Lattice calculation of $D_s$ to ${\eta }^{(\prime )}$ semi-leptonic decay form factors

Abstract

We report lattice results of $D_s$ meson semi-leptonic decay form factors to $\eta$ and ${\eta }^{\prime }$ mesons. This decay process contains disconnected fermion loops, which are challenging in lattice calculations. Our result shows that the disconnected loops give significant contributions to the form factors.

Comments: 1+6 pages, to appear in the proceedings of The 6th International Workshop on Charm Physics (CHARM 2013)