Charm and strange hadron spectra from overlap fermions on HISQ gauge configurations

Abstract

We report here results on charm and strange hadron spectra. Adopting a mixed action approach, we use overlap fermions for valence quarks, on a background of 2+1+1 flavours HISQ gauge configurations of MILC collaboration. Two lattice spacings (0.09 fm and 0.06 fm) are used. We find the hyperfine splitting of 1S charmonia to be 114+3 −2 MeV and 109+4 −3 MeV, and the splitting (mΩccc − 3 2mJ/Ψ) is found to be 110+20 −10 MeV and 120(10) MeV, corresponding to lattices with spacings a = 0.09 and 0.06 fm respectively. We also look at the ratio of the leptonic decay constant fD∗ s / fDs .