Azimuthally differential pion femtoscopy in Pb-Pb collisions at √sNN = 2.76 TeV
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/165593 |
Resumo: | We present the first azimuthally differential measurements of the pion source size relative to the second harmonic event plane in Pb-Pb collisions at a center-of-mass energy per nucleon-nucleon pair of sNN p ¼ 2.76 TeV. The measurements have been performed in the centrality range 0%–50% and for pion pair transverse momenta 0.2 < kT < 0.7 GeV=c. We find that the Rside and Rout radii, which characterize the pion source size in the directions perpendicular and parallel to the pion transverse momentum, oscillate out of phase, similar to what was observed at the Relativistic Heavy Ion Collider. The final-state source eccentricity, estimated via Rside oscillations, is found to be significantly smaller than the initial-state source eccentricity, but remains positive—indicating that even after a stronger expansion in the in-plane direction, the pion source at the freeze-out is still elongated in the out-of-plane direction. The 3 þ 1D hydrodynamic calculations are in qualitative agreement with observed centrality and transverse momentum Rside oscillations, but systematically underestimate the oscillation magnitude. |
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Adamova, DagmarGay Ducati, Maria BeatrizPereira, Luis GustavoPezzi, Rafael PerettiALICE Collaboration2017-08-23T02:30:33Z20170031-9007http://hdl.handle.net/10183/165593001025341We present the first azimuthally differential measurements of the pion source size relative to the second harmonic event plane in Pb-Pb collisions at a center-of-mass energy per nucleon-nucleon pair of sNN p ¼ 2.76 TeV. The measurements have been performed in the centrality range 0%–50% and for pion pair transverse momenta 0.2 < kT < 0.7 GeV=c. We find that the Rside and Rout radii, which characterize the pion source size in the directions perpendicular and parallel to the pion transverse momentum, oscillate out of phase, similar to what was observed at the Relativistic Heavy Ion Collider. The final-state source eccentricity, estimated via Rside oscillations, is found to be significantly smaller than the initial-state source eccentricity, but remains positive—indicating that even after a stronger expansion in the in-plane direction, the pion source at the freeze-out is still elongated in the out-of-plane direction. The 3 þ 1D hydrodynamic calculations are in qualitative agreement with observed centrality and transverse momentum Rside oscillations, but systematically underestimate the oscillation magnitude.application/pdfengPhysical review letters. Melville. Vol. 118, no. 22 (June 2017), 222301, 12 p.Colisao de ions pesadosAceleradores de partículasAzimuthally differential pion femtoscopy in Pb-Pb collisions 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:UFRGSORIGINAL001025341.pdf001025341.pdfTexto completo (inglês)application/pdf521294http://www.lume.ufrgs.br/bitstream/10183/165593/1/001025341.pdfe4462767941641db547f74f295d1eb76MD51TEXT001025341.pdf.txt001025341.pdf.txtExtracted Texttext/plain59744http://www.lume.ufrgs.br/bitstream/10183/165593/2/001025341.pdf.txtb6b063ad441b2f53283c1b5ee74c0e41MD52THUMBNAIL001025341.pdf.jpg001025341.pdf.jpgGenerated Thumbnailimage/jpeg1872http://www.lume.ufrgs.br/bitstream/10183/165593/3/001025341.pdf.jpgaa11109f98a97fb217efa8c9b3b4811dMD5310183/1655932023-11-30 04:22:45.490096oai:www.lume.ufrgs.br:10183/165593Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-11-30T06:22:45Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Azimuthally differential pion femtoscopy in Pb-Pb collisions at √sNN = 2.76 TeV |
title |
Azimuthally differential pion femtoscopy in Pb-Pb collisions at √sNN = 2.76 TeV |
spellingShingle |
Azimuthally differential pion femtoscopy in Pb-Pb collisions at √sNN = 2.76 TeV Adamova, Dagmar Colisao de ions pesados Aceleradores de partículas |
title_short |
Azimuthally differential pion femtoscopy in Pb-Pb collisions at √sNN = 2.76 TeV |
title_full |
Azimuthally differential pion femtoscopy in Pb-Pb collisions at √sNN = 2.76 TeV |
title_fullStr |
Azimuthally differential pion femtoscopy in Pb-Pb collisions at √sNN = 2.76 TeV |
title_full_unstemmed |
Azimuthally differential pion femtoscopy in Pb-Pb collisions at √sNN = 2.76 TeV |
title_sort |
Azimuthally differential pion femtoscopy in Pb-Pb collisions at √sNN = 2.76 TeV |
author |
Adamova, Dagmar |
author_facet |
Adamova, Dagmar 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 |
Adamova, Dagmar Gay Ducati, Maria Beatriz Pereira, Luis Gustavo Pezzi, Rafael Peretti ALICE Collaboration |
dc.subject.por.fl_str_mv |
Colisao de ions pesados Aceleradores de partículas |
topic |
Colisao de ions pesados Aceleradores de partículas |
description |
We present the first azimuthally differential measurements of the pion source size relative to the second harmonic event plane in Pb-Pb collisions at a center-of-mass energy per nucleon-nucleon pair of sNN p ¼ 2.76 TeV. The measurements have been performed in the centrality range 0%–50% and for pion pair transverse momenta 0.2 < kT < 0.7 GeV=c. We find that the Rside and Rout radii, which characterize the pion source size in the directions perpendicular and parallel to the pion transverse momentum, oscillate out of phase, similar to what was observed at the Relativistic Heavy Ion Collider. The final-state source eccentricity, estimated via Rside oscillations, is found to be significantly smaller than the initial-state source eccentricity, but remains positive—indicating that even after a stronger expansion in the in-plane direction, the pion source at the freeze-out is still elongated in the out-of-plane direction. The 3 þ 1D hydrodynamic calculations are in qualitative agreement with observed centrality and transverse momentum Rside oscillations, but systematically underestimate the oscillation magnitude. |
publishDate |
2017 |
dc.date.accessioned.fl_str_mv |
2017-08-23T02:30:33Z |
dc.date.issued.fl_str_mv |
2017 |
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/10183/165593 |
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0031-9007 |
dc.identifier.nrb.pt_BR.fl_str_mv |
001025341 |
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0031-9007 001025341 |
url |
http://hdl.handle.net/10183/165593 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physical review letters. Melville. Vol. 118, no. 22 (June 2017), 222301, 12 p. |
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info:eu-repo/semantics/openAccess |
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openAccess |
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