Speaker
Prof.
Marc Wagner
(Goethe University Frankfurt)
Description
We study the light scalar mesons a_0(980) and \kappa using N_f = 2+1+1 flavor twisted mass lattice QCD. In order to probe the internal structure of these scalar mesons, and in particular to identify, whether a sizeable tetraquark component is present, we use a large set of operators, including diquark-antidiquark, mesonic molecule and two-meson operators. We find that the low-lying states overlap essentially exclusively with two-meson states. This indicates that in the channels investigated no tightly bound four quark states of either molecular or diquark-antidiquark type exist.
Primary author
Prof.
Marc Wagner
(Goethe University Frankfurt)
