Measurement of dielectron production in central Pb-Pb collisions at √sNN = 2.76 TeV
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/196328 |
Resumo: | The first measurement of dielectron (e+e−) production in central (0–10%) Pb–Pb collisions at √ sNN = 2.76 TeV at the LHC is presented. The dielectron invariant-mass spectrum is compared to the expected contributions from hadron decays in the invariant-mass range 0 < mee < 3.5 GeV/c2. The ratio of data and the cocktail of hadronic contributions without vacuum ρ0 is measured in the invariant-mass range 0.15 < mee < 0.7 GeV/c2, where an excess of dielectrons is observed in other experiments, and its value is 1.40 ± 0.28 (stat.) ± 0.08 (syst.) ± 0.27 (cocktail). The dielectron spectrum measured in the invariant mass range 0 < mee < 1 GeV/c2 is consistent with the predictions from two theoretical model calculations that include thermal dielectron production from both partonic and hadronic phases with in-medium broadened ρ0 meson. The fraction of direct virtual photons over inclusive virtual photons is extracted for dielectron pairs with invariant mass 0.1 < mee < 0.3 GeV/c2 and in the transverse-momentum intervals 1 < pT,ee < 2 GeV/c and 2 < pT,ee < 4 GeV/c. The measured fraction of virtual direct photons is consistent with the measurement of real direct photons by ALICE and with the expectations from previous dielectron measurements at RHIC within the experimental uncertainties. |
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Acharya, ShreyasiGay Ducati, Maria BeatrizPereira, Luis GustavoPezzi, Rafael PerettiALICE Collaboration2019-06-27T02:36:17Z20190556-2813http://hdl.handle.net/10183/196328001092243The first measurement of dielectron (e+e−) production in central (0–10%) Pb–Pb collisions at √ sNN = 2.76 TeV at the LHC is presented. The dielectron invariant-mass spectrum is compared to the expected contributions from hadron decays in the invariant-mass range 0 < mee < 3.5 GeV/c2. The ratio of data and the cocktail of hadronic contributions without vacuum ρ0 is measured in the invariant-mass range 0.15 < mee < 0.7 GeV/c2, where an excess of dielectrons is observed in other experiments, and its value is 1.40 ± 0.28 (stat.) ± 0.08 (syst.) ± 0.27 (cocktail). The dielectron spectrum measured in the invariant mass range 0 < mee < 1 GeV/c2 is consistent with the predictions from two theoretical model calculations that include thermal dielectron production from both partonic and hadronic phases with in-medium broadened ρ0 meson. The fraction of direct virtual photons over inclusive virtual photons is extracted for dielectron pairs with invariant mass 0.1 < mee < 0.3 GeV/c2 and in the transverse-momentum intervals 1 < pT,ee < 2 GeV/c and 2 < pT,ee < 4 GeV/c. The measured fraction of virtual direct photons is consistent with the measurement of real direct photons by ALICE and with the expectations from previous dielectron measurements at RHIC within the experimental uncertainties.application/pdfengPhysical review. C, Nuclear physics. Melville. Vol. 99, no. 2 (Feb. 2019), 024002, 23 p.Colisões proton-protonAceleradores de partículasMeasurement of dielectron production in central 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:UFRGSTEXT001092243.pdf.txt001092243.pdf.txtExtracted Texttext/plain123869http://www.lume.ufrgs.br/bitstream/10183/196328/2/001092243.pdf.txtbdd27a09db5a3e865b3288cd2fb0f7b1MD52ORIGINAL001092243.pdfTexto completo (inglês)application/pdf1521870http://www.lume.ufrgs.br/bitstream/10183/196328/1/001092243.pdf1a39c9b22419f8eed0cdeecf43b91e77MD5110183/1963282023-11-12 04:24:13.568205oai:www.lume.ufrgs.br:10183/196328Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-11-12T06:24:13Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Measurement of dielectron production in central Pb-Pb collisions at √sNN = 2.76 TeV |
title |
Measurement of dielectron production in central Pb-Pb collisions at √sNN = 2.76 TeV |
spellingShingle |
Measurement of dielectron production in central Pb-Pb collisions at √sNN = 2.76 TeV Acharya, Shreyasi Colisões proton-proton Aceleradores de partículas |
title_short |
Measurement of dielectron production in central Pb-Pb collisions at √sNN = 2.76 TeV |
title_full |
Measurement of dielectron production in central Pb-Pb collisions at √sNN = 2.76 TeV |
title_fullStr |
Measurement of dielectron production in central Pb-Pb collisions at √sNN = 2.76 TeV |
title_full_unstemmed |
Measurement of dielectron production in central Pb-Pb collisions at √sNN = 2.76 TeV |
title_sort |
Measurement of dielectron production in central Pb-Pb collisions 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 |
Colisões proton-proton Aceleradores de partículas |
topic |
Colisões proton-proton Aceleradores de partículas |
description |
The first measurement of dielectron (e+e−) production in central (0–10%) Pb–Pb collisions at √ sNN = 2.76 TeV at the LHC is presented. The dielectron invariant-mass spectrum is compared to the expected contributions from hadron decays in the invariant-mass range 0 < mee < 3.5 GeV/c2. The ratio of data and the cocktail of hadronic contributions without vacuum ρ0 is measured in the invariant-mass range 0.15 < mee < 0.7 GeV/c2, where an excess of dielectrons is observed in other experiments, and its value is 1.40 ± 0.28 (stat.) ± 0.08 (syst.) ± 0.27 (cocktail). The dielectron spectrum measured in the invariant mass range 0 < mee < 1 GeV/c2 is consistent with the predictions from two theoretical model calculations that include thermal dielectron production from both partonic and hadronic phases with in-medium broadened ρ0 meson. The fraction of direct virtual photons over inclusive virtual photons is extracted for dielectron pairs with invariant mass 0.1 < mee < 0.3 GeV/c2 and in the transverse-momentum intervals 1 < pT,ee < 2 GeV/c and 2 < pT,ee < 4 GeV/c. The measured fraction of virtual direct photons is consistent with the measurement of real direct photons by ALICE and with the expectations from previous dielectron measurements at RHIC within the experimental uncertainties. |
publishDate |
2019 |
dc.date.accessioned.fl_str_mv |
2019-06-27T02:36:17Z |
dc.date.issued.fl_str_mv |
2019 |
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/10183/196328 |
dc.identifier.issn.pt_BR.fl_str_mv |
0556-2813 |
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001092243 |
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0556-2813 001092243 |
url |
http://hdl.handle.net/10183/196328 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physical review. C, Nuclear physics. Melville. Vol. 99, no. 2 (Feb. 2019), 024002, 23 p. |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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application/pdf |
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