Light baryons below and above the deconfinement transition: medium effects and parity doubling

Abstract

We study what happens to the Nucleon, Delta and Omega baryons in the hadronic gas and the quark-gluon plasma, with particular interest in parity doubling and its emergence as the plasma is heated. This is done using simulations of lattice QCD, employing the FASTSUM anisotropic Nf=2+1 ensembles, with four temperatures below and four above the deconfinement transition temperature. Below Tc we find that the positive-parity groundstate masses are largely temperature independent, whereas the negative-parity ones are reduced considerably as the temperature increases. This may be of interest for heavy-ion phenomenology. Close to the transition, the masses are nearly degenerate, in line with the expectation from chiral symmetry restoration. Above Tc we find a clear signal of parity doubling in all three channels, with the effect of the heavier s quark visible.

arXiv comment33 pages, several figures; additional evidence on the absence of light baryonic bound states in the QGP provided, references added, to appear in JHEP

References in corpus (34)

• The Chroma Software System for Lattice QCD
• Ab-initio Determination of Light Hadron Masses
• Heavy-flavour and quarkonium production in the LHC era: from proton-proton to heavy-ion collisions
• Maximum Entropy Analysis of the Spectral Functions in Lattice QCD
• $J/\psi$ and ${\eta }_c$ in the Deconfined Plasma from Lattice QCD
• Behavior of Charmonium Systems after Deconfinement
• Properties of hot and dense matter from relativistic heavy ion collisions
• Observation of sequential Upsilon suppression in PbPb collisions
• Spectral functions at small energies and the electrical conductivity in hot, quenched lattice QCD
• Electrical conductivity of the quark-gluon plasma across the deconfinement transition
• Confronting LHC data with the statistical hadronization model
• Electrical conductivity and charge diffusion in thermal QCD from the lattice
• Charmonium at finite temperature in quenched lattice QCD
• Transport coefficients, spectral functions and the lattice
• What happens to the Upsilon and eta_b in the quark-gluon plasma? Bottomonium spectral functions from lattice QCD
• Continuum and lattice meson spectral functions at nonzero momentum and high temperature
• Meson screening masses from lattice QCD with two light and the strange quark
• Cold, dense nuclear matter in a SU(2) parity doublet model
• Heavy-flavor production and medium properties in high-energy nuclear collisions - What next?
• The bottomonium spectrum at finite temperature from $N_f=2+1$ lattice QCD
• Infinite temperature limit of meson spectral functions calculated on the lattice
• Suppression of ${\rm Y}$(1S) at forward rapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Chiral Symmetry for Positive and Negative Parity Nucleons
• Heavy-ion collisions at the Large Hadron Collider: a review of the results from Run 1
• Melting of P wave bottomonium states in the quark-gluon plasma from lattice NRQCD
• Measurement of ${\rm Y}$(1S+2S+3S) production in $p$$+$$p$ and Au$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Charmonium spectral functions from 2+1 flavour lattice QCD
• Baryon Spectroscopy in Lattice QCD
• Properties of hadron screening masses at small baryonic density
• Decays of 1/2^- Baryons in Chiral Effective Theory
• A relation between screening masses and real-time rates
• Nucleons near the QCD deconfinement transition
• Massive Yang-Mills for Vector and Axial-Vector Spectral Functions at Finite Temperature
• Parity doubling of nucleons, Delta and Omega baryons across the deconfinement phase transition

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• Quark-hadron crossover equations of state for neutron stars: constraining the chiral invariant mass in a parity doublet model
• Magnetized baryons and the QCD phase diagram: NJL model meets the lattice
• Structure of the nucleon's low-lying excitations
• First-order phase transition from hypernuclear matter to deconfined quark matter obeying new constraints from compact star observations
• The application of the Quark-Hadron Chiral Parity-Doublet Model to neutron star matter
• Probing neutron-star matter in the lab: similarities and differences between binary mergers and heavy-ion collisions
• Constraint to chiral invariant masses of nucleons from GW170817 in an extended parity doublet model
• Chiral and $U(1{)}_A$ restoration for the scalar/pseudoscalar meson nonets
• Chiral spin symmetry and the QCD phase diagram
• Toward a unified equation of state for multi-messenger astronomy
• Parity Doubling and the Dense Matter Phase Diagram under Constraints from Multi-Messenger Astronomy
• Net-baryon number fluctuations in the Hybrid Quark-Meson-Nucleon model at finite density
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• Chiral condensates for neutron stars in hadron-quark crossover: from a parity doublet nucleon model to an NJL quark model
• Chiral partner structure of light nucleons in an extended parity doublet model
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• Delta mass shift as a thermometer of kinetic decoupling in Au+Au reactions at 1.23 AGeV
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• Medium effects and parity doubling of hyperons across the deconfinement phase transition
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• van der Waals Interactions and Hadron Resonance Gas: Role of resonance widths modeling on conserved charges fluctuations
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• Baryon and meson masses in the Nambu--Jona-Lasinio model: A Bayesian approach
• Chiral, parity-doublet, effective-Lagrangian mean-field theories for nuclear and astrophysical phenomenology
• Renormalization-Group Invariant Parity-Doublet Model for Nuclear and Neutron-Star Matter
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• Parity-doubled nucleons can rapidly cool neutron stars