Coupling $g_{f_0{K}^{+}{K}^{-}}$ and the structure of $f_0(980)$

Abstract

We use light-cone QCD sum rules to evaluate the strong coupling $g_{f_0{K}^{+}{K}^{-}}$ which enters in several analyses concerning the scalar $f_0(980)$ meson. The result: $6.2\le g_{f_0{K}^{+}{K}^{-}}\le 7.8$ GeV is larger than in previous determinations.

LaTex, 15 pages, 2 eps figures