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

Gert Aarts, Chris Allton, Davide De Boni, Simon Hands, Benjamin Jaeger, Chrisanthi Praki, Jon-Ivar Skullerud

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Resumé

At zero temperature the negative-parity ground states of the nucleon and delta baryons are non-degenerate 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 $\Delta$ (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.
OriginalsprogEngelsk
TidsskriftP o S - Proceedings of Science
Vol/bind256
ISSN1824-8039
DOI
StatusUdgivet - 24. okt. 2016
Udgivet eksterntJa

Fingeraftryk

nucleons
baryons
parity
quarks
maximum entropy method
ground state
symmetry
sectors
quantum chromodynamics
temperature

Citer dette

Aarts, Gert ; Allton, Chris ; Boni, Davide De ; Hands, Simon ; Jaeger, Benjamin ; Praki, Chrisanthi ; Skullerud, Jon-Ivar. / Parity doubling of nucleons and Delta baryons across the deconfinement phase transition. I: P o S - Proceedings of Science. 2016 ; Bind 256.
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title = "Parity doubling of nucleons and Delta baryons across the deconfinement phase transition",
abstract = "At zero temperature the negative-parity ground states of the nucleon and delta baryons are non-degenerate 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 $\Delta$ (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.",
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author = "Gert Aarts and Chris Allton and Boni, {Davide De} and Simon Hands and Benjamin Jaeger and Chrisanthi Praki and Jon-Ivar Skullerud",
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Parity doubling of nucleons and Delta baryons across the deconfinement phase transition. / Aarts, Gert; Allton, Chris; Boni, Davide De; Hands, Simon; Jaeger, Benjamin; Praki, Chrisanthi; Skullerud, Jon-Ivar.

I: P o S - Proceedings of Science, Bind 256, 24.10.2016.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Parity doubling of nucleons and Delta baryons across the deconfinement phase transition

AU - Aarts, Gert

AU - Allton, Chris

AU - Boni, Davide De

AU - Hands, Simon

AU - Jaeger, Benjamin

AU - Praki, Chrisanthi

AU - Skullerud, Jon-Ivar

N1 - 7 pages, 3 figures. Talk presented at the 34th International Symposium on Lattice Field Theory (Lattice 2016), 24-30 July 2016, Southampton, UK

PY - 2016/10/24

Y1 - 2016/10/24

N2 - At zero temperature the negative-parity ground states of the nucleon and delta baryons are non-degenerate 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 $\Delta$ (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.

AB - At zero temperature the negative-parity ground states of the nucleon and delta baryons are non-degenerate 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 $\Delta$ (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.

KW - hep-lat

U2 - 10.22323/1.256.0037

DO - 10.22323/1.256.0037

M3 - Journal article

VL - 256

JO - P o S - Proceedings of Science

JF - P o S - Proceedings of Science

SN - 1824-8039

ER -