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dc.contributor.authorALICE Collaboration
dc.date.accessioned2022-09-06T11:00:05Z
dc.date.available2022-09-06T11:00:05Z
dc.date.issued2022
dc.identifier.citationALICE Collaboration. (2022). Exploring the NΛ–NΣ coupled system with high precision correlation techniques at the LHC. <i>Physics Letters B</i>, <i>833</i>, Article 137272. <a href="https://doi.org/10.1016/j.physletb.2022.137272" target="_blank">https://doi.org/10.1016/j.physletb.2022.137272</a>
dc.identifier.otherCONVID_155862538
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/82960
dc.description.abstractThe 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 coupling strength of the NΣ↔NΛ processes is non-negligible and 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⊕p¯¯¯Λ¯¯¯¯ 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.en
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherElsevier BV
dc.relation.ispartofseriesPhysics Letters B
dc.rightsCC BY 4.0
dc.titleExploring the NΛ–NΣ coupled system with high precision correlation techniques at the LHC
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-202209064488
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.description.reviewstatuspeerReviewed
dc.relation.issn0370-2693
dc.relation.volume833
dc.type.versionpublishedVersion
dc.rights.copyright© 2022 European Organization for Nuclear Research, ALICE. Published by Elsevier B.V. Funded by SCOAP3
dc.rights.accesslevelopenAccessfi
dc.subject.ysohiukkasfysiikka
dc.subject.ysoydinfysiikka
dc.format.contentfulltext
jyx.subject.urihttp://www.yso.fi/onto/yso/p15576
jyx.subject.urihttp://www.yso.fi/onto/yso/p14759
dc.rights.urlhttps://creativecommons.org/licenses/by/4.0/
dc.relation.doi10.1016/j.physletb.2022.137272


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