Title: The Tsallis Distribution at the LHC Author:Cleymans Jean Subject:Physics Description:
The Tsallis distribution has been used widely in high energy physics to describe the transverse momentum distributions of particles. In this note we show that the use of a thermodynamically consistent form of this distribution leads to a description of identified particles with the same values of the temperature T and the parameter q.
Is part of:
EPJ Web of conferences, 01 April 2014, Vol.70, p.00009
Identifier:
2100-014X (E-ISSN); 10.1051/epjconf/20147000009 (DOI)
Title: Status of the thermal model and chemical freeze-out Author:Cleymans Jean Subject:Physics Description:
A brief review is presented of the status of the thermal model and chemical freeze-out in relativistic heavy-ion collisions. Some interesting aspects at lower energies are emphasized.
Is part of:
EPJ Web of conferences, 01 January 2015, Vol.95, p.03004
Identifier:
2100-014X (E-ISSN); 10.1051/epjconf/20149503004 (DOI)
Title: Recent developments around chemical equilibrium Author:Cleymans, Jean Description:
Some recent results related to the possible chemical equilibration of hadrons in heavy ion collisions are reviewed. Overall the evidence is very strong with a few clear and well-documented deviations, especially concerning multi-strange hadrons. Two effects are considered in some detail. Firstly, the neglect of (possibly an infinite number) heavy resonances is investigated with the help of the Hagedorn model. Secondly, possible deviations from the standard statistical distributions are investigated by considering in detail results obtained using the Tsallis distribution.
Is part of:
Journal of Physics G: Nuclear and Particle Physics, 2010, Vol.37(9), p.094015 (7pp)
Identifier:
0954-3899 (ISSN); 1361-6471 (E-ISSN); 10.1088/0954-3899/37/9/094015 (DOI)
Randrup, Jørgen, Cleymans, Jean
The European Physical Journal A, 2016, Vol.52(8), pp.1-2
[Peer Reviewed Journal]
Springer Science & Business Media B.V.
Title: Exploring high-density baryonic matter: Maximum freeze-out density Author:Randrup, Jørgen; Cleymans, Jean Subject:Density – Analysis; Description:
The hadronic freeze-out line is calculated in terms of the net baryon density and the energy density instead of the usual T and $\mu_{B}$ . This analysis makes it apparent that the freeze-out density exhibits a maximum as the collision energy is varied. This maximum freeze-out density has $\mu_i{B} = 400 - 500$ MeV, which is above the critical value, and it is reached for a fixed-target bombarding energy of 20-30GeV/ N well within the parameters of the proposed NICA collider facility.
Is part of:
The European Physical Journal A, 2016, Vol.52(8), pp.1-2
Identifier:
1434-6001 (ISSN); 1434-601X (E-ISSN); 10.1140/epja/i2016-16218-7 (DOI)
Title: Non-extensive Fokker-Planck transport coefficients of heavy quarks Author:Bhattacharyya, Trambak; Cleymans, Jean Contributor:Cleymans, Jean (pacrepositoryorg) Subject:Quarks ; Quarks ; Coefficient of Variation ; Momentum Transfer ; Fokker-Planck Equation ; Mathematical Analysis ; Transport Properties ; Quark-Gluon Plasma ; Random Walk Description:
In presence of the non-ideal plasma effects, Heavy Quarks (HQs) carry out non linear random walk inside Quark-Gluon Plasma (QGP) and in the small momentum transfer limit, the evolution of the HQ distribution is dictated by the Non Linear Fokker-Planck Equation (NLFPE). Using the NLFPE, we calculate the transport coefficients (drag and diffusion) of heavy quarks travelling through QGP. We observe substantial modification in the momentum and temperature variation of the transport coefficients; and this will modify the physical picture we are having about the transport of heavy quarks inside QGP, and hence, about the characterisation of the plasma.
Is part of:
arXiv.org, Jul 26, 2017
Identifier:
2331-8422 (E-ISSN)
Title: Non-extensive Fokker-Planck transport coefficients of heavy quarks Author:Bhattacharyya, Trambak; Cleymans, Jean Subject:High Energy Physics - Phenomenology ; Nuclear Theory Description:
In presence of the non-ideal plasma effects, Heavy Quarks (HQs) carry out non linear random walk inside Quark-Gluon Plasma (QGP) and in the small momentum transfer limit, the evolution of the HQ distribution is dictated by the Non Linear Fokker-Planck Equation (NLFPE). Using the NLFPE, we calculate the transport coefficients (drag and diffusion) of heavy quarks travelling through QGP. We observe substantial modification in the momentum and temperature variation of the transport coefficients; and this will modify the physical picture we are having about the transport of heavy quarks inside QGP, and hence, about the characterisation of the plasma. Comment: 9 pages, 8 figures
Identifier:
1707.08425 (ARXIV ID)
Title: Thermodynamic limit in high-multiplicity \(pp\) collisions at \(\sqrt{s}\) = 7 TeV Author:Sharma, Natasha; Cleymans, Jean; Hippolyte, Boris Contributor:Hippolyte, Boris (pacrepositoryorg) Subject:Charged Particles ; Strangeness ; Collisions ; Mathematical Models ; Thermal Analysis ; Conservation ; Organic Chemistry ; Charged Particles Description:
An analysis is made of the particle composition in the final state of \(pp\) collisions at 7 TeV as a function of the charged particle multiplicity (\(dN_{ch}/d\eta\)). The thermal model is used to determine the chemical freeze-out temperature as well as the radius and strangeness suppression factor \(\gamma_s\). Three different ensembles are used in the analysis. The grand canonical ensemble, the canonical ensemble with exact strangeness conservation and the canonical ensemble with exact baryon number, strangeness and electric charge conservation. It is shown that for the highest multiplicity class the three ensembles lead to the same result. This allows us to conclude that this multiplicity class is close to the thermodynamic limit. It is estimated that the final state in \(pp\) collisions could reach the thermodynamic limit when \(dN_{ch}/d\eta\) is larger than twenty per unit of rapidity, corresponding to about 300 particles in the final state when integrated over the full rapidity...
Is part of:
arXiv.org, Jul 13, 2018
Identifier:
2331-8422 (E-ISSN)
Several versions
Analytic results for the Tsallis thermodynamic variables
Title: Thermal Model Description of p--Pb Collisions at $\sqrt{s_{NN}} $ = 5.02 TeV Author:Sharma, Natasha; Cleymans, Jean; Kumar, Lokesh Subject:High Energy Physics - Phenomenology ; Nuclear Theory Description:
The ALICE data on light flavor hadron production obtained in $p-Pb$ collisions at $\sqrt{s_{NN}} $ = 5.02 TeV are studied in the thermal model using the canonical approach with exact strangeness conservation. The chemical freeze-out temperature is independent of centrality except for the lowest multiplicity bin, with values close to 160 MeV but consistent with those obtained in $Pb-Pb$ collisions at $\sqrt{s_{NN}}$ = 2.76 TeV. The value of the strangeness non-equilibrium factor $\gamma_s$ is slowly increasing with multiplicity from 0.9 to 0.96, i.e. it is always very close to full chemical equilibrium. Comment: 10 pages, 12 figures
Identifier:
1802.07972 (ARXIV ID)