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First observation of an attractive interaction between a proton and a cascade baryon

Acharya, S. ; Dobrin, A. LU ; Zinovjev, G. and Zurlo, N. (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
; ; and
author collaboration
organization
publishing date
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
2022-04-22 22:45:46
@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}},
}