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Doubly heavy tetraquark resonant states

ダブル・ヘビーテトラクォークの共鳴状態

Meng, Q.*; 原田 正康*; 肥山 詠美子; 保坂 淳; 岡 眞   

Meng, Q.*; Harada, Masayasu*; Hiyama, Emiko; Hosaka, Atsushi; Oka, Makoto

ダブルヘビーテトラクォークのスペクトルを計算した。

Spectrum of the doubly heavy tetraquarks, $$bbbar q bar q$$, is studied in a constituent quark model. Four-body problem is solved in a variational method where the real scaling technique is used to identify resonant states above the fall-apart decay thresholds. In addition to the two bound states that were reported in the previous study we have found several narrow resonant states above the $$BB^*$$ and $$B^*B^*$$ thresholds. Their structures are studied and are interpreted by the quark dynamics. A narrow resonance with spin-parity $$J^P=1^+$$ is found to be a mixed state of a compact tetraquark and a $$B^*B^*$$ scattering state. This is driven by a strong color Coulombic attraction between the $$bb$$ quarks. Negative-parity excited resonances with $$J^P=0^-$$, $$1^-$$ and $$2^-$$ form a triplet under the heavy-quark spin symmetry. It turns out that they share a similar structure to the $$lambda$$-mode of a singly heavy baryon as a result of the strongly attractive correlation for the doubly heavy diquark.

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パーセンタイル:97.68

分野:Astronomy & Astrophysics

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