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

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 ALIC...

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Autori principali: Acharya, Shreyasi (Autore) , Angelov, Venelin (Autore) , Arslandok, Mesut (Autore) , Danisch, Meike (Autore) , Feuillard, Victor (Autore) , Glässel, Peter (Autore) , Kim, Jiyoung (Autore) , Kim, Minjung (Autore) , Köhler, Markus Konrad (Autore) , Ohlson, Alice (Autore) , Pachmayer, Yvonne C. (Autore) , Reygers, Klaus (Autore) , Schicker, Rainer (Autore) , Schmah, Alexander (Autore) , Schmidt, Marten Ole (Autore) , Stachel, Johanna (Autore) , Windelband, Bernd (Autore) , Yüncü, Alperen (Autore)
Ente Autore: ALICE (Autore)
Natura: Article (Journal)
Lingua:inglese
Pubblicazione: 13 September 2019
In: Physical review letters
Year: 2019, Volume: 123, Fascicolo: 11, Pages: 112002
ISSN:1079-7114
DOI:10.1103/PhysRevLett.123.112002
Accesso online:Verlag, Volltext: https://doi.org/10.1103/PhysRevLett.123.112002
Verlag: https://link.aps.org/doi/10.1103/PhysRevLett.123.112002
Testo
Note sull'autore:S. Acharya et al. (a Large Ion Collider Experiment Collaboration)
Descrizione
Riassunto: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.
Descrizione del documento:Der Name "Yuncu" [Yüncü] ist in der Verfasserangabe falsch geschrieben
Gesehen am 30.10.2019
S. Acharay,V. Anguelov, M. Arslandok, M.C. Danisch, V.J.G. Feuillard, P. Glässel, J. Kim, M. Kim, M.K. Köhler, A. Ohlson, Y. Pachmayer, K. Reygers, R. Schicker, A. Schmah, M.O. Schmidt, J. Stachel, B. Windelband, A. Yuncu [und weitere]
Descrizione fisica:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.123.112002

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