Further Analysis on σ-particle Properties

Details Further Analysis on σ-particle Properties Further Analysis on σ-particle Properties

1996-10-15

arxiv.org/abs/hep-ph/9610359v2

Prog. Theor. Phys. 98 (1997) 1005-1010

Physics

High Energy Physics

High Energy Physics - Phenomenology

Updated with recent progress

Scientific paper

10.1143/PTP.98.1005

In a previous work, we have reanalyzed the I=0 S-wave \pi\pi-scattering phase-shift through a new method of Interfering Breit-Wigner amplitudes, and have shown the existence of a light scalar, \sigma particle, accompanied by a negative "repulsive core"-type background phase-shift, whose origin may have some correspondence to a ``compensating'' \pi\pi contact interaction. In this work we make further analysis on the phase shift under KKbar threshold from the same standpoint, to determine precise values of \sigma mass and width, so far as present experimental data are concerned.

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