Y ( 4626 ) in a chiral constituent quark model

Recently, the Belle Collaboration reported a new exotic state Y(4620) with mass at 4625.9 MeV in the positronium annihilation process. Inspired by experiment, we study the tetraquark system c¯s s¯c with quantum numbers JP = 1− in the framework of chiral constituent quark model with the help of Gauss...

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Bibliographic Details
Published in:Physical review. D 2020-03, Vol.101 (5), p.1, Article 054010
Main Authors: Tan, Yue, Ping, Jialun
Format: Article
Language:English
Subjects:
Constituents
Mesons
Positronium
Quantum numbers
Quark models
Quarks
Resonance
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Summary:Recently, the Belle Collaboration reported a new exotic state Y(4620) with mass at 4625.9 MeV in the positronium annihilation process. Inspired by experiment, we study the tetraquark system c¯s s¯c with quantum numbers JP = 1− in the framework of chiral constituent quark model with the help of Gaussian expansion method. Two structures, diquark-antidiquark and meson-meson, with all possible color and spin configurations are considered. The result shows that no bound state can be formed. To investigate the possible resonance states, the real scaling method is employed. Several resonance states with energies 4354, 4408, 4469, 4497, and 4531 MeV are proposed. Taking into account the errors in calculating the q¯q mesons, the system errors in the calculation of four-quark system are around 60–100 MeV. The resonance with energy 4531 MeV is possible the candidate of the newly found state Y(4620).
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.101.054010