◽  
Strange Hadron ◽  
Freeze Out

scholarly journals A Baseline Study of the Event-Shape and Multiplicity Dependence of Chemical Freeze-Out Parameters in Proton-Proton Collisions at \( {\sqrt{s}} \) = 13 TeV Using PYTHIA8

Physics ◽  
2020 ◽  
Vol 2 (4) ◽  
pp. 679-694
Author(s):  
Rutuparna Rath ◽  
Arvind Khuntia ◽  
Sushanta Tripathy ◽  
Raghunath Sahoo
Keyword(s):  
High Energy ◽  
Monte Carlo Event ◽  
Event Generator ◽  
Particle Multiplicity ◽  
Event Shape ◽  
Charged Particle Multiplicity ◽  
Pp Collisions ◽  
Proton Proton ◽  
Chemical Freeze ◽  
Freeze Out

The event-shape and multiplicity dependence of the chemical freeze-out temperature (Tch), freeze-out radius (R), and strangeness saturation factor (γs) are obtained by studying the particle yields from the PYTHIA8 Monte Carlo event generator in proton-proton (pp) collisions at the centre-of-mass s = 13 TeV. Spherocity is one of the transverse event-shape techniques to distinguish jetty and isotropic events in high-energy collisions and helps in looking into various observables in a more differential manner. In this study, spherocity classes are divided into three categories, namely (i) spherocity integrated, (ii) isotropic, and (iii) jetty. The chemical freeze-out parameters are extracted using a statistical thermal model as a function of the spherocity class and charged particle multiplicity in the canonical, strangeness canonical, and grand canonical ensembles. A clear observation of the multiplicity and spherocity class dependence of Tch, R, and γs is observed. A final state multiplicity, Nch≥ 30 in the forward multiplicity acceptance of the ALICE detector appears to be a thermodynamic limit, where the freeze-out parameters become almost independent of the ensembles. This study plays an important role in understanding the particle production mechanism in high-multiplicity pp collisions at the Large Hadron Collider (LHC) energies in view of a finite hadronic phase lifetime in small systems.

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