Determination of Freeze-out Conditions from Lattice QCD Calculations

Frithjof Karsch

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Determination of Freeze-out Conditions from Lattice QCD Calculations

Frithjof Karsch

High Energy Physics - Lattice · Submitted 19 Feb 2012

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim We discuss here how this model dependent determination of freeze-out parameters may eventually be replaced by theoretical predictions based on equilibrium QCD thermodynamics.

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Freeze-out conditions in Heavy Ion Collisions are generally determined by comparing experimental results for ratios of particle yields with theoretical predictions based on applications of the Hadron Resonance Gas model. We discuss here how this model dependent determination of freeze-out parameters may eventually be replaced by theoretical predictions based on equilibrium QCD thermodynamics.

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#	sentence	role	the authors' own work	states the main conclusion	strength
s0	Freeze-out conditions in Heavy Ion Collisions are generally determined by comparing experimental results for ratios of particle yields with theoretical predictions based on applications of the Hadron Resonance Gas model.	background 1.00	0.05	0.06	asserted 0.95
s1	We discuss here how this model dependent determination of freeze-out parameters may eventually be replaced by theoretical predictions based on equilibrium QCD thermodynamics.	future work 0.71	0.16	0.46	hedged possibility 1.00

What kind of paper the classifier reports this is: position or commentary 0.94 · evidence from argument 0.70.

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The paper

Original abstract

Freeze-out conditions in Heavy Ion Collisions are generally determined by comparing experimental results for ratios of particle yields with theoretical predictions based on applications of the Hadron Resonance Gas model. We discuss here how this model dependent determination of freeze-out parameters may eventually be replaced by theoretical predictions based on equilibrium QCD thermodynamics.

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References

Forward citations

Cited by 16 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

Off-diagonal correlators of conserved charges from lattice QCD and how to relate them to experiment
hep-lat 2019-10 conditional novelty 6.0 of 10

Continuum-extrapolated lattice correlators of baryon number, charge, and strangeness are matched to ratios of measured net-kaon and net-Lambda variances, and the strangeness ratio favors a 165 MeV freeze-out temperature.
Constraining the hadronic spectrum through QCD thermodynamics on the lattice
hep-lat 2017-02 conditional novelty 6.0 of 10

Lattice QCD partial pressures by strangeness sector show that established hadron lists under-predict the data, implying missing strange resonances or hadronic interactions beyond the free-gas model.
Freeze-out parameters: lattice meets experiment
hep-lat 2013-05 conditional novelty 6.0 of 10

Continuum-extrapolated lattice QCD susceptibilities of electric charge, compared to STAR net-charge moments, bound the freeze-out temperature below about 157 MeV and give baryon chemical potentials of roughly 44, 75, ...
Skewness, kurtosis and the 5th and 6th order cumulants of net baryon-number distributions from lattice QCD confront high-statistics STAR data
hep-lat 2020-01 conditional novelty 5.0 of 10

Equilibrium lattice QCD reproduces the STAR net-proton skewness and kurtosis ratios at 54.4 GeV near the pseudo-critical temperature, but predicts a negative sixth-order ratio where preliminary data are positive.
Higher order fluctuations and correlations of conserved charges from lattice QCD
hep-lat 2018-05 conditional novelty 5.0 of 10

Imaginary-chemical-potential lattice QCD at physical quark masses yields sixth-order conserved-charge fluctuations and cumulant ratios whose Taylor extrapolation qualitatively reproduces the STAR net-proton trend.

Show 11 more citing papers

Skewness and kurtosis of net baryon-number distributions at small values of the baryon chemical potential
hep-lat 2017-08 conditional novelty 5.0 of 10

Next-to-leading order lattice QCD calculations of net baryon-number cumulant ratios reproduce the qualitative features of STAR net-proton fluctuation data for beam energies down to 19.6 GeV.
Freeze-out parameters from electric charge and baryon number fluctuations: is there consistency?
hep-lat 2014-03 conditional novelty 5.0 of 10

Lattice QCD fluctuation results compared with STAR net-proton and net-charge moments yield consistent freeze-out chemical potentials from two independent conserved charges, with the freeze-out temperature bounded abov...
Fluctuations and Correlations of net baryon number, electric charge, and strangeness: A comparison of lattice QCD results with the hadron resonance gas model
hep-lat 2012-03 accept novelty 5.0 of 10

