dc.contributor.author ALICE Collaboration dc.contributor.author Chang, BeomSu dc.contributor.author Kim, Dong Jo dc.contributor.author Parkkila, Jasper dc.contributor.author Rak, Jan dc.contributor.author Räsänen, Sami dc.contributor.author Slupecki, Maciej dc.contributor.author Snellman, Tomas dc.contributor.author Trzaska, Wladyslaw dc.contributor.author Vargyas, Márton dc.contributor.author Viinikainen, Jussi dc.date.accessioned 2019-03-07T09:26:08Z dc.date.available 2019-03-07T09:26:08Z dc.date.issued 2019 fi dc.identifier.citation ALICE Collaboration. (2019). p−p, p−Λ, and Λ−Λ correlations studied via femtoscopy in pp reactions at √s = 7 TeV. Physical Review C, 99 (2), 024001. doi:10.1103/PhysRevC.99.024001 fi dc.identifier.other TUTKAID_80877 dc.identifier.uri https://jyx.jyu.fi/handle/123456789/63059 dc.description.abstract We report on the first femtoscopic measurement of baryon pairs, such as p−p, p−Λ, and Λ−Λ, measured by ALICE at the Large Hadron Collider (LHC) in proton-proton collisions at √s=7 TeV. This study demonstrates the feasibility of such measurements in pp collisions at ultrarelativistic energies. The femtoscopy method is employed to constrain the hyperon-nucleon and hyperon-hyperon interactions, which are still rather poorly understood. A new method to evaluate the influence of residual correlations induced by the decays of resonances and experimental impurities is hereby presented. The p−p, p−Λ, and Λ−Λ correlation functions were fitted simultaneously with the help of a new tool developed specifically for the femtoscopy analysis in small colliding systems: Correlation Analysis Tool using the Schrödinger equation (CATS). Within the assumption that in pp collisions the three particle pairs originate from a common source, its radius is found to be equal to r0=1.125±0.018(stat)+0.058−0.035(syst) fm. The sensitivity of the measured p−Λ correlation is tested against different scattering parameters, which are defined by the interaction among the two particles, but the statistics is not sufficient yet to discriminate among different models. The measurement of the Λ−Λ correlation function constrains the phase space spanned by the effective range and scattering length of the strong interaction. Discrepancies between the measured scattering parameters and the resulting correlation functions at LHC and RHIC energies are discussed in the context of various models. fi dc.format.mimetype application/pdf dc.language.iso eng dc.publisher American Physical Society dc.relation.ispartofseries Physical Review C dc.rights CC BY 4.0 dc.subject.other hiukkasfysiikka fi dc.subject.other proton-proton collisions fi dc.subject.other lambda baryons fi dc.title p−p, p−Λ, and Λ−Λ correlations studied via femtoscopy in pp reactions at √s = 7 TeV fi dc.type article dc.identifier.urn URN:NBN:fi:jyu-201903061763 dc.contributor.laitos Fysiikan laitos fi dc.contributor.laitos Department of Physics en dc.type.uri http://purl.org/eprint/type/JournalArticle dc.date.updated 2019-03-06T16:15:13Z dc.description.reviewstatus peerReviewed dc.relation.issn 2469-9985 dc.relation.numberinseries 2 dc.relation.volume 99 dc.type.version publishedVersion dc.rights.copyright ©2019 CERN, for the ALICE Collaboration dc.rights.accesslevel openAccess fi dc.format.content fulltext dc.rights.url https://creativecommons.org/licenses/by/4.0/ dc.relation.doi 10.1103/PhysRevC.99.024001
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