Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-09-28
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, 6 figures. The talk given by A.V. Kiselev at the International Seminar "Quarks-2010", Kolomna, Russia, June 6-12, 201
Scientific paper
The $\pi\pi$ scattering amplitude with regular analytical properties in the $s$ complex plane has been constructed. It describes simultaneously the data on the $\pi\pi$ scattering, $\phi\to\pi^0\pi^0\gamma$ decay and $\pi\pi\to K\bar K$ reaction. The chiral shielding of the $\sigma (600)$ meson and it's mixing with the $f_0(980)$ meson are taken into account also. The data agrees with the four-quark nature of the $\sigma (600)$ and $f_0(980)$ mesons. The amplitude in the range $-5 m_\pi^2 < s < 0.64$ GeV$^2$ also agrees with results, obtained on the base of the chiral expansion, dispersion relations and the Roy equations.
Achasov N. N.
Kiselev Alexander V.
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