Regular Article – Theoretical Physics
Description of the newly observed states as molecular states
College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing, People’s Republic of China
2 School of Nuclear Science and Technology, Lanzhou University, 730000, Lanzhou, People’s Republic of China
3 School of Physical Science and Technology, Southwest Jiaotong University, 610031, Chengdu, People’s Republic of China
Accepted: 10 December 2020
Published online: 23 December 2020
Very recently, three new structures , , and at the invariant mass spectrum of observed by the LHCb Collaboration trigger a hot discussion about their inner structure. In this work, we study the strong decay mode of the newly observed assuming that the is a molecular state. With the possible quantum numbers and , the partial decay widths of the molecular state into the , ,and final states through hadronic loop are calculated with the help of the effective Lagrangians. By comparison with the LHCb observation, the current results of total decay width support the as molecule while the decay width of the and can not be well reproduced in the molecular state picture. In addition, the calculated partial decay widths with S wave molecular state picture indicate that allowed decay mode, , may have the biggest branching ratio for the . The experimental measurements for this strong decay process could be a crucial test for the molecule interpretation of the .
© The Author(s) 2020
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