First evidence for $B_s^0 \to \mu\mu$: theoretical overview and experimental result

In the first part, Gino Isidori will review the theoretical interest of $B_s \to \mu\mu$, both within and beyond the SM, discussing in particular the uncertainties affecting the SM prediction. Then Xabier Cid Vidal will explain the search for $B_s \to \mu\mu$ using 2.1 fb$^{-1}$ of LHCb data, leading to a 3.5 $\sigma$ evidence. He will describe the experimental challenges of this channel and summarize the techniques employed.