QCD sum rule approach for the light scalar mesons as four-quark states

Brito, Thiago V.; Navarra, Fernando S.; Nielsen, Marina; Bracco, Mirian E.

QCD sum rule approach for the light scalar mesons as four-quark states

Authors

Description

We study the two point-function for the scalar mesons $σ, κ, f_0(980)$ and $a_0(980)$ as diquak-antidiquark states. We also study the decays of these mesons into $ππ$, $Kπ$ and $K\bar{K}$. We found that the couplings are consistent with existing experimental data, pointing in favor of the four-quark structure for the light scalar mesons.
6 pages, 4 figures