Abstract
Inspired by the report of D0 Collaboration on the state with four different flavors, a similar state, is investigated in the present work. The advantage of looking for this state over the state with quark contents, or , is that the threshold is 270 MeV higher than that of , and it allows a large mass region for , which cannot decay to , to be stable. The chiral quark model and Gaussian expansion method are employed to do the calculations of four-quark states, , with quantum numbers (). Two structures, diquark-antidiquark and meson-meson, with all possible color configurations are considered. The results indicate that energies of the tetraquark with diquark-antiquark configuration are all higher than the threshold of , but the resonances are still possible because of their structures. For the state of in the meson-meson structure, the energies are just below the corresponding thresholds, where the color channel coupling plays an important role. The bound state is possible. The distances between two objects (quark/antiquark) show that the state is a molecular one.
- Received 3 August 2018
DOI:https://doi.org/10.1103/PhysRevD.98.054022
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society