Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-05-06
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages, 2 eps figure, uses frascatiphys.sty proceedings of Int. Conf. Workshop on Hadron Spectroscopy, Frascati, March 8-12,
Scientific paper
Recently we obtained the evidence for the existence of sigma(600) meson, which had been sought but missing for a long time, by reanalyzing the I=0 S-wave pi pi scattering phase shift. The sigma-existence was also suggested through the analyses of pi pi production processes, pp central collision pp to pp pi^0 pi^0 and J/psi to omega pi pi decay. The observed properties through these works of sigma meson satisfy the mass and width relation of SU(2) linear sigma model. The physical origin of the repulsive background phase shift delta_{BG}, which was essential to lead to the sigma-existence in our phase shift analysis, is also due to the "compensating lambda phi^4-interaction" in linear sigma model. Furthermore in this talk the experimental property of the delta_{BG} is shown to be describable quantitatively in the framework of linear sigma model including rho-meson contribution.
Ishida Muneyuki
Ishida Shin
Ishida Taku
Takamatsu Kunio
Tsuru Tsuneaki
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