Zc(3900) as a Four-Quark State
Abstract
Using the method of QCD Sum Rules, we derive the correlator Z for a state consisting of two charm quarks and two light quarks, ccud, and carry out a Borel transform to find Z(MB). From this we find the solution that MB 3.9 .2 GeV, showing that the Zc(3900) is a tetra-quark state.
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