Exploring the NΛ–NΣ coupled system with high precision correlation techniques at the LHC (CROSBI ID 315094)
Prilog u časopisu | Pismo (znanstveno) | međunarodna recenzija
Podaci o odgovornosti
Acharya, S. ; ... ; Erhardt, Filip ; ... ; Gotovac, Sven ; ... ; Jerčić, Marko ; ... ; Karatović, David ; ... ; Lončar, Petra ; ... ; Mudnić, Eugen ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ... ; Vicković, Linda ; ... ; Zurlo, N.
ALICE Collaboration
engleski
Exploring the NΛ–NΣ coupled system with high precision correlation techniques at the LHC
The interaction of and hyperons (Y) with nucleons (N) is strongly influenced by the coupled-channel dynamics. Due to the small mass difference of the N and Nsystems, the sizable coupling strength of the N↔N processes constitutes a crucial element in the determination of the N interaction. In this letter we present the most precise measurements on the interaction of p pairs, from zero relative momentum up to the opening of the N channel. The correlation function in the relative momentum space for p⊕p pairs measured in high-multiplicity triggered pp collisions at √s = 13 TeV at the LHC is reported. The opening of the inelastic N channels is visible in the extracted correlation function as a cusp-like structure occurring at relative momentum k∗ = 289 MeV/c. This represents the first direct experimental observation of the N ↔ N coupled channel in the p system. The correlation function is compared with recent chiral effective field theory calculations, based on different strengths of the N ↔ N transition potential. A weaker coupling, as possibly supported by the present measurement, would require a more repulsive three-body NNinteraction for a proper description of the in-medium properties, which has implications on the nuclear equation of state and for the presence of hyperons inside neutron stars.
nucleon Lambda: interaction ; up: momentum ; effective field theory: chiral ; nucleus: equation of state ; potential: transition ; p p: scattering ; correlation function ; coupled channel ; CERN LHC Coll ; hyperon ; coupling constant ; mass difference ; neutron star ; correlation ; 13000 GeV-cms/nucleon
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
Podaci o izdanju
833
2022.
137272
12
objavljeno
0370-2693
1873-2445
10.1016/j.physletb.2022.137272