Strange quark mass and Lambda parameter by the ALPHA collaboration

TL;DR

This paper uses lattice QCD simulations with improved Wilson fermions to accurately determine the strange quark mass and the Lambda parameter, crucial for understanding strong interactions.

Contribution

It introduces a non-perturbative approach to compute the RGI strange quark mass and Lambda parameter using two strategies for chiral extrapolation in lattice QCD.

Findings

Determined f_K for two-flavor lattice QCD

Calculated RGI strange quark mass

Estimated Lambda parameter in units of f_K

Abstract

We determine f_K for lattice QCD in the two flavor approximation with non-perturbatively improved Wilson fermions. The result is used to set the scale for dimensionful quantities in CLS/ALPHA simulations. To control its dependence on the light quark mass, two different strategies for the chiral extrapolation are applied. Combining f_K and the bare strange quark mass with non-perturbative renormalization factors and step scaling functions computed in the Schroedinger Functional, we determine the RGI strange quark mass and the Lambda parameter in units of f_K.