Effective theory approach to new physics in $b\to u$ and $b\to c$ leptonic and semileptonic decays

Rupak Dutta, Anupama Bhol, Anjan K Giri

Recent measurements of exclusive $B^{-}\to {\tau }^{-}\nu$ and $B^0\to {\pi }^{+}{l}^{-}{\bar{\nu }}_l$ decays via the $b\to ul\nu$ transition process differ from the standard model expectati…