Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-09-05
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages, 2 figures, Talk given at YITP workshop ``Possible existence of the sigma-meson and its implications to hadron physics
Scientific paper
In this talk I summarize recently proposed mechanisms to understand pi pi scattering to 1 GeV in an effective chiral Lagrangian. The Lagrangian includes higher resonances in addition to pions consistently with the chiral symmetry. Iso-spin zero S-wave partial wave amplitude is reproduced up till about 1.2 GeV by including a pion self-interaction and resonant pole exchanges of rho, f0(980) and sigma derived from the effective chiral Lagrangian. The best fit shows that sigma has a mass of around 560 MeV and a width of about 370 MeV.
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