Abstract
We investigate the exotic hadrons consisting of two light quarks and two heavy antiquarks, \((q\bar{Q})\)-\((q\bar{Q})\). The spin-dependent term between quarks is known to give an attraction to the ud spin-0 component in the isospin-0 \(u\bar{c} d\bar{c}\) system, \(T_{cc}\). However, the said component also gets a repulsion from the partial Pauli-blocking. By the dynamical calculation with a simplified quark model, we discuss that the competition of the two effects leads to a shallow bound state for \(T_{cc}\), which is preferred from the experiment, and a deep bound state for \(T_{bb}\).
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Acknowledgements
This work is supported in part by Kakenhi Grants-in-Aid for Scientific Research [Grant No. 21H04478(A)] and Innovative Areas (Grant No. 18H05407) (AH), Grants-in-Aid for Scientific Research [Grant No. 22H04940(S)] (MT), Grants-in-Aid for Scientific Research [Grant No. JP20K14478] (YY). This work is also supported by the RCNP Collaboration Research Network program as the project number COREnet-2022 (project 34) by (ST).‘
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Takeuchi, S., Takizawa, M., Yamaguchi, Y. et al. The Impact of Quark Many-Body Effects on Exotic Hadrons. Few-Body Syst 65, 62 (2024). https://doi.org/10.1007/s00601-024-01932-2
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DOI: https://doi.org/10.1007/s00601-024-01932-2