Exploring the NΛ–NΣ coupled system with high precision correlation techniques at the LHC
Lambda baryon
DOI:
10.1016/j.physletb.2022.137272
Publication Date:
2022-07-04T11:42:01Z
AUTHORS (1012)
ABSTRACT
The interaction of $\Lambda$ and $\Sigma$ hyperons (Y) with nucleons (N) is strongly influenced by the coupled-channel dynamics. Due to small mass difference $\rm N \Lambda$ \Sigma$ systems, sizeable coupling strength \Sigma\leftrightarrow processes constitutes a crucial element in determination N$\Lambda$ interaction. In this letter we present most precise measurements on p$\Lambda$ pairs, from zero relative momentum up opening channel. correlation function space for $\mathrm{p}\Lambda\oplus\overline{\mathrm{p}}\overline{\Lambda}$ pairs measured high-multiplicity triggered pp collisions at $\sqrt{s}~=~13$ TeV LHC reported. inelastic N$\Sigma$ channels visible extracted as cusp-like structure occurring $k^{*}$ = 289 MeV/$c$. This represents first direct experimental observation \Sigma\rightarrow coupled channel system. compared recent chiral effective field theory calculations, based different strengths transition potential. A weaker coupling, possibly supported measurement, would require more repulsive three-body NN$\Lambda$ proper description in-medium properties, which has implications nuclear equation state presence inside neutron stars.
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