Beauty mesons in Nf=2+1+1+1 lattice QCD with exact chiral symmetry

We present the first study of Nf=2+1+1+1 lattice QCD with domain-wall quarks. The (b, c, s) quarks are physical, while the (u, d) quarks are heavier than their physical masses, with the pion mass ?700 MeV. The gauge ensemble is generated by hybrid Monte Carlo simulation with the Wilson gauge action for the gluons, and the optimal domain-wall fermion action for the quarks. Using point-to-point quark propagators, we measure the time-correlation functions of quark-antiquark meson interpolators with quark contents b¯b, b¯c, b¯s, and c¯c, and obtain the masses of the low-lying mesons. They are in good agreement with the experimental values, plus some predictions which have not been observed in experiments. Moreover, we also determine the masses of (b, c, s) quarks. ? 2020 authors. Published by the American Physical Society.