Impact of Dynamical Charm Quark and Mixed Action Effect on Light Hadron Masses and Decay Constants

Abstract

We investigate the impact of including a dynamical charm quark on the properties of light hadrons. Our study compares the calculations performed on 2+1+1 flavor (HISQ fermion) ensembles at four lattice spacings to those on 2+1 flavor (clover fermion) ensembles at six lattice spacings, with both sets of ensembles employing the identical Symanzik gauge action. For the light, strange and charm flavor observables, we employ the same tadpole-improved clover fermion action. From numerical results for light and strange quark masses, pion and kaon decay constants, and $\Omega$ and ${\Omega }_{ccc}$ baryon masses, we find that the values obtained after continuum, chiral, and infinite-volume extrapolations are consistent within uncertainties. Even though the mixed action setup can introduce additional discretization effects, our calculation shows evidences that those effects can cancel with the discretization error in the unitary setup, resulting in better convergence in the continuum extrapolation.

14 pages, 7 figures, v2: version published in Communications in Theoretical Physics

References in corpus (18)

• FLAG Review 2021
• Ab initio calculation of the neutron-proton mass difference
• High Precision determination of the pi, K, D and D_s decay constants from lattice QCD
• Continuum Limit Physics from 2+1 Flavor Domain Wall QCD
• High-precision quark masses and QCD coupling from $n_f=4$ lattice QCD
• Lattice QCD at the physical point: light quark masses
• Charmed and light pseudoscalar meson decay constants from four-flavor lattice QCD with physical light quarks
• Leptonic decay constants fK, fD and fDs with Nf = 2+1+1 twisted-mass lattice QCD
• Electromagnetic form factor of the pion from twisted-mass lattice QCD at Nf=2
• FLAG Review 2024
• The ratio FK/Fpi in QCD
• $F_K/F_{\pi }$ from Möbius domain-wall fermions solved on gradient-flowed HISQ ensembles
• Spectral density of the Dirac operator in two-flavour QCD
• Flavour breaking effects in the pseudoscalar meson decay constants
• Light quark masses in N_f = 2+1 lattice QCD with Wilson fermions
• Hybrid calculation of hadronic vacuum polarization in muon g-2 to 0.48\%
• Distance between various discretized fermion actions
• Five loop anomalous dimension of non-singlet quark currents in the RI' scheme