# Scale setting for QCD with Nf=3+1 dynamical quarks

## TL;DR

This paper introduces a new method for setting the scale in lattice QCD simulations with 3+1 dynamical quarks, using a non-perturbative renormalization scheme and flow scale measurements to connect simulation parameters to physical units.

## Contribution

It presents the first scale setting results for Nf=3+1 QCD using a novel massive renormalization scheme and flow scale t0, including a charmonium spectrum analysis.

## Key findings

- Flow scale t0 measured at different volumes
- Charmonium spectrum obtained from simulations
- Non-perturbative determination of the clover coefficient

## Abstract

We present first results of the scale setting for QCD with Nf=3+1 dynamical quarks on the lattice. We use a recently proposed massive renormalization scheme with a non-perturbatively determined clover coefficient. To relate the bare coupling of the simulations to a lattice spacing in fm, we measure the flow scale t0 in lattice units at a mass point with degenerate light quark masses and a physical charm quark mass, where its value in physical units is known. We discuss the setup, tuning procedure, simulation parameters and measurement results for ensembles with three different volumes and present a charmonium spectrum.