QCD sum rules for the Δ isobar in neutron matter
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1103/PhysRevC.98.025206 http://hdl.handle.net/11449/228587 |
Resumo: | We study the properties of the Δ isobar in the symmetric and asymmetric nuclear matter using the QCD sum rules approach based on the energy dispersion relation. Allowing for different continuum thresholds for the polarization tensors with different dimensions, we find stable masses for the Δ in both the vacuum and the medium. Compared to the nucleon case, we find that the vector repulsion is smaller for the Δ while the scalar attraction is similar (75 MeV vector repulsion and 200 MeV scalar attraction in the symmetric matter). The smaller vector repulsion can be understood using the Pauli principle and a constituent quark model. Also, the isospin dependence of the quasiparticle energy, which mainly comes from the vector self-energy, is quite weak. We also allow for an explicit π-N continuum contribution to the polarization function but find its effect to be minimal. Phenomenological consequences of our results are discussed. |
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QCD sum rules for the Δ isobar in neutron matterWe study the properties of the Δ isobar in the symmetric and asymmetric nuclear matter using the QCD sum rules approach based on the energy dispersion relation. Allowing for different continuum thresholds for the polarization tensors with different dimensions, we find stable masses for the Δ in both the vacuum and the medium. Compared to the nucleon case, we find that the vector repulsion is smaller for the Δ while the scalar attraction is similar (75 MeV vector repulsion and 200 MeV scalar attraction in the symmetric matter). The smaller vector repulsion can be understood using the Pauli principle and a constituent quark model. Also, the isospin dependence of the quasiparticle energy, which mainly comes from the vector self-energy, is quite weak. We also allow for an explicit π-N continuum contribution to the polarization function but find its effect to be minimal. Phenomenological consequences of our results are discussed.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)National Research FoundationInstituto de Física Teórica Universidade Estadual PaulistaDepartment of Physics Institute of Physics and Applied Physics Yonsei UniversityAsia Pacific Center for Theoretical PhysicsInstituto de Física Teórica Universidade Estadual PaulistaFAPESP: 2016/02717-8National Research Foundation: 2016R1D1A1B03930089FAPESP: 2017/15346-0National Research Foundation: 2017R1D1A1B03033685National Research Foundation: 2018R1D1A1B07043234Universidade Estadual Paulista (UNESP)Yonsei UniversityAsia Pacific Center for Theoretical PhysicsJesuel Marques, L. [UNESP]Lee, Su HoungPark, AaronMatheus, R. D. [UNESP]Jeong, Kie Sang2022-04-29T08:27:31Z2022-04-29T08:27:31Z2018-08-22info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1103/PhysRevC.98.025206Physical Review C, v. 98, n. 2, 2018.2469-99932469-9985http://hdl.handle.net/11449/22858710.1103/PhysRevC.98.0252062-s2.0-85052734973Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPhysical Review Cinfo:eu-repo/semantics/openAccess2022-04-29T08:27:32Zoai:repositorio.unesp.br:11449/228587Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T15:38:22.447207Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
QCD sum rules for the Δ isobar in neutron matter |
title |
QCD sum rules for the Δ isobar in neutron matter |
spellingShingle |
QCD sum rules for the Δ isobar in neutron matter Jesuel Marques, L. [UNESP] |
title_short |
QCD sum rules for the Δ isobar in neutron matter |
title_full |
QCD sum rules for the Δ isobar in neutron matter |
title_fullStr |
QCD sum rules for the Δ isobar in neutron matter |
title_full_unstemmed |
QCD sum rules for the Δ isobar in neutron matter |
title_sort |
QCD sum rules for the Δ isobar in neutron matter |
author |
Jesuel Marques, L. [UNESP] |
author_facet |
Jesuel Marques, L. [UNESP] Lee, Su Houng Park, Aaron Matheus, R. D. [UNESP] Jeong, Kie Sang |
author_role |
author |
author2 |
Lee, Su Houng Park, Aaron Matheus, R. D. [UNESP] Jeong, Kie Sang |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) Yonsei University Asia Pacific Center for Theoretical Physics |
dc.contributor.author.fl_str_mv |
Jesuel Marques, L. [UNESP] Lee, Su Houng Park, Aaron Matheus, R. D. [UNESP] Jeong, Kie Sang |
description |
We study the properties of the Δ isobar in the symmetric and asymmetric nuclear matter using the QCD sum rules approach based on the energy dispersion relation. Allowing for different continuum thresholds for the polarization tensors with different dimensions, we find stable masses for the Δ in both the vacuum and the medium. Compared to the nucleon case, we find that the vector repulsion is smaller for the Δ while the scalar attraction is similar (75 MeV vector repulsion and 200 MeV scalar attraction in the symmetric matter). The smaller vector repulsion can be understood using the Pauli principle and a constituent quark model. Also, the isospin dependence of the quasiparticle energy, which mainly comes from the vector self-energy, is quite weak. We also allow for an explicit π-N continuum contribution to the polarization function but find its effect to be minimal. Phenomenological consequences of our results are discussed. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-08-22 2022-04-29T08:27:31Z 2022-04-29T08:27:31Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1103/PhysRevC.98.025206 Physical Review C, v. 98, n. 2, 2018. 2469-9993 2469-9985 http://hdl.handle.net/11449/228587 10.1103/PhysRevC.98.025206 2-s2.0-85052734973 |
url |
http://dx.doi.org/10.1103/PhysRevC.98.025206 http://hdl.handle.net/11449/228587 |
identifier_str_mv |
Physical Review C, v. 98, n. 2, 2018. 2469-9993 2469-9985 10.1103/PhysRevC.98.025206 2-s2.0-85052734973 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Physical Review C |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128542190338048 |