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Exact calculations of a quasibound state in the (K)over-bar (K)over-bar N system
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SYSNO ASEP 0450502 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Exact calculations of a quasibound state in the (K)over-bar (K)over-bar N system Author(s) Shevchenko, Nina V. (UJF-V) RID, ORCID, SAI
Haidenbauer, J. (DE)Number of authors 2 Source Title Physical Review. C - ISSN 0556-2813
Roč. 92, č. 4 (2015), 044001Number of pages 7 s. Publication form Print - P Language eng - English Country US - United States Keywords K-P interactions ; sigma-hyperon production ; N three-body system Subject RIV BE - Theoretical Physics R&D Projects GA15-04301S GA ČR - Czech Science Foundation (CSF) Institutional support UJF-V - RVO:61389005 UT WOS 000362898600001 EID SCOPUS 84944392459 DOI 10.1103/PhysRevC.92.044001 Annotation For the (K) over bar (K) over bar interaction separable potentials are employed that are fitted to phase shifts obtained from two theoretical models. The first one is a phenomenological (K) over bar (K) over bar potential based on meson exchange, which is derived by SU(3) symmetry arguments from the Julich pi pi - (K) over bar K coupled-channels model. The other interaction is a variant of the first one, which is adjusted to the K K s-wave scattering length recently determined in lattice QCD simulations. The position and width of the (K) over bar (K) over bar N quasibound state is evaluated in two ways: (i) by a direct pole search in the complex energy plane and (ii) using an "inverse determinant" method, where one needs to calculate the determinant of the AGS system of equations only for real energies. Aquasibound state is found with binding energy B ((K) over bar (K) over bar N) = 12-26 MeV and width Gamma((K$) over bar (K) over bar N) (=) 61-102 MeV, which could correspond to the experimentally observed Xi (1950) state. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2016
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