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We construct $bb\bar{u}\bar{d}$ states on lattice using NRQCD action forbottom and HISQ action for the light up/down quarks. The NRQCD-HISQ tetraquarkoperators are constructed for "bound" $[bb][\bar{u}\bar{d}]$ and "molecular"$[b\bar{u}] [b\bar{d}]$ states. Corresponding to these different operators, twodifferent appropriately tuned light quark masses are needed to obtain thedesired spectra. We explain this requirement of different $m_{u/d}$ in thelight of relativised quark model involving Hartree-Fock calculation. The massspectra of double bottom tetraquark states are obtained on MILC $N_f=2+1$Asqtad lattices at three different lattice spacings. Variational analysis hasbeen carried out to obtain the relative contribution of "bound" and "molecular"states to the energy eigenstates.

Construction of $bb\bar{u}\bar{d}$ tetraquark states on lattice with NRQCD bottom and HISQ up/down quarks