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. 2021 Aug 13;127(7):072003.
doi: 10.1103/PhysRevLett.127.072003.

Dibaryon with Highest Charm Number near Unitarity from Lattice QCD

Yan Lyu  1   2 , Hui Tong  1   3 , Takuya Sugiura  3 , Sinya Aoki  2   4 , Takumi Doi  2   3 , Tetsuo Hatsuda  3 , Jie Meng  1   5 , Takaya Miyamoto  2
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Dibaryon with Highest Charm Number near Unitarity from Lattice QCD

Yan Lyu et al. Phys Rev Lett. .
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Abstract

A pair of triply charmed baryons, Ω_{ccc}Ω_{ccc}, is studied as an ideal dibaryon system by (2+1)-flavor lattice QCD with nearly physical light-quark masses and the relativistic heavy-quark action with the physical charm quark mass. The spatial baryon-baryon correlation is related to their scattering parameters on the basis of the HAL QCD method. The Ω_{ccc}Ω_{ccc} in the ^{1}S_{0} channel, taking into account the Coulomb repulsion with the charge form factor of Ω_{ccc}, leads to the scattering length a_{0}^{C}≃-19 fm and the effective range r_{eff}^{C}≃0.45 fm. The ratio r_{eff}^{C}/a_{0}^{C}≃-0.024, whose magnitude is considerably smaller than that of the dineutron (-0.149), indicates that Ω_{ccc}Ω_{ccc} is located in the unitary regime.

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