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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 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Exact calculations of a quasibound state in the (K)over-bar (K)over-bar N system Tvůrce(i) Shevchenko, Nina V. (UJF-V) RID, ORCID, SAI
Haidenbauer, J. (DE)Celkový počet autorů 2 Zdroj.dok. Physical Review. C - ISSN 0556-2813
Roč. 92, č. 4 (2015), 044001Poč.str. 7 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova K-P interactions ; sigma-hyperon production ; N three-body system Vědní obor RIV BE - Teoretická fyzika CEP GA15-04301S GA ČR - Grantová agentura ČR Institucionální podpora UJF-V - RVO:61389005 UT WOS 000362898600001 EID SCOPUS 84944392459 DOI 10.1103/PhysRevC.92.044001 Anotace 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. Pracoviště Ústav jaderné fyziky Kontakt Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Rok sběru 2016
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