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Conference Paper/Proceeding/Abstract 817 views 77 downloads

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

Gert Aarts Orcid Logo

Proceedings of Science (Lattice 2016), Issue: 037

Swansea University Author: Gert Aarts Orcid Logo

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 f...

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Published in: Proceedings of Science (Lattice 2016)
Published: 2016
URI: https://cronfa.swan.ac.uk/Record/cronfa31610
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spelling 2017-05-16T13:36:04.7824547 v2 31610 2017-01-10 Parity doubling of nucleons and Delta baryons across the deconfinement phase transition 1ba0dad382dfe18348ec32fc65f3f3de 0000-0002-6038-3782 Gert Aarts Gert Aarts true false 2017-01-10 SPH 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 Δ (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 Nf=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. Conference Paper/Proceeding/Abstract Proceedings of Science (Lattice 2016) 037 24 10 2016 2016-10-24 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2017-05-16T13:36:04.7824547 2017-01-10T16:22:32.5182695 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Gert Aarts 0000-0002-6038-3782 1 0031610-28042017132842.pdf 1610.07439.pdf 2017-01-10T16:22:46.0270000 Output 648613 application/pdf Author's Original true 2017-01-10T00:00:00.0000000 true
title Parity doubling of nucleons and Delta baryons across the deconfinement phase transition
spellingShingle Parity doubling of nucleons and Delta baryons across the deconfinement phase transition
Gert Aarts
title_short Parity doubling of nucleons and Delta baryons across the deconfinement phase transition
title_full Parity doubling of nucleons and Delta baryons across the deconfinement phase transition
title_fullStr Parity doubling of nucleons and Delta baryons across the deconfinement phase transition
title_full_unstemmed Parity doubling of nucleons and Delta baryons across the deconfinement phase transition
title_sort Parity doubling of nucleons and Delta baryons across the deconfinement phase transition
author_id_str_mv 1ba0dad382dfe18348ec32fc65f3f3de
author_id_fullname_str_mv 1ba0dad382dfe18348ec32fc65f3f3de_***_Gert Aarts
author Gert Aarts
author2 Gert Aarts
format Conference Paper/Proceeding/Abstract
container_title Proceedings of Science (Lattice 2016)
container_issue 037
publishDate 2016
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
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description 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 Δ (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 Nf=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.
published_date 2016-10-24T03:38:37Z
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score 11.016235

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