scholarly journals Hadronic phase space density and chiral symmetry restoration in relativistic heavy ion collisions

1999 ◽  
Vol 59 (6) ◽  
pp. 3304-3308 ◽  
Author(s):  
Scott Pratt ◽  
Kevin Haglin
Keyword(s):  
Phase Space ◽  
Chiral Symmetry ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Phase Space Density ◽  
Chiral Symmetry Restoration ◽  
Space Density ◽  
Hadronic Phase ◽  
Ion Collisions

scholarly journals Phase-space density in heavy-ion collisions revisited

2003 ◽  
Vol 30 (4) ◽  
pp. 517-523 ◽  
Author(s):  
Q. H. Zhang ◽  
J. Barrette ◽  
C. Gale
Keyword(s):  
Phase Space ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Phase Space Density ◽  
Space Density ◽  
Ion Collisions

scholarly journals Φ-MEASURE OF PIONS IN HIGH ENERGY HEAVY-ION COLLISIONS

2002 ◽  
Vol 17 (01) ◽  
pp. 109-122 ◽  
Author(s):  
Q. H. ZHANG
Keyword(s):  
Phase Space ◽  
Quantum Correlation ◽  
Heavy Ion Collisions ◽  
Great Influence ◽  
Heavy Ion ◽  
High Energy ◽  
Phase Space Density ◽  
Dynamical Correlation ◽  
Space Density ◽  
Ion Collisions

Event-by-event fluctuations for high energy heavy-ion collisions are investigated. The Φ-measures are calculated for pions. It is found that multiparticle symmetrization correlation has great influence on the value of Φ if the phase space density is high. Previous derivation of Φ-measure has neglected multiparticle quantum correlation. So the explanation of Φ-measure as a measure of dynamical correlation is reasonable only when multiparticles quantum correlation effects are smaller. We argue that the Φ-measure might be applicable at the SPS energy where the pion phase space density is much less than one.

scholarly journals Signatures of chiral symmetry restoration and its survival throughout the hadronic phase interactions

2018 ◽  
Vol 171 ◽  
pp. 02004
Author(s):  
E.L. Bratkovskaya ◽  
P. Moreau ◽  
A. Palmese ◽  
W. Cassing ◽  
E. Seifert ◽  
...  
Keyword(s):  
Chiral Symmetry ◽  
Heavy Ion Collisions ◽  
Particle Production ◽  
Heavy Ion ◽  
Transverse Mass ◽  
Chiral Symmetry Restoration ◽  
Hadronic Phase ◽  
Ion Collisions ◽  
Particle Ratio ◽  
Pion Nucleon

The effect of the chiral symmetry restoration (CSR) on observables from heavy-ion collisions is studied in the energy range [see formula in PDF]=3–20 GeV within the Parton-Hadron-String Dynamics (PHSD) transport approach. The PHSD includes the deconfinement phase transition as well as essential aspects of CSR in the dense and hot hadronic medium, which are incorporated in the Schwinger mechanism for the hadronic particle production. We adopt different parametrizations of the nuclear equation of state from the non-linear σ - ω model, which enter in the computation of the quark scalar density for the CSR mechanism, in order to estimate the uncertainty in our calculations. For the pion-nucleon ∑-term we adopt ∑π ≈ 45 MeV which corresponds to a ’world average’. Our systematic studies show that chiral symmetry restoration plays a crucial role in the description of heavy-ion collisions at [see formula in PDF]=3–20 GeV, realizing an increase of the hadronic particle production in the strangeness sector with respect to the non-strange one. We identify particle abundances and rapidity spectra to be suitable probes in order to extract information about CSR, while transverse mass spectra are less sensitive ones. Our results provide a microscopic explanation for the "horn" structure in the excitation function of the K+/π+ ratio: the CSR in the hadronic phase produces the steep increase of this particle ratio up to [see formula in PDF] ≈ 7 GeV, while the drop at higher energies is associated to the appearance of a deconfined partonic medium.

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