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

TL;DR

This study computes charm and strange hadron spectra using overlap fermions on HISQ gauge configurations, providing precise measurements of hyperfine splittings and decay constant ratios across two lattice spacings.

Contribution

It introduces a mixed action approach with overlap fermions on HISQ configurations, offering new precise lattice QCD results for charm and strange hadron properties.

Findings

Hyperfine splitting of 1S charmonia around 110 MeV.

Omega_ccc to J/Ψ mass ratio consistent across lattice spacings.

Ratio of leptonic decay constants f_Ds*/f_Ds measured.

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 (m(Omega_ccc)-3/2 m(J\Psi)) 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 f_Ds*/f_Ds.