Observed Property of sigma-Meson and Chiral Symmetry

Details Observed Property of sigma-Meson and Chiral Symmetry Observed Property of sigma-Meson and Chiral Symmetry

2000-12-23

arxiv.org/abs/hep-ph/0012325v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

proc. of ``Possible Existence of sigma-Meson and Its Implication to Hadron Physics," YITP, Kyoto, June 12--14, 2000. 5 pages,

Scientific paper

The phenomenologically observed property of sigma(600) in our recent analyses of various pi pi-scattering and -production processes is reviewed and compared with the prediction of SU(2) linear sigma model. Furthermore, a possibility of the scalar sigma-nonet (sigma (600), kappa (900), f_0(980) and a_0(980)) forming with the pseudoscalar pi-nonet a linear representation of SU(3) chiral symmetry is investigated. The origin of repulsive background phase shift delta_BG, which is essential to lead us to the sigma-existence in our phase shift analysis, is shown to come from the repulsive lambda phi^4 interaction.

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