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Volume 336 - XIII Quark Confinement and the Hadron Spectrum (Confinement2018) - Plenary
Large-${N_{\mathrm{c}}^{}}$ QCD and tetraquarks
H. Sazdjian
Full text: pdf
Pre-published on: 2019 September 12
Published on: 2019 September 26
Tetraquark properties are examined in the limit of large
${N_{\mathrm{c}}^{}}$ of color in QCD. The qualitative differences between molecular and compact tetraquarks are outlined. Consequences of the possible existence of compact tetraquarks are analyzed and shown to lead to upper bounds in the $N_{\mathrm{c}}^{}$-behavior of their decay widths. Open questions on theoretical grounds, related to the dynamics of systems composed of two quarks and two antiquarks, are addressed.
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