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QCD Inequalities and the $D_s(2320)$

S. Nussinov
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Abstract

We discuss the new state $D_{sJ}(2317)$ discovered by BaBar and demonstrate using QCD inequalities that if indeed the $f_0(980)$ and the new $D_{sJ}(2317)$ ($0^+$) are primarilly made of four quarks that a new I=0 ``$\bar DD$ bound state'' at a mass smaller than 3660 MeV must exist. Observation of such a state will constitute definitive evidence for four-quark states.

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S. Nussinov. 2003-06-20. QCD Inequalities and the $D_s(2320)$. https://arxiv.org/abs/hep-ph/0306187

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