First Observation of an Attractive Interaction between a Proton and a Cascade Baryon

Acharya, S.; ...; Antičić, Tome; ...; Erhardt, Filip; ...; Gotovac, Sven; ...; Jerčić, Marko; ...; Lončar, Petra; ...; Mudnić, Eugen; ...; Planinić, Mirko; ...; Poljak, Nikola; ...; Utrobičić, Antonija; ...; Vicković, Linda; ...; Zurlo, N.

doi:10.1103/physrevlett.123.112002

Pregled bibliografske jedinice broj: 1024869

First Observation of an Attractive Interaction between a Proton and a Cascade Baryon

(ALICE Collaboration) Acharya, S.; ...; Antičić, Tome; ...; Erhardt, Filip; ...; Gotovac, Sven; ...; Jerčić, Marko; ... et al.

First Observation of an Attractive Interaction between a Proton and a Cascade Baryon // Physical review letters, 123 (2019), 11; 112002, 13 doi:10.1103/physrevlett.123.112002 (međunarodna recenzija, članak, znanstveni)

CROSBI ID: 1024869 Za ispravke kontaktirajte CROSBI podršku putem web obrasca

Naslov
First Observation of an Attractive Interaction between a Proton and a Cascade Baryon

Autori
Acharya, S. ; ... ; Antičić, Tome ; ... ; Erhardt, Filip ; ... ; Gotovac, Sven ; ... ; Jerčić, Marko ; ... ; Lončar, Petra ; ... ; Mudnić, Eugen ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ... ; Utrobičić, Antonija ; ... ; Vicković, Linda ; ... ; Zurlo, N.

Kolaboracija
ALICE Collaboration

Izvornik
Physical review letters (0031-9007) 123 (2019), 11; 112002, 13

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
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

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA

Projekti:
HRZZ-IP-2018-01-4108 - Demistificiranje dvočestičnih korelacija u pp sudarima s nadograđenom komorom vremenske projekcije (TPCwithTPC) (Planinić, Mirko, HRZZ - 2018-01) ( CroRIS)

Ustanove:
Fakultet elektrotehnike, strojarstva i brodogradnje, Split,
Institut "Ruđer Bošković", Zagreb,
Prirodoslovno-matematički fakultet, Zagreb

Profili:

Filip Erhardt (autor)