Accessing the strong interaction between Λ baryons and charged kaons with the femtoscopy technique at the LHC



Acharya, S ORCID: 0000-0002-9213-5329, Adamová, D ORCID: 0000-0002-0504-7428, Adler, A, Aglieri Rinella, G ORCID: 0000-0002-9611-3696, Agnello, M ORCID: 0000-0002-0760-5075, Agrawal, N ORCID: 0000-0003-0348-9836, Ahammed, Z ORCID: 0000-0001-5241-7412, Ahmad, S ORCID: 0000-0003-0497-5705, Ahn, SU ORCID: 0000-0001-8847-489X, Ahuja, I ORCID: 0000-0002-4417-1392
et al (show 1043 more authors) (2023) Accessing the strong interaction between Λ baryons and charged kaons with the femtoscopy technique at the LHC. Physics Letters B, 845. p. 138145.

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Abstract

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−.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 02 Oct 2023 15:32
Last Modified: 20 Jun 2024 18:55
DOI: 10.1016/j.physletb.2023.138145
Open Access URL: https://doi.org/10.1016/j.physletb.2023.138145
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3173322