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Exploring the NΛ-NΣ coupled system with high precision correlation techniques at the LHC
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SYSNO ASEP 0560401 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Exploring the NΛ-NΣ coupled system with high precision correlation techniques at the LHC Author(s) Acharya, S. (IN)
Adamová, Dagmar (UJF-V) RID, ORCID, SAI
Adler, A. (DE)
Adolfsson, J. (SE)
Bielčík, J. (CZ)
Bielčíková, Jana (UJF-V) RID, ORCID, SAI
Broz, M. (CZ)
Contreras, J. G. (CZ)
Herman, T. (CZ)
Horák, D. (CZ)
Isakov, Artem (UJF-V) ORCID, SAI
Kotliarov, Artem (UJF-V) ORCID, SAI
Křížek, Filip (UJF-V) RID, ORCID, SAI
Křížková Gajdošová, K. (CZ)
Kushpil, Svetlana (UJF-V) RID, ORCID, SAI
Lavička, R. (CZ)
Mareš, Jiří A. (FZU-D) RID, ORCID
Petráček, V. (CZ)
Šafařík, K. (CZ)
Šumbera, Michal (UJF-V) RID, ORCID, SAI
Torres, S. R. (CZ)
Trzeciak, B. A. (CZ)
Závada, Petr (FZU-D) RID, ORCIDNumber of authors 1002 Article number 137272 Source Title Physics Letters. B. - : Elsevier - ISSN 0370-2693
Roč. 833, OCT (2022)Number of pages 12 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords ALICE collaboration ; heavy ion experiments OECD category Nuclear physics R&D Projects LTT17018 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Research Infrastructure CERN-CZ II - 90104 - Fyzikální ústav AV ČR, v. v. i. Method of publishing Open access Institutional support FZU-D - RVO:68378271 ; UJF-V - RVO:61389005 UT WOS 000837882700003 EID SCOPUS 85136113470 DOI 10.1016/j.physletb.2022.137272 Annotation The interaction of Lambda and Sigma hyperons (Y) with nucleons (N) is strongly influenced by the coupled-channel dynamics. Due to the small mass difference of the N Lambda and N Sigma systems, the sizable coupling strength of the N Sigma - N Lambda processes constitutes a crucial element in the determination of the N Lambda interaction. In this letter we present the most precise measurements on the interaction of p Lambda pairs, from zero relative momentum up to the opening of the N Sigma channel. The correlation function in the relative momentum space for p Lambda circle plus (p) over bar(Lambda) over bar pairs measured in high-multiplicity triggered pp collisions at root s = 13 TeV at the LHC is reported. The opening of the inelastic N Sigma 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 N Sigma - N Lambda coupled channel in the p Lambda system. The correlation function is compared with recent chiral effective field theory calculations, based on different strengths of the N Sigma - N Lambda transition potential. A weaker coupling, as possibly supported by the present measurement, would require a more repulsive three-body NN Lambda interaction for a proper description of the Lambda in-medium properties, which has implications on the nuclear equation of state and for the presence of hyperons inside neutron stars. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2023 Electronic address https://doi.org/10.1016/j.physletb.2022.137272
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