D(s0)+ (2317)-D0(2308) mass difference as evidence for tetraquarks.
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.
Dmitrasinović
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Laboratory 010, Vinca Institute, P.O. Box 522, 11001 Belgrade, Serbia.