Study of the interaction between $Ξ$ baryons and light mesons via femtoscopy at the LHC
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912614960857088 |
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| author | ALICE Collaboration |
| author_facet | ALICE Collaboration |
| contents | Meson-baryon systems with strangeness content provide a unique laboratory for investigating the strong interaction and testing theoretical models of hadron structure and dynamics. In this work, the measured correlation functions for oppositely charged $Ξ-{\rm K}$ and $Ξ-π$ pairs obtained in high-multiplicity pp collisions at $\sqrt{s} = 13$ TeV at the LHC are presented. For the first time, high-precision data on the $Ξ-{\rm K}$ interaction are delivered at small relative momenta. The scattering lengths, extracted via the Lednický-Lyuboshits expression of the pair wavefunction, indicate a repulsive and a shallow attractive strong interaction for the $Ξ-{\rm K}$ and $Ξ-π$ systems, respectively. The $Ξ(1620)$ and $Ξ(1690)$ states are observed in the $Ξ-π$ correlation function and their properties, mass and width, are determined. These measurements are in agreement with other available results. Such high-precision data can help refine the understanding of these resonant states, provide stronger constraints for chirally motivated potentials, and address the key challenge of describing the coupled-channel dynamics that may give rise to molecular configurations. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_24519 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Study of the interaction between $Ξ$ baryons and light mesons via femtoscopy at the LHC ALICE Collaboration Nuclear Experiment High Energy Physics - Experiment Meson-baryon systems with strangeness content provide a unique laboratory for investigating the strong interaction and testing theoretical models of hadron structure and dynamics. In this work, the measured correlation functions for oppositely charged $Ξ-{\rm K}$ and $Ξ-π$ pairs obtained in high-multiplicity pp collisions at $\sqrt{s} = 13$ TeV at the LHC are presented. For the first time, high-precision data on the $Ξ-{\rm K}$ interaction are delivered at small relative momenta. The scattering lengths, extracted via the Lednický-Lyuboshits expression of the pair wavefunction, indicate a repulsive and a shallow attractive strong interaction for the $Ξ-{\rm K}$ and $Ξ-π$ systems, respectively. The $Ξ(1620)$ and $Ξ(1690)$ states are observed in the $Ξ-π$ correlation function and their properties, mass and width, are determined. These measurements are in agreement with other available results. Such high-precision data can help refine the understanding of these resonant states, provide stronger constraints for chirally motivated potentials, and address the key challenge of describing the coupled-channel dynamics that may give rise to molecular configurations. |
| title | Study of the interaction between $Ξ$ baryons and light mesons via femtoscopy at the LHC |
| topic | Nuclear Experiment High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2509.24519 |