Heavy-Quark Symmetry Implies Stable Heavy Tetraquark Mesons Q_{i}Q_{j}q[over ¯]_{k}q[over ¯]_{l}.
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DOI: 10.1103/physrevlett.119.202002
Abstract: For very heavy quarks Q, relations derived from heavy-quark symmetry predict the existence of novel narrow doubly heavy tetraquark states of the form Q_{i}Q_{j}q[over ¯]_{k}q[over ¯]_{l} (subscripts label flavors), where q designates a light quark.… read more here.
Keywords: heavy quark; heavy tetraquark; quark; quark symmetry ... See more keywords