Strange quarks in quenched twisted mass lattice QCD

TL;DR

This paper investigates the properties of strange quarks in quenched twisted mass lattice QCD, analyzing meson masses and decay constants, and comparing twisted and untwisted strange quark formulations to understand discretization and quenching effects.

Contribution

It introduces a study of strange quarks using twisted mass lattice QCD with quenched simulations, including chiral perturbation theory and comparison to untwisted cases.

Findings

Computed pseudoscalar meson masses and decay constants.

Analyzed effects of quenching, discretization, and twist definition.

Compared twisted and untwisted strange quark formulations.

Abstract

Two twisted doublets, one containing the up and down quarks and the other containing the strange quark with an SU(2)-flavor partner, are used for studies in the meson sector. The relevant chiral perturbation theory is presented, and quenched QCD simulations (where the partner of the strange quark is not active) are performed. Pseudoscalar meson masses and decay constants are computed; the vector and scalar mesons are also discussed. A comparison is made to the case of an untwisted strange quark, and some effects due to quenching, discretization, and the definition of maximal twist are explored.