Systematical investigation on the stability of doubly heavy tetraquark states

• Published in: The European physical journal. A, Hadrons and nuclei Hadrons and nuclei, 2020, Vol.56 (1), Article 9
• Main Authors: Deng, Chengrong, Chen, Hong, Ping, Jialun
• Format: Article
• Language: English
• Subjects: Exchanging; Gluons; Hadrons; Heavy Ions; Multibody systems; Nuclear Fusion; Nuclear Physics; Numerical analysis; Particle and Nuclear Physics; Physics; Physics and Astronomy; Predictions; Regular Article - Theoretical Physics; Stability; Strong interactions (field theory)
• ISSN: 1434-6001; 1434-601X
• DOI: 10.1140/epja/s10050-019-00012-y

We systematically investigate the stability of the doubly heavy tetraquark states [ Q 1 Q 2 ] [ q ¯ 3 q ¯ 4 ] ( Q = c and b , q = u , d and s ) within the framework of the alternative color flux-tube model involving a multi-body confinement potential, σ -exchange, one-gluon exchange and one-Goldstone-boson-exchange interactions. Our numerical analysis indicates that the states [ b b ] [ u ¯ d ¯ ] with 01 + and [ b b ] [ u ¯ s ¯ ] with 1 + are the most promising stable states against the strong interaction. The states [ c c ] [ u ¯ d ¯ ] with 01 + , [ b c ] [ u ¯ d ¯ ] with 00 + and 01 + , and [ b b ] [ u ¯ d ¯ ] with 01 - as stable states are also predicted in the model. The dynamical mechanism producing those stable states with tetrahedral structure are discussed in the model. The states [ b b ] [ u ¯ d ¯ ] and [ b c ] [ u ¯ d ¯ ] with I J P = 12 + would not be stable although they are, respectively, below the B ¯ ∗ B ¯ ∗ and D ∗ B ¯ ∗ thresholds because they can decay into D-wave B ¯ B ¯ and D B ¯ through the strong interaction. The states should have narrow widths if they really exist as our model prediction.