Accessing the strong interaction between Λ baryons and charged kaons with the femtoscopy technique at the LHC
The interaction between Λ baryons and kaons/antikaons is a crucial ingredient for the strangeness S=0 and S=−2 sector of the meson-baryon interaction at low energies. In particular, the ΛK‾ might help in understanding the origin of states such as the Ξ(1620), whose nature and properties are still un...
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| Körperschaft: | |
| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
10 October 2023
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| In: |
Physics letters
Year: 2023, Jahrgang: 845, Pages: 1-15 |
| ISSN: | 1873-2445 |
| DOI: | 10.1016/j.physletb.2023.138145 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1016/j.physletb.2023.138145 Verlag, kostenfrei, Volltext: https://www.sciencedirect.com/science/article/pii/S0370269323004793 
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| Verfasserangaben: | ALICE Collaboration* |
MARC
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| 245 | 1 | 0 | |a Accessing the strong interaction between Λ baryons and charged kaons with the femtoscopy technique at the LHC |c ALICE Collaboration* |
| 264 | 1 | |c 10 October 2023 | |
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| 500 | |a Online verfügbar: 28. August 2023, Artikelversion: 4. September 2023 | ||
| 500 | |a *ALICE Collaboration: S. Acharya, V. Anguelov, A. Berdnikova, L. Bergmann, A.G. Borquez Carcamo, J. Crkovská, M.C. Danisch, V.J.G. Feuillard, I. Fokin, P. Glässel, M. Kroesen, A. Nath, Y. Pachmayer, K. Reygers, R. Schicker, J.J. Seo, G. Skorodumovs, J. Stachel, S.F. Stiefelmaier, C.A. Van Veen, M.A. Völkl, B. Windelband, Y. Yuncu, F. Zanone [und 1029 weitere Personen] | ||
| 500 | |a Gesehen am 17.05.2024 | ||
| 520 | |a The interaction between Λ baryons and kaons/antikaons is a crucial ingredient for the strangeness S=0 and S=−2 sector of the meson-baryon interaction at low energies. In particular, the ΛK‾ might help in understanding the origin of states such as the Ξ(1620), whose nature and properties are still under debate. Experimental data on Λ-K and Λ-K‾ systems are scarce, leading to large uncertainties and tension between the available theoretical predictions constrained by such data. In this Letter we present the measurements of Λ-K⊕+Λ‾-K− and Λ-K⊕−Λ‾-K+ correlations obtained in the high-multiplicity triggered data sample in pp collisions at s=13 TeV recorded by ALICE at the LHC. The correlation function for both pairs is modeled using the Lednický-Lyuboshits analytical formula and the corresponding scattering parameters are extracted. The Λ-K⊕−Λ‾-K+ correlations show the presence of several structures at relative momenta k⁎ above 200 MeV/c, compatible with the Ω baryon, the Ξ(1690), and Ξ(1820) resonances decaying into Λ-K− pairs. The low k⁎ region in the Λ-K⊕−Λ‾-K+ also exhibits the presence of the Ξ(1620) state, expected to strongly couple to the measured pair. The presented data allow to access the ΛK+ and ΛK− strong interaction with an unprecedented precision and deliver the first experimental observation of the Ξ(1620) decaying into ΛK−. | ||
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