Strange mesons in nuclear matter at finite temperature

We study the properties of K and K mesons in nuclear matter at finite temperature from a chiral unitary approach in coupled channels that incorporates the s and p waves of the kaon-nucleon interaction. The in-medium solution accounts for Pauli blocking effects, mean-field binding on all the baryons...

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Detalhes bibliográficos
Autores: Tolós Rigueiro, Laura, Cabrera, D., Ramos Gómez, Àngels
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2008
País:España
Recursos:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/12225
Acesso em linha:https://hdl.handle.net/2445/12225
Access Level:acceso abierto
Palavra-chave:Mesons (Física nuclear)
Constitució de la matèria
Col·lisions (Física nuclear)
Mesons
Constitution of matter
Collisions (Nuclear physics)
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spelling Strange mesons in nuclear matter at finite temperatureTolós Rigueiro, LauraCabrera, D.Ramos Gómez, ÀngelsMesons (Física nuclear)Constitució de la matèriaCol·lisions (Física nuclear)MesonsConstitution of matterCollisions (Nuclear physics)We study the properties of K and K mesons in nuclear matter at finite temperature from a chiral unitary approach in coupled channels that incorporates the s and p waves of the kaon-nucleon interaction. The in-medium solution accounts for Pauli blocking effects, mean-field binding on all the baryons involved, and {pi} and kaon self-energies. We calculate K and K (off-shell) spectral functions and single-particle properties. The K effective mass gets lowered by about -50 MeV in cold nuclear matter at saturation density and by half this reduction at T=100 MeV. The p-wave contribution to the K optical potential, due to {lambda},{sigma}, and {sigma}* excitations, becomes significant for momenta larger than 200 MeV/c and reduces the attraction felt by the K in the nuclear medium. The K spectral function spreads over a wide range of energies, reflecting the melting of the {lambda}(1405) resonance and the contribution of YN{sup -1} components at finite temperature. In the KN sector, we find that the low-density theorem is a good approximation for the K self-energy close to saturation density due to the absence of resonance-hole excitations. The K potential shows a moderate repulsive behavior, whereas the quasiparticle peak is considerably broadened with increasing density andmore » temperature. We discuss the implications for the decay of the {phi} meson at GSI Schwerionen Synchrotron energies as well as in the future Facility for Antiproton and Ion Research project.« lessThe American Physical Society2008info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/12225Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevC.78.045205Physical Review C, 2008, vol. 78, núm. 4, p. 045205-1-045205-18http://dx.doi.org/10.1103/PhysRevC.78.045205(c) The American Physical Society, 2008info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/122252026-05-27T06:46:51Z
dc.title.none.fl_str_mv Strange mesons in nuclear matter at finite temperature
title Strange mesons in nuclear matter at finite temperature
spellingShingle Strange mesons in nuclear matter at finite temperature
Tolós Rigueiro, Laura
Mesons (Física nuclear)
Constitució de la matèria
Col·lisions (Física nuclear)
Mesons
Constitution of matter
Collisions (Nuclear physics)
title_short Strange mesons in nuclear matter at finite temperature
title_full Strange mesons in nuclear matter at finite temperature
title_fullStr Strange mesons in nuclear matter at finite temperature
title_full_unstemmed Strange mesons in nuclear matter at finite temperature
title_sort Strange mesons in nuclear matter at finite temperature
dc.creator.none.fl_str_mv Tolós Rigueiro, Laura
Cabrera, D.
Ramos Gómez, Àngels
author Tolós Rigueiro, Laura
author_facet Tolós Rigueiro, Laura
Cabrera, D.
Ramos Gómez, Àngels
author_role author
author2 Cabrera, D.
Ramos Gómez, Àngels
author2_role author
author
dc.subject.none.fl_str_mv Mesons (Física nuclear)
Constitució de la matèria
Col·lisions (Física nuclear)
Mesons
Constitution of matter
Collisions (Nuclear physics)
topic Mesons (Física nuclear)
Constitució de la matèria
Col·lisions (Física nuclear)
Mesons
Constitution of matter
Collisions (Nuclear physics)
description We study the properties of K and K mesons in nuclear matter at finite temperature from a chiral unitary approach in coupled channels that incorporates the s and p waves of the kaon-nucleon interaction. The in-medium solution accounts for Pauli blocking effects, mean-field binding on all the baryons involved, and {pi} and kaon self-energies. We calculate K and K (off-shell) spectral functions and single-particle properties. The K effective mass gets lowered by about -50 MeV in cold nuclear matter at saturation density and by half this reduction at T=100 MeV. The p-wave contribution to the K optical potential, due to {lambda},{sigma}, and {sigma}* excitations, becomes significant for momenta larger than 200 MeV/c and reduces the attraction felt by the K in the nuclear medium. The K spectral function spreads over a wide range of energies, reflecting the melting of the {lambda}(1405) resonance and the contribution of YN{sup -1} components at finite temperature. In the KN sector, we find that the low-density theorem is a good approximation for the K self-energy close to saturation density due to the absence of resonance-hole excitations. The K potential shows a moderate repulsive behavior, whereas the quasiparticle peak is considerably broadened with increasing density andmore » temperature. We discuss the implications for the decay of the {phi} meson at GSI Schwerionen Synchrotron energies as well as in the future Facility for Antiproton and Ion Research project.« less
publishDate 2008
dc.date.none.fl_str_mv 2008
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/12225
url https://hdl.handle.net/2445/12225
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevC.78.045205
Physical Review C, 2008, vol. 78, núm. 4, p. 045205-1-045205-18
http://dx.doi.org/10.1103/PhysRevC.78.045205
dc.rights.none.fl_str_mv (c) The American Physical Society, 2008
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) The American Physical Society, 2008
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv The American Physical Society
publisher.none.fl_str_mv The American Physical Society
dc.source.none.fl_str_mv Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300724

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