1999/05/06 by Muneyuki Ishida, Ishida, Muneyuki
Chemistry · Physics and Astronomy · #Advanced NMR Techniques and Applications #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9905259
6 pages, 1 eps figure, uses elsart.sty proceedings of Int. Conf. e+e-collisions from phi to J/psi, Novosibirsk, March 1-5, 1999
arxiv created 1999/05/06 · openalex publication_date 1999/05/06 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Recently, by reanalyzing the phase shift data of I=0 pipi and of I=1/2 Kpi scatterings, we showed the evidences for existence of light scalar mesons, sigma(600) and kappa(900), respectively, which had been sought but missing for a long time. The sigma(600) and kappa(900) together with the established resonances, a0(980) and f0(980), are shown to be consistently classified as the members of a single scalar sigma-nonet, appearing in the SU(3) linear sigma model. Especially the mass value of the iso-singlet flavor-octet member satisfies, together with those of kappa(900) and a0(980), the Gell-Mann Okubo mass formula. The repulsive background phase shift deltaBG, which was essential to lead the sigma/kappa-existence in our phase shift analyses, is also shown to be quantitatively describable in the framework of linear sigma model. Thus, the origin of deltaBG is reduced to the ``compensating lambda phi4-interaction," necessary from the viewpoint of chiral symmetry.