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Stable Tetraquarks
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For very heavy quarks, relations derived from heavy-quark symmetry imply novel narrow doubly heavy tetraquark states containing two heavy quarks and two light antiquarks. We predict that double-beauty states will be stable against strong decays, whereas the double-charm states and mixed beauty+charm states will dissociate into pairs of heavy-light mesons. Observing a new double-beauty state through its weak decays would establish the existence of tetraquarks and illuminate the role of heavy color-antitriplet diquarks as hadron constituents.
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Cited by 1 Pith paper
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Cluster reducibility of multiquark operators
Gauge-invariant multiquark operators decompose into products of ordinary hadronic operators, which rules out fully compact multiquark bound states.
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