Supersymmetric effects in rare semileptonic decays of B and K mesons

Abstract

Rare flavour-changing neutral-current transitions of the type $s\to d{\ell }^{+}{\ell }^{-}(\nu \bar{\nu })$ and $b\to s{\ell }^{+}{\ell }^{-}(\nu \bar{\nu })$ are analysed in supersymmetric extensions of the Standard Model with generic flavour couplings. It is shown that these processes are particularly sensitive to the left--right mixing of the squarks and that, in the presence of non-universal $A$ terms, they could lead to unambiguous signatures of new physics in exclusive $K$ and $B$ meson decays.

Comments: 15 pages, Latex, invited talk at RADCOR 2000 (Carmel CA, USA, Sept. 2000)