Dataset

GSI-2024-00224

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Accessing the strong interaction between $\Lambda$ baryons and charged kaons with the femtoscopy technique at the LHC

ALICE Collaboration (Corresponding author)

2023

Please use a persistent id in citations: doi:10.17182/HEPDATA.143518

Abstract: The interaction between $\Lambda$ baryons and kaons/antikaons is a crucial part of the strangeness $S=0$ ($\Lambda-\mathrm{K}$) and $S=-2$ ($\Lambda$-$\mathrm{\overline{K}}$) sector of the meson-baryon interaction at low energies and in the understanding of states such as the $\Xi(1620)$, whose nature and properties are still rather unknown. Experimental data on $\Lambda$-K and $\Lambda$-$\mathrm{\overline{K}}$ systems are rather scarce, leading to large uncertainties and tension between the available theoretical predictions. Recently, measurements of two-particle correlations in small colliding systems such as p-p collisions at LHC provided a significant improvement in the knowledge of several hadron-hadron interactions, in particular when strange baryons and mesons are involved. Correlation functions of $\Lambda - $K$^+\oplus \overline{\Lambda} - $K$^-$ and $\Lambda - $K$^-\oplus \overline{\Lambda} - $K$^+$ pairs were measured in Pb-Pb collisions and provided for the first time experimental constraints on the scattering parameters of the underlying interactions. In this letter we extend the measurements to small colliding systems by presenting $\Lambda - $K$^+\oplus \overline{\Lambda} - $K$^-$ and $\Lambda - $K$^-\oplus \overline{\Lambda} - $K$^+$ correlations obtained in the high-multiplicity triggered sample in p-p collisions at $\sqrt{s}=13$ TeV recorded by ALICE. The interaction for both pairs is modeled using the Lednicky-Lyuboshits analytical formula and the corresponding scattering parameters $Ref_0$, $Imf_0$ and $d_0$ are extracted by comparing the theoretical correlation to the data. A repulsive interaction for the $\Lambda - $K$^+\oplus \overline{\Lambda} - $K$^-$ system is found, which is in agreement with previous Pb-Pb results. The non-negligible $Imf_0$ indicates a significant coupling to inelastic channels, such as $\pi$N and $\Sigma$K. The $\Lambda - $K$^+\oplus \overline{\Lambda} - $K$^-$ correlations show the presence of several structures at relative momenta $k^\ast$ above 200 MeV$/c$, compatible with the $\Omega$, $\Xi(1690)$ and $\Xi(1820)$ resonances decaying into $\Lambda-\mathrm{K}^-$ pairs. The low $k^\ast$ region in the $\Lambda - $K$^-\oplus \overline{\Lambda} - $K$^+$ also exhibits the presence of the $\Xi(1620)$ state, expected to strongly couple to the measured pair. The $\Lambda - $K$^-\oplus \overline{\Lambda} - $K$^+$ interaction is hence modeled assuming a resonant contribution, through the formation of the $\Xi(1620)$ state, and a non-resonant one, which dominates the intermediate $k^\ast$ region. The extracted non-resonant scattering parameters are compatible with the Pb-Pb measurements and the extracted pole properties of the $\Xi(1620)$ agree with the recent Belle measurement of $\Xi(1620)\rightarrow\Xi\pi$. The presented data allow to access the $\Lambda - $K$^+\oplus \overline{\Lambda} - $K$^-$ and $\Lambda - $K$^-\oplus \overline{\Lambda} - $K$^+$ interaction with an unprecedented precision and the first experimental observation of the $\Xi(1620)$ decaying into the $\Lambda-\mathrm{K}^-$ channel.

Note: Journal Article GSI record: GSI-2024-00223

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Contributing Institute(s):

1. ALICE (ALI)
2. Detektorlabor (DTL)
3. IT (CIT)
4. ExtreMe Matter Institute, EMMI (EXM)
5. Collaboration CERN: ALICE (ALICE@CERN)

Research Program(s):

1. 612 - Cosmic Matter in the Laboratory (POF4-612) (POF4-612)
2. HGS-HIRe - HGS-HIRe for FAIR (HGS-HIRe) (HGS-HIRe)
3. SUC-GSI-Heidelberg - Strategic university cooperation GSI-U Heidelberg (SUC-GSI-HE) (SUC-GSI-HE)
4. SUC-GSI-Frankfurt - Strategic university cooperation GSI-U Frankfurt/M (SUC-GSI-FR) (SUC-GSI-FR)
5. SUC-GSI-Darmstadt - Strategic university cooperation GSI-TU Darmstadt (SUC-GSI-DA) (SUC-GSI-DA)

Experiment(s):

1. LHC: ALICE

Appears in the scientific report 2023

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article Acharya, S. ; Adamova, D. ; Adler, A. ; et al
Accessing the strong interaction between Λ baryons and charged kaons with the femtoscopy technique at the LHC
Physics letters / B 845, 138145 (2023) [10.1016/j.physletb.2023.138145]2023   Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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