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dc.contributor.authorALICE Collaboration
dc.date.accessioned2019-10-11T12:07:30Z
dc.date.available2019-10-11T12:07:30Z
dc.date.issued2019
dc.identifier.citationALICE Collaboration (2019). First Observation of an Attractive Interaction between a Proton and a Cascade Baryon. Physical Review Letters, 123 (11), 112002. DOI: 10.1103/PhysRevLett.123.112002
dc.identifier.otherCONVID_33181986
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/65825
dc.description.abstractThis Letter presents the first experimental observation of the attractive strong interaction between a proton and a multistrange baryon (hyperon) Ξ−. The result is extracted from two-particle correlations of combined p−Ξ−⊕¯p−¯Ξ+ pairs measured in p−Pb collisions at √sNN=5.02  TeV at the LHC with ALICE. The measured correlation function is compared with the prediction obtained assuming only an attractive Coulomb interaction and a standard deviation in the range [3.6, 5.3] is found. Since the measured p−Ξ−⊕¯p−¯Ξ+ correlation is significantly enhanced with respect to the Coulomb prediction, the presence of an additional, strong, attractive interaction is evident. The data are compatible with recent lattice calculations by the HAL-QCD Collaboration, with a standard deviation in the range [1.8, 3.7]. The lattice potential predicts a shallow repulsive Ξ− interaction within pure neutron matter and this implies stiffer equations of state for neutron-rich matter including hyperons. Implications of the strong interaction for the modeling of neutron stars are discussed.en
dc.format.mimetypeapplication/pdf
dc.languageeng
dc.publisherAmerican Physical Society
dc.relation.ispartofseriesPhysical Review Letters
dc.rightsCC BY 4.0
dc.titleFirst Observation of an Attractive Interaction between a Proton and a Cascade Baryon
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201910114403
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.description.reviewstatuspeerReviewed
dc.relation.issn0031-9007
dc.relation.numberinseries11
dc.relation.volume123
dc.type.versionpublishedVersion
dc.rights.copyright© 2019 CERN, for the ALICE Collaboration
dc.rights.accesslevelopenAccessfi
dc.subject.ysohiukkasfysiikka
dc.format.contentfulltext
jyx.subject.urihttp://www.yso.fi/onto/yso/p15576
dc.rights.urlhttps://creativecommons.org/licenses/by/4.0/
dc.relation.doi10.1103/PhysRevLett.123.112002


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