Prospects for $B_c^{+}$ and $B^{+}\to \ddot{I}{„}^{+}\hat{I}{½}_{\ddot{I}}„$ 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 $B_c^{+}\to \ddot{I}{„}^{+}\hat{I}{½}_{\ddot{I}}„$ and $B^{+}\to \ddot{I}{„}^{+}\hat{I}{½}_{\ddot{I}}„$ decays at the Future Circular Co…