Fluctuations and correlations of conserved charges in an excluded-volume hadron resonance gas model

Bhattacharyya, Abhijit; Das, S.; Ghosh, S. K.; Ray, Rajarshi; Samanta, Subhasis

doi:10.1103/physrevc.90.034909

Cited by 69 publications

(56 citation statements)

References 115 publications

(169 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They may also be useful as signatures of a possible phase transition or crossover [16,59,[121][122][123][124][125][126][127][128][129]. The pressure of the system at a given temperature and arbitrary chemical potentials may be expanded as a Taylor series around zero chemical potentials.…”

Section: Thermodynamicsmentioning

confidence: 99%

Reparametrizing the Polyakov–Nambu–Jona-Lasinio model

et al. 2017

Self Cite

View full text Add to dashboard Cite

The Polyakov−Nambu−Jona-Lasinio model has been quite successful in describing various qualitative features of observables for strongly interacting matter, that are measurable in heavy-ion collision experiments. The question still remains on the quantitative uncertainties in the model results. Such an estimation is possible only by contrasting these results with those obtained from first principles using the lattice QCD framework. Recently a variety of lattice QCD data were reported in the realistic continuum limit. Here we make a first attempt at reparametrizing the model so as to reproduce these lattice data. We find excellent quantitative agreement for the equation of state. Certain discrepancies in the charge and strangeness susceptibilities as well as baryon-charge correlation still remain. We discuss their causes and outline possible directions to remove them.

show abstract

Section: Thermodynamicsmentioning

confidence: 99%

Reparametrizing the Polyakov–Nambu–Jona-Lasinio model

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…The determination of the last surface of inelastic scattering, the chemical freezeout surface (CFO), is an integral part of the standard model of heavy ion collision [1][2][3][4]. An ideal gas of all the confirmed hadrons and resonances as listed by the Particle Data Group (PDG) [5] forms the Hadron Resonance Gas (HRG) model that has met with considerable success across a broad range of beam energies in describing the mean hadron yields [1][2][3][4][6][7][8] and more recently moments of conserved charges of QCD like baryon number (B), strangeness (S) and charge (Q) [9][10][11][12] with a few thermal parameters. Such an analysis gives us an access to the thermodynamic state of the fireball just prior to freezeout.…”

Section: Introductionmentioning

confidence: 99%

Freezeout systematics due to the hadron spectrum

et al. 2017

Self Cite

View full text Add to dashboard Cite

We investigate systematics of the freezeout surface in heavy ion collisions due to the hadron spectrum. The role of suspected resonance states that are yet to be confirmed experimentally in identifying the freezeout surface has been investigated. We have studied two different freezeout schemes - unified freezeout scheme where all hadrons are assumed to freezeout at the same thermal state and a flavor dependent sequential freezeout scheme with different freezeout thermal states for hadrons with or without valence strange quarks. The data of mean hadron yields as well as scaled variance of net proton and net charge distributions have been analysed. We find the freezeout temperature $T$ to drop by $\sim5\%$ while the dimensionless freezeout parameters $\mu_B/T$ and $VT^3$ ($\mu_B$ and $V$ are the baryon chemical potential and the volume at freezeout respectively) are insensitive to the systematics of the input hadron spectrum. The observed hint of flavor hierarchy in $T$ and $VT^3$ with only confirmed resonances survives the systematics of the hadron spectrum. It is more prominent between $\sqrt{s_{NN}}\sim10 - 100$ GeV where the maximum hierarchy in $T\sim10\%$ and $VT^3\sim40\%$. However, the uncertainties in the thermal parameters due to the systematics of the hadron spectrum and their decay properties do not allow us to make a quantitative estimate of the flavor hierarchy yet.Comment: version accepted for publicatio

show abstract

“…Detailed discussions of the different versions of HRG model and some of the recent works using these models may be found in Refs. [37,[39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54]. In this work we plan to discuss the simplest version namely the non-interacting HRG.…”

mentioning

confidence: 99%

Thermodynamics and fluctuations of conserved charges in a hadron resonance gas model in a finite volume

et al. 2015

Self Cite

View full text Add to dashboard Cite

The thermodynamics of hot and dense matter created in heavy-ion collision experiments are usually studied as a system of infinite volume. Here we report on possible effects for considering a finite system size for such matter in the framework of the Hadron Resonance Gas model. The bulk thermodynamic variables as well as the fluctuations of conserved charges are considered. We find that the finite size effects are insignificant once the observables are scaled with the respective volumes. The only substantial effect is found in the fluctuations of electric charge which may therefore be used to extract information about the volume of fireball created in heavy-ion collision experiments.PACS numbers: 12.38. Mh,21.65.Mn, Our present day universe contains a significant fraction of matter in hadronic form. In the very early universe − a few microseconds after the Big Bang [1] when the temperature was extremely high, the strongly interacting matter is expected to have existed in the partonic form. Similar exotic state of matter may exist inside compact stars due to extremely high matter density attained by gravitational compression [2]. For the last few decades various experimental efforts are being made to recreate such exotic matter through the collisions of heavy-ions at ultra-relativistic energies. Experimental facilities at CERN (France/Switzerland), BNL (USA) and the upcoming facility at GSI (Germany) are at the forefront of efforts taken to create these exotic states of matter. One of the major goals in the experiments is to study thermodynamic properties of strongly interacting matter at high temperatures and densities. Present experimental data as well as lattice QCD simulations seem to indicate a smooth cross over from hadronic to quark gluon matter at low density and high temperature [3,4]. At high density and low temperature a first order transition is expected [5][6][7][8][9][10].Usually any thermodynamic study assumes the system volume to be infinite. However the fireball created in the relativistic heavy ion collision experiments has a finite spatial volume. The size of such spatial volume critically depends on three parameters : the size of the colliding nuclei, the center of mass energy ( √ s) and the centrality of collisions. Analysis of experimental data could reveal the freeze out volume of the system. One way to carry out such an analysis is the study of HBT radii which has been done in Ref.[11]. The major finding of this study indicates that the freeze out volume increases as the √ s increases and the estimated freeze out volume varies from 2000 f m 3 to 3000 f m 3 . Another way of estimating the system size is through the comparison of simulation results with the experimental data as done in Ref. [12] where the UrQMD model [13] is used for this purpose. A study of the P b − P b collisions at different energies and centralities resulted in a freeze-out volume in the range 50 f m 3 to 250 f m 3 . We note that these volumes as quoted above, are the freeze out volumes and as one looks back to the early...

show abstract

Fluctuations and correlations of conserved charges in an excluded-volume hadron resonance gas model

Cited by 69 publications

References 115 publications

Reparametrizing the Polyakov–Nambu–Jona-Lasinio model

Reparametrizing the Polyakov–Nambu–Jona-Lasinio model

Freezeout systematics due to the hadron spectrum

Thermodynamics and fluctuations of conserved charges in a hadron resonance gas model in a finite volume

Contact Info

Product

Resources

About