First Observation of an Attractive Interaction between a Proton and a Cascade Baryon
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F19%3A00509706" target="_blank" >RIV/61389005:_____/19:00509706 - isvavai.cz</a>
Alternative codes found
RIV/68378271:_____/19:00509706 RIV/68407700:21340/19:00337991
Result on the web
<a href="https://doi.org/10.1103/PhysRevLett.123.112002" target="_blank" >https://doi.org/10.1103/PhysRevLett.123.112002</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevLett.123.112002" target="_blank" >10.1103/PhysRevLett.123.112002</a>
Alternative languages
Result language
angličtina
Original language name
First Observation of an Attractive Interaction between a Proton and a Cascade Baryon
Original language description
This Letter presents the first experimental observation of the attractive strong interaction between a proton and a multistrange baryon (hyperon) Xi(-). The result is extracted from two-particle correlations of combined p-Xi(-) circle plus (p) over bar-(Xi) over bar (+) pairs measured in p-Pb collisions at root S-NN = 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-Xi(-)circle plus(p) over bar-(Xi) over bar (+) 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 Xi(-). 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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10304 - Nuclear physics
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review Letters
ISSN
0031-9007
e-ISSN
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Volume of the periodical
123
Issue of the periodical within the volume
11
Country of publishing house
US - UNITED STATES
Number of pages
13
Pages from-to
112002
UT code for WoS article
000485768100007
EID of the result in the Scopus database
2-s2.0-85072770804