Study of intermediate states in the inclusive semileptonic $B rightarrow X_c l u$ decay structure function

We analyze the inclusive semileptonic $B to X_c ell u$ structure functions in 2+1-flavor lattice QCD. The Mobius domain-wall fermion action is used for light, strange, charm and bottom quarks. The structure function receives contributions from various exclusive modes, including the dominant S-wave states $D^{(*)}_s$ as well as the P-wave states $D_s^{**}$. We can identify them in the lattice data, from which we put some constraints on the $B_s to D_s^{**}ell u$ form factors.