Microscopic study of deuteron production in PbPb collisions at 
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 via hydrodynamics and a hadronic afterburner

Oliinychenko, Dmytro; Pang, Long-Gang; Elfner, Hannah; Koch, Volker

doi:10.1103/physrevc.99.044907

Cited by 118 publications

(110 citation statements)

References 52 publications

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“…The validity of the law of mass action for the strong π + d ↔ π + n + p reaction during the hadronic phase was recently illustrated in Ref. [40] in a microscopic transport model calculation, keeping the deuteron yield close to the thermal model value and echoing some earlier results based on the kinetic approach [41,42]. Further, the Saha equation approach implies that also the yields of hypernuclei stay virtually constant during the evolution after the chemical freeze-out and should be described by a thermal model calculation at T = T ch , in agreement with the available data on hypertriton production [2].…”

Section: Arxiv:190310024v2 [Hep-ph] 27 Nov 2019mentioning

confidence: 97%

Nucleosynthesis in heavy-ion collisions at the LHC via the Saha equation

et al. 2020

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The production of light (anti-)(hyper-)nuclei in heavy-ion collisions at the LHC is considered in the framework of the Saha equation, making use of the analogy between the evolution of the early universe after the Big Bang and that of "Little Bangs" created in the lab. Assuming that disintegration and regeneration reactions involving light nuclei proceed in relative chemical equilibrium after the chemical freeze-out of hadrons, their abundances are determined through the famous cosmological Saha equation of primordial nucleosynthesis and show no exponential dependence on the temperature typical for the thermal model. A quantitative analysis, performed using the hadron resonance gas model in partial chemical equilibrium, shows agreement with experimental data of the ALICE collaboration on d, 3 He, 3 Λ H, and 4 He yields for a very broad range of temperatures at T 155 MeV. The presented picture is supported by the observed suppression of resonance yields in central Pb-Pb collisions at the LHC.

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Section: Arxiv:190310024v2 [Hep-ph] 27 Nov 2019mentioning

confidence: 97%

Nucleosynthesis in heavy-ion collisions at the LHC via the Saha equation

et al. 2020

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“…This model knows only vacuum masses of these particles, entirely ignoring their small binding. To reconcile the data with codes, in literature [25] some so-far unobserved "resonances" were introduced, which have small sizes and "reasonable" destruction cross section, decaying into light nuclei after freezeout. The explanation we suggest is that one does not need such hypothetical resonances: their role is played by preclusters we study.…”

Section: Preclusters and Production Of Light Nucleimentioning

confidence: 99%

Baryon preclustering at the freeze-out of heavy-ion collisions and light-nuclei production

Shuryak

Torres-Rincón

2020

Phys. Rev. C

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Following the idea of nucleon clustering and light-nuclei production in relativistic heavy-ion collisions close to the QCD critical-end point, we address the quantum effects affecting the interaction of several nucleons at finite temperature. For this aim we use the K-harmonics method to 4-nucleon states (α particle), and also develop a novel semiclassical "flucton" method at finite temperature, based on certain classical paths in Euclidean time, and apply it to 2-and 4-particle configurations. To study possible effects on the light-nuclei production close to the QCD critical point, we also made such calculations with modified internuclear potentials. For heavy-ion experiments, we propose new measurements of light-nuclei multiplicity ratios which may show enhancements due to baryon preclustering. We point out the special role of the O(50) 4-nucleon excitations of α-particle, feeding into the final multiplicities of d, t, 3 He and 4 He, and propose to directly look for their 2-body decays.

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“…-The yields for recent Pb-Pb collisions at √ S NN = 2.76 − 5.02 TeV (where the subscript NN indicates per pair of colliding nucleons) measured at the Alice detector at the LHC are well-reproduced in the model with T cf = 156.5 ± 1.5 MeV, µ b = 0.7 ± 3.8 MeV and V cf = 5, 280 ± 410fm 3 for arXiv:1905.02753v2 [nucl-th] 29 May 2019 π ± , K ± ,K s 0 ,φ, p p, Λ, Λ, Ξ, Ξ, Ω − , Ω + , d, d, 3 He, 3 He, 3 Λ H, 3 Λ H, 4 He and 4 He [1]. (The yields of the Λ and Λ include the yields of the Σ 0 and Σ 0 , which decay electromagnetically into Λ and Λ respectively and cannot be separated experimentally.)…”

Section: Introductionmentioning

confidence: 89%

Yields of weakly bound light nuclei as a probe of the statistical hadronization model

et al. 2019

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The statistical hadronization model successfully describes the yields of hadrons and light nuclei from central heavy ion collisions over a wide range of energies. It is a simple and efficient phenomenological framework in which the relative yields for very high energy collisions are essentially determined by a single model parameter-the chemical freeze-out temperature. Recent measurements of yields of hadrons and light nuclei covering over 9 orders of magnitudes from the ALICE collaboration at the LHC were described by the model with remarkable accuracy with a chemical freeze-out temperature of 156.5 ± 1.5 MeV. A key physical question is whether (at least to a good approximation) the freeze-out temperature can be understood, literally, as the temperature at which the various species of an equilibrated gas of hadrons (including resonances) and nuclei chemically freeze out as the model assumes, or whether it successfully parametrizes the yield data for a different reason. This paper analyzes the yields of weakly-bound light nuclei-the deuteron and the hypertriton-to probe this issue. Such nuclei are particularly sensitive to assumptions of the model because their binding energies are at a scale far below both typical hadronic scales and the freeze-out temperature. The analysis depends only on outputs of the statistical hadronization model, known hadronic properties and standard assumptions of kinetic theory while making no additional dynamical assumptions about the dynamics of heavy ion collisions. The analysis indicates that a key assumption underlying the model-that hadrons (and nuclei), just prior to chemical freeze-out temperature, are in thermal equilibrium and are sufficiently dilute as to have particle distributions accurately described statistically by a nearly ideal gas of hadrons and nuclei with masses given by their free space values-appears to be inconsistent with the chemical freeze-out temperature output by the model, at least for these weakly-bound nuclei. Implications of this analysis for the interpretation of parameters extracted from the model are discussed.

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Microscopic study of deuteron production in PbPb collisions at s=2.76TeV via hydrodynamics and a hadronic afterburner

Cited by 118 publications

References 52 publications

Nucleosynthesis in heavy-ion collisions at the LHC via the Saha equation

Nucleosynthesis in heavy-ion collisions at the LHC via the Saha equation

Baryon preclustering at the freeze-out of heavy-ion collisions and light-nuclei production

Yields of weakly bound light nuclei as a probe of the statistical hadronization model

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