Speaker
Prof.
Wolfgang Gradl
(Universität Mainz)
Description
Flavour-changing neutral currents, such as $B \to K^{(*)} \ell^+\ell^-$ or $B \to X_s \gamma$, are forbidden at tree level in the Standard Model. At lowest order, they occur at 1-loop level, making them sensitive to quantum corrections from particles beyond the Standard Model (SM). Via these virtual contributions, one can probe mass scales which are currently inaccessible in direct production.
In this talk, we present the most recent results from BABAR, using 471 million $B\bar{B}$ pairs, on the decays $B \to K^* \ell^+\ell^-$. The quantities $A_{FB}$ and $F_L$, which are sensitive to the presence of particles beyond the SM in the loops, are determined using an angular analysis. We also report on a search for the decay $B \to K \tau^+ \tau^-$.
Primary author
Prof.
Wolfgang Gradl
(Universität Mainz)
