Electro–Weak Penguin and Leptonic Decays in BaBar

Electro–weak penguin and leptonic decays provide an indirect probe for physics beyond the Standard Model and contribute to the determination of Standard Model parameters. Copious quantities of B mesons produced at the B–Factories permit precision measurements of the electro–weak penguin decays and searches for leptonic decays. We review the current experimental status of b→s(d)γ, b→sℓ+ℓ− and finally B+→τ+ντ decays at BaBar.