1 Ocak 2022 Dergi makalesi Açık Erişim

CERN İşbirliği

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    "description": "<p>The interaction of \u039b and \u03a3 hyperons (Y) with nucleons (N) is strongly influenced by the coupled-channel dynamics. Due to the small mass difference of the N\u039b and N\u03a3 systems, the sizable coupling strength of the $N\\Sigma \u2194N\\Lambda $ processes constitutes a crucial element in the determination of the N\u039b interaction. In this letter we present the most precise measurements on the interaction of p\u039b pairs, from zero relative momentum up to the opening of the N\u03a3 channel. The correlation function in the relative momentum space for $p\\Lambda \\oplus \\stackrel{\u203e}{p}\\stackrel{\u203e}{\\Lambda }$ pairs measured in high-multiplicity triggered pp collisions at $\\sqrt{s}\\phantom{\\rule{0.25em}{0ex}}=\\phantom{\\rule{0.25em}{0ex}}13$ TeV at the LHC is reported. The opening of the inelastic N\u03a3 channels is visible in the extracted correlation function as a cusp-like structure occurring at relative momentum ${k}^{\u204e}=289\\phantom{\\rule{0.25em}{0ex}}\\text{MeV/}c$. This represents the first direct experimental observation of the $N\\Sigma \u2194N\\Lambda $ coupled channel in the p\u039b system. The correlation function is compared with recent chiral effective field theory calculations, based on different strengths of the $N\\Sigma \u2194N\\Lambda $ transition potential. A weaker coupling, as possibly supported by the present measurement, would require a more repulsive three-body NN\u039b interaction for a proper description of the \u039b in-medium properties, which has implications on the nuclear equation of state and for the presence of hyperons inside neutron stars.</p>", 
    "doi": "10.1016/j.physletb.2022.137272", 
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    "journal": {
      "title": "Physics Letters B", 
      "volume": "833 C"
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    "science_branches": [
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    "title": "Exploring the N\u039b\u2013N\u03a3 coupled system with high precision correlation techniques at the LHC"
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