1 Ocak 2023 Dergi makalesi Açık Erişim

CERN İşbirliği

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    "description": "<p>The interaction between \u039b baryons and kaons/antikaons is a crucial ingredient for the strangeness $S=0$ and $S=-2$ sector of the meson\u2013baryon interaction at low energies. In particular, the $\\Lambda \\stackrel{\u203e}{K}$ might help in understanding the origin of states such as the $\\Xi \\left(1620\\right)$, whose nature and properties are still under debate. Experimental data on $\\Lambda \\text{\u2013}K$ and $\\Lambda \\text{\u2013}\\stackrel{\u203e}{K}$ 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 \u039b\u2013K${}^{+}\\oplus \\stackrel{\u203e}{\\Lambda }\\text{\u2013}$K$^{\u2212}$ and \u039b\u2013K${}^{-}\\oplus \\stackrel{\u203e}{\\Lambda }\\text{\u2013}$K$^{+}$ correlations obtained in the high-multiplicity triggered data sample in pp collisions at $\\sqrt{s}=13$ TeV recorded by ALICE at the LHC. The correlation function for both pairs is modeled using the Lednick\u00fd\u2013Lyuboshits analytical formula and the corresponding scattering parameters are extracted. The \u039b\u2013K${}^{-}\\oplus \\stackrel{\u203e}{\\Lambda }\\text{\u2013}$K$^{+}$ correlations show the presence of several structures at relative momenta ${k}^{\u204e}$ above 200 MeV/c, compatible with the \u03a9 baryon, the $\\Xi \\left(1690\\right)$, and $\\Xi \\left(1820\\right)$ resonances decaying into \u039b\u2013K$^{\u2212}$ pairs. The low ${k}^{\u204e}$ region in the \u039b\u2013K${}^{-}\\oplus \\stackrel{\u203e}{\\Lambda }\\text{\u2013}$K$^{+}$ also exhibits the presence of the $\\Xi \\left(1620\\right)$ state, expected to strongly couple to the measured pair. The presented data allow to access the \u039bK$^{+}$ and \u039bK$^{\u2212}$ strong interaction with an unprecedented precision and deliver the first experimental observation of the $\\Xi \\left(1620\\right)$ decaying into \u039bK$^{\u2212}$.</p>", 
    "doi": "10.1016/j.physletb.2023.138145", 
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    "journal": {
      "title": "Physics Letters B", 
      "volume": "845 C"
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    "publication_date": "2023-01-01", 
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    "science_branches": [
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    "title": "Accessing the strong interaction between \u039b baryons and charged kaons with the femtoscopy technique at the LHC"
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