Nucleons near the QCD deconfinement transition

It is expected that nucleons and their parity partners become degenerate when chiral symmetry is restored. We investigate this question in the context of the thermal transition from the hadronic phase to the quark-gluon plasma, using lattice QCD simulations with N f ¼ 2 þ 1 flavors. We observe a clear sign of parity doubling in the quark-gluon plasma. Besides, we find that the nucleon ground state is, within the uncertainty, largely independent of the temperature, whereas temperature effects are substantial in the negative-parity (N Ã ) channel, already in the confined phase.

show abstract

“…To investigate parity doubling in more detail also above T c , we consider the following ratio of correlation functions [10]:…”

Section: Resultsmentioning

confidence: 99%

“…[10], where it was studied at three temperatures in quenched lattice QCD. In this paper we present what is, as far as we know, the first study of nucleons at finite temperature in lattice QCD with N f ¼ 2 þ 1 dynamical quarks, for a range of temperatures below and above the deconfinement transition.…”

Section: Introductionmentioning

confidence: 99%

Nucleons and parity doubling across the deconfinement transition

et al. 2015

View full text Add to dashboard Cite

show abstract

“…As the temperature the correlation function regains more and more of its reflection symmetry around t T = 1/2, which indicates the emergence of parity doubling in the quark-gluon plasma. To quantify this further, we look at a weighted average of ratios of correlation functions [3],…”

Section: Resultsmentioning

confidence: 99%

Finite Temperature Lattice QCD --- Baryons in the Quark--Gluon Plasma

Aarts¹,

Allton²,

Boni³

et al. 2016

Acta Phys. Pol. B Proc. Suppl.

View full text Add to dashboard Cite

Baryonic correlation functions provide an ideal tool to study parity doubling and chiral symmetry using lattice simulations. We present a study using 2 + 1 flavors of anisotropic Wilson clover fermions on the FAST-SUM ensembles and find clear evidence that parity doubling emerges in the quark-gluon plasma. This result is confirmed on the level of spectral functions, which are obtained using a MEM reconstruction. We further highlight the importance of Gaussian smearing in this study.

show abstract

“…One then would expect that a consequence of the restoration of chiral symmetry is parity doubling. While there are studies of chiral symmetry at finite temperature in the mesonic sector [1], surprisingly only a few quenched analyses are available in the baryonic sector [2,3,4]. This work aims to study parity doubling in the unquenched baryonic sector, in particular for the nucleon and the ∆ particle.…”

Section: Introductionmentioning

confidence: 99%

Parity doubling of nucleons and Delta baryons across the deconfinement phase transition

Boni¹,

Aarts²,

Allton³

et al. 2017

Proceedings of 34th Annual International Symposium on Lattice Field Theory — PoS(LATTICE2016)

View full text Add to dashboard Cite

At zero temperature the negative-parity ground states of the nucleon and delta baryons are nondegenerate with the positive-parity partners due to spontaneous breaking of chiral symmetry. However, chiral symmetry is expected to be restored at sufficiently high temperature, in particular when going from the hadronic to the quark-gluon plasma (QGP) phase. This would imply that channels with opposite parity become degenerate. We study the nucleon (spin 1/2) and ∆ (spin 3/2) baryons in both parity sectors using lattice QCD. The range of temperatures spans both the hadronic and QGP phases. Using the FASTSUM anisotropic N f = 2 + 1 ensembles, we analyze the correlation functions and the spectral functions using respectively exponential fits and the Maximum Entropy Method. We find clear evidence of in-medium effects in the hadronic phase, especially for the negative-parity ground state, and of parity doubling in the QGP phase.34th annual International Symposium on Lattice Field Theory

show abstract

Nucleons near the QCD deconfinement transition

Cited by 28 publications

References 40 publications

Nucleons and parity doubling across the deconfinement transition

Nucleons and parity doubling across the deconfinement transition

Finite Temperature Lattice QCD --- Baryons in the Quark--Gluon Plasma

Parity doubling of nucleons and Delta baryons across the deconfinement phase transition

Contact Info

Product

Resources

About