title: D(s0)+ (2317)-D0(2308) mass difference as evidence for tetraquarks.
abstract: We argue that the anomalously small mass difference between the D(s0)+ (2317) and the recently observed D0(2308) (Belle) state is the first "smoking gun" experimental evidence of their tetraquark [cq(q q)] structure. The recently reported D(sJ)+ (2632) (SELEX) state completes the low-lying nonexotic tetraquark spectrum, as predicted by 't Hooft's instanton-induced effective quark interaction.
authors.affiliation: Laboratory 010, Vinca Institute, P.O. Box 522, 11001 Belgrade, Serbia.
authors.forename: V
authors.initials: V
authors.lastname: Dmitrasinović