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Parity doubling of nucléons, Delta and Omega baryons across the deconfinement phase transition

Y. Foka, Gert Aarts Orcid Logo, Chris Allton, Davide De Boni, Simon Hands, Chrisanthi Praki, Benjamin Jäger, Jon-Ivar Skullerud, N. Brambilla, V. Kovalenko

EPJ Web of Conferences, Volume: 137, Start page: 07004

Swansea University Author: Gert Aarts Orcid Logo

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DOI (Published version): 10.1051/epjconf/201713707004

Abstract

In this work we analyse positive- and negative-parity channels for the nucleon (spin 1/2 octet), Δ and Ω baryons (spin 3/2 decuplet) using lattice QCD. In Nature, at zero temperature, chiral symmetry is spontaneously broken, causing positive- and negative-parity ground states to have different masse...

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Published in: EPJ Web of Conferences
ISSN: 2100-014X
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa31611
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spelling 2017-05-26T15:54:46.8513052 v2 31611 2017-01-10 Parity doubling of nucléons, Delta and Omega baryons across the deconfinement phase transition 1ba0dad382dfe18348ec32fc65f3f3de 0000-0002-6038-3782 Gert Aarts Gert Aarts true false 2017-01-10 SPH In this work we analyse positive- and negative-parity channels for the nucleon (spin 1/2 octet), Δ and Ω baryons (spin 3/2 decuplet) using lattice QCD. In Nature, at zero temperature, chiral symmetry is spontaneously broken, causing positive- and negative-parity ground states to have different masses. However, chiral symmetry is expected to be restored (for massless quarks) around the crossover temperature, implying that the two opposite parity channels should become degenerate. Here we study what happens in a temperature range which includes both the hadronic and the quark gluon plasma (QGP) phase. By analysing the correlation and spectral functions via exponential fits and the Maximum Entropy Method respectively, we have found parity doubling for the nucleon and Δ baryon channels in the QGP phase. For the Ω baryon we see a clear signal of parity doubling at the crossover temperature, which is however not complete, due to the nonzero strange quark mass. Moreover, in-medium effects in the hadronic phase are evident for all three baryons, in particular for the negative-parity ground states. This might have implications for the hadron resonance gas model. In this work we used the FASTSUM anisotropic Nf=2+1 ensembles. Journal Article EPJ Web of Conferences 137 07004 2100-014X 7 11 2017 2017-11-07 10.1051/epjconf/201713707004 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2017-05-26T15:54:46.8513052 2017-01-10T16:24:10.9397436 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Y. Foka 1 Gert Aarts 0000-0002-6038-3782 2 Chris Allton 3 Davide De Boni 4 Simon Hands 5 Chrisanthi Praki 6 Benjamin Jäger 7 Jon-Ivar Skullerud 8 N. Brambilla 9 V. Kovalenko 10 0031611-26052017155306.pdf epjconf_conf2017_07004.pdf 2017-05-26T15:53:06.0430000 Output 1296950 application/pdf Version of Record true 2017-05-26T00:00:00.0000000 This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. true eng
title Parity doubling of nucléons, Delta and Omega baryons across the deconfinement phase transition
spellingShingle Parity doubling of nucléons, Delta and Omega baryons across the deconfinement phase transition
Gert Aarts
title_short Parity doubling of nucléons, Delta and Omega baryons across the deconfinement phase transition
title_full Parity doubling of nucléons, Delta and Omega baryons across the deconfinement phase transition
title_fullStr Parity doubling of nucléons, Delta and Omega baryons across the deconfinement phase transition
title_full_unstemmed Parity doubling of nucléons, Delta and Omega baryons across the deconfinement phase transition
title_sort Parity doubling of nucléons, Delta and Omega baryons across the deconfinement phase transition
author_id_str_mv 1ba0dad382dfe18348ec32fc65f3f3de
author_id_fullname_str_mv 1ba0dad382dfe18348ec32fc65f3f3de_***_Gert Aarts
author Gert Aarts
author2 Y. Foka
Gert Aarts
Chris Allton
Davide De Boni
Simon Hands
Chrisanthi Praki
Benjamin Jäger
Jon-Ivar Skullerud
N. Brambilla
V. Kovalenko
format Journal article
container_title EPJ Web of Conferences
container_volume 137
container_start_page 07004
publishDate 2017
institution Swansea University
issn 2100-014X
doi_str_mv 10.1051/epjconf/201713707004
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
document_store_str 1
active_str 0
description In this work we analyse positive- and negative-parity channels for the nucleon (spin 1/2 octet), Δ and Ω baryons (spin 3/2 decuplet) using lattice QCD. In Nature, at zero temperature, chiral symmetry is spontaneously broken, causing positive- and negative-parity ground states to have different masses. However, chiral symmetry is expected to be restored (for massless quarks) around the crossover temperature, implying that the two opposite parity channels should become degenerate. Here we study what happens in a temperature range which includes both the hadronic and the quark gluon plasma (QGP) phase. By analysing the correlation and spectral functions via exponential fits and the Maximum Entropy Method respectively, we have found parity doubling for the nucleon and Δ baryon channels in the QGP phase. For the Ω baryon we see a clear signal of parity doubling at the crossover temperature, which is however not complete, due to the nonzero strange quark mass. Moreover, in-medium effects in the hadronic phase are evident for all three baryons, in particular for the negative-parity ground states. This might have implications for the hadron resonance gas model. In this work we used the FASTSUM anisotropic Nf=2+1 ensembles.
published_date 2017-11-07T03:38:37Z
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score 11.016235

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