Gluonic contribution to $B\to {\eta }^{(\prime )}$ form factors

Yeo-Yie Charng, T. Kurimoto, Hsiang-nan Li

We calculate the flavor-singlet contribution to the $B\to {\eta }^{(\prime )}$ transition form factors from the gluonic content of the ${\eta }^{(\prime )}$ meson in the large-recoil region using…