Masses of doubly heavy tetraquarks with error bars Article Swipe
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· 2021
· Open Access
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· DOI: https://doi.org/10.1103/physrevd.103.016001
· OA: W3034474615
In the heavy-quark limit, the two heavy quarks in a doubly heavy baryon or a\ndoubly heavy tetraquark are bound by their color-Coulomb potential into a\ncompact diquark. The doubly heavy hadrons are related by the approximate\nheavy-quark--diquark symmetry of QCD to the heavy hadrons obtained by replacing\nthe heavy diquark by a heavy antiquark. Effective field theories can be used to\nexpand the masses of singly heavy hadrons and doubly heavy hadrons in inverse\npowers of the heavy quark masses. The coefficients in the expansions for doubly\nheavy tetraquarks can be determined from those for heavy mesons, heavy baryons,\nand doubly heavy baryons using heavy-quark--diquark symmetry. We predict the\nmasses of the ground-state doubly heavy tetraquarks with error bars using as\ninputs the masses of heavy mesons and heavy baryons measured in experiments and\nthe masses of doubly heavy baryons calculated using lattice QCD. The only\ndoubly heavy tetraquarks predicted to be stable with respect to strong decays\nare $bb$ tetraquarks with light flavor $\\bar u \\bar d$, $\\bar s \\bar u$ and\n$\\bar s \\bar d$.\n
