Abstract
Recently, the LHCb Collaboration reported their observation of the first two fully open-flavor tetraquark states named (2900) and (2900) with unknown parity. Inspired by the report, we consider all the possible four-quark candidates for X(2900), which include the molecular structure, diquark structure, and their coupling in a chiral quark model via the Gaussian expansion method. To identify the genuine resonances, the real-scaling method (stabilization method) was employed. Our results show that five possible resonances, with MeV, with MeV, with MeV, with MeV, and with MeV, originate in the system. Compared with experimental data, with MeV may be an optimal candidate. However, none of the resonances have a similar width for . Hence, further study is required.
Highlights
The study of exotic hadron states, unveils the property of QCD, and challenges the existing theories and models
It’s a controversial issue weather the exotic states exist? Most of the exotic states can be classified in the traditional quark model and the properties of the exotic states can be explained in the framework of quark model with some improvements
Lots of experiment collaborations have been searching for exotic states in these two decades
Summary
The study of exotic hadron states, unveils the property of QCD, and challenges the existing theories and models. Based on an extended relativized quark model, the work [28] found four stable resonances, 2765 MeV, 3055 MeV, 3152 MeV and 3396 MeV, and none of them could be the candidate of X(2900) in the 0+ csqqsystem. Both molecular D∗K∗ and diquark csqqconfiguration have energies near the mass of X(2900). A structure mixing calculation of meson-meson and diquark-antidiquark structures is performed in the framework of chiral quark model (ChQM), and the excited states of subclusters are included. The last section is devoted to the summary of the present work
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