Chemical equilibration of strangeness

Sollfrank, Josef

doi:10.1088/0954-3899/23/12/015

Cited by 67 publications

(91 citation statements)

References 79 publications

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“…The SSBM analysis for the S+S interaction [15] has shown that this equilibrated state is situated mostly (75%) outside the hadronic phase, whereas the S+Ag [21] is just on the deconfinement line. In addition, the calculations have pointed out a large (∼30%) entropy enhancement of the experimental data compared to the model, an effect observed also by other calculations [23][24][25]. This enhancement may be attributed to contributions from the DQM phase with many liberated new partonic degrees of freedom.…”

Section: Experimental Datasupporting

confidence: 54%

The strange-quark chemical potential as an experimentally accessible order parameter of the deconfinement phase transition for finite baryon density

Panagiotou¹,

Katsas²

2003

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

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Abstract.We consider the change of the strange-quark chemical potential in the phase diagram of nuclear matter, employing the Wilson loop and scalar quark condensate order parameters, mass-scaled partition functions and enforcing flavor conservation. Assuming the region beyond the hadronic phase to be described by massive, correlated and interacting quarks, in the spirit of lattice and effective QCD calculations, we find the strange-quark chemical potential to change sign: from positive in the hadronic phase -to zero upon deconfinement -to negative in the partonic domain. We propose this change in the sign of the strange-quark chemical potential to be an experimentally accessible order parameter and a unique, concise and well-defined indication of the quark-deconfinement phase transition in nuclear matter.

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Section: Experimental Datasupporting

confidence: 54%

The strange-quark chemical potential as an experimentally accessible order parameter of the deconfinement phase transition for finite baryon density

Panagiotou¹,

Katsas²

2003

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

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“…Several prior attempts have been made to interpret the hadronic particle abundances and spectra within statistical particle production interpretation [2,3,4,5,6,7,8,9], and the present report takes, as we believe it, to a conclusion this extensive body of research work. The result of our present analysis are the parameters and properties of the hadronic system at chemical freeze-out.…”

Section: Introductionmentioning

confidence: 68%

Chemical nonequilibrium and deconfinement in 200AGeV sulphur induced reactions

Letessier

Rafelski

1999

Phys. Rev. C

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We interpret hadronic particle abundances produced in S-Au/W/Pb 200 A GeV reactions in terms of the final state hadronic phase space model and determine by a data fit of the chemical hadron freeze-out parameters. Allowing for the flavor abundance non-equilibrium a highly significant fit to experimental particle abundance data emerges, which supports possibility of strangeness distillation. We find under different strategies stable values for freeze-out temperature T f = 143 ± 3 MeV, baryochemical potential µ B = 173 ± 6 MeV, ratio of strangeness (γ s ) and light quark (γ q ) phase space occupancies γ s /γ q = 0.60 ± 0.02, and γ q = 1.22 ± 0.05 without accounting for collective expansion (radial flow). When introducing flow effects which allow a consistent description of the transverse mass particle spectra, yielding | v c | = 0.49 ± 0.01 c, we find γ s /γ q = 0.69 ± 0.03 , γ q = 1.41 ± 0.08. The strange quark fugacity is fitted at λ s = 1.00 ± 0.02 suggesting chemical freeze-out directly from the deconfined phase.

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“…G(s, m a , m b ) vanishes at threshold, so that one recovers the tree-level amplitude, and becomes progressively larger with the increase of s, causing an effective suppression of the coupling constant g. At large s, our simple expression shall become inaccurate compared with the solution of the full BS equation with couple-channels effects incorporated, but one should bare in mind that high values of s are exponentially suppressed in the integral that defines the collision rates in Eq. (29). Therefore, this inaccuracy has a small numerical impact in the determination of the collision rates, but is important to avoid artificially large contributions from cross section values above the unitarity limit.…”

Section: B Binary Reactionsmentioning

confidence: 99%

“…The underlying idea is that the equation of state of a gas of free hadrons and resonances should mimic the one of a dense hadron gas [29]. Fig.…”

Section: Time Evolutionmentioning

confidence: 99%

φmeson propagation in a hot hadronic gas

Alvarez‐Ruso

Koch

2002

Phys. Rev. C

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The Hidden Local Symmetry Lagrangian is used to study the interactions of φ mesons with other pseudoscalar and vector mesons in a hadronic gas at finite temperature. We have found a significantly small φ mean free path (less than 2.4 fm at T > 170 MeV) due to large collision rates with ρ mesons, kaons and predominantly K * in spite of their heavy mass. This implies that φ mesons produced after hadronization in relativistic heavy ion collisions will not leave the hadronic system without scattering. The effect of these interactions on the time evolution of the φ density in the expanding hadronic fireball is investigated.

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Chemical equilibration of strangeness

Cited by 67 publications

References 79 publications

The strange-quark chemical potential as an experimentally accessible order parameter of the deconfinement phase transition for finite baryon density

The strange-quark chemical potential as an experimentally accessible order parameter of the deconfinement phase transition for finite baryon density

Chemical nonequilibrium and deconfinement in 200AGeV sulphur induced reactions

φmeson propagation in a hot hadronic gas

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