Doubly heavy QQ tetraquarks
Abstract
With the discovery of a doubly charmed cc baryon a somewhat forgotten issue of tetraquarks containing two heavy and two light (anti) quarks, TQQ, triggered theorist's interest. We discuss quark model estimates of TQQ masses and such objects including a model where the light sector is treated as a soliton. We show that this model has different large Nc limit than other approaches.
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