Search for new physics in $B_s\to {\mu }^{+}{\mu }^{-}$ and $B\to K^{(\ast )}{\mu }^{+}{\mu }^{-}$

Nicola Serra

Transitions of the type $b\to s{l}^{+}{l}^{-}$ are flavour changing neutral current processes where new physics can enter in competing loop diagrams with respect to the Standard Model c…