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Doubly heavy tetraquarks in a chiral-diquark picture

Kim, Y.*; Oka, Makoto   ; Suzuki, Kei   

Energy spectrum of doubly heavy tetraquarks, $$T_{QQ}$$ ($$QQ bar{q} bar{q}$$ with $$Q = c, b$$ and $$q = u, d, s$$), is studied in the potential chiral-diquark model. Using the chiral effective theory of diquarks and the quark-diquark-based potential model, the $$T_{bb}$$, $$T_{cc}$$, and $$T_{cb}$$ tetraquarks are described as a three-body system composed of two heavy quarks and an antidiquark. We find several $$T_{bb}$$ bound states, while no $$T_{cc}$$ and $$T_{cb}$$ (deep) bound state is seen. We also study the change of the $$T_{QQ}$$ tetraquark masses under restoration of chiral symmetry.

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Category:Astronomy & Astrophysics

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