Significance of temperature measurements in relativistic nuclear collisions

Stöcker, H.; Ogloblin, A. A.; Greiner, Walter

doi:10.1007/bf01421522

Cited by 106 publications

(75 citation statements)

References 22 publications

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“…We should mention that pion spectra like the ones now measured have been predicted earlier as a signal for the formation of abnormal nuclear matter [6]. They have also been predicted as a manifestation of the cooling of the expanding system [7] in the context of ultrarelativistic collisions.…”

Section: Introductionsupporting

confidence: 71%

Pion spectra in equilibrium models of nuclear collisions

Hahn

1988

Phys. Rev. C

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Section: Introductionsupporting

confidence: 71%

Pion spectra in equilibrium models of nuclear collisions

Hahn

1988

Phys. Rev. C

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“…The conjecture of the tricritical point [21] was put forward in this context. The importance of measurements at very high energies to obtain information on the existence of a limiting temperature of excited hadronic matter produced in nuclear collisions was pointed out early [22,23,24,25] based on analysis of particle spectra at the Bevalac (see also the review [26]), from pions to heavier complex nuclei.…”

Section: Introductionmentioning

confidence: 99%

Production of light nuclei, hypernuclei and their antiparticles in relativistic nuclear collisions

et al. 2011

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“…Thermodynamic models are valuable tools in the modern-day high energy physics, and have long been employed to estimate the temperatures reached in the relativistic heavy-ion collisions [1][2][3]. The hadronresonance gas model and its modifications have been rather successfully used to extract the chemical freezeout properties of matter created in heavy-ion collisions, by fitting the rich data on mean hadron multiplicities in various experiments, ranging from the low energies at Bevalac and SchwerIonen-Synchrotron (SIS) to the highest energy of the Large Hadron Collider (LHC) at CERN [4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Surprisingly large uncertainties in temperature extraction from thermal fits to hadron yield data at LHC

Vovchenko

Stoecker

2017

J. Phys. G: Nucl. Part. Phys.

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The conventional hadron-resonance gas (HRG) model with the Particle Data Group (PDG) hadron input, full chemical equilibrium, and the hadron type dependent eigenvolume interactions is employed to fit the hadron mid-rapidity yield data of ALICE Collaboration for the most central Pb+Pb collisions. For the case of point-like hadrons the well-known fit result T = 154 ± 2 MeV is reproduced. However, the situation changes if hadrons have different eigenvolumes. In the case when all mesons are point-like while all baryons have an effective hard-core radius of 0.3 fm the χ 2 temperature dependence of the χ 2 has a broad minimum in the temperature range of 155 − 210 MeV, with fit quality comparable to the T ∼ 155 MeV minimum in the point-particle case. Very similar result is obtained when only baryon-baryon eigenvolume interactions are considered, with eigenvolume parameter taken from previous fit to ground state of nuclear matter. Finally, when we apply the eigenvolume corrections with mass-proportional eigenvolume vi ∼ mi, fixed to particular proton hard-core radius rp, we observe a second minimum in the temperature dependence of the χ 2 , located at the significantly higher temperatures. For instance, at rp = 0.5 fm the fit quality is better than in the point-particle HRG case in a very wide temperature range of 170 − 320 MeV, which gives an uncertainty in the temperature determination from the fit to the data of 150 MeV. These results show that thermal fits to the heavy-ion hadron yield data are very sensitive to the modeling of the short-range repulsion eigenvolume between hadrons, and that chemical freeze-out temperature can be extracted from the LHC hadron yield data only with sizable uncertainty.

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Significance of temperature measurements in relativistic nuclear collisions

Cited by 106 publications

References 22 publications

Pion spectra in equilibrium models of nuclear collisions

Pion spectra in equilibrium models of nuclear collisions

Production of light nuclei, hypernuclei and their antiparticles in relativistic nuclear collisions

Surprisingly large uncertainties in temperature extraction from thermal fits to hadron yield data at LHC

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