Soft-overlap contribution to $B_c\to {\eta }_c$ form factors: diagrammatic resummation of double logarithms

Guido Bell, Philipp Böer, Thorsten Feldmann +2

Using diagrammatic resummation techniques, we investigate the double-logarithmic series of the "soft-overlap" contribution to $B_c\to {\eta }_c$ transition form factors at large hadroni…