Mechanism for a next-to-lowest lying scalar meson nonet - art. no. 074001

Recent work suggests the existence of a nonconventional lowest-lying scalar nonet containing the a(0)(980). Then the a(0)(1450) and also the K-0*(1430 ) are likely candidates to belong to a conventional p-wave q (q) over bar n onet. However. a comparison of their properties with those expected on this basis reveals a number of puzzling features. It is pointed out that these puzzles can be resolved in a natural and robust way by assuming a ''bare'' conventional p-wave scalar q (q) over bar nonet to mix with a Lighter four- quark qq (q) over bar (q) over bar scalar nonet to form new "physical" stat es. The essential mechanism is driven by the fact that the isospinor is lig hter than the isovector in the unmixed qq (q) over bar (q) over bar multipl et.