Heavy hadron spectrum from 2+1+1 flavor MILC lattices

We study the mass spectra and various mass differences of heavy hadrons containing one or more bottom quarks using MILC’s $N_f=2+1+1$ HISQ gauge ensembles at three lattice spacings. For the valence quarks, we employ a combination of lattice actions: the NRQCD action is used for bottom quarks, the anisotropic Clover action for charm quarks, and the $O(a)$-improved Wilson–Clover action for strange and lighter (up/down) quarks. Heavy hadron operators with at least one bottom quark are constructed by considering all possible combinations with charm, strange, and light quarks corresponding to various quantum numbers.