The QCD Dynamics of Tetraquark Production

Abstract

We use the twist dimensions of the operators underlying the dynamical behavior of exclusive production processes as a tool for determining the structure of exotic heavy-quark states such as the $Z_c^{+}(4430)$ tetraquark. The resulting counting rules predict distinctive fall-offs of the cross sections in center-of-mass energy, thus distinguishing whether the tetraquarks are segregated into di-meson molecules, diquark-antidiquark pairs, or more democratically arranged four-quark states. In addition, we propose straightforward methods of experimentally producing additional exotic multiquark states.

7 pages, no figures, REVTeX. Corrects minor typos present in published version

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• QCD Compositeness as Revealed in Exclusive Vector Boson Reactions through Double-Photon Annihilation: $e^{+}{e}^{-}\to \gamma {\gamma }^{\ast }\to \gamma V^0$ and $e^{+}{e}^{-}\to {\gamma }^{\ast }{\gamma }^{\ast }\to V^0{V}^0$
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• Experimental review of the ${\rm Y}(1S,2S,3S)$ physics at $e^{+}{e}^{-}$ colliders and the LHC
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• Search for ${\rm Y}(1S,2S)\to Z_c^{+}{Z}_c^{(\prime )-}$ and $e^{+}{e}^{-}\to Z_c^{+}{Z}_c^{(\prime )-}$ at $\sqrt{s}$ = 10.52, 10.58, and 10.867 GeV
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• Conference Summary of QNP2018