Evidence of rescattering effect in Pb–Pb collisions at the LHC through production of K∗(892)0 and φ(1020) mesons
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/212569 |
Resumo: | Measurements of K∗(892)0 and φ(1020) resonance production in Pb–Pb and pp collisions at √sNN = 5.02 TeV with the ALICE detector at the Large Hadron Collider are reported. The resonances are measured at midrapidity (|y| < 0.5) via their hadronic decay channels and the transverse momentum (pT) distributions are obtained for various collision centrality classes up to pT = 20 GeV/c. The pT-integrated yield ratio K∗(892)0/K in Pb–Pb collisions shows significant suppression relative to pp collisions and decreases towards more central collisions. In contrast, the φ(1020)/K ratio does not show any suppression. Furthermore, the measured K∗(892)0/K ratio in central Pb–Pb collisions is significantly suppressed with respect to the expectations based on a thermal model calculation, while the φ(1020)/K ratio agrees with the model prediction. These measurements are an experimental demonstration of rescattering of K∗(892)0 decay products in the hadronic phase of the collisions. The K∗(892)0/K yield ratios in Pb–Pb and pp collisions are used to estimate the time duration between chemical and kinetic freeze-out, which is found to be ∼ 4–7 fm/c for central collisions. The pT-differential ratios of K∗(892)0/K, φ(1020)/K, K∗(892)0/π, φ(1020)/π, p/K∗(892)0 and p/φ(1020) are also presented for Pb–Pb and pp collisions at √sNN = 5.02 TeV. These ratios show that the rescattering effect is predominantly a low-pT phenomenon. |
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Acharya, ShreyasiGay Ducati, Maria BeatrizPereira, Luis GustavoPezzi, Rafael PerettiALICE Collaboration2020-08-04T03:38:33Z20200370-2693http://hdl.handle.net/10183/212569001114876Measurements of K∗(892)0 and φ(1020) resonance production in Pb–Pb and pp collisions at √sNN = 5.02 TeV with the ALICE detector at the Large Hadron Collider are reported. The resonances are measured at midrapidity (|y| < 0.5) via their hadronic decay channels and the transverse momentum (pT) distributions are obtained for various collision centrality classes up to pT = 20 GeV/c. The pT-integrated yield ratio K∗(892)0/K in Pb–Pb collisions shows significant suppression relative to pp collisions and decreases towards more central collisions. In contrast, the φ(1020)/K ratio does not show any suppression. Furthermore, the measured K∗(892)0/K ratio in central Pb–Pb collisions is significantly suppressed with respect to the expectations based on a thermal model calculation, while the φ(1020)/K ratio agrees with the model prediction. These measurements are an experimental demonstration of rescattering of K∗(892)0 decay products in the hadronic phase of the collisions. The K∗(892)0/K yield ratios in Pb–Pb and pp collisions are used to estimate the time duration between chemical and kinetic freeze-out, which is found to be ∼ 4–7 fm/c for central collisions. The pT-differential ratios of K∗(892)0/K, φ(1020)/K, K∗(892)0/π, φ(1020)/π, p/K∗(892)0 and p/φ(1020) are also presented for Pb–Pb and pp collisions at √sNN = 5.02 TeV. These ratios show that the rescattering effect is predominantly a low-pT phenomenon.application/pdfengPhysics letters. B. Amsterdam. Vol. 802 (Mar. 2020), 135223, 14 p.Aceleradores de partículasColisao de ions pesadosColisões proton-protonEvidence of rescattering effect in Pb–Pb collisions at the LHC through production of K∗(892)0 and φ(1020) mesonsEstrangeiroinfo: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:UFRGSTEXT001114876.pdf.txt001114876.pdf.txtExtracted Texttext/plain86895http://www.lume.ufrgs.br/bitstream/10183/212569/2/001114876.pdf.txt28efca537b594e5854f146704aab0366MD52ORIGINAL001114876.pdfTexto completo (inglês)application/pdf930951http://www.lume.ufrgs.br/bitstream/10183/212569/1/001114876.pdf055cda38601cd20fc3ec42241c6f5422MD5110183/2125692023-11-15 04:25:38.651301oai:www.lume.ufrgs.br:10183/212569Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-11-15T06:25:38Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Evidence of rescattering effect in Pb–Pb collisions at the LHC through production of K∗(892)0 and φ(1020) mesons |
title |
Evidence of rescattering effect in Pb–Pb collisions at the LHC through production of K∗(892)0 and φ(1020) mesons |
spellingShingle |
Evidence of rescattering effect in Pb–Pb collisions at the LHC through production of K∗(892)0 and φ(1020) mesons Acharya, Shreyasi Aceleradores de partículas Colisao de ions pesados Colisões proton-proton |
title_short |
Evidence of rescattering effect in Pb–Pb collisions at the LHC through production of K∗(892)0 and φ(1020) mesons |
title_full |
Evidence of rescattering effect in Pb–Pb collisions at the LHC through production of K∗(892)0 and φ(1020) mesons |
title_fullStr |
Evidence of rescattering effect in Pb–Pb collisions at the LHC through production of K∗(892)0 and φ(1020) mesons |
title_full_unstemmed |
Evidence of rescattering effect in Pb–Pb collisions at the LHC through production of K∗(892)0 and φ(1020) mesons |
title_sort |
Evidence of rescattering effect in Pb–Pb collisions at the LHC through production of K∗(892)0 and φ(1020) mesons |
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 Colisões proton-proton |
topic |
Aceleradores de partículas Colisao de ions pesados Colisões proton-proton |
description |
Measurements of K∗(892)0 and φ(1020) resonance production in Pb–Pb and pp collisions at √sNN = 5.02 TeV with the ALICE detector at the Large Hadron Collider are reported. The resonances are measured at midrapidity (|y| < 0.5) via their hadronic decay channels and the transverse momentum (pT) distributions are obtained for various collision centrality classes up to pT = 20 GeV/c. The pT-integrated yield ratio K∗(892)0/K in Pb–Pb collisions shows significant suppression relative to pp collisions and decreases towards more central collisions. In contrast, the φ(1020)/K ratio does not show any suppression. Furthermore, the measured K∗(892)0/K ratio in central Pb–Pb collisions is significantly suppressed with respect to the expectations based on a thermal model calculation, while the φ(1020)/K ratio agrees with the model prediction. These measurements are an experimental demonstration of rescattering of K∗(892)0 decay products in the hadronic phase of the collisions. The K∗(892)0/K yield ratios in Pb–Pb and pp collisions are used to estimate the time duration between chemical and kinetic freeze-out, which is found to be ∼ 4–7 fm/c for central collisions. The pT-differential ratios of K∗(892)0/K, φ(1020)/K, K∗(892)0/π, φ(1020)/π, p/K∗(892)0 and p/φ(1020) are also presented for Pb–Pb and pp collisions at √sNN = 5.02 TeV. These ratios show that the rescattering effect is predominantly a low-pT phenomenon. |
publishDate |
2020 |
dc.date.accessioned.fl_str_mv |
2020-08-04T03:38:33Z |
dc.date.issued.fl_str_mv |
2020 |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
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001114876 |
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url |
http://hdl.handle.net/10183/212569 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physics letters. B. Amsterdam. Vol. 802 (Mar. 2020), 135223, 14 p. |
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info:eu-repo/semantics/openAccess |
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openAccess |
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