Lattice study on a tetra-quark state $T_{bb}$ in the HAL QCD method

Takafumi Aoki, Sinya Aoki, Takashi Inoue

We study a doubly-bottomed tetra-quark state $(bb\bar{u}\bar{d})$ with quantum number $I(J^P)=0(1^{+})$, denoted by $T_{bb}$, in lattice QCD with the Non-Relativistic QCD (NRQCD) qua…