Exploring the NΛ–NΣ coupled system with high precision correlation techniques at the LHC

Detalhes bibliográficos
Autor(a) principal: Acharya, Shreyasi
Data de Publicação: 2022
Outros Autores: Gay Ducati, Maria Beatriz, Pereira, Luis Gustavo, Pezzi, Rafael Peretti, ALICE Collaboration
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/249559
Resumo: The interaction of Λ and Σ hyperons (Y) with nucleons (N) is strongly influenced by the coupled-channel dynamics. Due to the small mass difference of the NΛ and NΣ systems, the sizable coupling strength of the NΣ ↔ NΛ processes constitutes a crucial element in the determination of the NΛ interaction. In this letter we present the most precise measurements on the interaction of pΛ pairs, from zero relative momentum up to the opening of the NΣ channel. The correlation function in the relative momentum space for pΛ ⊕ pΛ-- pairs measured in high-multiplicity triggered pp collisions at √s = 13 TeV at the LHC is reported. The opening of the inelastic NΣ channels is visible in the extracted correlation function as a cusp-like structure occurring at relative momentum k∗ = 289 MeV/c. This represents the first direct experimental observation of the NΣ ↔ NΛ coupled channel in the pΛ system. The correlation function is compared with recent chiral effective field theory calculations, based on different strengths of the NΣ ↔ NΛ transition potential. A weaker coupling, as possibly supported by the present measurement, would require a more repulsive three-body NNΛ interaction for a proper description of the Λ in-medium properties, which has implications on the nuclear equation of state and for the presence of hyperons inside neutron stars.
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spelling Acharya, ShreyasiGay Ducati, Maria BeatrizPereira, Luis GustavoPezzi, Rafael PerettiALICE Collaboration2022-10-03T04:48:40Z20220370-2693http://hdl.handle.net/10183/249559001149126The interaction of Λ and Σ hyperons (Y) with nucleons (N) is strongly influenced by the coupled-channel dynamics. Due to the small mass difference of the NΛ and NΣ systems, the sizable coupling strength of the NΣ ↔ NΛ processes constitutes a crucial element in the determination of the NΛ interaction. In this letter we present the most precise measurements on the interaction of pΛ pairs, from zero relative momentum up to the opening of the NΣ channel. The correlation function in the relative momentum space for pΛ ⊕ pΛ-- pairs measured in high-multiplicity triggered pp collisions at √s = 13 TeV at the LHC is reported. The opening of the inelastic NΣ channels is visible in the extracted correlation function as a cusp-like structure occurring at relative momentum k∗ = 289 MeV/c. This represents the first direct experimental observation of the NΣ ↔ NΛ coupled channel in the pΛ system. The correlation function is compared with recent chiral effective field theory calculations, based on different strengths of the NΣ ↔ NΛ transition potential. A weaker coupling, as possibly supported by the present measurement, would require a more repulsive three-body NNΛ interaction for a proper description of the Λ in-medium properties, which has implications on the nuclear equation of state and for the presence of hyperons inside neutron stars.application/pdfengPhysics letters. B. Amsterdam. Vol. 833 (Oct. 2022), 137272, 12 p.Aceleradores de partículasHiperonsNucleonsExploring the NΛ–NΣ coupled system with high precision correlation techniques 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:UFRGSTEXT001149126.pdf.txt001149126.pdf.txtExtracted Texttext/plain73740http://www.lume.ufrgs.br/bitstream/10183/249559/2/001149126.pdf.txt13a859052a3073567e4eef498d02ae85MD52ORIGINAL001149126.pdfTexto completo (inglês)application/pdf1009174http://www.lume.ufrgs.br/bitstream/10183/249559/1/001149126.pdf035de588d69d7123f709fc1161e293e3MD5110183/2495592023-11-12 04:23:50.764551oai:www.lume.ufrgs.br:10183/249559Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-11-12T06:23:50Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Exploring the NΛ–NΣ coupled system with high precision correlation techniques at the LHC
title Exploring the NΛ–NΣ coupled system with high precision correlation techniques at the LHC
spellingShingle Exploring the NΛ–NΣ coupled system with high precision correlation techniques at the LHC
Acharya, Shreyasi
Aceleradores de partículas
Hiperons
Nucleons
title_short Exploring the NΛ–NΣ coupled system with high precision correlation techniques at the LHC
title_full Exploring the NΛ–NΣ coupled system with high precision correlation techniques at the LHC
title_fullStr Exploring the NΛ–NΣ coupled system with high precision correlation techniques at the LHC
title_full_unstemmed Exploring the NΛ–NΣ coupled system with high precision correlation techniques at the LHC
title_sort Exploring the NΛ–NΣ coupled system with high precision correlation techniques 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 Aceleradores de partículas
Hiperons
Nucleons
topic Aceleradores de partículas
Hiperons
Nucleons
description The interaction of Λ and Σ hyperons (Y) with nucleons (N) is strongly influenced by the coupled-channel dynamics. Due to the small mass difference of the NΛ and NΣ systems, the sizable coupling strength of the NΣ ↔ NΛ processes constitutes a crucial element in the determination of the NΛ interaction. In this letter we present the most precise measurements on the interaction of pΛ pairs, from zero relative momentum up to the opening of the NΣ channel. The correlation function in the relative momentum space for pΛ ⊕ pΛ-- pairs measured in high-multiplicity triggered pp collisions at √s = 13 TeV at the LHC is reported. The opening of the inelastic NΣ channels is visible in the extracted correlation function as a cusp-like structure occurring at relative momentum k∗ = 289 MeV/c. This represents the first direct experimental observation of the NΣ ↔ NΛ coupled channel in the pΛ system. The correlation function is compared with recent chiral effective field theory calculations, based on different strengths of the NΣ ↔ NΛ transition potential. A weaker coupling, as possibly supported by the present measurement, would require a more repulsive three-body NNΛ interaction for a proper description of the Λ in-medium properties, which has implications on the nuclear equation of state and for the presence of hyperons inside neutron stars.
publishDate 2022
dc.date.accessioned.fl_str_mv 2022-10-03T04:48:40Z
dc.date.issued.fl_str_mv 2022
dc.type.driver.fl_str_mv Estrangeiro
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10183/249559
dc.identifier.issn.pt_BR.fl_str_mv 0370-2693
dc.identifier.nrb.pt_BR.fl_str_mv 001149126
identifier_str_mv 0370-2693
001149126
url http://hdl.handle.net/10183/249559
dc.language.iso.fl_str_mv eng
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dc.relation.ispartof.pt_BR.fl_str_mv Physics letters. B. Amsterdam. Vol. 833 (Oct. 2022), 137272, 12 p.
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eu_rights_str_mv openAccess
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