Chiral Structure of Scalar and Pseudoscalar Mesons
Figure 5
Mass of light scalar mesons , , and () as functions of the threshold value . The Borel mass for , , and () are chosen to be , , and , respectively. The solid curves are obtained using the tetraquark currents , , , , , and (see definitions in (23), (24), (25), and (26)), while the dashed curves are obtained using the modified currents , , and (see definitions in (35)). The results for are the same as those for .
