Thermal photon production in Au plus Au collisions: Viscous corrections in two different hydrodynamic formalisms

Detalhes bibliográficos
Autor(a) principal: Peralta-Ramos, J. [UNESP]
Data de Publicação: 2011
Outros Autores: Nakwacki, M. S.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1016/j.nuclphysa.2010.12.011
http://hdl.handle.net/11449/24036
Resumo: We calculate the spectra of produced thermal photons in Au + Au collisions taking into account the nonequilibrium contribution to photon production due to finite shear viscosity. The evolution of the fireball is modeled by second-order as well as by divergence-type 2 + 1 dissipative hydrodynamics, both with an ideal equation of state and with one based on Lattice QCD that includes an analytical crossover. The spectrum calculated in the divergence-type theory is considerably enhanced with respect to the one calculated in the second-order theory, the difference being entirely due to differences in the viscous corrections to photon production. Our results show that the differences in hydrodynamic formalisms are an important source of uncertainty in the extraction of the value of eta/s from measured photon spectra. The uncertainty in the value of eta/s associated with different hydrodynamic models used to compute thermal photon spectra is larger than the one occurring in matching hadron elliptic flow to RHIC data. (C) 2010 Elsevier B.V. All rights reserved.
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spelling Thermal photon production in Au plus Au collisions: Viscous corrections in two different hydrodynamic formalismsThermal photons spectraHeavy-ion collisionsRelativistic dissipative hydrodynamicsWe calculate the spectra of produced thermal photons in Au + Au collisions taking into account the nonequilibrium contribution to photon production due to finite shear viscosity. The evolution of the fireball is modeled by second-order as well as by divergence-type 2 + 1 dissipative hydrodynamics, both with an ideal equation of state and with one based on Lattice QCD that includes an analytical crossover. The spectrum calculated in the divergence-type theory is considerably enhanced with respect to the one calculated in the second-order theory, the difference being entirely due to differences in the viscous corrections to photon production. Our results show that the differences in hydrodynamic formalisms are an important source of uncertainty in the extraction of the value of eta/s from measured photon spectra. The uncertainty in the value of eta/s associated with different hydrodynamic models used to compute thermal photon spectra is larger than the one occurring in matching hadron elliptic flow to RHIC data. (C) 2010 Elsevier B.V. All rights reserved.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Univ Estadual Paulista, Inst Fis Teor, BR-01140070 São Paulo, BrazilUniv São Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508090 São Paulo, BrazilUniv Estadual Paulista, Inst Fis Teor, BR-01140070 São Paulo, BrazilElsevier B.V.Universidade Estadual Paulista (Unesp)Universidade de São Paulo (USP)Peralta-Ramos, J. [UNESP]Nakwacki, M. S.2014-05-20T14:08:39Z2014-05-20T14:08:39Z2011-02-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article44-57http://dx.doi.org/10.1016/j.nuclphysa.2010.12.011Nuclear Physics A. Amsterdam: Elsevier B.V., v. 851, n. 1, p. 44-57, 2011.0375-9474http://hdl.handle.net/11449/2403610.1016/j.nuclphysa.2010.12.011WOS:000287292300003Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengNuclear Physics A1.9920,938info:eu-repo/semantics/openAccess2021-10-23T10:58:35Zoai:repositorio.unesp.br:11449/24036Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T16:47:11.320787Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Thermal photon production in Au plus Au collisions: Viscous corrections in two different hydrodynamic formalisms
title Thermal photon production in Au plus Au collisions: Viscous corrections in two different hydrodynamic formalisms
spellingShingle Thermal photon production in Au plus Au collisions: Viscous corrections in two different hydrodynamic formalisms
Peralta-Ramos, J. [UNESP]
Thermal photons spectra
Heavy-ion collisions
Relativistic dissipative hydrodynamics
title_short Thermal photon production in Au plus Au collisions: Viscous corrections in two different hydrodynamic formalisms
title_full Thermal photon production in Au plus Au collisions: Viscous corrections in two different hydrodynamic formalisms
title_fullStr Thermal photon production in Au plus Au collisions: Viscous corrections in two different hydrodynamic formalisms
title_full_unstemmed Thermal photon production in Au plus Au collisions: Viscous corrections in two different hydrodynamic formalisms
title_sort Thermal photon production in Au plus Au collisions: Viscous corrections in two different hydrodynamic formalisms
author Peralta-Ramos, J. [UNESP]
author_facet Peralta-Ramos, J. [UNESP]
Nakwacki, M. S.
author_role author
author2 Nakwacki, M. S.
author2_role author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
Universidade de São Paulo (USP)
dc.contributor.author.fl_str_mv Peralta-Ramos, J. [UNESP]
Nakwacki, M. S.
dc.subject.por.fl_str_mv Thermal photons spectra
Heavy-ion collisions
Relativistic dissipative hydrodynamics
topic Thermal photons spectra
Heavy-ion collisions
Relativistic dissipative hydrodynamics
description We calculate the spectra of produced thermal photons in Au + Au collisions taking into account the nonequilibrium contribution to photon production due to finite shear viscosity. The evolution of the fireball is modeled by second-order as well as by divergence-type 2 + 1 dissipative hydrodynamics, both with an ideal equation of state and with one based on Lattice QCD that includes an analytical crossover. The spectrum calculated in the divergence-type theory is considerably enhanced with respect to the one calculated in the second-order theory, the difference being entirely due to differences in the viscous corrections to photon production. Our results show that the differences in hydrodynamic formalisms are an important source of uncertainty in the extraction of the value of eta/s from measured photon spectra. The uncertainty in the value of eta/s associated with different hydrodynamic models used to compute thermal photon spectra is larger than the one occurring in matching hadron elliptic flow to RHIC data. (C) 2010 Elsevier B.V. All rights reserved.
publishDate 2011
dc.date.none.fl_str_mv 2011-02-01
2014-05-20T14:08:39Z
2014-05-20T14:08:39Z
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/10.1016/j.nuclphysa.2010.12.011
Nuclear Physics A. Amsterdam: Elsevier B.V., v. 851, n. 1, p. 44-57, 2011.
0375-9474
http://hdl.handle.net/11449/24036
10.1016/j.nuclphysa.2010.12.011
WOS:000287292300003
url http://dx.doi.org/10.1016/j.nuclphysa.2010.12.011
http://hdl.handle.net/11449/24036
identifier_str_mv Nuclear Physics A. Amsterdam: Elsevier B.V., v. 851, n. 1, p. 44-57, 2011.
0375-9474
10.1016/j.nuclphysa.2010.12.011
WOS:000287292300003
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Nuclear Physics A
1.992
0,938
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 44-57
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
dc.source.none.fl_str_mv Web of Science
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
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