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  • Letter
  • Open Access

Quark confinement for multiquark systems: Application to fully charmed tetraquarks

Guang-Juan Wang1,2,*, Makoto Oka3,2,†, and Daisuke Jido4,‡

  • 1KEK Theory Center, Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
  • 2Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • 3Nishina Center for Accelerator-Based Science, RIKEN, Wako 351-0198, Japan
  • 4Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan

  • *wgj@post.kek.jp
  • †makoto.oka@riken.jp
  • ‡jido@th.phys.titech.ac.jp
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Phys. Rev. D 108, L071501 – Published 3 October, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L071501

Abstract

A new color basis system and confinement mechanism for multiquark systems are proposed according to the string-type picture of QCD. The color string configurations in the strong coupling QCD are implemented in the set of color basis states. The extended color Hilbert space for QQQ¯Q¯ systems includes a “hidden color” state, which mixes with two-meson states QQ¯+QQ¯, This mixing effect leads to an attractive potential sufficient to form a bound state. We apply a realistic Hamiltonian model with the new scheme to fully charmed tetraquark states, ccc¯c¯, and find a bound and two resonant states, which could potentially correspond to the ccc¯c¯ tetraquark candidates recently observed in experiments.

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Phys. Rev. D 108, L071501– Published 3 October, 2023
  • Received 19 July 2023
  • Accepted 11 September 2023
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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