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  • Letter
  • Open Access

Discovery of the doubly charmed Tcc+ state implies a triply charmed Hccc hexaquark state

Tian-Wei Wu1,2, Ya-Wen Pan1, Ming-Zhu Liu3,1, Si-Qiang Luo4, Li-Sheng Geng1,5,6,7,*, and Xiang Liu4,8,7,†

  • 1School of Physics, Beihang University, Beijing 102206, China
  • 2School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China
  • 3School of Space and Environment, Beihang University, Beijing 102206, China
  • 4School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
  • 5Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, Beijing 102206, China
  • 6School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, Henan 450001, China
  • 7Lanzhou Center for Theoretical Physics, Lanzhou University, Lanzhou, Gansu 730000, China
  • 8Research Center for Hadron and CSR Physics, Lanzhou University and Institute of Modern Physics of CAS, Lanzhou 730000, China

  • *lisheng.geng@buaa.edu.cn
  • †xiangliu@lzu.edu.cn
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Phys. Rev. D 105, L031505 – Published 18 February, 2022

DOI: https://doi.org/10.1103/PhysRevD.105.L031505

Abstract

The doubly charmed exotic state Tcc recently discovered by the LHCb Collaboration could well be a DD* molecular state long predicted in various theoretical models, in particular, the DD* isoscalar axial vector molecular state predicted in the one-boson-exchange model. In this work, we study the DDD* system in the Gaussian expansion method with the DD* interaction derived from the one-boson-exchange model and constrained by the precise binding energy of 273±63  keV of Tcc with respect to the D*+D0 threshold. We show the existence of a DDD* state with a binding energy of a few hundred keV, isospin 1/2, and spin-parity 1−. Its main decay modes are DDDπ and DDDγ. The existence of such a state could in principle be confirmed with the upcoming LHC data and will unambiguously determine the nature of the Tcc+ state and of the many exotic states of similar kind, thus deepening our understanding of the nonperturbative strong interaction.

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Phys. Rev. D 105, L031505– Published 18 February, 2022
  • Received 5 August 2021
  • Accepted 9 February 2022
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