Prospects for $B_c^{+}$ and $B^{+}\to {\tau }^{+}{\nu }_{\tau }$ at FCC-ee

Marco Fedele, Clément Helsens, Donal Hill +3

The prospects are presented for precise measurements of the branching ratios of the purely leptonic $B_c^{+}\to {\tau }^{+}{\nu }_{\tau }$ and $B^{+}\to {\tau }^{+}{\nu }_{\tau }$ decays at the Future Circular Collider…