Lyu Yan, Tong Hui, Sugiura Takuya, Aoki Sinya, Doi Takumi, Hatsuda Tetsuo, Meng Jie, Miyamoto Takaya
State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China.
Quantum Hadron Physics Laboratory, RIKEN Nishina Center, Wako 351-0198, Japan.
Phys Rev Lett. 2021 Aug 13;127(7):072003. doi: 10.1103/PhysRevLett.127.072003.
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.
利用具有接近物理轻夸克质量的（2 + 1）味格点量子色动力学以及具有物理粲夸克质量的相对论重夸克作用，对一对三重粲重子Ω₍ccc₎Ω₍ccc₎作为理想的双重子系统进行了研究。基于HAL QCD方法，空间重子 - 重子关联与其散射参数相关。考虑到Ω₍ccc₎的电荷形状因子的库仑排斥，处于¹S₀通道的Ω₍ccc₎Ω₍ccc₎导致散射长度a₀⁽C⁾≃ - 19 fm以及有效范围rₑff⁽C⁾≃ 0.45 fm。有效范围与散射长度的比值rₑff⁽C⁾/a₀⁽C⁾≃ - 0.024，其大小远小于双中子的比值（-0.149），表明Ω₍ccc₎Ω₍ccc₎处于幺正区域。
