caa a22 4500 465809286 CHVBK 20180323112111.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF02902617 doi (NATIONALLICENCE)springer-10.1007/BF02902617 Gensini P. Dipartimento di Fisica dell'Università and I.N.F.N., I-06100, Perugia aut A current algebra description of kaon-nucleus scattering lengths [Elektronische Daten] [P. Gensini] Описание с помощью алгебры токов длин рассеяния каонов на ядрах Summary: Current algebra sum rules for kaon-nucleus elastic-scattering amplitudes are re-written as off-mass-shell, finite-contour forward dispersion relations. Saturating these latter with narrow levels, both in the meson-nucleus continua and in the bound-state spectra, we produce a general formula for the dependence of the real parts of kaon-nucleus scattering lengths on the target quantum numbers. We introduce explicitly a shell-model description of nuclear ground-states, which was instrumental in reproducing with satisfactory accuracy the corresponding pion-nucleus data: most of the effects observed there (up to and including the 2s−1d shell) were consistent with a naive spherical-harmonic-oscillator picture. An output of this analysis is the (average) kaon-nucleon sigma-term: the value derived here stays as large as found in two previous estimates by ourselves, the first from a slightly less sophisticated analysis of (mostly) the same data, the second derived from the dispersion-relation evaluations of the zero-energy, fixed-t kaon-nucleon scattering amplitudes made by Oades. Such a large value (about 640 MeV) confirms the hypothesis, advanced by Donoghue and Nappi, of a large, nonperturbative, strange-quark scalar density in the nucleon. Società Italiana di Fisica, 1990 11.30.Rd - Chiral symmetries nationallicence 11.50.Li - Sum rules nationallicence 25.80.Nv - Kaon-nucleus elastic scattering nationallicence Il Nuovo Cimento A (1965-1970) Società Italiana di Fisica 103/1(1990-01-01), 9-32 103:1<9 1990 103 40763 https://doi.org/10.1007/BF02902617 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02902617 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Gensini P. Dipartimento di Fisica dell'Università and I.N.F.N., I-06100, Perugia aut NATIONALLICENCE 773 0- Il Nuovo Cimento A (1965-1970) Società Italiana di Fisica 103/1(1990-01-01), 9-32 103:1<9 1990 103 40763 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer