Resonance states in an effective chiral hadronic model

Rau, Philip; Steinheimer, Jan; Schramm, Stefan; Stöcker, H.

doi:10.2478/s11534-012-0039-6

Cited by 4 publications

(24 citation statements)

References 25 publications

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“…As already pointed out in Ref. [43], a slower decrease of σ, as it is observed in the lattice data, can be achieved by taking into account pionic self interactions [88][89][90]. Nevertheless, as predicted by all lattice QCD calculations, the transition is a smooth cross-over for both order parameters.…”

Section: Model Propertiesmentioning

confidence: 54%

“…As found in Ref. [43], the inclusion of all known hadronic degrees of freedom in a σ-ω model restricts the chiral phase transition to a smooth cross-over in the whole T -µ plane. Nevertheless, the first-order liquid-gas phase transition for nuclear matter at the ground state up to a critical end-point T c ≈ 15 MeV stays For the two scenarios including the quark phase, the non-interacting scenario (green line) and the interacting scenario (blue line), Φ only shows rather small differences below the critical temperature Tc ≈ 170 MeV.…”

Section: Model Propertiesmentioning

confidence: 73%

“…Ref. [43] demonstrates the impact of baryonic resonance states on the phase diagram. This was essentially done by varying the vector coupling strength (change the value of r v , which effectively controls the abundance of particles at finite baryochemical potentials in the model).…”

Section: Model Approachmentioning

confidence: 99%

“…forward two parameter ansatz is chosen [43]. This approach avoids having multiple different coupling parameters for every single resonance state or SU(3) multiplets.…”

Section: Model Approachmentioning

confidence: 99%

“…In this paper, such a model is presented including all known hadronic degrees of freedom [41][42][43][44] as well as a quark phase for the description of highly excited matter. With this model, it is possible to study the QCD phase diagram with a particular focus on the phase transitions.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Chiral hadronic mean field model including quark degrees of freedom

Rau¹,

Steinheimer²,

Schramm³

et al. 2013

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

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Abstract. In an approach inspired by Polyakov loop extended NJL models, we present a nonlinear hadronic SU(3) σ-ω mean field model augmented by quark degrees of freedom. By introducing the effective Polyakov loop related scalar field Φ and an associated effective potential, the model includes all known hadronic degrees of freedom at low temperatures and densities as well as a quark phase at high temperatures and densities. Hadrons in the model exhibit a finite volume in order to suppress baryons at high T and µ This ensures that the right asymptotic degrees of freedom are attained for the description of strongly interacting matter and allows to study the QCD phase diagram in a wide range of temperatures and chemical potentials. Therefore, with this model it is possible to study the phase transition of chiral restoration and deconfinement. In this paper, the impact of quarks on the resulting phase diagram is shown. The results from the chiral model are compared to recent data from lattice QCD.

show abstract

Section: Model Propertiesmentioning

confidence: 54%

Section: Model Propertiesmentioning

confidence: 73%

Section: Model Approachmentioning

confidence: 99%

“…forward two parameter ansatz is chosen [43]. This approach avoids having multiple different coupling parameters for every single resonance state or SU(3) multiplets.…”

Section: Model Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Chiral hadronic mean field model including quark degrees of freedom

Rau¹,

Steinheimer²,

Schramm³

et al. 2013

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

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show abstract

Conserved charge fluctuations in a chiral hadronic model including hadrons and quarks

Rau¹,

Steinheimer²,

Schramm³

et al. 2014

Physics Letters B

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In this work the baryon number and strange susceptibility of second and fourth order are presented. The results at zero baryonchemical potential are obtained using a well tested chiral effective model including all known hadron degrees of freedom and additionally implementing quarks and gluons in a PNJL-like approach. Quark and baryon number susceptibilities are sensitive to the fundamental degrees of freedom in the model and signal the shift from massive hadrons to light quarks at the deconfinement transition by a sharp rise at the critical temperature. Furthermore, all susceptibilities are found to be largely suppressed by repulsive vector field interactions of the particles. In the hadronic sector vector repulsion of baryon resonances restrains fluctuations to a large amount and in the quark sector above T c even small vector field interactions of quarks quench all fluctuations unreasonably strong. For this reason, vector field interactions for quarks have to vanish in the deconfinement limit.

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Chiral Hadronic Mean Field Model including Quark Degrees of Freedom

Rau,

Steinheimer,

Schramm

et al. 2013

Preprint

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In an approach inspired by Polyakov loop extended NJL models, we present a nonlinear hadronic SU(3) σ-ω mean field model augmented by quark degrees of freedom. By introducing the effective Polyakov loop related scalar field Φ and an associated effective potential, the model includes all known hadronic degrees of freedom at low temperatures and densities as well as a quark phase at high temperatures and densities. Hadrons in the model exhibit a finite volume in order to suppress baryons at high T and µ This ensures that the right asymptotic degrees of freedom are attained for the description of strongly interacting matter and allows to study the QCD phase diagram in a wide range of temperatures and chemical potentials. Therefore, with this model it is possible to study the phase transition of chiral restoration and deconfinement. In this paper, the impact of quarks on the resulting phase diagram is shown. The results from the chiral model are compared to recent data from lattice QCD.

show abstract

Resonance states in an effective chiral hadronic model

Cited by 4 publications

References 25 publications

Chiral hadronic mean field model including quark degrees of freedom

Chiral hadronic mean field model including quark degrees of freedom

Conserved charge fluctuations in a chiral hadronic model including hadrons and quarks

Chiral Hadronic Mean Field Model including Quark Degrees of Freedom

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