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Report number arXiv:2104.04427 ; CERN-EP-2021-051
Title Exploring the NΛ-NΣ coupled system with high precision correlation techniques at the LHC
Author(s) ALICE Collaboration  Mostrar todos os 1012 autores
Corporate author(s) The ALICE collaboration
Publication 2022-10-10
Imprint 29 Mar 2021
Number of pages 19
Note 19 pages, 2 captioned figures, 2 tables, authors from page 14, published version, figures at http://alice-publications.web.cern.ch/node/7048
Published in: Phys. Lett. B 833 (2022) 137272
DOI 10.1016/j.physletb.2022.137272
Subject category Nuclear Physics - Experiment ; Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ALICE
Keywords QCD ; relativistic heavy ion physics ; quark gluon plasma ; particle correlations and fluctuations ; experimental results
Abstract 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 coupling strength of the NΣNΛ 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 pΛp¯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 NΣNΛ coupled channel in the pΛ system. The correlation function is compared with recent chiral effective field theory calculations, based on different strengths of the NΣNΛ 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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Copyright/License publication: © 2022-2025 CERN (License: CC-BY-4.0), sponsored by SCOAP³
preprint: © 2021-2025 CERN (License: CC-BY-4.0)
Submitted by javier.castillo.castellanos@cern.ch



 


 Record created 2021-03-29, last modified 2025-03-04


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