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PHYSICAL REVIEW LETTERS
Volume 94, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.94.162002
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We argue that the anomalously small mass difference between the D-s0(+)(2317) and the recently observed D-0(2308) (Belle) state is the first smoking gun experimental evidence of their tetraquark [cq((qq) over bar)] 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.
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