Lattice calculations of Ds to eta and eta' decay form factors

TL;DR

This paper presents lattice QCD calculations of the decay form factors for D_s meson decays to eta and eta', highlighting the importance of disconnected diagrams in the results.

Contribution

First lattice QCD study including disconnected diagrams for D_s to eta and eta' decay form factors with n_f=2+1 configurations.

Findings

Disconnected diagrams significantly affect the form factors.

Lattice results provide insights into semi-leptonic decay dynamics.

Methodology advances in handling disconnected fermion loops.

Abstract

We report on lattice results of the form factors for semi-leptonic decays of the D_s meson to eta and eta', with n_f=2+1 configurations. The calculation contains disconnected fermion loop diagrams, which are challenging to calculate on the lattice. Our result shows that the disconnected diagrams give significant contributions to the form factors.