Setting the scale for nHYP fermions with the Lüscher-Weisz gauge action

Niyazi, Hossein; Alexandru, Andrei; Lee, Frank X.; Brett, Ruairí

doi:10.1103/physrevd.102.094506

Title: Setting the scale for nHYP fermions with the Lüscher-Weisz gauge action

Journal Article · 09 November 2020 · Physical Review. D.

DOI: https://doi.org/10.1103/physrevd.102.094506 · OSTI ID:1708938

^[1]; Alexandru, Andrei ^[2]; Lee, Frank X. ^[1];

^[1]

George Washington Univ., Washington, DC (United States)
George Washington Univ., Washington, DC (United States); Univ. of Maryland, College Park, MD (United States)

Lattice QCD calculations using gauge smearing for fermion kernels are computationally efficient. Hypercubic blocking (nHYP smearing) has been shown to reduce scaling errors. In this work we use an improved action for N_f= 2 QCD, based on the Lüscher-Weisz gauge action and clover-improved Wilson fermions with nHYP smeared gauge links. We perform a parameter scan in the region with lattice spacing between 0.066 fm and 0.115 fm and pion mass between 207 MeV and 834 MeV. We determine the lattice spacing and pion mass as a function of the bare coupling parameters (β and κ). The results are obtained from 22 ensembles on a 24³ × 48 lattice to the percent level in statistical accuracy. The finite-volume effects for these ensembles are at the subpercent level. From these measurements we produce easy-to-use parametrizations to help tune simulations with this action. The lattice spacing is fixed using a mass-independent procedure, by matching observables in the chiral limit. We also provide a parametrization for the chiral extrapolation which is universal and should hold for all discretizations of N_f = 2 QCD.

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Research Organization:: George Washington Univ., Washington, DC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)

Grant/Contract Number:: FG02-95ER40907; JSA-20-C0031

OSTI ID:: 1708938

Alternate ID(s):: OSTI ID: 1850090

Journal Information:: Physical Review. D., Vol. 102, Issue 9; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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