Azimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb–Pbcollisions at √sNN = 2.76 TeV
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 UFRGS |
Texto Completo: | http://hdl.handle.net/10183/187848 |
Resumo: | Azimuthally-differential femtoscopic measurements, being sensitive to spatio-temporal characteristics of the source as well as to the collective velocity fields at freeze out, provide very important information on the nature and dynamics of the system evolution. While the HBT radii oscillations relative to the second harmonic event plane measured recently reflect mostly the spatial geometry of the source, model studies have shown that the HBT radii oscillations relative to the third harmonic event plane are predominantly defined by the velocity fields. In this Letter, we present the first results on azimuthally-differential pion femtoscopy relative to the third harmonic event plane as a function of the pion pair transverse momentum kTfor different collision centralities in Pb–Pb collisions at √sNN=2.76TeV. We find that the Rsideand Routradii, which characterize the pion source size in the directions perpendicular and parallel to the pion transverse momentum, oscillate in phase relative to the third harmonic event plane, similar to the results from 3+1D hydrodynamical calculations. The observed radii oscillations unambiguously signal a collective expansion and anisotropy in the velocity fields. A comparison of the measured radii oscillations with the Blast-Wave model calculations indicate that the initial state triangularity is washed-out at freeze out. |
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Acharya, ShreyasiGay Ducati, Maria BeatrizPereira, Luis GustavoPezzi, Rafael PerettiALICE Collaboration2019-01-18T02:31:17Z20180370-2693http://hdl.handle.net/10183/187848001083084Azimuthally-differential femtoscopic measurements, being sensitive to spatio-temporal characteristics of the source as well as to the collective velocity fields at freeze out, provide very important information on the nature and dynamics of the system evolution. While the HBT radii oscillations relative to the second harmonic event plane measured recently reflect mostly the spatial geometry of the source, model studies have shown that the HBT radii oscillations relative to the third harmonic event plane are predominantly defined by the velocity fields. In this Letter, we present the first results on azimuthally-differential pion femtoscopy relative to the third harmonic event plane as a function of the pion pair transverse momentum kTfor different collision centralities in Pb–Pb collisions at √sNN=2.76TeV. We find that the Rsideand Routradii, which characterize the pion source size in the directions perpendicular and parallel to the pion transverse momentum, oscillate in phase relative to the third harmonic event plane, similar to the results from 3+1D hydrodynamical calculations. The observed radii oscillations unambiguously signal a collective expansion and anisotropy in the velocity fields. A comparison of the measured radii oscillations with the Blast-Wave model calculations indicate that the initial state triangularity is washed-out at freeze out.application/pdfengPhysics letters. B. Amsterdam. Vol. 785 (Oct. 2018), p. 320-331Aceleradores de partículasColisao de ions pesadosAzimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb–Pbcollisions at √sNN = 2.76 TeVEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001083084.pdf.txt001083084.pdf.txtExtracted Texttext/plain63726http://www.lume.ufrgs.br/bitstream/10183/187848/2/001083084.pdf.txt0783ebde3e0c29376ae02c3cdfeff4faMD52ORIGINAL001083084.pdfTexto completo (inglês)application/pdf1488635http://www.lume.ufrgs.br/bitstream/10183/187848/1/001083084.pdf1530bbecbe934d146d86591bf6c2d7b8MD5110183/1878482023-11-30 04:23:25.367491oai:www.lume.ufrgs.br:10183/187848Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-11-30T06:23:25Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Azimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb–Pbcollisions at √sNN = 2.76 TeV |
title |
Azimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb–Pbcollisions at √sNN = 2.76 TeV |
spellingShingle |
Azimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb–Pbcollisions at √sNN = 2.76 TeV Acharya, Shreyasi Aceleradores de partículas Colisao de ions pesados |
title_short |
Azimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb–Pbcollisions at √sNN = 2.76 TeV |
title_full |
Azimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb–Pbcollisions at √sNN = 2.76 TeV |
title_fullStr |
Azimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb–Pbcollisions at √sNN = 2.76 TeV |
title_full_unstemmed |
Azimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb–Pbcollisions at √sNN = 2.76 TeV |
title_sort |
Azimuthally-differential pion femtoscopy relative to the third harmonic event plane in Pb–Pbcollisions at √sNN = 2.76 TeV |
author |
Acharya, Shreyasi |
author_facet |
Acharya, Shreyasi Gay Ducati, Maria Beatriz Pereira, Luis Gustavo Pezzi, Rafael Peretti ALICE Collaboration |
author_role |
author |
author2 |
Gay Ducati, Maria Beatriz Pereira, Luis Gustavo Pezzi, Rafael Peretti ALICE Collaboration |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Acharya, Shreyasi Gay Ducati, Maria Beatriz Pereira, Luis Gustavo Pezzi, Rafael Peretti ALICE Collaboration |
dc.subject.por.fl_str_mv |
Aceleradores de partículas Colisao de ions pesados |
topic |
Aceleradores de partículas Colisao de ions pesados |
description |
Azimuthally-differential femtoscopic measurements, being sensitive to spatio-temporal characteristics of the source as well as to the collective velocity fields at freeze out, provide very important information on the nature and dynamics of the system evolution. While the HBT radii oscillations relative to the second harmonic event plane measured recently reflect mostly the spatial geometry of the source, model studies have shown that the HBT radii oscillations relative to the third harmonic event plane are predominantly defined by the velocity fields. In this Letter, we present the first results on azimuthally-differential pion femtoscopy relative to the third harmonic event plane as a function of the pion pair transverse momentum kTfor different collision centralities in Pb–Pb collisions at √sNN=2.76TeV. We find that the Rsideand Routradii, which characterize the pion source size in the directions perpendicular and parallel to the pion transverse momentum, oscillate in phase relative to the third harmonic event plane, similar to the results from 3+1D hydrodynamical calculations. The observed radii oscillations unambiguously signal a collective expansion and anisotropy in the velocity fields. A comparison of the measured radii oscillations with the Blast-Wave model calculations indicate that the initial state triangularity is washed-out at freeze out. |
publishDate |
2018 |
dc.date.issued.fl_str_mv |
2018 |
dc.date.accessioned.fl_str_mv |
2019-01-18T02:31:17Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/187848 |
dc.identifier.issn.pt_BR.fl_str_mv |
0370-2693 |
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001083084 |
identifier_str_mv |
0370-2693 001083084 |
url |
http://hdl.handle.net/10183/187848 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physics letters. B. Amsterdam. Vol. 785 (Oct. 2018), p. 320-331 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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Repositório Institucional da UFRGS |
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