First Observation of an Attractive Interaction between a Proton and a Cascade Baryon (CROSBI ID 269600)
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Podaci o odgovornosti
Acharya, S. ; ... ; Antičić, Tome ; ... ; Erhardt, Filip ; ... ; Gotovac, Sven ; ... ; Jerčić, Marko ; ... ; Lončar, Petra ; ... ; Mudnić, Eugen ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ... ; Utrobičić, Antonija ; ... ; Vicković, Linda ; ... ; Zurlo, N.
ALICE Collaboration
engleski
First Observation of an Attractive Interaction between a Proton and a Cascade Baryon
This Letter presents the first experimental observation of the attractive strong interaction between a proton and a multistrange baryon (hyperon) Ξ-. The result is extracted from two-particle correlations of combined p-Ξ- ⊕p¯-Ξ¯+ pairs measured in p-Pb collisions at sNN=5.02 TeV at the LHC with ALICE. The measured correlation function is compared with the prediction obtained assuming only an attractive Coulomb interaction and a standard deviation in the range [3.6, 5.3] is found. Since the measured p-Ξ-⊕p¯-Ξ¯+ correlation is significantly enhanced with respect to the Coulomb prediction, the presence of an additional, strong, attractive interaction is evident. The data are compatible with recent lattice calculations by the HAL-QCD Collaboration, with a standard deviation in the range [1.8, 3.7]. The lattice potential predicts a shallow repulsive Ξ- interaction within pure neutron matter and this implies stiffer equations of state for neutron-rich matter including hyperons. Implications of the strong interaction for the modeling of neutron stars are discussed.
interaction: Coulomb ; correlation: two-particle ; saturation: density ; n: matter ; strong interaction ; lattice ; hyperon ; correlation function ; equation of state ; CERN LHC Coll ; neutron star ; ALICE ; experimental results ; 5020 GeV-cms/nucleon
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Podaci o izdanju
123 (11)
2019.
112002
13
objavljeno
0031-9007
1079-7114
10.1103/physrevlett.123.112002
Povezanost rada
Fizika