Possible signals of two QCD phase transitions at NICA-FAIR energies

Bugaev, K. A.; Ivanytskyi, O.; Sagun, V. V.; Grinyuk, B. E.; Savchenko, Denys; Zinovjev, G.; Nikonov, E. G.; Bravina, L.; Zabrodin, E. E.; Blaschke, D.; Kabana, S.; Taranenko, A.

doi:10.1051/epjconf/201920403001

Cited by 9 publications

(6 citation statements)

References 28 publications

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“…Indeed, using just two extra parameters, the hard-core radii of pions R π and kaons R K , in addition to the hard-core radii of baryons R b and the ones of other mesons R m which are traditionally employed in the HRGM, it was possible to achieve a very accurate description of all independent hadron multiplicity ratios measured prior to the LHC era with a χ 2 /dof which is in the range between 1.15 [15,16,17] and 0.96 [18]. The high accuracy achieved by the HRGM with multicomponent hard-core repulsion allowed us not only to elucidate the characteristics of the CFO of A+A collisions, but also to reveal new irregularities of thermodynamic quantities at the CFO and to formulate new signals of two phase transitions [19,20,21,22,23] which are expected to exist in strongly interacting matter.…”

Section: Introductionmentioning

confidence: 99%

Second virial coefficients of light nuclear clusters and their chemical freeze-out in nuclear collisions

Bugaev,

Vitiuk,

Grinyuk

et al. 2020

Preprint

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Here we develop a new strategy to analyze the chemical freeze-out of light (anti)nuclei produced in high energy collisions of heavy atomic nuclei within an advanced version of the hadron resonance gas model. It is based on two different, but complementary approaches to model the hard-core repulsion between the light nuclei and hadrons. The first approach is based on an approximate treatment of the equivalent hard-core radius of a roomy nuclear cluster and pions, while the second approach is rigorously derived here using a self-consistent treatment of classical excluded volumes of light (anti)nuclei and hadrons. By construction, in a hadronic medium dominated by pions, both approaches should give the same results. Employing this strategy to the analysis of hadronic and light (anti)nuclei multiplicities measured by ALICE at √ sNN = 2.76 TeV and by STAR at √ sNN = 200 GeV, we got rid of the existing ambiguity in the description of light (anti)nuclei data and determined the chemical freeze-out parameters of nuclei with high accuracy and confidence. At ALICE energy the nuclei are frozen prior to the hadrons at the temperature T = 175.1 +2.3 −3.9 , while at STAR energy there is a single freeze-out of hadrons and nuclei at the temperature T = 167.2 ± 3.9 MeV. We argue that the found chemical freeze-out volumes of nuclei can be considered as the volumes of quark-gluon bags that produce the nuclei at the moment of hadronization.

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Section: Introductionmentioning

confidence: 99%

Second virial coefficients of light nuclear clusters and their chemical freeze-out in nuclear collisions

Bugaev,

Vitiuk,

Grinyuk

et al. 2020

Preprint

Self Cite

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“…Conditions similar to the early universe can be recreated in the laboratory conditions in large-scale ultrarelativistic a e-mail: jyilmazkaya@kocaeli.edu.tr (corresponding author) heavy-ion collision experiments and the data obtained is crucial for modeling the hot-dense matter [6]. Searching the form of QCD phase diagram and fixing the region of phase transition from the hadronic matter to the QGP state at high temperatures are the main objectives of current and planned experimental programs at the RHIC in Brookhaven National Laboratory and future experiments at the FAIR facility in Darmstadt and NICA in Dubna [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Axial-tensor Meson family at $$T\ne 0$$

Süngü¹,

Türkan²,

Sertbakan³

et al. 2020

Eur. Phys. J. C

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The mass and decay constants of $$\rho _2,~\omega _2$$ ρ 2 , ω 2 and a missing member in the $$ 2^{--} $$ 2 - - nonet along with their first excited states are analyzed by the Thermal QCD sum rules approach, including QCD condensates up to dimension five. Mass and decay constant values of these mesons are stable from $$T=0$$ T = 0 up to $$T \cong 120 ~\mathrm {MeV}$$ T ≅ 120 MeV . However, after this threshold point, our numerical analyses indicates that they begin to diminish with increasing temperature. When we compare the hadronic parameters with their vacuum values, masses of these mesons and their first excited states decrease between (1–13%) from the PDG data and (10–26%) for the decay constants. However they diminish in the interval of (9–26%) and (2–34%) respectively with regards to Regge Trajectory Model data. We expect our numerical results will be confirmed by future heavy-ion collision experiments.

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“…The conditions similar to the early Universe can be recreated in the laboratory, in large-scale ultra-relativistic heavy-ion collision experiments and their results can provide us fundamental characteristics of QCD at finite temperature and is a crucial data for modeling the hot-dense matter [6]. Searching the form of the phase diagram of QCD and fixing the region of phase transition from the hadronic matter to the QGP state at high temperatures are main objectives of current and planned experimental programs at the RHIC in Brookhaven National Laboratory and future experiments at the FAIR facility in Darmstadt and NICA in Dubna [7,8,9].…”

Section: Introductionmentioning

confidence: 99%

Axial-tensor Meson Family at $T\neq0$

Süngü,

Türkan,

Sertbakan

et al. 2020

Preprint

View full text Add to dashboard Cite

The mass and decay constant of the axial-tensor meson nonets ρ2, ω2 and a missing member and also their first excited states are analyzed by the Thermal QCD sum rules model including QCD condensates up to dimension five. Mass and decay constant values in terms of variations of temperature are very well stable from T = 0 up to T ∼ = 120 MeV. However nearly after these threshold, our numerical analysis indicate that they begin to diminish with increasing temperature. Mass value of these mesons and their first excited states decrease about (1 − 13%) compared to vacuum values and (10 − 26%) for the decay constants according to PDG data and (9 − 26%) and (2 − 34%) respectively concerning Regge Trajectory Model in the corresponding Thermal QCD sum rules calculations. The experimental results are already copious, but expected to grow up at ongoing and future heavy-ion experimental programs allowing us to compare our results.

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Possible signals of two QCD phase transitions at NICA-FAIR energies

Cited by 9 publications

References 28 publications

Second virial coefficients of light nuclear clusters and their chemical freeze-out in nuclear collisions

Second virial coefficients of light nuclear clusters and their chemical freeze-out in nuclear collisions

Axial-tensor Meson family at $$T\ne 0$$

Axial-tensor Meson Family at $T\neq0$

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