Two photon couplings of the lightest isoscalars from BELLE data

Abstract

Amplitude Analysis of two photon production of $\pi \pi$ and $\overline{K}K$, using S-matrix constraints and fitting all available data, including the latest precision results from Belle, yields a single partial wave solution up to 1.4 GeV. The two photon couplings of the $\sigma /f_0(500)$, $f_0(980)$ and $f_2(1270)$ are determined from the residues of the resonance poles.

Comments: 11 pages, 3 figures, extended for details