First observation of an attractive interaction between a proton and a cascade baryon
(2019) In Physical Review Letters 123(11).- 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 combined p-Ξ-S.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-S.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... (More)
- 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-S.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-S.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. (Less)
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- author
- Acharya, S. ; Dobrin, A. LU ; Zinovjev, G. and Zurlo, N.
- author collaboration
- organization
- publishing date
- 2019
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Equations of state, Hadrons, Lead compounds, Statistics, Tellurium compounds, Attractive interactions, Correlation function, Lattice calculations, Lattice potentials, Multistrange baryons, Standard deviation, Strong interaction, Two particle correlation, Neutrons
- in
- Physical Review Letters
- volume
- 123
- issue
- 11
- article number
- 112002
- publisher
- American Physical Society
- external identifiers
-
- scopus:85072770804
- ISSN
- 0031-9007
- DOI
- 10.1103/PhysRevLett.123.112002
- language
- English
- LU publication?
- yes
- id
- cd8c1f77-a166-4205-b563-a45569cc126b
- date added to LUP
- 2022-04-07 10:21:25
- date last changed
- 2023-03-25 03:31:08
@article{cd8c1f77-a166-4205-b563-a45569cc126b, 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 combined p-Ξ-S.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-S.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.}}, author = {{Acharya, S. and Dobrin, A. and Zinovjev, G. and Zurlo, N.}}, issn = {{0031-9007}}, keywords = {{Equations of state; Hadrons; Lead compounds; Statistics; Tellurium compounds; Attractive interactions; Correlation function; Lattice calculations; Lattice potentials; Multistrange baryons; Standard deviation; Strong interaction; Two particle correlation; Neutrons}}, language = {{eng}}, number = {{11}}, publisher = {{American Physical Society}}, series = {{Physical Review Letters}}, title = {{First observation of an attractive interaction between a proton and a cascade baryon}}, url = {{http://dx.doi.org/10.1103/PhysRevLett.123.112002}}, doi = {{10.1103/PhysRevLett.123.112002}}, volume = {{123}}, year = {{2019}}, }