Continuum-extrapolated lattice QCD shows the hadron resonance gas model fails above about 150 MeV, with net charge fluctuations 10 to 20 percent low and net strangeness fluctuations about 20 percent high near 160 to 170 MeV.
The BEST framework for the search for the QCD critical point and the chiral magnetic effect
nucl-th 2021-08 accept novelty 4.0 of 10

The BEST Collaboration summarizes the modular modeling framework it has built to connect RHIC Beam Energy Scan measurements to the QCD critical point and the chiral magnetic effect.
Future physics opportunities for high-density QCD at the LHC with heavy-ion and proton beams
hep-ph 2018-12 accept novelty 4.0 of 10

A community planning report that sets the heavy-ion physics priorities for LHC Runs 3 and 4 and estimates the luminosity and detector performance needed to reach them.
Decoding the phase structure of QCD via particle production at high energy
nucl-th 2017-10 conditional novelty 4.0 of 10

Thermal fits to hadron yields in nuclear collisions yield a freeze-out temperature that tracks the lattice-QCD pseudo-critical line, which the authors read as an experimental determination of the QCD phase boundary.
Dynamics of critical fluctuations: Theory -- phenomenology -- heavy-ion collisions
nucl-th 2020-01 accept novelty 2.0 of 10

The report argues that fluctuation observables can only be interpreted with a fully dynamical framework, and compares stochastic fluid dynamics, hydro-kinetics, and the experimental corrections each requires.
Lattice QCD and heavy ion collisions: a review of recent progress
hep-lat 2018-04 accept novelty 2.0 of 10

Lattice QCD, now run at physical quark masses in the continuum limit, reproduces heavy-ion freeze-out temperatures and the QCD equation of state, and this review documents where theory and data agree and where they st...
Fluctuations of conserved charges in relativistic heavy ion collisions: An introduction
nucl-th 2015-12 accept novelty 2.0 of 10

A pedagogical survey of cumulants of conserved charges in heavy ion collisions, covering their statistical-mechanics definitions, their equilibrium values in hadron-resonance-gas and deconfined matter, and the non-equ...
Properties of hot and dense matter from relativistic heavy ion collisions
nucl-th 2015-10 accept novelty 2.0 of 10

Collisions of heavy nuclei at RHIC and the LHC produce a locally thermalized, nearly perfect fluid whose equation of state, transport coefficients, and freeze-out conditions can be read off bulk observables.
Thermodynamics of strong-interaction matter from Lattice QCD
hep-lat 2015-04 accept novelty 2.0 of 10

First-principles lattice QCD fixes the crossover temperature of hot strong-interaction matter at 154 ± 9 MeV and its equation of state, with controlled but limited extensions to nonzero baryon density.

How the literature uses it

25 arXiv papers cite this in 31 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 25 sentences without a confident label

Uses its method or tool 2 papers

In order to extract the chemical freeze-out temperature from the lattice we use ratios of susceptibilities as discussed in [ref] .

Strangeness at finite temperature from Lattice QCD · Introduction · 0.98
Following the specific strategy proposed in [ref] one first extracts the dependence of the cumulants on the chemical potential $_X=(_B,_Q,_S)$.

Properties of hot and dense matter from relativistic heavy ion collisions · Freeze-out conditions · 0.97

Compares with it 1 paper

The present data on moments of both the net proton number and the net charge at the higher BES-I energies are already very useful, as they can be compared to lattice calculations of the Taylor expansions (in $μ_B/T$) of the baryon number and charge susceptibilities [ref] .

Exploring the properties of the phases of QCD matter - research opportunities and priorities for the next decade · Mapping the QCD phase diagram · 0.90

Cites it as background 3 papers

The strategy for a successful comparison between theory and experiment has been long worked on [ref] .

Freeze-out parameters from continuum extrapolated lattice data · Introduction · 0.91
Although strategies have been developed to extract freeze-out conditions from observables that are directly accessible to experiment as well as calculations within QCD [ref] , applying these in practice is still hampered by large statistical errors and our poor control over systematic effects entering the measurement of higher order cumulants of charge fluctuations.

QCD thermodynamics in the crossover/freeze-out region · Introduction · 0.82
The former have been extensively studied with lattice simulations [ref] , and are essential to the study of the QCD phase diagram for multiple reasons.

Off-diagonal correlators of conserved charges from lattice QCD and how to relate them to experiment · Introduction · 0.85

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