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

Acharya S.
•
Adamova D.
•
Adhya S. P.
altro
Zurlo N.
2019
  • journal article

Periodico
PHYSICAL REVIEW LETTERS
Abstract
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 − ̄ þ pffiffiffiffiffiffiffi ⊕ p ̄ -Ξ pairs measured in p-Pb collisions at sNN 1⁄4 5.02 TeV at the LHC with ALICE. combined p-Ξ 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 ̄þ 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.
DOI
10.1103/PhysRevLett.123.112002
WOS
WOS:000485768100007
Archivio
http://hdl.handle.net/11368/2951317
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85072770804
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.123.112002
Diritti
open access
license:creative commons
license uri:http://creativecommons.org/licenses/by/4.0/
FVG url
https://arts.units.it/bitstream/11368/2951317/1/PRL_123(2019)112002_1-13.pdf
Soggetti
  • BOUND-STATE

  • COLLISIONS

Scopus© citazioni
34
Data di acquisizione
Jun 7, 2022
Vedi dettagli
Web of Science© citazioni
47
Data di acquisizione
Mar 26, 2024
Visualizzazioni
3
Data di acquisizione
Apr 19, 2024
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