Λ+c production and baryon-to-meson ratios in pp and p-Pb collisions at √sNN=5.02 TeV at the LHC
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/235191 |
Resumo: | The prompt production of the charm baryon Λ+c and the Λ+c/D0 production ratios were measured at midrapidity with the ALICE detector in pp and p-Pb collisions at √sNN=5.02 TeV. These new measurements show a clear decrease of the Λ+c/D0 ratio with increasing transverse momentum (pT) in both collision systems in the range 2<pT<12 GeV/c, exhibiting similarities with the light-flavor baryon-to-meson ratios p/π and Λ/K0S. At low pT, predictions that include additional color-reconnection mechanisms beyond the leading-color approximation, assume the existence of additional higher-mass charm-baryon states, or include hadronization via coalescence can describe the data, while predictions driven by charm-quark fragmentation processes measured in e+e− and e−p collisions significantly underestimate the data. The results presented in this Letter provide significant evidence that the established assumption of universality (colliding-system independence) of parton-to-hadron fragmentation is not sufficient to describe charm-baryon production in hadronic collisions at LHC energies. |
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Acharya, ShreyasiGay Ducati, Maria BeatrizPereira, Luis GustavoPezzi, Rafael PerettiALICE Collaboration2022-02-16T04:30:44Z20210031-9007http://hdl.handle.net/10183/235191001136789The prompt production of the charm baryon Λ+c and the Λ+c/D0 production ratios were measured at midrapidity with the ALICE detector in pp and p-Pb collisions at √sNN=5.02 TeV. These new measurements show a clear decrease of the Λ+c/D0 ratio with increasing transverse momentum (pT) in both collision systems in the range 2<pT<12 GeV/c, exhibiting similarities with the light-flavor baryon-to-meson ratios p/π and Λ/K0S. At low pT, predictions that include additional color-reconnection mechanisms beyond the leading-color approximation, assume the existence of additional higher-mass charm-baryon states, or include hadronization via coalescence can describe the data, while predictions driven by charm-quark fragmentation processes measured in e+e− and e−p collisions significantly underestimate the data. The results presented in this Letter provide significant evidence that the established assumption of universality (colliding-system independence) of parton-to-hadron fragmentation is not sufficient to describe charm-baryon production in hadronic collisions at LHC energies.application/pdfengPhysical review letters. Melville. Vol. 127, no. 20 (Nov. 2021), 202301, 13 p.Colisao de ions pesadosAceleradores de partículasColisões proton-protonΛ+c production and baryon-to-meson ratios in pp and p-Pb collisions at √sNN=5.02 TeV at the LHCEstrangeiroinfo: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:UFRGSTEXT001136789.pdf.txt001136789.pdf.txtExtracted Texttext/plain69390http://www.lume.ufrgs.br/bitstream/10183/235191/2/001136789.pdf.txt945770b62ddf05d0f290fe5b73a7b7a5MD52ORIGINAL001136789.pdfTexto completo (inglês)application/pdf331598http://www.lume.ufrgs.br/bitstream/10183/235191/1/001136789.pdf3962ea0d593ee7823fa7350ab2260951MD5110183/2351912023-11-15 04:25:34.724175oai:www.lume.ufrgs.br:10183/235191Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-11-15T06:25:34Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Λ+c production and baryon-to-meson ratios in pp and p-Pb collisions at √sNN=5.02 TeV at the LHC |
title |
Λ+c production and baryon-to-meson ratios in pp and p-Pb collisions at √sNN=5.02 TeV at the LHC |
spellingShingle |
Λ+c production and baryon-to-meson ratios in pp and p-Pb collisions at √sNN=5.02 TeV at the LHC Acharya, Shreyasi Colisao de ions pesados Aceleradores de partículas Colisões proton-proton |
title_short |
Λ+c production and baryon-to-meson ratios in pp and p-Pb collisions at √sNN=5.02 TeV at the LHC |
title_full |
Λ+c production and baryon-to-meson ratios in pp and p-Pb collisions at √sNN=5.02 TeV at the LHC |
title_fullStr |
Λ+c production and baryon-to-meson ratios in pp and p-Pb collisions at √sNN=5.02 TeV at the LHC |
title_full_unstemmed |
Λ+c production and baryon-to-meson ratios in pp and p-Pb collisions at √sNN=5.02 TeV at the LHC |
title_sort |
Λ+c production and baryon-to-meson ratios in pp and p-Pb collisions at √sNN=5.02 TeV at the LHC |
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 |
Colisao de ions pesados Aceleradores de partículas Colisões proton-proton |
topic |
Colisao de ions pesados Aceleradores de partículas Colisões proton-proton |
description |
The prompt production of the charm baryon Λ+c and the Λ+c/D0 production ratios were measured at midrapidity with the ALICE detector in pp and p-Pb collisions at √sNN=5.02 TeV. These new measurements show a clear decrease of the Λ+c/D0 ratio with increasing transverse momentum (pT) in both collision systems in the range 2<pT<12 GeV/c, exhibiting similarities with the light-flavor baryon-to-meson ratios p/π and Λ/K0S. At low pT, predictions that include additional color-reconnection mechanisms beyond the leading-color approximation, assume the existence of additional higher-mass charm-baryon states, or include hadronization via coalescence can describe the data, while predictions driven by charm-quark fragmentation processes measured in e+e− and e−p collisions significantly underestimate the data. The results presented in this Letter provide significant evidence that the established assumption of universality (colliding-system independence) of parton-to-hadron fragmentation is not sufficient to describe charm-baryon production in hadronic collisions at LHC energies. |
publishDate |
2021 |
dc.date.issued.fl_str_mv |
2021 |
dc.date.accessioned.fl_str_mv |
2022-02-16T04:30:44Z |
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/10183/235191 |
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0031-9007 |
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001136789 |
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http://hdl.handle.net/10183/235191 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physical review letters. Melville. Vol. 127, no. 20 (Nov. 2021), 202301, 13 p. |
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info:eu-repo/semantics/openAccess |
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openAccess |
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