Scalar mesons and Adler zeros

Abstract

A simple unitarized quark-meson model, recently applied with success to light and charmed scalar mesons, is shown to encompass Adler-type zeros in the amplitude, due to the use of relativistic kinematics in the scattering sector. These zeros turn out to be crucial for the description of the $K_0^{\ast }$(800) resonance, as well as the new charmed scalar mesons $D_{s0}^{\ast }$(2317) and $D_0^{\ast }$(2300). ~

Comments: Plain LaTeX, 4 pages, 2 PS figures; selected parallel talk given by G.R. at conference ``Quark Confinement and the Hadron Spectrum VI'', 21-25 Sept. 2004, Villasimius, Sardinia, Italy