Analysis of the X(3960) and related tetraquark molecular states via the QCD sum rules

• Published in: AAPPS bulletin Vol. 32; no. 1; pp. 1 - 7
• Main Authors: Xin, Qi, Wang, Zhi-Gang, Yang, Xiao-Song
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 05.12.2022; Springer Nature B.V; Springer
• Subjects: Astronomy; Astrophysics and Cosmology; Atomic; Collaboration; Energy; Molecular; Optical and Plasma Physics; Original Article; Particle and Nuclear Physics; Physics; Physics and Astronomy; Symmetry
• ISSN: 2309-4710; 0218-2203; 2309-4710
• DOI: 10.1007/s43673-022-00070-3

In this work, we study the D D ¯ , DD , D D ¯ s , D D s , D s D ¯ s and D s D s tetraquark molecular states with the J PC = 0 + + via the QCD sum rules. The prediction M D s D ¯ s = 3.98 ± 0.10 GeV is in very good agreement with the experimental value M X ( 3960 ) = 3956 ± 5 ± 10 MeV from the LHCb collaboration and supports assigning the X (3960) as the D s + D s - molecular state with the J PC = 0 + + . We take account of our previous works on the four-quark states consisting of two color-neutral clusters and acquire the mass spectrum of the ground state hidden-charm and doubly-charm tetraquark molecular states.