Strange-quark matter within the Nambu-Jona-Lasinio model

Mishustin, I. N.; Satarov, L. M.; Stöcker, H.; Greiner, Walter

doi:10.1134/1.1378870

Cited by 16 publications

(14 citation statements)

References 26 publications

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“…In other words, the temperature of the HP at λ = 1 is higher than the temperature of the QP at λ = 0. Such a picture differs from the predictions of the linear σ model and the Nambu-Jona-Lasinio model [5,41] for the chiral first order phase transition. There temperature drops in the MP.…”

Section: Adiabatic Trajectoriescontrasting

confidence: 77%

Equation of state of hadron resonance gas and the phase diagram of strongly interacting matter

2009

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The equation of state of hadron resonance gas at finite temperature and baryon density is calculated taking into account finite-size effects within the excluded volume model. Contributions of known hadrons with masses up to 2 GeV are included in the zero-width approximation. Special attention is paid to the role of strange hadrons in the system with zero total strangeness. A densitydependent mean field is added to guarantee that the nuclear matter has a saturation point and a liquid-gas phase transition. The deconfined phase is described by the bag model with lowest order perturbative corrections. The phase transition boundaries are found by using the Gibbs conditions with the strangeness neutrality constraint. The sensitivity of the phase diagram to the hadronic excluded volume and to the parametrization of the mean-field is investigated. The possibility of strangeness-antistrangeness separation in the mixed phase is analyzed. It is demonstrated that the peaks in the K/π and Λ/π excitation functions observed at low SPS energies can be explained by a nonmonotonous behavior of the strangeness fugacity along the chemical freeze-out line.

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Section: Adiabatic Trajectoriescontrasting

confidence: 77%

Equation of state of hadron resonance gas and the phase diagram of strongly interacting matter

2009

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“…The vector meson couplings are also discussed in Ref. [29]. Though these two models are quite different, the results are comparable to each other.…”

Section: Numerical Resultssupporting

confidence: 73%

“…If we assume that the strength of vector meson coupling is half of that in hadronic matter (in this case, the strength of vector coupling is comparable to the one of Ref. [29]), the maximum binding energy decreases. Inclusion of the additional term L h will forces the system to have a larger strangeness fraction and binding energy.…”

Section: Discussionmentioning

confidence: 99%

“…They found that while the double minimum version of the color dielectric model allowed the existence of strangelets, the single minimum version of this model excluded the possibility. Stability of strange quark matter was also investigated using the effective 4-quark interactions [28], the SU(3) Nambu-Jona-Lasinio (NJL) model with and without 4-quark vector type interactions [29,30]. In studying hadronic matter, we proposed a chiral SU(3) quark mean field model.…”

Section: Introductionmentioning

confidence: 99%

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Strange quark matter in a chiral SU(3) quark mean field model

et al. 2003

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We apply the chiral SU(3) quark mean field model to investigate strange quark matter. The stability of strange quark matter with different strangeness fraction is studied. The interaction between quarks and vector mesons destabilizes the strange quark matter. If the strength of the vector coupling is the same as in hadronic matter, strangelets can not be formed. For the case of β equilibrium, there is no strange quark matter which can be stable against hadron emission even without vector meson interactions.

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“…The properties and stability of strangelets have been discussed within the MIT bag model, a confined gas stabilized by the vacuum pressure B [4,[6][7][8][9]; more recent calculations, employing different quark models [10][11][12], pointed out that strangelet stability is strongly model dependent.…”

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confidence: 99%

The NJL model and strange-quark matter

Ratti

2003

Europhys. Lett.

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The stability of strange quark matter is studied within the Nambu JonaLasinio model with three different parameter sets. The model Lagrangian contains 4-fermion (with and without vector interaction) and 6-fermion terms; the minimum energy per baryon number as a function of the strangeness fraction of the system is compared to the masses of hyperons having the same strangeness fraction, and coherently calculated in the same version of the model, and for the same parameter set. The results show that in none of the different parameter sets strangelets are stable, and in some cases a minimum in the energy per baryon does not even exist.

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Strange-quark matter within the Nambu-Jona-Lasinio model

Cited by 16 publications

References 26 publications

Equation of state of hadron resonance gas and the phase diagram of strongly interacting matter

Equation of state of hadron resonance gas and the phase diagram of strongly interacting matter

Strange quark matter in a chiral SU(3) quark mean field model

The NJL model and strange-quark matter

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